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ESD Protection and Strain Relief Cables


  • Laser Socket and 3 Feet (0.91 Meters) of Shielded Cable
  • Threads into Our Laser Diode Collimation Mounts
  • Includes Clamping and Reverse Protection Diodes to Suppress ESD
  • Cables Support Forward Voltages up to 3.3 V or 7.5 V

SR9B-DB9

Pin Codes: B and H
DB9 Terminated

SR9A

Pin Codes: A and E
Bare Wire Termination

SR9 Cables are
Compatible with
Our Laser Diode
Collimation Mounts

Related Items


Please Wait
Item #
Prefixa
Supported
Pin Style
Max LD
Forward
Voltage
SR9A A and E 3.3 V
SR9B B and H
SR9C C and H
SR9D D
SR9F F and G
SR9HA A and E 7.5 V
SR9HB B and H
SR9HF F and G
  • Standard cables are terminated with bare wires. Cables with a -DB9 suffix in the item # are DB9 terminated.
Laser Diode Mount
Click to Enlarge

An SR9 Cable Threaded onto an LDH9-P2 30 mm Cage Collimation Mount
Laser Diode Mount
Click to Enlarge

Ø1/2" Post Mount with
TO-18 Diode Package and
Strain Relief Cable

Features

These strain relief and ESD protection products offer a convenient means of connecting a Ø5.6 mm or Ø9 mm laser diode to many of Thorlabs' laser diode controllers. Each model comes with a laser socket mounted to a small printed circuit board (PCB). The PCB contains a Schottky diode to clamp any reverse voltages that might appear across the laser diode, as well as a Zener diode to shunt any excessive voltages or ESD away from the diode.

Each model corresponds to one or more of the standard Pin Styles for laser diodes (see the diagram below) and is compatible with our Laser Diode Collimation and Focusing Tubes, Ø1/2" Post Mounts, and Cage Plate Mounts. SR9 models are designed for laser diodes with forward voltages up to 3.3 V, while SR9H models are designed for laser diodes with forward voltages up to 7.5 V. Each strain relief is available with or without a DB9 connector. Models with item #'s that end in -DB9 are pin compatible with many of our Laser Diode Controllers (see the strain relief cable and controller pin diagrams to determine compatibility), as well as with the MLDEVAL Evaluation Board for our OEM laser diode controllers. To connect fiber-pigtailed TO can laser diodes to a breadboard or Ø1/2" post, see our L-bracket Passive Fiber-Pigtailed Laser Diode Mount.

Note: These cables are not designed to provide any temperature regulation. More information on temperature regulating a laser diode is provided in the Laser Diode Tutorial.

Supported Laser Diode Pin Codes
Supported Pin Codes

Strain Relief Cable DB9 Connector Pin Configurations

D-type Male

DB9 Male
The following pin configurations are provided for strain relief cables that use a DB9 connector (Item #'s ending in -DB9) when used with the compatible style of laser diode. Each relief cable with bare wire leads has the same wire-color-to-laser-diode-pin configuration as its DB9-terminated counterpart.

Pin Configuration for SR9A-DB9, SR9D-DB9,
SR9F-DB9, SR9HA-DB9, and SR9HF-DB9
Pin Wire Color Connection
1 - Connected to Pin 5a
2 White Photodiode Cathode (PDK) /
Laser Diode Anode (LDA)
3
4 Red Photodiode Anode (PDA)
5 - Connected to Pin 1a
6 - -
7 Green Laser Diode Cathode (LDK)
8 - -
9 - -
  • Pins 1 and 5 are connected for compatibility with drivers that need the interlock to be grounded on one of these pins.
Pin Configuration for SR9B-DB9 and SR9HB-DB9
Pin Wire Color Connection
1 - Connected to Pin 5a
2 White Photodiode Cathode (PDK) /
Laser Diode Cathode (LDK)
3
4 Red Photodiode Anode (PDA)
5 - Connected to Pin 1a
6 - -
7 - -
8 Green Laser Diode Anode (LDA)
9 - -
  • Pins 1 and 5 are connected for compatibility with drivers that need the interlock to be grounded on one of these pins.
Pin Configuration for SR9C-DB9
Pin Wire Color Connection
1 - Connected to Pin 5a
2 Red Photodiode Cathode (PDK)
3 White Photodiode Anode (PDA) /
Laser Diode Cathode (LDK)
4
5 - Connected to Pin 1a
6 - -
7 - -
8 Green Laser Diode Anode (LDA)
9 - -
  • Pins 1 and 5 are connected for compatibility with drivers that need the interlock to be grounded on one of these pins.

