Thorlabs Inc.
Visit the 225 W TEC Controller page for pricing and availability information

225 W TEC Controller

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Item #TED4015
Temperature Stability0.002 °C (24 hrs)
TEC Output±15 A
Compliance Voltage>15 V
Temperature Control Range-55 to 150 °C
Resistance Measurement Range
(2 Ranges)
100 Ω to 100 kΩ or
1kΩ to 1MΩ
Temperature Resolution0.001 °C
(0.1 Ω/1 Ω for Thermistors)


  • Precise Temperature Stabilization of Laser Diodes for Interferometry and Spectroscopy
  • Control Temperature Set Point via External Input (Active Laser Wavelength Stabilization)
  • Cooling of Detectors for Noise Reduction
  • Temperature Stabilization of Nonlinear Crystals
  • Temperature Stabilization of Industrial Systems


  • Excellent Temperature Stability: 0.002 °C (24 hrs)
  • Digital PID Control with Separate P, I, and D Settings
  • Automatic PID Setting Function
  • Temperature Display in °C, °F, K
  • Adjustable Temperature Sensor Offset
  • Active Power Management for Efficient Power Use
  • Compatible Sensors:
    • NTC Thermistors
    • Current Temperature Sensors
    • Voltage Temperature Sensors
    • Platinum RTD Temperature Sensors
  • Control Modes:
    • Constant Temperature
    • Constant Current
  • Enhanced Security Features:
    • Adjustable TEC Current Limit
    • Adjustable Temperature Limits
    • Temperature Window Protection
    • Sensor Fault Protection
  • Interface and Drivers:
    • USB Interface (SCPI Compliant)
    • VXIpnp/VISA Drivers for Common Programming Environments like LabWindows/CVI™, LabVIEW™, and MS Visual Studio™

The TED4015 is a high-performance digital temperature controller designed to drive thermoelectric cooler (TEC) elements with currents up to ±15 A. It supports most common temperature sensors and can be adapted to different thermal loads. The TED4015 can be fully controlled via its robust, SCPI-compatible USB interface. The digital PID control offers an auto PID setting function or separate control of the P, I, and D parameters. The TED4015 boasts excellent temperature stability of 0.002 °C within 24 hrs, enhanced safeguard features, and error indicators, making this device ideal for cooling very sensitive devices where high stability, reliability, and precision is required.

Compared to our TED200C Temperature Controller, the TED4015 offers a wider TEC current range plus additional features like full digital control, easy auto PID setting, constant TEC current mode, set temperature protection, TEC voltage measurement, and adjustable temperature window protection. The TED4015 also offers silent operation.

Adaptability to Different Thermal Loads

The TED4015 can easily be adapted to different thermal loads by a digital PID loop. The P (proportional) gain, the I (integral) offset control, and the D (derivative or differential) rates can be individually adjusted by the user or by the auto PID function. With optimum PID parameters, the settling time for a temperature change of 1 °C for a laser mounted in our LM14S2 Laser Diode Mount is less than 2 seconds.

Supported Temperature Sensors

The TED4015 temperature controller supports almost all common temperature sensors. A sensor selection in the Temperature Control Menu allows the use of thermistors up to 1000 kΩ, the use of a temperature sensing IC (such as the AD590) or the use of platinum RTD sensors. The temperature can be displayed in Celsius, Fahrenheit or Kelvin. For thermistors, two temperature calculation methods can be selected: Steinhart-Hart or exponential. The maximum control range is -55 to 150 °C, limited by the rated temperature range of the connected sensor and thermal setup.

Enhanced Security Features

The TED4015 is designed for maximum TEC element protection and stable as well as reliable operation. An adjustable TEC output current limit prevents the controller from overdriving the TEC element. This limit can be set from 0.1 A to the current range of the controller. Adjustable temperature limits and the temperature window protection provide alerts if the temperature of the TEC element exceed certain values.

The system indicates the presence of an incorrect or missing temperature sensor and a bad connection between sensor and controller by an LED on the TEC "On" key and an audible warning signal. The TEC current is automatically switched off if an error occurs.

Temperature Monitor Output

The TED4015 provides a monitoring signal proportional to the difference between actual and set temperature. An oscilloscope or an analog data acquisition card can be connected directly to the rear panel BNC connector to monitor the settling behavior with different thermal loads.

Companion Products

Our LDC200C Laser Diode Controllers are ideal companions for the TED4015. When combined with our TEC laser mounts, the TED4015 can achieve a thermal stability of 0.001 °C. This temperature stability is required for applications like laser diode wavelength tuning and atomic absorption cell spectroscopy.

The TED4015 Ships with the Following Parts:

  • Laser Mount Cable for TED4015: 5 A, 17W2, D-Sub-9 (Item Number CAB4000, Also Sold Below)
  • DB-9 Connectors: 17W2, Male and Female, with Two High-Current 20 A Contacts (Item Number CON4001, Also Sold Below)
  • USB Cable A-B, 2 m
  • Driver CD
  • Certificate of Calibration
  • Operating Manual
Hide Specs


Item #TED4015
 Front PanelaRemote Controla
TEC Current Output
Control Range-15 A to +15 A
Compliance Voltage>15 V
Maximum Output Power>225 W
Resolution (Constant Current Mode)1 mA0.1 mA
Accuracy±(0.2% + 20 mA)
Noise and Ripple (Typical)<10 mA rms
TEC Current Limit
Setting Range0.1 A to 15 A
Resolution1 mA0.1 mA
Accuracy±(0.2% + 10 mA)
NTC Thermistor Sensors
Resistance Measurement Ranges100 Ω to 100 kΩ / 1 kΩ to 1 MΩ
Control Range (Max)b-55 to 150 °C
Resolution (Temperature)0.001 °C
Resolution (Resistance, 100 kΩ/1 MΩ Range)0.1 Ω / 1 Ω0.03 Ω / 0.3 Ω
Accuracy (100 kΩ/1 MΩ Range)±(0.06% + 1 Ω / 5 Ω)
Temperature Stability 24 hours (Typical)b<0.002 °C
Temperture Coefficient<5 mK/°C
IC Sensors
Supported Current Temperature SensorsAD590, AD592
Supported Voltage Temperature SensorsLM335, LM235, LM135, LM35
    Control Range with AD590-55 to 150 °C
    Control Range with AD592-25 to 105 °C
    Control Range with LM335-40 to 100 °C
    Control Range with LM235-40 to 125 °C
    Control Range with LM135-55 to 150 °C
    Control Range with LM35-55 to 150 °C
Resolution0.001 °C0.0001 °C
Accuracy AD590 Current± (0.04% + 0.08 µA)
Accuracy LM335/LM35 Voltage± (0.03% + 1.5 mV)
Temperature Stability 24 hours<0.002 °C
Temperature Coefficient<5 mK/°C
PT100/PT1000 RTD Sensors
Temperature Control Range-55 to 150 °C
Resolution0.001 °C0.0003 °C
Accuracy PT100/PT1000 (4-Wire Measurement)±0.3 °C/±0.1 °C
Temperature Stability 24 hours<0.005 °C
Temperture Coefficient<20 mK/°C
Temperature Window Protection
Setting Range Twin0.01 to 100.0 °C
Protection Reset Delay0 to 600 sec
Window Protection OutputBNC, TTL
Temperature Control Output
Load Resistance>10 kΩ
Transmission CoefficientΔT x 5 V / Twin ± 0.2 % (Temperature Deviation, Scaled to Temperature Window)
TEC Voltage Measurement
Measurement Principle4-Wire / 2-Wire
Resolution100 mV40 mV
Accuracy (with 4-wire Measurement)±50 mV
Digital I/O Port
Number of I/O Lines4 (Separately Configurable)
Input LevelTTL, Voltage Tolerant up to 24 V
Output Level (Source Operation)TTL, Max 2 mA
Output Level (Sink Operation)Open Collector, up to 24 V, Max 400 mA
USB 2.0According USBTMC/USBTMC-USB488 Specification Rev. 1.0
ProtocolSCPI-Compliant Command Set
DriversVISA VXIpnp™, MS Visual Studio™, MS Visual™, NI LabView™, NI Labwindos/CVI™
General Data
Safety FeaturesTEC Current Limit, Sensor Fault Protection, Short Circuit when TEC Off, Open Circuit Protection, Temperature Setpoint Limit, Window Protection, Over Temperature Protection
DisplayLCD 320 x 240 pixels
Connector for Sensor, TE Cooler, TEC On Signal17W2 Mixed D-sub Jack (female)
Connectors for Deviation Out / Window Protection OutBNC
Connector for Digital I/OMini DIN 6
Connector for USB InterfaceUSB Type B
Chassis Ground Connector4 mm Banana Jack
Line Voltage / Frequency100 to120 V and 200 to 240 V ± 10%, 50 to 60 Hz
Maximum Power Consumption600 VA
Mains Supply OvervoltageCategory II (Cat II)
Operating Temperature0 to 40 °C
Storage Temperature-40 to 70 °C
Relative HumidityMax. 80% Up to 31 °C, Decreasing to 50% at 40 °C
Pollution Degree (Indoor Use Only)2
Operation Altitude<2000 m
Warm-Up Time for Rated Accuracy30 min
Weight5.3 kg
Dimensions (W x H x D) w/o Operating Elements263 mm x 122 mm x 307 mm
Dimensions (W x H x D) with Operating Elements263 mm x 122 mm x 345 mm
  • Via front panel the resolution is limited by the display. Via Remote Control a higher resolution is offered.
  • Control range and thermal stability depend on thermistor parameters.

