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Texas Instruments SN74AHC125QDR
- Part No.:
- SN74AHC125QDR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHC125QDR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,070
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Product details
Overview
SN74AHC125Q from Texas Instruments is an automotive-grade quadruple bus buffer gate with independent 3-state outputs, operating across 2 V to 5.5 V supply voltage, supporting −40 °C to +125 °C ambient temperature, and featuring EPIC™ CMOS process for latch-up immunity >250 mA per JESD17 - used in vehicle infotainment data routing and body control module signal isolation.
For engineers reviewing the SN74AHC125Q datasheet, SN74AHC125Q pinout, SN74AHC125Q application, or SN74AHC125Q equivalent, this page delivers verified functional modes, switching timing at 3.3 V/5 V, thermal resistance (RθJA = 113 °C/W for TSSOP), 3-state enable logic behavior, and automotive AEC-Q100 alignment - all critical for CAN/LIN subsystem interface buffering and ECU-level bus arbitration design.
Technical Context
The SN74AHC125Q implements four independent non-inverting buffers, each with dedicated active-low output-enable (OE) control enabling high-impedance state on Y when OE = HIGH. Each channel operates as a digital pass-through: when OE = LOW, Y follows A; when OE = HIGH, Y enters high-Z.
Its EPIC™ CMOS process ensures rail-to-rail input compatibility (VI = 0 to VCC), low dynamic power dissipation (Cpd = 14 pF at 5 V), and robust noise immunity - with VOL(P) ≤ 0.8 V and VOH(V) ≥ 4.4 V under 50 pF load at 5 V - making it suitable for mixed-voltage board-level interfacing in automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports direct connection to 3.3 V or 5 V rails without level shifters |
| Operating Temp | −40 °C to +125 °C - qualified for under-hood and cabin ECU deployment per AEC-Q100 |
| tPLH / tPHL (5 V) | 3.8 ns min / 6.5 ns max at CL = 15 pF - enables <100 MHz bus toggling in short trace layouts |
| IOL / IOH (5 V) | ±8 mA - drives standard TTL loads and multiple CMOS inputs without fanout limitation |
| RθJA (TSSOP) | 113 °C/W - requires minimal heatsinking in ambient ≤85 °C environments |
| Input Clamp Current | ±20 mA - withstands transient overvoltage events common in 12 V automotive systems |
| ICC (Quiescent) | 4–40 μA - negligible standby current for always-on vehicle modules |
Pinout & Package
SN74AHC125Q is available in two automotive-qualified surface-mount packages: 14-pin SOIC (D) and 14-pin TSSOP (PW). The TSSOP variant measures 5 mm × 6.4 mm (body: 5 mm × 4.4 mm) with 0.65 mm pitch and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 8, 13 | OE (active-low) | Independent 3-state enable per buffer; tie to VCC via pullup for power-up high-Z safety |
| 2, 5, 9, 12 | A (input) | Non-inverting data input per channel; accepts 0–VCC logic levels |
| 3, 6, 10, 11 | Y (output) | Buffered output; enters high-impedance when corresponding OE = HIGH |
| 7 | GND | Ground reference for all channels; must be low-inductance connection |
| 14 | VCC | Single supply rail for all four buffers; bypass with 0.1 μF capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 compliant - validated for −40 °C to +125 °C operation and lifetime reliability in vehicle systems |
| Independent 3-state control | Four separate OE pins allow selective bus isolation without affecting other channels - essential for multi-master arbitration |
| Rail-to-rail input tolerance | VI range = 0 to VCC - eliminates need for external biasing when interfacing with diverse logic families |
| Latch-up immunity | Exceeds 250 mA per JESD17 - protects against ground bounce and supply transients in noisy automotive harnesses |
| Low dynamic power | Cpd = 14 pF - reduces switching current and EMI in high-frequency data paths like LIN gateway interfaces |
Applications
| Infotainment Display Interface | Body Control Module Bus Isolation |
|---|---|
Use Scenario: Routing parallel video sync/data signals between MCU and TFT controller in head unit, where multiple peripherals share a common data bus. IC Role / Device Role / Timing Role: SN74AHC125Q acts as direction-controlled bus buffer, isolating display driver during firmware updates while maintaining signal integrity. Use Value: Enables hot-swappable display firmware loading without disrupting audio or HVAC subsystems - leveraging independent OE control and 3.8 ns propagation delay at 5 V. | Use Scenario: Isolating LIN bus transceiver I/O from microcontroller GPIOs during sleep mode to prevent leakage-induced wakeups. IC Role / Device Role / Timing Role: SN74AHC125Q serves as bidirectional signal gate, placing LIN TX/RX lines in high-Z when MCU enters low-power state. Use Value: Reduces system sleep current by >10 μA per channel versus direct connection - confirmed by ICC ≤ 40 μA quiescent draw. |
| Engine Control Unit Sensor Multiplexing | ADAS Camera Data Conditioning |
Use Scenario: Time-division multiplexing of analog sensor readings (e.g., MAP, IAT) into shared ADC input via digital gating logic. IC Role / Device Role / Timing Role: SN74AHC125Q provides clean, glitch-free digital enable strobes synchronized to ADC sampling clock edges. Use Value: Eliminates crosstalk between sensor channels using precise 5.1 ns tPZH/tPZL (5 V, 50 pF), ensuring accurate 12-bit conversion windows. | Use Scenario: Level-shifting and buffering parallel pixel clock and data lanes from image sensor to SoC in surround-view camera module. IC Role / Device Role / Timing Role: SN74AHC125Q conditions 3.3 V LVCMOS signals to match SoC input thresholds while suppressing ESD-induced jitter. Use Value: Maintains <1 ns skew across four buffered lanes - verified by matched tPLH/tPHL specs - preserving pixel alignment in 1080p@30fps streams. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV125AQPWR | Lower VCC range (1.65–5.5 V); higher tPLH (6.5 ns @ 3.3 V); same pinout and function | Better suited for ultra-low-voltage domains (e.g., 1.8 V logic rails); less margin for 2 V start-stop battery scenarios | Select SN74LV125AQPWR only if system VCC never drops below 1.65 V and timing budget allows +2.7 ns delay overhead |
| MC74VHC125DT | Pin-compatible but non-automotive; rated −40 °C to +85 °C; no AEC-Q100 validation | Acceptable for non-safety-critical consumer or industrial boards; lacks automotive qualification documentation and test reports | Choose MC74VHC125DT only for cost-sensitive prototyping where AEC-Q100 compliance is not required |
Compared with SN74LV125AQPWR and MC74VHC125DT, the SN74AHC125Q uniquely guarantees full automotive temperature range operation, latch-up immunity, and production traceability - making it the sole option for production ECU designs requiring AEC-Q100 Grade 1 certification.
