Texas Instruments CAHC1G125QDCKRQ1

Overview

CAHC1G125QDCKRQ1 from Texas Instruments is an automotive-grade single 3-state bus buffer gate with integrated voltage translation, performing Y = A in positive logic. It operates from 2 V to 5.5 V, delivers ±8 mA output drive at 5 V, supports -40°C to +125°C ambient, and features 10 µA max ICC - used for signal enable/disable and LED control in vehicle body electronics.

For engineers reviewing the CAHC1G125QDCKRQ1 datasheet, CAHC1G125QDCKRQ1 pinout, CAHC1G125QDCKRQ1 application, or CAHC1G125QDCKRQ1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, SC70-5 package footprint, 3-state timing (TEN/TDIS < 10.5 ns @ 5 V), and CMOS input compatibility across 1.8–5 V logic domains.

Technical Context

This device implements a single non-inverting buffer with active-high output enable (OE) controlling high-impedance state entry/exit. Its balanced CMOS 3-state outputs support bidirectional voltage translation between mixed-supply systems (e.g., 3.3-V controller driving 5-V bus).

It uses standard CMOS inputs with ≤10 pF input capacitance and meets AEC-Q100 requirements for automotive reliability: HBM ESD level 2 (±2 kV), CDM level C4B (±1 kV), and latch-up immunity >250 mA per JESD17 - validated across full -40°C to +125°C temperature range.

Key Specifications

Pinout & Package

CAHC1G125QDCKRQ1 is packaged in a 5-pin SC70 (DCK) case measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), optimized for space-constrained automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125QDCKRQ1 and MC74VHC1GT125DTT1G, CAHC1G125QDCKRQ1 offers optimal balance of wide supply range (2–5.5 V), proven thermal performance in SC70, and AEC-Q100 compliance - making it preferred for mixed-voltage automotive subsystems where supply headroom and layout flexibility are critical.

Availability

CAHC1G125QDCKRQ1 is available at Aetrix Electronics and suitable for automotive body control, infotainment, ADAS camera interfaces, and LED driver circuits requiring stable component supply across extended temperature ranges.

Supply support for CAHC1G125QDCKRQ1 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 delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The SN74AHC1G125-Q1 belongs to TI's automotive-qualified AHC logic family, engineered specifically for robust signal buffering in harsh-temperature vehicle subsystems with strict ESD and reliability requirements.

FAQ

What is the maximum capacitive load supported by CAHC1G125QDCKRQ1 while maintaining specified timing?

CAHC1G125QDCKRQ1 maintains full specification compliance up to 50 pF load capacitance. At CL = 50 pF and 5 V supply, propagation delay increases to 9.5 ns (max), TEN to 9 ns (max), and TDIS to 11 ns (max). Exceeding 50 pF may degrade timing margins and increase power dissipation - verify system-level timing with actual board parasitics when designing with heavier loads.

Does CAHC1G125QDCKRQ1 support true bidirectional voltage translation?

No, CAHC1G125QDCKRQ1 does not perform bidirectional voltage translation. It provides unidirectional level shifting: input A and enable OE are referenced to VCC, and output Y swings between GND and VCC. While it can translate signals from lower-voltage sources (e.g., 1.8-V A input) to higher-voltage buses (e.g., 5-V Y output), the reverse path is not supported - CAHC1G125QDCKRQ1 is not a bus transceiver.

Can unused input pins on CAHC1G125QDCKRQ1 be left floating?

No, unused input pins on CAHC1G125QDCKRQ1 must never be left floating. The device uses standard CMOS inputs with high impedance; floating inputs cause undefined logic states, increased ICC, and potential oscillation. Per TI's design guidance, tie unused A or OE pins directly to VCC or GND - or use a 10-kΩ pull-up/down resistor if dynamic control is needed later in the system.

What is the recommended bypass capacitor for CAHC1G125QDCKRQ1?

Texas Instruments specifies a 0.1-µF ceramic capacitor placed as close as possible between VCC (pin 5) and GND (pin 3) for CAHC1G125QDCKRQ1. This capacitor must be mounted physically adjacent to the SC70 package with short, direct traces to minimize inductance. For enhanced noise suppression, a parallel 1-µF capacitor is acceptable - but the 0.1-µF unit remains mandatory for high-frequency decoupling per layout guidelines in the datasheet.

Is CAHC1G125QDCKRQ1 pin-compatible with non-automotive versions like SN74AHC1G125DBVR?

Yes, CAHC1G125QDCKRQ1 shares identical pinout, electrical behavior, and logic function with commercial-grade SN74AHC1G125DCKR (SC70-5) and SN74AHC1G125DBVR (SOT-23-5). However, only CAHC1G125QDCKRQ1 carries AEC-Q100 Grade 1 qualification, extended temperature screening, and automotive-specific traceability - making it the sole option approved for safety-critical vehicle applications.