My Inquiry
My Account
Texas Instruments SN74AHCT125QPWRQ1
- Part No.:
- SN74AHCT125QPWRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT125QPWRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,595
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AHCT125QPWRQ1 from Texas Instruments is an automotive-grade quadruple bus buffer gate with independent 3-state outputs, designed for signal isolation and controlled data routing in vehicle ECUs. It operates from 4.5 V to 5.5 V, delivers ±8 mA output drive, supports –40°C to +125°C ambient operation, and features TTL-compatible inputs-enabling direct interface with legacy microcontrollers in body control modules.
For engineers reviewing the SN74AHCT125QPWRQ1 datasheet, SN74AHCT125QPWRQ1 pinout, SN74AHCT125QPWRQ1 application, or SN74AHCT125QPWRQ1 equivalent, key selection criteria include its AEC-Q100 qualification, individual OE control per channel, 3-state output timing (tPLZ ≤ 8 ns at CL = 50 pF), and compatibility with 14-pin TSSOP (PW) layout constraints.
Technical Context
This device implements four independent non-inverting buffers, each with dedicated output-enable (OE) input controlling high-impedance state entry/exit. Each channel passes A→Y when OE is low; all outputs enter high-Z when OE is high-enabling bidirectional bus arbitration without external logic.
It uses advanced CMOS technology with TTL-voltage-compatible inputs (VIH = 2 V min, VIL = 0.8 V max), latch-up immunity >250 mA per JESD17, and ESD robustness (±2000 V HBM, ±1000 V CDM), meeting functional safety requirements for ASIL-B–capable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across automotive battery rail variations including cold-crank (≥4.5 V) and load-dump transients. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and cabin ECU environments. |
| Output Drive | ±8 mA at VOH/VOL - sufficient to drive 50-pF loads while maintaining VOL ≤ 0.44 V and VOH ≥ 3.8 V, supporting standard CMOS/TTL fanout. |
| Propagation Delay | tPLH/tPHL ≤ 8.5 ns at CL = 50 pF - enables reliable timing in 20+ MHz digital control paths such as sensor multiplexing or LED driver enable sequencing. |
| Input Compatibility | TTL-level inputs (VIH ≥ 2 V, VIL ≤ 0.8 V) - allows direct connection to legacy 5-V microcontrollers and discrete logic without level-shifting. |
| 3-State Enable Timing | tPZH/tPLZ ≤ 10 ns at CL = 50 pF - guarantees fast bus release for time-critical arbitration in shared communication lines. |
| Quiescent Current | ICC ≤ 20 µA - minimizes standby power in always-on vehicle modules like door controllers or lighting supervisors. |
Pinout & Package
SN74AHCT125QPWRQ1 is packaged in a 14-pin TSSOP (PW) measuring 5 mm × 6.4 mm, optimized for space-constrained automotive PCBs and compatible with standard surface-mount reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Independent output-enable inputs | Active-low control per channel; tie high via pullup to ensure high-Z during power-up/down-prevents bus contention before system initialization. |
| 1A–4A | Buffer input terminals | CMOS inputs with TTL voltage thresholds; unused inputs must be tied to VCC or GND to avoid floating-induced oscillation and excess current draw. |
| 1Y–4Y | Buffer output terminals | Push-pull 3-state outputs capable of sourcing/sinking ±8 mA; outputs may be paralleled for increased drive strength (e.g., driving multiple LEDs). |
| VCC (Pin 14) | Positive supply | Must be bypassed with 0.1 µF ceramic capacitor placed adjacent to pin to suppress switching noise and maintain rail stability during output transitions. |
| GND (Pin 7) | Ground reference | Common return path for all channels; requires low-impedance connection to system ground plane to limit ground bounce during simultaneous output switching. |
Key Features
| Feature | Design Value |
|---|---|
| Individual 3-state control per channel | Enables selective isolation of four independent signal paths-critical for flexible bus management in multi-sensor clusters or configurable I/O expanders. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use across –40°C to +125°C ambient, including temperature cycling, humidity bias, and mechanical shock testing per JEDEC standards. |
| TTL-compatible inputs | Eliminates need for external level shifters when interfacing with older 5-V MCU GPIOs or discrete logic families, reducing BOM count and board area. |
| Latch-up immunity >250 mA | Ensures robustness against transient overcurrent events in noisy automotive electrical environments, preventing destructive latch-up during load dump or ESD events. |
| Functional safety documentation support | TI provides FIT rate data, failure mode analysis, and diagnostic coverage guidance-facilitating ISO 26262 ASIL-B hardware integration without requiring full custom FMEDA. |
Applications
| Body Control Module Signal Routing | LED Driver Enable Sequencing |
|---|---|
|
Use Scenario: Isolating CAN/LIN transceiver enable signals from microcontroller GPIOs in door module ECUs. IC Role / Device Role / Timing Role: SN74AHCT125QPWRQ1 acts as a buffered, individually gated signal conditioner-each OE controls one transceiver's EN line while suppressing noise coupling between adjacent channels. Use Value: Prevents false wake-up events caused by slow-rising or noisy MCU outputs, leveraging its 0.8 V VIL threshold and 8.5 ns propagation delay to meet LIN physical layer timing budgets. |
Use Scenario: Driving multiple indicator LEDs in instrument cluster backlighting with staggered turn-on to limit inrush current. IC Role / Device Role / Timing Role: SN74AHCT125QPWRQ1 serves as a sequenced enable switch-four independent OE inputs accept PWM or timed GPIO signals to activate LED strings one-by-one. Use Value: Achieves <10 ns inter-channel skew between enable edges, ensuring precise timing alignment without external timing ICs or complex firmware delays. |
| Switch Debounce Interface | Automotive Sensor Multiplexing |
|
Use Scenario: Conditioning mechanical switch inputs (e.g., seat position sensors) before feeding into ADC or GPIO interrupt pins. IC Role / Device Role / Timing Role: SN74AHCT125QPWRQ1 functions as a noise-immune buffer-its TTL-compatible inputs reject sub-200 ns glitches, and 3-state outputs allow software-controlled sampling windows. Use Value: Reduces firmware debounce overhead by filtering >99% of contact bounce energy below 100 kHz, verified per IEC 61000-4-4 EFT testing. |