Availability
SN74AHC125Q is available at Aetrix Electronics and suitable for engine control units, infotainment head units, and body control modules requiring stable component supply across extended automotive product lifecycles.
Supply support for SN74AHC125Q 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, embedded processing, and connectivity solutions for automotive, industrial, and personal electronics markets.
The SN74AHC125Q belongs to TI's AHC logic family - engineered specifically for high-speed, low-power, automotive-qualified digital interfacing in harsh electrical environments.
FAQ
What is the maximum recommended operating voltage for SN74AHC125Q?
The SN74AHC125Q has a maximum recommended operating supply voltage of 5.5 V. Its absolute maximum rating is 7 V, but sustained operation above 5.5 V risks parametric degradation and violates AEC-Q100 stress limits. All electrical characteristics - including VOH, VOL, and switching times - are specified up to 5.5 V, and the device is validated for automotive use only within the 2 V to 5.5 V range. Operating the SN74AHC125Q at 6 V may cause accelerated wear-out or intermittent functionality in production ECUs.
Does SN74AHC125Q support hot insertion or live bus connection?
The SN74AHC125Q does not support hot insertion per JEDEC standards. Its input and output structures lack built-in bus-hold or live-insertion protection circuitry. While the device features ±20 mA input clamp current and high latch-up immunity (>250 mA), connecting or disconnecting while powered risks violating absolute maximum ratings on VI or VO during transition states. For live bus applications, TI recommends using the SN74AHC125Q only after system power sequencing is complete - or pairing it with external series resistors and TVS diodes per ISO 7637-2 pulse testing requirements.
Can SN74AHC125Q drive a 50 pF capacitive load at 5 V with guaranteed timing?
Yes, the SN74AHC125Q guarantees switching performance into 50 pF loads at 5 V: tPLH and tPHL are specified at 5.3 ns (min) to 8.5 ns (max), and tPZH/tPZL at 5.1 ns (min) to 8 ns (max). These values are measured under controlled conditions per Figure 5-1 load circuit and appear in Section 4.6 of the datasheet. The SN74AHC125Q maintains these timings across −40 °C to +125 °C, making it suitable for driving longer PCB traces or multiple downstream inputs in automotive domain controllers.
Is there a pin-compatible replacement for SN74AHC125Q with lower power consumption?
No pin-compatible replacement offers lower static power while retaining identical automotive qualification. The SN74AHC125Q draws only 4–40 μA ICC across temperature and voltage - already among the lowest in its class. Alternatives like SN74LVC125A have similar ICC but lack AEC-Q100 Grade 1 validation and exhibit higher dynamic current due to lower threshold voltages. TI's newer AVC or AUP families offer lower Cpd, but none match the SN74AHC125Q's combination of 2 V minimum VCC, 125 °C rating, and pin-for-pin compatibility - confirming SN74AHC125Q remains optimal for legacy and new automotive designs requiring drop-in reliability.
How should unused inputs be handled on SN74AHC125Q?
All unused inputs on the SN74AHC125Q - including OE and A pins of unneeded channels - must be tied to either VCC or GND. Floating inputs cause undefined output states, increased ICC, and potential oscillation due to internal CMOS gate metastability. TI explicitly recommends tying unused OE pins to VCC (via pullup) to ensure default high-Z output, and unused A inputs to GND or VCC depending on desired default logic level. This requirement is documented in Section 4.2 Note 1 and Figure 7-1 layout example - failure to comply risks ECU reset events or electromagnetic emissions exceeding CISPR 25 Class 5 limits.
SN74AHC125QDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74AHC125QDR FAQ
1.How can I place an order for SN74AHC125QDR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC125QDR 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 SN74AHC125QDR reliable?
The price and inventory of SN74AHC125QDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC125QDR is usually 5 days.
3.What payment methods are accepted for SN74AHC125QDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC125QDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC125QDR?
SN74AHC125QDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC125QDR 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 SN74AHC125QDR?
For technical support, including SN74AHC125QDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC125QDR requirements.
6.How does Aetrix verify that SN74AHC125QDR is sourced from the original manufacturer or authorized distributors?
All SN74AHC125QDR 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 SN74AHC125QDR meets industry standards.
7.What is the process for return or replacement of SN74AHC125QDR?
All SN74AHC125QDR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC125QDR, 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 SN74AHC125QDR part is unused and in its original packaging.
Return procedure for SN74AHC125QDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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