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TL431CDR

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Texas Instruments Voltage Reference, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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docs tl431cdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers tl431cdr: viewers · Ray 1mo ago
package.json tl431cdr: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 1mo ago
page.json tl431cdr: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 26d ago
README.md tl431cdr: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 26d ago
tl431cdr-etched.fit.json tl431cdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431cdr-etched.glb tl431cdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431cdr-etched.step tl431cdr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431cdr.glb Publish 0.1.0 · Ray 1mo ago
tl431cdr.kicad_mod Publish 0.1.0 · Ray 1mo ago
tl431cdr.kicad_sym Publish 0.1.0 · Ray 1mo ago
tl431cdr.lbr Publish 0.1.0 · Ray 1mo ago
tl431cdr.step Publish 0.1.0 · Ray 1mo ago

TL431CDR

Texas Instruments · Voltage Reference · SOIC-8

TL431CDR from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CATHODE output Output terminal supporting 1 to 100 mA continuous shunt current sink with programmable voltage from Vref (approximately 2.5V) to 36V and 0.2Ω typical output impedance.
2 ANODE power_in Common ground return pin for regulator; must be connected to system ground with all other ANODE pins for proper current distribution.
3 ANODE power_in Common ground return pin for regulator; must be connected to system ground with all other ANODE pins for proper current distribution.
4 NC unconnected No internal connection; leave unconnected per datasheet specifications.
5 NC unconnected No internal connection; leave unconnected per datasheet specifications.
6 ANODE power_in Common ground return pin for regulator; must be connected to system ground with all other ANODE pins for proper current distribution.
7 ANODE power_in Common ground return pin for regulator; must be connected to system ground with all other ANODE pins for proper current distribution.
8 REF input Reference input pin with nominal threshold of 2.495V requiring 2 to 4 µA input current for linear operation as feedback node to set regulator output voltage.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Power Management (PMIC)
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Reference Voltage Vref 2440 2495 2550 mV VKA = Vref, IKA = 10mA 6
Deviation of reference input voltage over full temperature range (All other devices) VI(dev) 4 25 mV VKA = Vref, IKA = 10mA; All other devices 6
Ratio of change in reference voltage to change in cathode voltage ΔVref / ΔVKA -1.4 -2.7 mV/V IKA = 10mA, ΔVKA = 10V - Vref 6
Ratio of change in reference voltage to change in cathode voltage ΔVref / ΔVKA -1 -2 mV/V IKA = 10mA, ΔVKA = 36V - 10V 6
Reference Input Current Iref 2 4 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 6
Deviation of reference input current over full temperature range II(dev) 0.4 1.2 µA IKA = 10mA, R1 = 10kΩ, R2 = ∞ 6
Minimum cathode current for regulation Imin 0.4 1 mA VKA = Vref 6
Off-state cathode current Ioff 0.1 1 µA VKA = 36V, Vref = 0 6
Dynamic Impedance /ZKA/ 0.2 0.5 Ω VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA 6
Cathode Voltage VKA 37 V 5
Continuous Cathode Current Range IKA -100 150 mA 5
Reference Input Current II(ref) -0.05 10 mA 5
Operating Junction Temperature Range TJ 150 °C 5
Storage Temperature Range Tstg -65 150 °C 5
Cathode Voltage VKA 36 V 5
Continuous Cathode Current Range IKA 1 100 mA 5
Operating Free-Air Temperature TA 0 70 °C TL43xxC 5
Junction-to-ambient thermal resistance (D package, 8 pins) RθJA 97 °C/W D (SOIC, 8 pins) 5
Junction-to-case (top) thermal resistance (D package, 8 pins) RθJC(top) 39 °C/W D (SOIC, 8 pins) 5

CAD (KiCad official)

  • Symbol: TL431CDR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: tl431cdr-etched.step / tl431cdr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431cdr.step / tl431cdr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (85 pp, sha256 ed2e90697de4e2c5, retrieved 2026-09-22, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF