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Texas Instruments CAHCT125QPWRG4Q1
- Part No.:
- CAHCT125QPWRG4Q1
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CAHCT125QPWRG4Q1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,984
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Product details
Overview
CAHCT125QPWRG4Q1 from Texas Instruments is an automotive-grade quadruple 3-state bus buffer IC with TTL-compatible inputs, 4.5–5.5 V supply operation, ±8 mA output drive, and –40°C to +125°C operating range-used for signal isolation and controlled data routing in vehicle body control modules.
For engineers reviewing the CAHCT125QPWRG4Q1 datasheet, CAHCT125QPWRG4Q1 pinout, CAHCT125QPWRG4Q1 application, or CAHCT125QPWRG4Q1 equivalent, key selection criteria include 3-state output control per channel, AEC-Q100 qualification, input transition rate tolerance (20 ns/V), latch-up immunity (>250 mA), and functional safety documentation support.
Technical Context
The CAHCT125QPWRG4Q1 implements four independent non-inverting buffers, each with dedicated active-low output-enable (OE) control enabling per-channel 3-state output assertion. Its CMOS output stage delivers rail-to-rail logic levels with defined VOH (≥3.94 V at –8 mA) and VOL (≤0.44 V at 8 mA) under 5 V supply.
It operates strictly within AEC-Q100 Grade 1 conditions (–40°C to +125°C), supports TTL-voltage compatible inputs (VIH = 2 V, VIL = 0.8 V), and features ESD robustness per HBM (±2000 V) and CDM (±1000 V) standards-critical for automotive infotainment and powertrain interface applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - Ensures compatibility with standard 5 V automotive power rails and stable logic thresholds across temperature. |
| Operating Temperature | –40°C to +125°C - Qualified per AEC-Q100 Grade 1 for under-hood and cabin-located ECUs. |
| Output Drive | ±8 mA - Sufficient to drive 50 pF loads while maintaining VOL ≤ 0.44 V and VOH ≥ 3.94 V at full load. |
| Input Compatibility | TTL-level - Accepts 2 V VIH / 0.8 V VIL thresholds, enabling direct interfacing with legacy 5 V TTL logic without level shifters. |
| Propagation Delay | 3.8–6.5 ns (CL = 15 pF) - Supports high-speed digital control paths in body electronics and sensor aggregation nodes. |
| ESD Rating | HBM ±2000 V, CDM ±1000 V - Meets automotive system-level ESD immunity requirements per ISO 10605. |
| Quiescent Current | 2–20 µA - Enables low-power standby modes in always-on vehicle networks without significant battery drain. |
Pinout & Package
TSSOP-14 (PW) package: 5 mm × 6.4 mm footprint, 0.65 mm lead pitch, thermally enhanced with exposed pad (PAD pin 7 connected to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Individually disables corresponding Y output into high-impedance state; tie to VCC via pullup for power-up safe default. |
| 1A–4A | Buffer input | Non-inverting data input per channel; TTL-compatible, must be terminated to VCC or GND if unused. |
| 1Y–4Y | Buffer output | 3-state CMOS output; drives bus or downstream logic only when OE is low; floats when OE is high. |
| VCC (Pin 14) | Power supply | 5 V nominal supply; requires local 0.1 µF bypass capacitor placed adjacent to pin for noise suppression. |
| GND (Pin 7) | Ground reference | Common return path for all channels; PAD (Pin 7) must be soldered to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel 3-state control | Four independent OE inputs allow selective bus arbitration and dynamic signal routing without external gating logic. |
| AEC-Q100 qualified | Grade 1 qualification ensures reliability in automotive environments including thermal cycling, vibration, and humidity exposure. |
| Functional safety documentation | TI provides FIT rate data, failure mode analysis, and safety manual to support ISO 26262 ASIL-B system integration. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during transient overvoltage events in 12 V vehicle systems. |
| CMOS input structure | Ultra-low input leakage (±1 µA max) minimizes loading on upstream drivers and enables long trace routing without signal degradation. |
Applications
| Body Control Module (BCM) Signal Routing | Automotive Instrument Cluster Interface |
|---|---|
Use Scenario: Isolating CAN transceiver TX/RX lines from microcontroller GPIO during firmware update or sleep mode. IC Role / Device Role / Timing Role: Bus buffer with per-channel 3-state control acts as a configurable signal gate between MCU and communication peripherals. Use Value: Prevents bus contention during MCU reset sequences and reduces electromagnetic interference by disabling unused signal paths. |
Use Scenario: Driving multiplexed LED backlight segments and status indicators from a single microcontroller port. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer enabling direct LED drive without external transistors. Use Value: Eliminates need for discrete driver components while maintaining precise timing control of indicator activation sequences. |
| Door Module Switch Debouncing | Power Distribution Unit (PDU) Status Monitoring |
Use Scenario: Conditioning mechanical switch inputs from door latch, window, and mirror controls before ADC sampling. IC Role / Device Role / Timing Role: Input filter and noise suppression buffer with fast propagation delay (<6.5 ns) and TTL-compatible thresholds. Use Value: Rejects contact bounce and EMI-induced glitches without adding software debounce latency or external RC networks. |
Use Scenario: Aggregating fault signals (overcurrent, open-load, short-to-battery) from multiple smart FET drivers to central controller. IC Role / Device Role / Timing Role: Fault bus concentrator with 3-state outputs enabling shared reporting line and priority-based interrupt arbitration. Use Value: Reduces wiring harness complexity and enables scalable expansion of monitored circuits without additional MCU pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125QPWRQ1 | No green marking (RoHS-compliant but no G4 suffix); identical electrical specs and packaging. | Same automotive qualification and thermal performance; differs only in TI's internal tape-and-reel marking convention. | Select when sourcing flexibility is required and G4-specific traceability is not mandated by OEM quality systems. |
| CAHCT125QWBQARQ1 | WQFN-14 (BQA) package: 3 mm × 2.5 mm, no leads, exposed thermal pad. | Enables higher board density in space-constrained modules (e.g., seat control units); requires different reflow profile and layout rules. | Choose for miniaturized designs where PCB area savings outweigh assembly process changes and thermal pad soldering validation. |
Compared with SN74AHCT125QPWRQ1, CAHCT125QPWRG4Q1 offers identical functionality with TI's G4 green-process marking for enhanced environmental compliance tracking; versus CAHCT125QWBQARQ1, it trades compactness for easier hand-soldering, test probe access, and legacy TSSOP footprint compatibility.
