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SN74LS126ADR

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Texas Instruments Buffers, Drivers, Receivers, Transceivers, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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README

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SN74LS126ADR

Texas Instruments · Buffers, Drivers, Receivers, Transceivers · SOIC-14

SN74LS126ADR from Texas Instruments, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 1G input Output enable for channel 1; on the '126/LS126A the outputs are disabled when G is low, so G is active-high enable (the overbar shown for the '125 variant does not apply).
2 1A input Data input for channel 1; for the LS126A, IIL is -0.4 mA max at VI = 0.4 V and IIH is 20 µA max at VI = 2.7 V.
3 1Y tri_state Three-state buffer output for channel 1; when enabled it sinks up to 24 mA (IOL max) and sources up to -2.6 mA (IOH max), and it is high-impedance when disabled.
4 2G input Output enable for channel 2; on the '126/LS126A the outputs are disabled when G is low, so G is active-high enable.
5 2A input Data input for channel 2; for the LS126A, IIL is -0.4 mA max at VI = 0.4 V and IIH is 20 µA max at VI = 2.7 V.
6 2Y tri_state Three-state buffer output for channel 2; when enabled it sinks up to 24 mA (IOL max) and sources up to -2.6 mA (IOH max), and it is high-impedance when disabled.
7 GND power_in Ground reference for the device; voltages are referenced to the network ground terminal.
8 3Y tri_state Three-state buffer output for channel 3; when enabled it sinks up to 24 mA (IOL max) and sources up to -2.6 mA (IOH max), and it is high-impedance when disabled.
9 3A input Data input for channel 3; for the LS126A, IIL is -0.4 mA max at VI = 0.4 V and IIH is 20 µA max at VI = 2.7 V.
10 3G input Output enable for channel 3; on the '126/LS126A the outputs are disabled when G is low, so G is active-high enable.
11 4Y tri_state Three-state buffer output for channel 4; when enabled it sinks up to 24 mA (IOL max) and sources up to -2.6 mA (IOH max), and it is high-impedance when disabled.
12 4A input Data input for channel 4; for the LS126A, IIL is -0.4 mA max at VI = 0.4 V and IIH is 20 µA max at VI = 2.7 V.
13 4G input Output enable for channel 4; on the '126/LS126A the outputs are disabled when G is low, so G is active-high enable.
14 VCC power_in Supply voltage: 4.75 V min, 5 V nominal, 5.25 V max for the SN74LS126A, with operating free-air temperature 0 °C to 70 °C.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-14
Category Logic
Pins 14

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Supply voltage (recommended) VCC 4.75 5 5.25 V 6
High-level input voltage VIH 2 V 6
Low-level input voltage VIL 0.8 V 6
High-level output current IOH -2.6 mA 6
Low-level output current IOL 24 mA 6
Operating free-air temperature TA 0 70 °C 6
Supply voltage (absolute maximum) VCC 7 V Voltage values with respect to network ground terminal 4
Input voltage (absolute maximum) VI 7 V 'LS125A and 'LS126A 4
Storage temperature range Tstg -65 150 °C 4
Package thermal impedance, D package θJA 86 °C/W D package, calculated per JESD 51-7 4
Input clamp voltage VIK -1.5 V VCC=MIN, II=-18 mA 6
High-level output voltage VOH 2.4 V VCC=MIN, VIH=2 V, VIL=0.8 V, IOH=-2.6 mA 6
Low-level output voltage VOL 0.25 0.4 V VCC=MIN, VIH=2 V, VIL=0.8 V, IOL=12 mA 6
Low-level output voltage VOL 0.35 0.5 V VCC=MIN, VIH=2 V, VIL=0.8 V, IOL=24 mA 6
Off-state output current, high-level voltage applied IOZ 20 µA VCC=MAX, VIH=2 V, VIL=0.8 V, VO=2.4 V 6
Off-state output current, low-level voltage applied IOZ -20 µA VCC=MAX, VIH=2 V, VIL=0.8 V, VO=0.4 V 6
Input current at maximum input voltage II 0.1 mA VCC=MAX, VI=7 V 6
High-level input current IIH 20 µA VCC=MAX, VI=2.7 V 6
Low-level input current IIL -0.4 mA VCC=MAX, VI=0.4 V, all inputs of 'LS126A 6
Short-circuit output current IOS -40 -225 mA VCC=MAX 6
Supply current, LS126A ICC 12 22 mA VCC=MAX, data inputs=0 V, output control=0 V (see Note 4) 6
Output enable time to high level, LS126A tPZH 16 25 ns VCC=5 V, TA=25°C, RL=667 Ω, CL=45 pF 6
Output enable time to low level, LS126A tPZL 21 35 ns VCC=5 V, TA=25°C, RL=667 Ω, CL=45 pF 6

CAD (KiCad official)

  • Symbol: SN74LS126ADR
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOIC-14 (KiCad packages3D, STEP)
  • 3D model files: sn74ls126adr-etched.step / sn74ls126adr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ls126adr.step / sn74ls126adr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (28 pp, sha256 f3be4110bb5f169b, retrieved 2026-10-18, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (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