My Inquiry
My Account
Texas Instruments CAHCT125QWBQARQ1
- Part No.:
- CAHCT125QWBQARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
CAHCT125QWBQARQ1.pdf
- Description:
- CAHCT125QWBQARQ1
- Quantity:
- Payment:
- Shipping:
Inventory:4,641
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CAHCT125QWBQARQ1 from Texas Instruments is an automotive-grade quadruple bus buffer gate with independent 3-state outputs, operating from 4.5 V to 5.5 V supply, delivering ±8 mA output drive, 6.5 ns max propagation delay (CL = 15 pF), and qualified for –40°C to +125°C operation in WQFN-14 (BQA) package. It enables signal isolation and bidirectional bus control in automotive body electronics.
For engineers reviewing the CAHCT125QWBQARQ1 datasheet, CAHCT125QWBQARQ1 pinout, CAHCT125QWBQARQ1 application, or CAHCT125QWBQARQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, individual OE control per channel, TTL-compatible inputs, latch-up immunity (>250 mA), and functional safety documentation support.
Technical Context
The CAHCT125QWBQARQ1 implements four independent non-inverting buffers, each with dedicated active-low output-enable (OE) input. Each channel transitions to high-impedance state when its OE is HIGH, and passes A→Y when OE is LOW - enabling per-channel bus arbitration without external logic.
It uses advanced CMOS technology compatible with TTL input thresholds (VIH = 2 V min, VIL = 0.8 V max), supports 50 pF maximum load capacitance while meeting timing specs, and features ESD protection rated at ±2000 V HBM and ±1000 V CDM per AEC-Q100 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with automotive 5 V rail and tolerance to battery transients |
| Operating Temperature | –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and cabin modules |
| Output Drive | ±8 mA - sufficient to drive standard CMOS/TTL loads and small LED indicators directly |
| Propagation Delay | 6.5 ns max (A→Y, CL = 15 pF) - supports reliable data buffering in sub-100 MHz digital subsystems |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interfaces directly with legacy microcontrollers and sensors |
| ESD Rating | ±2000 V HBM - exceeds automotive system-level ESD immunity requirements per ISO 10605 |
| Quiescent Current | 20 µA max (ICC) - enables low-power standby modes in always-on vehicle networks |
Pinout & Package
CAHCT125QWBQARQ1 is housed in a 3 mm × 2.5 mm WQFN-14 (BQA) package with wettable flanks, optimized for automated optical inspection and thermal performance in space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Individually disables each buffer's output to high-impedance; tie to VCC via pullup for power-up safe default |
| 1A–4A | Buffer input | Non-inverting data input per channel; TTL-compatible threshold ensures robust noise margin |
| 1Y–4Y | Buffer output | 3-state output driven by corresponding A input when OE is LOW; open-drain not supported |
| VCC | Power supply | 5 V nominal supply; requires local 0.1 µF bypass capacitor placed adjacent to pin |
| GND | Ground reference | Common return path for all channels; recommended to use solid ground plane beneath package |
Key Features
| Feature | Design Value |
|---|---|
| Individual 3-state control | Four separate OE inputs allow selective channel isolation - critical for multiplexed bus architectures and fault containment |
| AEC-Q100 qualified | Grade 1 (–40°C to +125°C) qualification confirmed per full stress test suite - suitable for engine control, ADAS, and gateway modules |
| Functional safety support | Documentation available (FIT rate, failure mode analysis) to accelerate ISO 26262 ASIL-B system-level certification |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during voltage transients common in 12 V automotive systems |
| Low dynamic power | 14 pF typical power dissipation capacitance - minimizes switching current and heat generation in dense layouts |
Applications
| Automotive Body Control Module (BCM) | Instrument Cluster Interface |
|---|---|
Use Scenario: Isolating LIN or CAN subsystem signals during firmware updates or diagnostic sessions. IC Role / Device Role / Timing Role: Bus buffer with per-channel OE control routes sensor data to MCU while blocking backfeed during reconfiguration. Use Value: Prevents bus contention and unintended peripheral activation using hardware-level gating - no software intervention required. | Use Scenario: Driving multiple LED backlight segments from a single microcontroller GPIO bank. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer between low-drive MCU pins and segmented LED strings. Use Value: Delivers ±8 mA per channel to sustain uniform LED brightness without external transistors or resistors. |
| Door Module Switch Debounce | ADAS Camera Power Sequencing |
Use Scenario: Cleaning mechanical switch inputs before feeding to door lock controller logic. IC Role / Device Role / Timing Role: Input conditioning buffer with controlled rise/fall times (20 ns/V min) suppresses contact bounce artifacts. Use Value: Eliminates false trigger events caused by microsecond-scale switch oscillation - reduces firmware debounce overhead. | Use Scenario: Enabling/disabling camera sensor power rails in precise sequence during vehicle startup. IC Role / Device Role / Timing Role: Synchronized enable gate controlling PMIC enable lines with deterministic propagation delay (≤6.5 ns). Use Value: Ensures strict power-up ordering between image sensor, ISP, and serializer - avoids initialization failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125QPWRQ1 | TSSOP-14 package (5 mm × 6.4 mm); RθJA = 147.7°C/W; same electrical specs | Less compact footprint; higher thermal resistance limits high-density placement | Select when board assembly uses TSSOP-compatible pick-and-place or requires larger solder joints for serviceability |
| SN74AHCT125QDRQ1 | SOIC-14 package (8.65 mm × 6 mm); RθJA = 86°C/W; identical logic behavior and ratings | Legacy through-hole compatible footprint; lower thermal resistance but larger area | Choose for cost-sensitive designs where board space is unconstrained and hand-soldering or rework is anticipated |
Compared with SN74AHCT125QPWRQ1 and SN74AHCT125QDRQ1, CAHCT125QWBQARQ1 offers the smallest PCB footprint (3 mm × 2.5 mm) and wettable flanks for AOI, while maintaining identical timing, drive strength, and AEC-Q100 qualification - making it optimal for next-generation compact automotive ECUs.
