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SN74ALS157ANSR

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Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74ALS157ANSR

Texas Instruments · Signal Switches, Multiplexers, Decoders · SOIC-16-208mil

SN74ALS157ANSR from Texas Instruments, in a SOIC-16-208mil. 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 A/B input Common select input that chooses the B data (high) or A data (low) for all four outputs when G is low; the datasheet gives VIH min 2 V and VIL max 0.8 V.
2 1A input Channel 1 data input A, passed to 1Y when G is low and A/B is low; the datasheet gives VIH min 2 V and VIL max 0.8 V.
3 1B input Channel 1 data input B, passed to 1Y when G is low and A/B is high; the datasheet gives VIH min 2 V and VIL max 0.8 V.
4 1Y output Channel 1 true data output; recommended IOH is −0.4 mA and IOL is 8 mA maximum for the SN74ALS157A.
5 2A input Channel 2 data input A, passed to 2Y when G is low and A/B is low; the datasheet gives VIH min 2 V and VIL max 0.8 V.
6 2B input Channel 2 data input B, passed to 2Y when G is low and A/B is high; the datasheet gives VIH min 2 V and VIL max 0.8 V.
7 2Y output Channel 2 true data output; recommended IOH is −0.4 mA and IOL is 8 mA maximum for the SN74ALS157A.
8 GND power_in Ground reference pin for the device.
9 3Y output Channel 3 true data output; recommended IOH is −0.4 mA and IOL is 8 mA maximum for the SN74ALS157A.
10 3B input Channel 3 data input B, passed to 3Y when G is low and A/B is high; the datasheet gives VIH min 2 V and VIL max 0.8 V.
11 3A input Channel 3 data input A, passed to 3Y when G is low and A/B is low; the datasheet gives VIH min 2 V and VIL max 0.8 V.
12 4Y output Channel 4 true data output; recommended IOH is −0.4 mA and IOL is 8 mA maximum for the SN74ALS157A.
13 4B input Channel 4 data input B, passed to 4Y when G is low and A/B is high; the datasheet gives VIH min 2 V and VIL max 0.8 V.
14 4A input Channel 4 data input A, passed to 4Y when G is low and A/B is low; the datasheet gives VIH min 2 V and VIL max 0.8 V.
15 G input Active-low strobe; when G is high all outputs are forced low, and when G is low the selected data passes to the outputs.
16 VCC power_in Supply pin; recommended 4.5 V to 5.5 V (5 V nominal) with a 7 V absolute maximum.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-16-208mil
Category Logic
Pins 16

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 VCC 4.5 5 5.5 V 4
High-level input voltage VIH 2 V 4
Low-level input voltage VIL 0.8 V 4
High-level output current IOH -0.4 mA 4
Low-level output current IOL 8 mA 4
Operating free-air temperature TA 0 70 °C 4
Input clamp voltage VIK -1.2 V VCC = 4.5 V, II = −18 mA 4
Low-level output voltage VOL 0.25 0.4 V VCC = 4.5 V, IOL = 4 mA 4
Low-level output voltage VOL 0.35 0.5 V VCC = 4.5 V, IOL = 8 mA 4
Maximum input current at 7 V II 0.1 mA VCC = 5.5 V, VI = 7 V 4
High-level input current IIH 20 µA VCC = 5.5 V, VI = 2.7 V 4
Low-level input current IIL -0.1 mA VCC = 5.5 V, VI = 0.4 V 4
Output current IO -30 -112 mA VCC = 5.5 V, VO = 2.25 V 4
Supply current (′ALS157A) ICC 6 11 mA VCC = 5.5 V, See Note 1 4
Supply voltage (absolute maximum) VCC 7 V 4
Input voltage (absolute maximum) VI 7 V 4
Operating free-air temperature range (SN74ALS157A) TA 0 70 °C 4
Storage temperature range Tstg -65 150 °C 4
Propagation delay time, low-to-high-level output, A or B to Y tPLH 4 9 14 ns VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX (typ at VCC = 5 V, TA = 25°C) 5
Propagation delay time, high-to-low-level output, A or B to Y tPHL 2 6 12 ns VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX (typ at VCC = 5 V, TA = 25°C) 5
Propagation delay time, low-to-high-level output, A/B to Y tPLH 7 15 24 ns VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX (typ at VCC = 5 V, TA = 25°C) 5
Propagation delay time, high-to-low-level output, A/B to Y tPHL 4 9 17 ns VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX (typ at VCC = 5 V, TA = 25°C) 5
Propagation delay time, low-to-high-level output, G to Y tPLH 7 14 20 ns VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX (typ at VCC = 5 V, TA = 25°C) 5
Propagation delay time, high-to-low-level output, G to Y tPHL 4 10 13 ns VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX (typ at VCC = 5 V, TA = 25°C) 5

CAD (KiCad official)

  • Symbol: SN74ALS157ANSR
  • Footprint: Adom_Gen:Texas_Instruments_SN74
  • 3D model: SOIC-16-208mil (KiCad packages3D, STEP)
  • 3D model files: sn74als157ansr-etched.step / sn74als157ansr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74als157ansr.step / sn74als157ansr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (23 pp, sha256 aabe44bcfa29b169, retrieved 2026-10-21, 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