Posted Comments:
vh257  (posted 2017-11-06 09:52:11.433)
It seems like there is an error in the documentation (the engineering drawings/schematics) for a substantial number of the -DB9 variants of these cables. The pin-out table in the top left lists the wrong colour wires for the laser anode and laser cathode. On the SR9HB-DB9 it reads "White - Photodiode Cathode (PDK) Laser Diode Anode (LDA" and "Green - Laser Diode Cathode (LDK)". These should be the other way around, when compared to the diode pins and physically following the connections through on the circuit board.
nbayconich  (posted 2017-11-20 09:42:10.0)
Thank you for you feedback. We are currently correcting the pin-outs in our strain relief cable schematics. Thank you for bringing this to our attention.
whath90  (posted 2016-11-15 14:16:05.94)
Could you let me know the maximum allowable current of SR9B-DB9 series or what the AWG number of wire is?
tfrisch  (posted 2016-11-28 02:50:56.0)
Hello, thank you for contacting Thorlabs. The current will most often be limited by the diode rather than mount. The socket and AWG of the wires in the mount would be able to handle at least 1A, but since there is no temperature control for the diode in these mounts, the thermal load of a diode with such high drive current would prohibit it from being used with these cables for its own stability and temperature requirements. I have contacted you directly with more information.
user  (posted 2016-02-03 10:26:56.363)
Can you customize the series for PL450B?
besembeson  (posted 2016-02-04 10:40:24.0)
Response from Bweh at Thorlabs USA: We have the SR9HF or the SR9HF-DB9 with 7.5V forward voltage that should be suitable for the PL450B.
hongsoo88  (posted 2015-08-10 13:40:07.357)
Our lab already ordered MMF coupler FCMH2-FCL. and I'm thinkging of buying LP520-MF100 to connect to this coupler use LP520-MF100 as a laser source. To use this LP520-MF100 can I use (1)SR9HF-DB9 and (2) PTLB1 ?
besembeson  (posted 2015-09-24 06:35:51.0)
Response from Bweh at Thorlabs USA: Yes that combination should work, if the laser diode will not be run continuously for long hours, in which case a temperature controlled mount such as the LDM9LP will be recommended. You will also need a laser current controller such as the LDC205C.
ludoangot  (posted 2015-07-02 09:16:18.49)
In response to my own inquiry, this can help other customers: I have just found out that the external thread on the SR9x series of cable fits the following adapter: S05LEDM and S1LEDM. Thorlabs, could you then offer the S05LEDM and S1LEDM without the LED mounting accessories (for a cheaper price), as part of your standard line of adapters?
ludoangot  (posted 2015-06-03 15:07:05.723)
Could you offer an adapter to mount the SR9 cable to SM1 tubes (internal = thread of the SR9 and external SM1 threads)? This would allow a great flexibility in building custom optical designs integrating the advantages of that cable (ESD protection, strain relief).
jlow  (posted 2015-08-25 11:49:23.0)
Response from Jeremy at Thorlabs: We offer this adapter at http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=366. For Ø9mm LD, the part number is S1PLDM9. For Ø5.6mm LD, the part number is S1PLM56.
lin.borowski  (posted 2013-08-21 11:10:19.773)
Liebes Thorlabs Team, für Beleuchtungszwecke verwenden wir eine LED mit der Halterung SM05 LED Mount for TO-18, 46... Um Lötarbeit zu sparen würden wir diese gerne mit dem SR9A Kabel kombinieren. Damit man das Kabel aber sicher auf dem SM05 LED-Mount aufschauben kann, müßte diese einige mm länger sein. Gibt es ein entsprechendes Bauteil, bzw. Adapter? Oder ein Adapter um ein simples T 1-3/4 Package bzw. TO-46 Package in einer LT110P-B Collimation Tube zu verwenden? Vielen Dank, mit freundlichen Grüßen Lin Robert Borowski
jlow  (posted 2013-09-17 16:54:00.0)
Response from Jeremy at Thorlabs: Thank you for contacting Thorlabs. We will contact you directly on putting together the SR9A cable with the S05LEDM for your application.

ESD Protection and Strain Relief Cables

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
SR9A Support Documentation
SR9AESD Protection and Strain Relief Cable, Pin Codes A and E, 3.3 V
$51.00
Today
SR9A-DB9 Support Documentation
SR9A-DB9ESD Protection and Strain Relief Cable, Pin Codes A and E, 3.3 V, with DB9
$54.32
Today
SR9B Support Documentation
SR9BESD Protection and Strain Relief Cable, Pin Codes B and H, 3.3 V
$51.00
Today
SR9B-DB9 Support Documentation
SR9B-DB9ESD Protection and Strain Relief Cable, Pin Codes B and H, 3.3 V, with DB9
$54.32
Today
SR9C Support Documentation
SR9CESD Protection and Strain Relief Cable, Pin Codes C and H, 3.3 V
$51.00
Today
SR9C-DB9 Support Documentation
SR9C-DB9ESD Protection and Strain Relief Cable, Pin Codes C and H, 3.3 V, with DB9
$54.32
Today
SR9D Support Documentation
SR9DESD Protection and Strain Relief Cable, Pin Code D, 3.3 V
$51.00
Today
SR9D-DB9 Support Documentation
SR9D-DB9ESD Protection and Strain Relief Cable, Pin Code D, 3.3 V, with DB9
$54.32
Today
SR9HA Support Documentation
SR9HACustomer Inspired! ESD Protection and Strain Relief Cable, Pin Codes A and E, 7.5 V
$51.00
Today
SR9HA-DB9 Support Documentation
SR9HA-DB9Customer Inspired! ESD Protection and Strain Relief Cable, Pin Codes A and E, 7.5 V, with DB9
$54.32
Today
SR9HB Support Documentation
SR9HBCustomer Inspired! ESD Protection and Strain Relief Cable, Pin Codes B and H, 7.5 V
$51.00
Today
SR9F Support Documentation
SR9FESD Protection and Strain Relief Cable, Pin Codes F and G, 3.3 V
$51.00
Today
SR9F-DB9 Support Documentation
SR9F-DB9ESD Protection and Strain Relief Cable, Pin Codes F and G, 3.3 V, with DB9
$54.32
Today
SR9HB-DB9 Support Documentation
SR9HB-DB9Customer Inspired! ESD Protection and Strain Relief Cable, Pin Codes B and H, 7.5 V, with DB9
$54.32
Today
SR9HF Support Documentation
SR9HFESD Protection and Strain Relief Cable, Pin Codes F and G, 7.5 V
$51.00
Today
SR9HF-DB9 Support Documentation
SR9HF-DB9ESD Protection and Strain Relief Cable, Pin Codes F and G, 7.5 V, with DB9
$54.32
Today
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Last Edited: Jul 31, 2013 Author: Dave Gardner