All technical data valid at 23 ± 5 °C and 45 ± 15% relative humidity

Hide Front & Back Panel


TED4015 Front Panel

1Supply Power Switch4Escape Key
2LC Display5TEC Status Indicator
3Softkeys for Menu Navigation6Adjustment Knob

TED4015 Back Panel

1Actual Temperature Deviation Output "Deviation Out" -5 to 5 V6USB Connector
2TTL Temperature Monitor Output
"Temp OK Out" 5 V
74 mm Banana Jack for Chassis Ground
3Serial Number of the Unit8MiniDin-6 Jack "Digital I/O"
4Cooling Fan
5TEC Element Output and Temperature Sensor Input "TEC Output"9Power Connector and Fuse Holder "Line In"
Hide Pin Diagrams


TEC Output

17W2 Mixed D-Sub Jack

Pin Configuration

1Interlock, TEC ON LED (+)10PT100/1000 (-), AD590/592 (-), LM35 Out, LM135/235/335 (+)
2Voltage Measurement TEC Element (+)11PT100/1000 (+), AD590/592 (+), LM35/135/235/335 (+)
3Thermistor (-), PT100/1000 (-), Analog Ground12Analog Ground, LM35/135/235/335 (-)
4Thermistor (+), PT100/1000 (+)13Not Connected
5Analog Ground, LM35/135/235/335 (-)14I/O 1-wire (Currently Not Used)
6Digital Ground for I/O 1-wire15Ground for 12 V Output and Interlock, TEC ON LED (-)
712 V Output (for External Fan, max. current = 500 mA)S1TEC Element (+) (Peltier Element)
8Not ConnectedS2TEC Element (-)(Peltier Element)
9Voltage Measurement TEC Element (-)

Digital I/O Ports

Digital I/O

1I/O 1
2I/O 2
3I/O 3
4I/O 4
6I/O Supply Voltage (+12 V from internal or higher external voltage up to +24 V)

Deviation Out

BNC Female

BNC Female

Actual temperature deviation output, -5 ... +5 V

Temp OK Out

BNC Female

BNC Female

Temperature OK output (high if inside temperature window), TTL 5 V

Computer Connection

USB Type B

USB Type B

USB Type B to Type A Cable Included



Banana Plug


4 mm banana jack for chassis ground


CAB4000 TEC Element Cable

This cable contains a DB-9 female connector on one side and a 17W2 male connector on the other side. Both views shown below are looking into the connector.

