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Texas Instruments CAHCT126QPWRG4Q1
- Part No.:
- CAHCT126QPWRG4Q1
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
CAHCT126QPWRG4Q1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,990
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Product details
Overview
CAHCT126QPWRG4Q1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified quadruple bus buffer gate with independent 3-state outputs, operating at 4.5V–5.5V supply, delivering ±8mA drive strength at 5V, TTL-compatible inputs, and functional operation from −40°C to +125°C - used for signal enable/disable in body control modules and infotainment data buses.
For engineers reviewing the CAHCT126QPWRG4Q1 datasheet, CAHCT126QPWRG4Q1 pinout, CAHCT126QPWRG4Q1 application, or CAHCT126QPWRG4Q1 equivalent, key selection criteria include guaranteed 3-state timing (tPZH ≤ 6 ns), latch-up immunity (>250 mA), HBM ESD level 2 (±2 kV), wettable-flank TSSOP-14 package compatibility, and automotive-grade thermal reliability up to 125°C ambient.
Technical Context
This device implements four independent CMOS buffer channels, each with dedicated output-enable (OE) control enabling true 3-state logic isolation. Each channel passes A→Y when OE is high and presents high-impedance (Z) when OE is low - supporting bidirectional bus arbitration and signal gating without contention.
Its TTL-compatible inputs accept 0.8V/2.0V thresholds across full temperature range, while balanced push-pull outputs ensure symmetrical rise/fall times (tPLH/tPHL ≤ 6.5 ns @ 15 pF) and robust noise immunity (VIL(D)/VIH(D) = 0.8V/2.0V). The design includes integrated clamp diodes and supports pulldown-biased OE for power-up/down high-Z safety.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable logic levels and output drive in automotive 5V rail systems with ±10% tolerance. |
| Output Drive | ±8 mA at 5 V - sufficient to drive multiple CMOS loads or LED indicators without external buffers. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - guarantees interoperability with legacy TTL and 5V microcontroller GPIOs. |
| Propagation Delay | tPLH/tPHL ≤ 6.5 ns @ CL = 15 pF - enables reliable timing in sub-100 MHz digital control paths. |
| Operating Temperature | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and dashboard electronics. |
| ESD Rating | HBM ±2 kV, CDM ±1 kV - exceeds automotive ESD immunity standards for assembly and field operation. |
| Latch-up Immunity | >250 mA per JESD17 - prevents destructive latch-up during transient overvoltage events in vehicle power domains. |
Pinout & Package
TSSOP-14 (PW) package: 5 mm × 6.4 mm body, wettable flanks, lead-free NiPdAu finish, MSL Level-1, rated for −40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A, 4A | Input | Four independent data inputs - each routed to corresponding Y output when OE is asserted. |
| 1Y, 2Y, 3Y, 4Y | Output | Four buffered, 3-state outputs - high-impedance when respective OE is low; otherwise pass A→Y. |
| 1OE, 2OE, 3OE, 4OE | Input | Four independent 3-state enable controls - active-high; tie to GND via pulldown resistor for safe power-up state. |
| VCC | Power | 5V supply pin - requires local 0.1 µF bypass capacitor placed adjacent to pin for noise suppression. |
| GND | Ground | Reference return path - must be low-impedance; recommended to use ground flood fill on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with HBM/CDM ESD and latch-up testing - suitable for engine bay and ADAS subsystems. |
| Wettable flank TSSOP package | Enables automated optical inspection (AOI) of solder fillets - improves manufacturing yield and field-reliability verification in automotive production. |
| TTL-compatible inputs | Accepts standard 5V TTL logic levels (0.8V/2.0V thresholds) without level-shifting - simplifies integration with legacy MCU peripherals. |
| Independent 3-state control | Each of four channels has dedicated OE input - allows selective bus isolation without affecting other signals in shared data paths. |
| Clamp diode protection | Integrated negative-input and bidirectional-output clamps - limits transient-induced damage from inductive kickback or ESD events. |
Applications
| Body Control Module (BCM) | Instrument Cluster Interface |
|---|---|
|
Use Scenario: Isolating CAN/LIN transceiver enable lines and sensor multiplexer selects during sleep/wake transitions. IC Role / Device Role / Timing Role: Signal gating buffer with guaranteed high-Z state during power sequencing - prevents backfeeding and bus contention. Use Value: Eliminates need for discrete MOSFET switches; reduces BOM count and layout area while maintaining AEC-Q100 compliance. |
Use Scenario: Driving segmented LCD backlight controls and button LED indicators from a low-drive MCU GPIO bank. IC Role / Device Role / Timing Role: Level-translating current booster - converts weak 5V GPIO outputs into ±8mA-sink/source capable signals. Use Value: Enables direct LED drive without external transistors; supports fast blink patterns (≤6.5 ns edge rates) with minimal jitter. |
| ADAS Camera Power Sequencing | Infotainment Audio Data Bus |
|
Use Scenario: Enabling/disabling I²C clock and data lines between SoC and image sensor during boot and thermal throttling. IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent OE - maintains signal integrity during hot-plug and reset recovery. Use Value: Prevents I²C bus lockup by isolating faulty sensors; supports <10 ns timing margin for 400 kHz Fast-mode Plus operation. |
Use Scenario: Buffering SPDIF or I²S audio data lanes between DSP and codec to reduce crosstalk and impedance mismatch. IC Role / Device Role / Timing Role: Low-skew signal repeater - matches trace lengths and terminates stubs via controlled drive strength. Use Value: Reduces jitter-induced bit errors; maintains <1 ns inter-channel skew across all four lanes for stereo+subwoofer routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125QDRG4Q1 | Quad buffer with common OE (single enable for all channels) instead of independent OE per channel. | Suitable for global bus enable but lacks per-line isolation - not ideal for mixed-signal domain partitioning. | Select when system-level gating suffices and board space favors SOIC-14 over TSSOP-14. |
| SN74LVC126APWRE4Q1 | 3.3V-only operation (1.65V–3.6V), lower drive (±24mA), and different input thresholds (VIL=0.7×VCC). | Requires level-shifting for 5V systems; better suited for low-voltage ADAS domain controllers than legacy 5V clusters. | Choose only if migrating to 3.3V architecture - incompatible with direct 5V replacement due to voltage and threshold mismatch. |
Compared with SN74AHCT125QDRG4Q1 and SN74LVC126APWRE4Q1, CAHCT126QPWRG4Q1 uniquely provides per-channel 3-state control at 5V with automotive-grade thermal and ESD robustness - making it the only option for fault-isolated, mixed-voltage automotive signal routing where individual line disable is required.
