Texas Instruments SN74AHC125PWR-P

Overview

SN74AHC125PWR-P from Texas Instruments is a quadruple 3-state bus buffer gate IC with independent output-enable control per channel, operating across 2 V to 5.5 V, supporting ±8 mA output drive at 5 V, 1 ns minimum propagation delay (tPLH/tPHL), and −40°C to +125°C industrial temperature range - used for signal isolation and data routing in programmable logic controllers and motor control interfaces.

For engineers reviewing the SN74AHC125PWR-P datasheet, SN74AHC125PWR-P pinout, SN74AHC125PWR-P application, or SN74AHC125PWR-P equivalent, key selection criteria include independent OE pin control per buffer, 3-state output behavior during power-up/down, low input leakage (±1 µA), high noise immunity (VIH/VIL thresholds scalable with VCC), and TSSOP-14 package compatibility with high-density PCB layouts.

Technical Context

The SN74AHC125PWR-P implements four identical CMOS buffer gates, each with dedicated active-low output-enable (OE) input controlling high-impedance or pass-through mode. Its logic function follows positive-logic truth table: OE = L enables A→Y transmission; OE = H forces Y into high-Z state. No internal bus-hold or Schmitt-triggering is present.

Power sequencing requires OE tied to VCC via pullup resistor during power-up/down to guarantee high-impedance outputs; minimum resistor value depends on driver sink capability. Input voltage tolerance extends to −0.5 V to 7 V, exceeding VCC, enabling level-shifting applications when VCC matches system logic rails.

Key Specifications

Pinout & Package

TSSOP-14 package (PW), 5.00 mm × 4.40 mm body size, 0.65 mm pitch, surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Compared with SN74AHC125PWR-P, SN74LVC125APW trades 5 V compatibility for higher speed in 3.3 V systems, while 74AHC125PW,118 offers identical performance with alternate supply chain assurance - both require no PCB redesign but differ in voltage support and qualification scope.

Availability

SN74AHC125PWR-P is available at Aetrix Electronics and suitable for programmable logic controllers, motor drives and controls, and Power Over Ethernet (PoE) applications requiring stable component supply, extended temperature operation, and long-term industrial lifecycle support.

Supply support for SN74AHC125PWR-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in industrial, automotive, and communications markets.

The SN74AHC125 product line delivers robust, wide-supply-voltage bus buffering for industrial control and real-time data routing - designed specifically for reliability in harsh environments and seamless integration with microcontroller-based systems.

FAQ

What is the recommended power-up sequence for SN74AHC125PWR-P to avoid bus contention?

Before applying VCC, tie all OE pins to VCC through pullup resistors (minimum value determined by driver sink capability). This ensures all outputs remain in high-impedance state until system firmware initializes GPIOs. The SN74AHC125PWR-P datasheet specifies this requirement to prevent unintended signal coupling during power ramp-up. Failure to do so may cause latch-up or data corruption on shared buses.

Can SN74AHC125PWR-P interface directly between 3.3 V and 5 V logic domains?

No - SN74AHC125PWR-P does not perform level translation. Its VIH/VIL thresholds scale with VCC, so when VCC = 3.3 V, VIH(min) = 2.1 V; a 5 V input exceeds absolute maximum rating (7 V) but violates recommended operating condition. For safe 3.3 V ↔ 5 V interfacing, use SN74AHC125PWR-P only within a single VCC domain, or pair with dedicated level translators like TXB0104.

How many SN74AHC125PWR-P devices can drive a single 50 pF load without exceeding timing specs?

Each SN74AHC125PWR-P output drives up to ±8 mA at 5 V, and its tPLH/tPHL increases to 8.5 ns at CL = 50 pF. Multiple outputs driving the same net increase effective load capacitance linearly. For example, two SN74AHC125PWR-P outputs driving 50 pF total yield ~25 pF each - keeping delays within 6.5 ns. Always verify with actual layout parasitics and worst-case VCC/temperature.

Does SN74AHC125PWR-P include internal ESD protection diodes on I/O pins?

Yes - SN74AHC125PWR-P incorporates built-in ESD protection structures meeting ±1500 V HBM and ±1000 V CDM per JEDEC standards. These diodes clamp transient voltages to GND and VCC rails. However, external series resistors (100 Ω) are still recommended on high-risk I/O lines (e.g., connectors) to limit current during sustained overvoltage events beyond ESD test conditions.

What is the maximum continuous output current per pin for SN74AHC125PWR-P?

The absolute maximum continuous output current per pin is ±25 mA, but the recommended operating condition limits DC output current to ±8 mA at VCC = 5 V to maintain VOH ≥ 3.8 V and VOL ≤ 0.5 V across temperature. Exceeding ±8 mA risks violating output voltage specs and increasing junction temperature beyond thermal design margins - especially critical in TSSOP-14's 147.7°C/W RθJA.