Female DB-9 Pin Diagram
DB-9 Female Connector
Male 17W2 Pin Diagram
17W2 Male Connector
Pin Matching
DB-9 Pin17W2 Pin(s)
11, 15
42, S1
59, S2
6No Connection
85, 12
DB-9 Connector Colors
2Pink and Gray
3Red and Blue
4Pink, Red, and Purple
5Black, Gray, and Blue
6No Connection
17W2 Connector Colors
3Red and Blue12Brown
4Pink and Gray13No Connection
5Brown14No Connection
6No Connection15White
7No ConnectionS1Purple and Pink
8No ConnectionS2Black and Gray
Hide Display Screens


Sample Screens of the TED4000

Measurement ScreenMenu Screen
 Measurement ScreenThe top of this screen shows the Temperature Setpoint: temperature in Constant Temperature Mode and current in Constant Current Mode. At the bottom the actual measured value is shown. The units depend on the attached sensor. Peltier Current, Peltier Voltage and Peltier Power can be shown as well. A status line shows warnings and error-messages. Menu ScreenThe menu screen allows selecting different operation modes and options.
Temperature Controller ScreenTemperature Mode Settings Screen
 Temperature Controller ScreenVia the Temperature Controller Screen all parameters for the temperature controller are entered: Operation Mode, Current Limit, Current Control Mode Settings, Temperature Sensor Settings. Temperature Mode Settings ScreenThis Screen offers access to the PID and Temperature Limit Settings.
PID Auto-Tune ScreenPreference Screen
 PID Auto-Tune ScreenVia this Screen the PID auto parameter function is started. The TED4000 selects optimal PID parameters for the current settings. Preference ScreenThis Screen offers access to the device preferences, i.e. operation and display modes.
Hide Software


Software for Laser Diode Controllers

The download button below links to VISA VXI pnp™, MS Visual Studio™, MS Visual™, LabVIEW™, and LabWindows/CVI™ drivers, firmware, utilities, and support documentation for Thorlabs' ITC4000 Series laser controllers, LDC4000 Series laser controllers, and the CLD1015, CLD1010LP, and CLD1011LP compact laser diode controllers.


Version 3.1.0 (April 11, 2014)

Software Download

The software packages support LabVIEW 8.5 and higher. If you are using an earlier version of LabVIEW, please contact Technical Support for assistance.

Hide Shipping List


The TED4015 ships with the following Parts:

xBenchtop Temperature Controller, ±15 A/225 W (TED4015)
xCable TED4000 to laser mount, 5 A, 17W2, D-Sub-9 (CAB4000)
xUSB Cable A-B, 2 m
xOperation Manual TED4015
xDistribution CD 4000 Series
xMixed D-Sub connector 17W2, male & female with 2 high current contacts each, 20 A (CON4001)
Hide Benchtop TEC Controller

Benchtop TEC Controller

Part Number
Benchtop TEC Controller, ±15 A / 225 W
Hide TEC Element Connector Cables

TEC Element Connector Cables

Item # CAB4000 CAB4001 CON4001
Click Image to Enlarge CAB4000 CAB4001 CON4001
Description Standard TEC Element Cable High Current TEC Element Cable 17W2 Male and Female
Connector Kit (One Each)
Max Current 5 A 20 A 20 A
Connector Type 17W2 Male to DB-9 Female 17W2 Male to 17W2 Male Loose 17W2 Connectors,
Male and Female

These cables connect our TED4015 temperature controller or our ITC4000 series dual current / temperature controllers to thermoelectric cooling elements. We also provide loose 17W2 connectors for customers who wish to make their own cables. For the pinout of the CAB4000 cable, please see the Pin Diagrams tab.

Please note that one CAB4000 cable and one CON4001 connector set are included with the purchase of a TED4015 benchtop controller.

Part Number
Connection Cable for TED4000/ITC4000, 17W2 to D-Sub-9, 5 A
Connection Cable for TED4000/ITC4000, 17W2 to 17W2, 20 A
Connector Kit, 17W2 Male & Female, 20 A
Hide TED4000 Series Calibration Service

TED4000 Series Calibration Service

Part Number
Recalibration Service for TED4000
Lead Time