The SN74LS157D sources 400 µA and sinks 8 mA per output. That sink capability is enough to drive a standard TTL input or a low-power LED indicator directly, but it will not handle a relay coil or a bus transceiver without a buffer. If the downstream load demands more than 8 mA per channel, plan on a line driver or a higher-drive logic family.
SN74LS157D 74LS Quad 2:1 Multiplexer, SOIC-16, Active
MPNSN74LS157D
End of Life
Texas Instruments SN74LS157D, 74LS series, Type Multiplexer, Circuit 4 x 2:1, Single Supply 4.75V ~ 5.25V, Surface Mount 16-SOIC, 0°C ~ 70°C.
$0.96Ref. price · indicative, final on quote
Packaging16-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74LS
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Type | Multiplexer |
| Series | 74LS |
| Mounting | Surface Mount |
| Supply voltage | 4.75V ~ 5.25V |
| Voltage supply source | Single Supply |
| Current - output high, low | 400µA, 8mA |
| Operating temperature | 0°C ~ 70°C |
| Circuit | 4 x 2:1 |
| Package | Tube |
| Case | 16-SOIC (0.154\", 3.90mm Width) |
| Independent circuits | 1 |
Product details
Frequently asked questions
What is the function of the SN74LS157D?
It is a quad 2:1 multiplexer — four independent 2-input multiplexers sharing a common select line. Each multiplexer passes one of two data inputs to its output based on the select signal.
Can I use a 74LS157 in a DIP package instead of the SN74LS157D SOIC?
Yes — the SN74LS157N is the 16-pin DIP version of the same quad 2:1 multiplexer. Function and pinout are identical; the only difference is the package footprint.
What is the recommended replacement or equivalent for the SN74LS157D?
No direct replacement is listed. The SN74LS348N is a different device (priority encoder, 1 x 8:3) and is not a functional substitute. For a form-fit-function alternative, look at the 74HC157 or 74HCT157 in SOIC-16 if the system can tolerate the supply voltage difference.