Use Scenario: Sharing a single ADC input among four temperature sensors in HVAC control units using analog multiplexer enable logic. IC Role / Device Role / Timing Role: SN74AHCT125QPWRQ1 drives analog MUX select lines-its 4.5–5.5 V supply range matches ADC reference rails, and low ICC (<20 µA) avoids loading precision voltage references. Use Value: Enables zero-latency channel switching with tPLZ ≤ 8 ns, preserving signal integrity for 12-bit temperature measurements under dynamic thermal gradients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125AQPWRQ1 | Lower supply range (1.65–5.5 V), higher speed (tPD ≤ 4.2 ns), but only ±24 mA drive and no TTL input compatibility. | Better suited for mixed-voltage 3.3-V/5-V systems with tighter timing margins; unsuitable where legacy 5-V TTL sources require direct interface. | Select when migrating to lower-voltage domains and timing-critical paths dominate over input compatibility needs. |
| MC74VHC125DTG | Industrial-grade (not AEC-Q100), same pinout, identical logic function, but rated only to +85°C and lacks automotive qualification documentation. | Acceptable for non-safety-critical cabin electronics (e.g., infotainment accessories) where cost sensitivity outweighs long-term reliability validation. | Choose only for prototyping or non-automotive derivatives-requires full requalification for production vehicle deployment. |
Compared with SN74AHCT125QPWRQ1, SN74LVC125AQPWRQ1 offers faster switching in modern low-voltage designs but sacrifices TTL input compatibility, while MC74VHC125DTG provides identical functionality at lower cost but lacks AEC-Q100 validation-making SN74AHCT125QPWRQ1 the sole choice for ASIL-B–aligned production ECUs requiring guaranteed automotive reliability.
Availability
SN74AHCT125QPWRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, LED driver interfaces, switch debounce circuits, and sensor multiplexing applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74AHCT125QPWRQ1 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 electronics, with decades of experience delivering high-reliability components for mission-critical systems.
The SN74AHCT125-Q1 product line delivers AEC-Q100–qualified logic solutions for automotive signal conditioning-designed specifically to replace legacy 74-series buffers in ECU designs requiring enhanced noise immunity, wide temperature operation, and functional safety documentation.
FAQ
What is the maximum capacitive load SN74AHCT125QPWRQ1 can drive while meeting all datasheet specifications?
SN74AHCT125QPWRQ1 is characterized to drive loads up to 50 pF while maintaining specified propagation delay, VOH, and VOL values across temperature and voltage. Driving larger capacitances increases tPLH/tPHL and degrades noise margins-TI recommends limiting total load to ≤50 pF unless derating curves from Figure 5-1 and 5-2 are applied for specific operating conditions.
How should unused inputs on SN74AHCT125QPWRQ1 be handled to ensure reliable operation?
All unused inputs on SN74AHCT125QPWRQ1 must be terminated to either VCC or GND-never left floating. TI specifies a 10 kΩ pull-up or pull-down resistor as typical; this prevents undefined logic states, reduces dynamic power consumption, and avoids oscillation due to slow input transitions. Floating inputs increase ICC and risk system-level malfunction in automotive environments.
Does SN74AHCT125QPWRQ1 support hot insertion or live insertion into a powered system?
SN74AHCT125QPWRQ1 is not designed for hot insertion. Its absolute maximum ratings specify VI and VO limits relative to VCC/GND, and applying input signals before VCC ramp-up risks violating –0.5 V minimum VI or exceeding IOK clamp current limits. TI recommends powering VCC first and stabilizing before asserting any inputs or OEs.
What is the purpose of tying OE to VCC through a pullup resistor in SN74AHCT125QPWRQ1 applications?
Tying each OE pin to VCC via a pullup resistor ensures all outputs default to high-impedance during power-up and power-down sequences-preventing bus contention, unintended signal assertion, or back-driving of upstream drivers. The resistor value is determined by the sink capability of the controlling driver and required rise time; 10 kΩ is commonly used for compatibility with standard GPIOs.
Is SN74AHCT125QPWRQ1 pin-compatible with non-automotive versions like SN74AHCT125?
Yes, SN74AHCT125QPWRQ1 shares identical pinout, logic function, and DC/AC electrical characteristics with SN74AHCT125 in the same TSSOP-14 (PW) package. However, SN74AHCT125QPWRQ1 undergoes additional AEC-Q100 stress testing, has automotive-specific lot traceability, and is qualified for –40°C to +125°C operation-making it the required version for production vehicle applications.
SN74AHCT125QPWRQ1 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
SN74AHCT125QPWRQ1 FAQ
1.How can I place an order for SN74AHCT125QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT125QPWRQ1 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 SN74AHCT125QPWRQ1 reliable?
The price and inventory of SN74AHCT125QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT125QPWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74AHCT125QPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT125QPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT125QPWRQ1?
SN74AHCT125QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT125QPWRQ1 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 SN74AHCT125QPWRQ1?
For technical support, including SN74AHCT125QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT125QPWRQ1 requirements.
6.How does Aetrix verify that SN74AHCT125QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT125QPWRQ1 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 SN74AHCT125QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHCT125QPWRQ1?
All SN74AHCT125QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT125QPWRQ1, 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 SN74AHCT125QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHCT125QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHCT125QPWRQ1 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…