Availability
CAHCT126QPWRG4Q1 is available at Aetrix Electronics and suitable for body control modules, instrument cluster interfaces, ADAS camera power sequencing, and infotainment audio data buses requiring stable component supply across automotive production lifecycles.
Supply support for CAHCT126QPWRG4Q1 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 automotive qualification expertise and ISO/TS 16949-compliant manufacturing.
CAHCT126QPWRG4Q1 belongs to TI's automotive logic portfolio designed specifically for signal conditioning, bus isolation, and interface bridging in harsh-temperature vehicle subsystems - emphasizing AEC-Q100 compliance, long-term supply stability, and manufacturability in high-reliability SMT lines.
FAQ
What is the maximum capacitive load supported by CAHCT126QPWRG4Q1 while maintaining specified timing?
CAHCT126QPWRG4Q1 is characterized for CL ≤ 50 pF in switching specifications - tPLH/tPHL ≤ 8.5 ns and tPZH/tPHZ ≤ 10 ns at 5V. Exceeding 50 pF increases propagation delay nonlinearly and may violate setup/hold margins in high-speed interfaces. For loads >50 pF, add series termination or reduce trace length to maintain timing integrity.
Does CAHCT126QPWRG4Q1 require external pull-down resistors on OE pins?
Yes - to guarantee high-impedance state during power-up/down, each OE pin of CAHCT126QPWRG4Q1 must be tied to GND via a pulldown resistor. TI recommends ≥10 kΩ based on driver sourcing capability; values below 1 kΩ risk excessive current draw without improving reliability.
Can unused inputs of CAHCT126QPWRG4Q1 be left floating?
No - all unused inputs of CAHCT126QPWRG4Q1 must be terminated to VCC or GND. Floating TTL-compatible CMOS inputs cause increased power consumption, oscillation, and potential device malfunction. TI specifies 10 kΩ pull-up/down as standard practice for uncommitted A or OE pins.
Is CAHCT126QPWRG4Q1 pin-compatible with non-automotive SN74AHCT126 variants?
No - CAHCT126QPWRG4Q1 shares identical pinout with SN74AHCT126 but is not functionally interchangeable due to AEC-Q100-specific screening, enhanced ESD structure, and tighter parametric limits (e.g., extended temperature range, higher latch-up immunity). Use only in automotive designs requiring Q1 qualification.
What is the thermal resistance (RθJA) of CAHCT126QPWRG4Q1 in its TSSOP-14 package?
CAHCT126QPWRG4Q1 in PW (TSSOP-14) package has RθJA = 113°C/W, measured under JEDEC-standard conditions (1-layer 1-in² copper pad). This value assumes standard PCB layout with adequate copper pour; actual junction temperature must stay below 150°C per absolute maximum ratings.
CAHCT126QPWRG4Q1 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
CAHCT126QPWRG4Q1 FAQ
1.How can I place an order for CAHCT126QPWRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for CAHCT126QPWRG4Q1 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 CAHCT126QPWRG4Q1 reliable?
The price and inventory of CAHCT126QPWRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAHCT126QPWRG4Q1 is usually 5 days.
3.What payment methods are accepted for CAHCT126QPWRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAHCT126QPWRG4Q1 transactions.
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4.How is shipping managed for CAHCT126QPWRG4Q1?
CAHCT126QPWRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAHCT126QPWRG4Q1 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 CAHCT126QPWRG4Q1?
For technical support, including CAHCT126QPWRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAHCT126QPWRG4Q1 requirements.
6.How does Aetrix verify that CAHCT126QPWRG4Q1 is sourced from the original manufacturer or authorized distributors?
All CAHCT126QPWRG4Q1 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 CAHCT126QPWRG4Q1 meets industry standards.
7.What is the process for return or replacement of CAHCT126QPWRG4Q1?
All CAHCT126QPWRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with CAHCT126QPWRG4Q1, 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 CAHCT126QPWRG4Q1 part is unused and in its original packaging.
Return procedure for CAHCT126QPWRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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