Availability
CAHCT125QPWRG4Q1 is available at Aetrix Electronics and suitable for automotive body electronics, instrument cluster interfaces, and power distribution unit monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CAHCT125QPWRG4Q1 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 automotive ICs, with decades of experience delivering high-reliability solutions for transportation, industrial, and communications markets.
The SN74AHCT125-Q1 product line delivers AEC-Q100-qualified logic devices optimized for automotive signal integrity, fault resilience, and functional safety integration-targeting body control, lighting, and sensor interface subsystems.
FAQ
What is the maximum capacitive load the CAHCT125QPWRG4Q1 can drive while meeting all datasheet specifications?
The CAHCT125QPWRG4Q1 is characterized and guaranteed to meet all switching and DC specifications with a 50 pF load capacitance. While larger loads may be driven, propagation delays increase and noise margins degrade beyond this value-TI explicitly recommends limiting total load capacitance to ≤50 pF for reliable operation in automotive applications. CAHCT125QPWRG4Q1 design reviews should verify CL using board-level measurements, not just netlist estimates.
Does the CAHCT125QPWRG4Q1 support hot insertion or live bus connection?
No, the CAHCT125QPWRG4Q1 does not support hot insertion. Its absolute maximum ratings specify that VCC must be powered before applying input signals, and outputs must not be driven while VCC is absent or ramping. Connecting CAHCT125QPWRG4Q1 to an active bus before power-up risks violating input voltage limits (–0.5 V to 7.0 V) and may cause latch-up or ESD damage. System-level hot-swap protection requires external circuitry.
How should unused inputs be handled on the CAHCT125QPWRG4Q1?
All unused inputs on the CAHCT125QPWRG4Q1 must be terminated to either VCC or GND-never left floating-to prevent undefined logic states, increased power consumption, and potential oscillation. TI recommends 10 kΩ pull-up or pull-down resistors for unused OE or A inputs. For example, tying unused 3OE to VCC ensures channel 3 remains disabled, while grounding unused 2A prevents unintended signal coupling. This requirement applies regardless of whether the associated output is used.
Is the CAHCT125QPWRG4Q1 pin-compatible with non-automotive versions like SN74AHCT125?
Yes, CAHCT125QPWRG4Q1 is pin-compatible and functionally identical to SN74AHCT125 in the same TSSOP-14 (PW) package, sharing identical pinout, electrical behavior, and logic function. However, CAHCT125QPWRG4Q1 adds AEC-Q100 Grade 1 qualification, enhanced ESD ratings, and automotive-specific reliability testing-making it suitable for production vehicles where the commercial SN74AHCT125 is not approved.
What is the purpose of the exposed pad (PAD) on the CAHCT125QPWRG4Q1 TSSOP package?
The exposed pad (Pin 7) on the CAHCT125QPWRG4Q1 TSSOP package is electrically connected to GND and serves dual thermal and EMI functions: it lowers junction-to-board thermal resistance (RθJB) to improve power dissipation and provides a low-inductance ground return path for high-frequency switching noise. TI requires the pad to be soldered to a minimum 100 mm² PCB copper area tied to the main ground plane-omitting this compromises both reliability and EMC performance in automotive deployments.
CAHCT125QPWRG4Q1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
CAHCT125QPWRG4Q1 FAQ
1.How can I place an order for CAHCT125QPWRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAHCT125QPWRG4Q1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CAHCT125QPWRG4Q1 reliable?
The price and inventory of CAHCT125QPWRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAHCT125QPWRG4Q1 is usually 5 days.
3.What payment methods are accepted for CAHCT125QPWRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAHCT125QPWRG4Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAHCT125QPWRG4Q1?
CAHCT125QPWRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAHCT125QPWRG4Q1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CAHCT125QPWRG4Q1?
For technical support, including CAHCT125QPWRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAHCT125QPWRG4Q1 requirements.
6.How does Aetrix verify that CAHCT125QPWRG4Q1 is sourced from the original manufacturer or authorized distributors?
All CAHCT125QPWRG4Q1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CAHCT125QPWRG4Q1 meets industry standards.
7.What is the process for return or replacement of CAHCT125QPWRG4Q1?
All CAHCT125QPWRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with CAHCT125QPWRG4Q1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CAHCT125QPWRG4Q1 part is unused and in its original packaging.
Return procedure for CAHCT125QPWRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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