Availability
CAHCT125QWBQARQ1 is available at Aetrix Electronics and suitable for automotive body control, instrument cluster interface, door module switch debounce, and ADAS camera power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CAHCT125QWBQARQ1 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 in high-reliability automotive electronics.
The SN74AHCT125-Q1 product line delivers AEC-Q100 qualified, functionally safe bus buffers designed specifically for automotive signal routing, isolation, and level translation in harsh environment applications.
FAQ
What is the maximum capacitive load the CAHCT125QWBQARQ1 can drive while meeting all datasheet timing specifications?
The CAHCT125QWBQARQ1 is specified to meet all timing parameters (tPLH, tPHL, tPZH, etc.) with a 15 pF load. While it can drive up to 50 pF and remain functional, propagation and transition times increase beyond datasheet limits above 15 pF. For guaranteed timing compliance in production, keep total load ≤15 pF per output. CAHCT125QWBQARQ1 design reviews should verify layout parasitics against this limit.
Does the CAHCT125QWBQARQ1 support true bidirectional data flow like a transceiver?
No. The CAHCT125QWBQARQ1 is a unidirectional non-inverting buffer: data flows only from A input to Y output. It does not support automatic direction sensing or reverse-path transmission. Bidirectional operation requires external control logic or a dedicated transceiver IC. CAHCT125QWBQARQ1 is intended for one-way signal routing with 3-state output disable capability.
How should unused inputs be terminated on the CAHCT125QWBQARQ1 to ensure stable operation?
All unused inputs (A or OE) must be tied to a valid logic level - either VCC or GND - to prevent floating states that cause increased ICC, noise susceptibility, or oscillation. TI recommends 10 kΩ pull-up or pull-down resistors for unused OE pins to enforce high-impedance default. Direct connection is acceptable for permanently unused inputs. CAHCT125QWBQARQ1 reliability depends on proper input termination per Section 8.2.1.2 of its datasheet.
Is the CAHCT125QWBQARQ1 pin-compatible with standard SN74AHCT125 devices?
Yes - CAHCT125QWBQARQ1 shares identical logic functionality, pin numbering, and signal assignments with non-automotive SN74AHCT125 variants. However, it is not mechanically pin-compatible with SOIC or TSSOP packages due to its WQFN-14 (BQA) footprint. Board redesign is required to migrate from D or PW packages to CAHCT125QWBQARQ1, though schematic connectivity remains unchanged.
What is the purpose of the functional safety documentation provided for the CAHCT125QWBQARQ1?
The functional safety documentation for CAHCT125QWBQARQ1 includes FIT rate calculation, failure mode effects analysis (FMEA), and diagnostic coverage metrics - enabling system architects to integrate the device into ISO 26262-compliant designs up to ASIL-B. This documentation supports safety case development but does not imply automatic ASIL assignment; CAHCT125QWBQARQ1 must be validated within the full system context.
CAHCT125QWBQARQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-WFDFN Exposed Pad
- 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, Wettable Flank
- Supplier Device Package:
- 14-WQFN (3x2.5)
CAHCT125QWBQARQ1 FAQ
1.How can I place an order for CAHCT125QWBQARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAHCT125QWBQARQ1 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 CAHCT125QWBQARQ1 reliable?
The price and inventory of CAHCT125QWBQARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAHCT125QWBQARQ1 is usually 5 days.
3.What payment methods are accepted for CAHCT125QWBQARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAHCT125QWBQARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAHCT125QWBQARQ1?
CAHCT125QWBQARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAHCT125QWBQARQ1 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 CAHCT125QWBQARQ1?
For technical support, including CAHCT125QWBQARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAHCT125QWBQARQ1 requirements.
6.How does Aetrix verify that CAHCT125QWBQARQ1 is sourced from the original manufacturer or authorized distributors?
All CAHCT125QWBQARQ1 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 CAHCT125QWBQARQ1 meets industry standards.
7.What is the process for return or replacement of CAHCT125QWBQARQ1?
All CAHCT125QWBQARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with CAHCT125QWBQARQ1, 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 CAHCT125QWBQARQ1 part is unused and in its original packaging.
Return procedure for CAHCT125QWBQARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CAHCT125QWBQARQ1 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
