Texas Instruments SN74LVC1G125DCK3

Overview

SN74LVC1G125 from Texas Instruments is a single-channel 3-state bus buffer gate used for signal isolation and bus contention control in low-voltage digital systems. It features true noninverting 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. It is commonly deployed in high-speed data acquisition interfaces and SSD internal signal routing.

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), thermal performance in SC70-5 (RθJA = 371°C/W), and compatibility with 15pF/30pF load conditions across –40°C to 125°C.

Technical Context

The SN74LVC1G125 implements a CMOS-based noninverting buffer with active-low 3-state enable (OE). Its output transitions between driving high, driving low, and high-impedance states based solely on OE and A input logic levels - no internal latching or clocking is involved. The device uses standard CMOS inputs with over-voltage tolerance and balanced push-pull outputs capable of sourcing/sinking equal current.

It supports partial power-down via Ioff circuitry that disables all outputs when VCC = 0V, limiting leakage to ±10μA. Input transition rate requirements (e.g., 5 ns/V at 5V) and mandatory pull-up on OE for power-up safety are design-critical behaviors confirmed across operating temperatures from –40°C to 125°C.

Key Specifications

Pinout & Package

SN74LVC1G125DCK3 uses the SC70-5 (DCK) package: 2.0mm × 2.1mm body, 0.65mm pitch, 5-pin surface-mount outline with exposed pad not present. Pin 1 is marked by dot; orientation follows JEDEC MO-203-DA standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125DCK3, the Nexperia 74LVC1G125GW offers identical electrical performance with added automotive qualification, while the ON Semi NC7SZ125P5X trades Ioff and marginally slower timing for lower unit cost in non-critical applications.

Availability

SN74LVC1G125DCK3 is available at Aetrix Electronics and suitable for SSD internal routing, video transcoder interfaces, military radar acquisition, industrial motor control feedback, and high-speed data acquisition requiring stable component supply across extended temperature ranges.

Supply support for SN74LVC1G125DCK3 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 with over 90 years of innovation in high-reliability components.

The SN74LVC1G125 belongs to TI's LVC (Low-Voltage CMOS) logic family, designed specifically for low-power, high-speed bus interface applications in space-constrained industrial, communications, and computing systems.

FAQ

What is the recommended pull-up resistor value for OE on SN74LVC1G125DCK3?

The OE pin of SN74LVC1G125DCK3 must be tied to VCC through a pull-up resistor to ensure high-impedance state during power-up. TI specifies minimum resistance based on the driver's current-sinking capability: for typical 3.3V operation with 24mA sink capacity, a 4.7kΩ to 10kΩ resistor is recommended. Lower values improve noise immunity but increase static current; 10kΩ balances reliability and power efficiency in most designs.

Does SN74LVC1G125DCK3 support 5V operation?

Yes, SN74LVC1G125DCK3 supports VCC from 1.65V to 5.5V and accepts input voltages up to 5.5V regardless of supply voltage. At 5V VCC, it delivers ±32mA output drive and maintains tpd ≤ 3.4ns (CL = 15pF), making it fully compatible with 5V TTL and CMOS systems while retaining 3.3V interoperability.

Can SN74LVC1G125DCK3 drive a 50pF load reliably?

Yes, SN74LVC1G125DCK3 is characterized for CL = 30pF and 50pF loads across –40°C to 125°C. At 3.3V VCC and 50pF, tpd remains ≤ 4.7ns and VOL stays ≤ 0.55V under 24mA sink. For loads >50pF, TI recommends adding a series damping resistor (e.g., 10–33Ω) near the output to suppress ringing without degrading timing margins.

Is SN74LVC1G125DCK3 pin-compatible with other SC70-5 logic buffers?

SN74LVC1G125DCK3 uses standard SC70-5 pinout (OE-A-GND-Y-VCC), matching industry equivalents like 74LVC1G125GW and NC7SZ125P5X. However, functional differences exist: only SN74LVC1G125DCK3 and 74LVC1G125GW specify Ioff, and voltage thresholds vary slightly. Always verify OE polarity, drive strength, and thermal specs before substitution.

What is the maximum junction temperature for SN74LVC1G125DCK3?

The absolute maximum junction temperature for SN74LVC1G125DCK3 is 150°C, per JESD78 Class II latch-up rating. With RθJA = 371°C/W in SC70-5, continuous 24mA output drive at 5V VCC raises junction temperature ~22°C above ambient. Derating is required above 125°C ambient; thermal simulation or IR measurement is advised for high-power-density layouts.