Texas Instruments SN74LVC1G125YEPR

Overview

SN74LVC1G125 from Texas Instruments is a single 3-state bus buffer gate used for signal isolation and bus contention control in low-voltage digital systems. It features true non-inverting logic, 3.3V/5V supply compatibility (1.65–5.5V), ±24mA output drive at 3.3V, 3.7ns max propagation delay, and Ioff support for live insertion.

For engineers reviewing the SN74LVC1G125 datasheet, SN74LVC1G125 pinout, SN74LVC1G125 application, or SN74LVC1G125 equivalent, key selection criteria include 3-state enable timing (ten/tdis), over-voltage tolerant inputs (up to 5.5V), ultra-small X2SON-5 (DPW) package footprint (0.8mm × 0.8mm), and partial power-down capability during VCC = 0V operation.

Technical Context

The SN74LVC1G125 implements a CMOS-based non-inverting buffer with active-low 3-state enable (OE). Its functional mode is defined by OE: low enables A→Y pass-through; high forces Y into high-impedance. Input structure supports over-voltage tolerance up to 5.5V independent of VCC, enabling level translation from 3.3V to 5V systems.

It uses balanced CMOS 3-state outputs capable of sourcing/sinking symmetric current (±24mA at 3.3V), with Ioff circuitry that disables all outputs when VCC = 0V-critical for hot-swap and back-drive protection. Propagation delay is load-dependent (CL = 15pF/30pF/50pF) and specified across –40°C to 125°C.

Key Specifications

Pinout & Package

SN74LVC1G125YEPR is packaged in the DPW (X2SON-5) ultra-small outline package measuring 0.8mm × 0.8mm with 0.5mm pitch. This 5-pin, no-lead, bottom-terminal package is optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G126YEPR, SN74LVC1G125YEPR delivers true-level pass-through for synchronous bus control; versus NC7SZ125P5X, it offers superior thermal performance (125°C vs. 85°C), tighter propagation delay control, and broader VCC flexibility-making it optimal for industrial and mission-critical embedded designs.

Availability

SN74LVC1G125YEPR is available at Aetrix Electronics and suitable for cable modem termination systems, high-speed data acquisition platforms, and military radar subsystems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature extremes.

Supply support for SN74LVC1G125YEPR 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 leader specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LVC1G125 belongs to TI's LVC low-voltage CMOS logic family, engineered for high-speed, low-power, mixed-voltage interfacing in space- and power-constrained embedded systems.

FAQ

What is the maximum operating temperature for SN74LVC1G125YEPR?

The SN74LVC1G125YEPR is rated for continuous operation from –40°C to +125°C ambient temperature. This specification is verified per JEDEC JESD22-A108 and applies across the full recommended VCC range (1.65V–5.5V). Thermal derating is not required below 125°C, and the device maintains full electrical compliance-including tpd, VOH/VOL, and Ioff-throughout this range. The DPW package's low thermal resistance (RθJA = 340°C/W) supports reliable operation in sealed enclosures or conduction-cooled modules.

Does SN74LVC1G125YEPR support 5V-tolerant inputs when VCC = 1.8V?

Yes, SN74LVC1G125YEPR supports input voltages up to 5.5V regardless of VCC level-including when VCC = 1.8V. This over-voltage tolerance is achieved via an internal protection structure without positive clamp diodes, enabling direct interfacing with 5V TTL or CMOS signals in mixed-voltage systems. The input leakage remains ≤±5μA under these conditions, and VIH/VIL thresholds scale correctly with VCC per the Recommended Operating Conditions table-ensuring robust logic recognition without external level shifters.

What is the recommended pull-up resistor value for OE on SN74LVC1G125YEPR?

TI recommends a 10kΩ pull-up resistor from OE to VCC for SN74LVC1G125YEPR to ensure high-impedance state during power-up/down. This value balances fast enable timing (OE low-to-high transition < 10ns with 10kΩ + 2pF node capacitance) against static current draw (<0.33μA at 3.3V). For systems with high noise immunity requirements, values from 4.7kΩ to 47kΩ are acceptable; however, resistors >100kΩ may cause slow transitions or susceptibility to ESD-induced glitches. No pull-down is permitted-OE must never float.

Can SN74LVC1G125YEPR drive a 50pF load while meeting datasheet timing specs?

Yes, SN74LVC1G125YEPR is characterized for CL = 30pF and CL = 50pF loads across –40°C to 125°C. At VCC = 3.3V and TA = 25°C, tpd remains ≤4.7ns (max) with CL = 50pF. For heavier loads, TI advises adding a series damping resistor (10–33Ω) near the output to suppress ringing-especially on traces >12cm. The device's balanced ±24mA drive ensures stable edges into such loads without oscillation, provided layout follows TI's guidelines: unbroken ground plane, short traces, and proper decoupling (0.1μF ceramic at VCC).

Is SN74LVC1G125YEPR pin-compatible with other 5-pin logic buffers in X2SON packages?

SN74LVC1G125YEPR uses the standardized X2SON-5 (DPW) footprint defined by JEDEC MO-252, making it mechanically compatible with other TI devices like SN74LVC1G00YEPR and SN74LVC1G08YEPR. Pin 1 (A), Pin 2 (OE), Pin 3 (GND), Pin 4 (Y), and Pin 5 (VCC) follow identical mapping. However, logic function and electrical specs differ-so functional substitution requires verification of truth table, drive strength, and timing. Always confirm schematic symbol and footprint match before PCB reuse.