TC2030-CTX-STDC14 Pinout: ST STDC14 to 6-Pad TC2030

Tag-Connect · Cable pinout

The TC2030-CTX-STDC14 connects an STLINK-V3 debugger's 14-pin STDC14 connector to a 6-pad TC2030 footprint on your PCB, giving you SWD, SWO and reset for STM32 parts with no header fitted.

By John Legg CEng, Chartered Engineer, supplying embedded debug tools since 1990 · Last reviewed 7 Oct 2026

Debugger end
14-pin 0.05″ (1.27 mm) ST STDC14
Board end
TC2030 footprint, 6 pads
Interface
SWD + SWO + nRESET
Not carried
Virtual COM port (pins 13, 14), JTDI

Connector to Tag-Connect Head

TC2030-CTX-STDC14 wiring from the ST STDC14 connector to the TC2030 footprint The 14-pin connector is drawn as two rows of seven pins, pin 1 top left, odd pins on the top row. Pin 3 T_VCC goes to pad 1, pin 4 SWDIO to pad 2, pin 12 NRST to pad 3, pin 6 SWCLK to pad 4, pins 5 and 7 ground to pad 5, pin 8 SWO to pad 6. Pins 1, 2, 9, 10, 11, 13 and 14 are not drawn as connected. The footprint is drawn from the PCB top side with the single alignment hole on the right. key 1234567891011121314 123456 T_VCC · pin 3 → pad 1GND · pins 5,7 → pad 5NRST · pin 12 → pad 3SWO · pin 8 → pad 6SWCLK · pin 6 → pad 4SWDIO · pin 4 → pad 2 DEBUGGER END 14-pin 0.05″ STDC14, pin side, pin 1 top left BOARD END TC2030, PCB top view, hole on the right
Power reference Ground Data Clock Reset Trace Not connected
Alignment hole Ø0.99 mm (0.039″), non-platedKeep-out: no tracks or viasPad Ø0.79 mm (0.031″), no solder paste
Each line runs from a pin on the STLINK-V3's STDC14 connector to the pad it reaches on your PCB. STDC14 pins 3 to 12 carry the same signals as Cortex Debug pins 1 to 10, two pins further along, so the board end is wired exactly as the TC2030-CTX. Whether pin 11 (GNDDetect) is also tied to ground in the cable is not published: the manufacturer's table lists ground on pins 5 and 7 only. We have asked Tag-Connect and will update this page when they reply. The footprint is drawn from the component side with the single alignment hole on the right.

Pin Table

TC2030 pad Signal STDC14 pin Connect on your PCB to
1 T_VCC 3 Target Vdd. Sets the debugger's I/O level; no series resistor
2 SWDIO / TMS 4 MCU SWDIO
3 NRST 12 MCU reset pin, active low
4 SWCLK / TCK 6 MCU SWCLK
5 GND 5, 7 Ground
6 SWO / TDO 8 MCU SWO, for trace output. Optional: leave unconnected if not used

STDC14 pins 1 and 2 (reserved), 9, 10 (JTDI), 11 (GNDDetect, see above) and 13, 14 (virtual COM port RX and TX) are not carried, so the STLINK-V3's virtual COM port does not reach your board through this cable.

Pinout confirmed?The TC2030-CTX-STDC14 plugs straight into your debugger's STDC14 connector.

Buy TC2030-CTX-STDC14 →

Footprint

  • Six pads, Ø0.79 mm (0.031″), on a 1.27 mm (0.050″) pitch in two rows of three. Seen from the component side with the single alignment hole on the left, the top row is pads 2, 4, 6 and the bottom row is 1, 3, 5.
  • Legged cables need four extra latch holes; the no-legs (NL) footprint needs only the pads and alignment holes. Mechanical drawings (PDF): TC2030 legged footprint, Rev B and TC2030-NL no-legs footprint, Rev B.
  • No solder paste on the pads. Keep other tracks at least 0.5 mm (0.020″) from any pad.
  • Mark the footprint "do not fit" on your BOM, so nobody tries to buy a part for it.

Debuggers This Cable Fits

ST's STLINK-V3 family with the STDC14 connector, including the STLINK-V3SET, STLINK-V3MINI and STLINK-V3MINIE. For an ST-LINK/V2 with the 20-pin 0.1″ connector, use the ARM20-CTX adapter with a TC2030-IDC cable. For a debugger with the 10-pin 0.05″ Cortex connector, use the TC2030-CTX. Full list in our Tag-Connect cable guide.

Other Versions of This Cable

These cables have the same STDC14 connector and the same TC2030 head, so the diagram and pin table above apply to both. Tag-Connect makes no SOFT or LEMTA version. Differences are highlighted.

Cable Tag-Connect head What is different
TC2030-CTX-STDC14this page Legged The reference cable. Legs clip into the board for hands-free debugging. Buy →
TC2030-CTX-NL-STDC14 No legs Smaller footprint: pads and alignment holes only, no latch holes. Hold it by hand or with a TC2030-CLIP. Formerly sold as TC2030-CTX-NL-ST14. Buy →

Questions

Does the TC2030-CTX-STDC14 Carry the STLINK-V3 Virtual COM Port?

No. STDC14 pins 13 and 14 (T_VCP_RX and T_VCP_TX) are not connected, so bring the UART out separately if you need it.

Is the Board Footprint the Same as for the TC2030-CTX?

Yes. The pad assignment is identical, so one TC2030 footprint works with an STLINK-V3 or any 10-pin Cortex debugger.

Which STDC14 Pin Carries Reset?

Pin 12, T_NRST, wired to TC2030 pad 3.

Buy the Cable and Accessories

Everything on this page uses the TC2030-CTX-STDC14. Add the clip if you choose the no-legs version, or the demo PCB to try the footprint first.

This cable

TC2030-CTX-STDC14

6-pin Plug-of-Nails cable for the STLINK-V3's 14-pin STDC14 connector. SWD, SWO and reset.

Buy TC2030-CTX-STDC14 →

TC2030-CTX-NL-STDC14

No-legs version: smallest footprint, held by hand or with a TC2030-CLIP.

Buy TC2030-CTX-NL-STDC14 →

TC2030-CLIP

Holds a no-legs (NL) cable on the board, so both hands stay free.

Buy TC2030-CLIP →

Pin assignment: Tag-Connect STLINK-V3 cable selection guide and the TC2030-CTX-STDC14 pin table published by collion.de. STDC14 pin functions: ST UM2448 (STLINK-V3SET) Table 6 and UM2910 (STLINK-V3MINIE) Table 4. Cable versions: Tag-Connect product pages. Footprint: Tag-Connect TC2030-IDC footprint drawings, Rev B. Checked 4 Oct 2026. Diagram redrawn by Debug Store in our house style. Tag-Connect and Plug-of-Nails are trademarks of Tag-Connect LLC. Debug Store is a UK specialist distributor of embedded debug, programming and test equipment, supplying engineers worldwide since 1990.

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