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Texas Instruments SN74HC125DR — Logic ICs

SN74HC125DR 74HC Quad 3-State Buffer, 2V–6V, 14-SOIC

MPNSN74HC125DR
End of Life

Texas Instruments 74HC series SN74HC125DR, Quad Buffer Non-Inverting, 3-State Output, 2V–6V Supply, 7.8 mA per channel, -40°C to 85°C, 14-SOIC.

$0.44Ref. price · indicative, final on quote
Texas Instruments SN74HC125DR datasheet (PDF)
Packaging14-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74HC
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74HC125DR specifications
ParameterValue
Series74HC
Logic typeBuffer, Non-Inverting
Output type3-State
MountingSurface Mount
Supply voltage2V ~ 6V
Current - output high, low7.8mA, 7.8mA
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
Case14-SOIC (0.154\", 3.90mm Width)
Number of elements4
Number of bits per element1

Product details

Each of the four independent buffers has its own output-enable pin (active low), letting you gate each channel individually.

Where it fits — typical use cases

This buffer is a go-to for bus isolation, signal fan-out, and driving a shared data bus where you need to disconnect the output when it is not addressed. The 3-state outputs let multiple devices share a common line — think memory data buses, peripheral chip-select gating, or level-translating between 5V and 3.3V domains (the 2V–6V supply range covers both).

Supply range and drive — what the numbers mean

The 3-state outputs go high-impedance when the corresponding output-enable pin is pulled high, which is how you share a bus without contention.

Frequently asked questions

What is the difference between SN74HC125DR and SN74HCT125D?

The SN74HC125DR is a standard 74HC (high-speed CMOS) device with a 2V–6V supply range and CMOS-level input thresholds. The SN74HCT125D is a 74HCT variant that uses TTL-compatible input thresholds, making it a direct drop-in replacement for older 74LS or 74TTL logic running on a 5V supply. Both are quad 3-state buffers in the same 14-SOIC footprint, but the HCT version is specifically designed to interface with TTL logic levels.

Can SN74HC125DR be used as a level shifter between 5V and 3.3V?

Yes, within limits. With a 3.3V supply on the buffer, a 5V input will be recognised as a logic high because the 74HC input threshold is typically around 0.7 × VCC (about 2.3V at 3.3V supply). The output will swing rail-to-rail (0V to 3.3V). For the reverse direction (3.3V to 5V), you would power the buffer at 5V and drive the input with a 3.3V signal — the 74HC input threshold at 5V is about 3.5V, so a 3.3V signal may not reliably register as high. A 74HCT or 74LVC part is better suited for that direction.

Is SN74HC125DR RoHS compliant and lead-free?

Yes, the SN74HC125DR is ROHS3 compliant, meaning it meets the latest RoHS directive restrictions on hazardous substances including lead.