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Texas Instruments SN74AHC125QDRG4
- Part No.:
- SN74AHC125QDRG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHC125QDRG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,889
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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, supporting −40 °C to +125 °C ambient temperature, and featuring EPIC™ CMOS process for latch-up immunity >250 mA per JESD17 - used in CAN/LIN interface data routing and automotive body control modules.
For engineers reviewing the SN74AHC125Q datasheet, SN74AHC125Q pinout, SN74AHC125Q application, or SN74AHC125Q equivalent, this page delivers verified electrical specs (tPLH/tPHL ≤ 6.5 ns at 5 V), true 3-state control logic, automotive qualification evidence, and validated TSSOP-14 package implementation guidance.
Technical Context
The SN74AHC125Q implements four independent non-inverting buffers, each with dedicated output-enable (OE) input controlling high-impedance state. Each channel operates with rail-to-rail input compatibility (VI = 0 to VCC) and output drive capability of ±4 mA at 3.3 V and ±8 mA at 5 V.
Its EPIC™ CMOS process ensures low dynamic power (Cpd = 14 pF), fast switching (tPLH/tPHL = 3.8–6.5 ns at 5 V/15 pF), and robust noise immunity (VIL(D) = 1.5 V, VIH(D) = 3.5 V at 5 V). Functional mode is strictly defined by OE/A inputs per Table 6-1: OE = L enables pass-through; OE = H forces Y = Z.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports dual-rail systems and legacy 5 V or modern 3.3 V automotive domains without level shifters. |
| Operating Temperature | −40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood and chassis-mounted ECUs. |
| Output Drive | ±8 mA at 5 V - sufficient to drive 50-pF loads with <8.5 ns propagation delay, enabling direct connection to microcontroller GPIOs or other logic. |
| Propagation Delay | tPLH/tPHL = 3.8 ns (min), 6.5 ns (max) at 5 V/15 pF - ensures timing margin for 100+ MHz bus handshaking in gateway modules. |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - provides >1.2 V noise margin against automotive transients and EMI. |
| Power Dissipation | Cpd = 14 pF - enables sub-1 mW static power at 1 MHz toggle rate, critical for always-on vehicle networks. |
| Latch-up Immunity | >250 mA per JESD17 - withstands transient overcurrent events common in 12 V battery systems with load dump. |
Pinout & Package
TSSOP-14 (PW) package: 5 mm × 6.4 mm body, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 8, 13 | OE (Output Enable) | Active-low control per channel; tie high via pullup during power-up to guarantee safe high-Z state before MCU initialization. |
| 2, 5, 9, 12 | A (Input) | Non-inverting data input; accepts 0–VCC logic levels; no internal pullup/pulldown - must be driven or terminated. |
| 3, 6, 10, 11 | Y (Output) | 3-state buffered output; high-Z when corresponding OE = H; drives to VCC/GND when enabled; supports bus sharing. |
| 7 | GND | Ground reference for all I/O and internal logic; requires low-inductance connection to PCB ground plane. |
| 14 | VCC | Supply voltage input; requires local 0.1 μF ceramic bypass capacitor placed within 3 mm of pin per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Qualification | AEC-Q100 Grade 1 qualified with change control and configuration management support for OEM traceability. |
| 3-State Output Control | Four independent OE inputs enable selective bus isolation - essential for multi-master arbitration in diagnostic and infotainment buses. |
| Rail-to-Rail Input Compatibility | Accepts VI = 0 to VCC without external biasing - simplifies interface to mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V sensor). |
| Low Dynamic Power | 14 pF power dissipation capacitance minimizes switching current - reduces thermal load in dense ECU PCB layouts. |
| High Noise Immunity | Dynamic input thresholds (VIH(D)/VIL(D)) and 0.8 V output noise margins meet ISO 11898-2 requirements for CAN physical layer stability. |
Applications
| Automotive Body Control Module (BCM) | Infotainment System Data Multiplexer |
|---|---|
|
Use Scenario: Isolating LIN bus signals between door module microcontrollers and central gateway MCU during firmware updates. IC Role / Device Role / Timing Role: Quad buffer acts as directionally controlled signal repeater, enabling hot-swap-safe bus segmentation while maintaining timing integrity. Use Value: Prevents bus contention during partial reprogramming; tPLH ≤ 6.5 ns ensures no added latency in LIN frame response windows (≤ 1.2 ms). |
Use Scenario: Routing UART/SPIM signals between application processor and multiple display/audio ICs in head unit design. IC Role / Device Role / Timing Role: Bus buffer provides clean signal fan-out and output enable-based channel selection without clock skew. Use Value: Enables dynamic reconfiguration of peripheral connectivity using OE pins - eliminates need for discrete switches or FPGA glue logic. |
| ADAS Camera Interface Buffer | Electric Power Steering (EPS) Diagnostic Port |
|
Use Scenario: Driving MIPI D-PHY clock/data lines from SoC to camera sensor while meeting EMI limits in compact housing. IC Role / Device Role / Timing Role: Low-capacitance (Ci = 4–10 pF), fast edge-rate buffer minimizes signal degradation on short PCB traces. Use Value: Maintains signal integrity at 100+ MHz pixel clock rates; Cpd = 14 pF reduces radiated emissions vs. standard AHC variants. |
Use Scenario: Providing isolated, 3-state-enabled UART access to EPS motor controller for service tool communication. IC Role / Device Role / Timing Role: Acts as bidirectional bus isolator - OE controls diagnostic port visibility while main ECU remains active. Use Value: Enables field technician access without disrupting real-time torque control loop; latch-up immunity prevents failure during probe contact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV125AQPWRG4 | Lower VCC range (1.65–5.5 V); higher VOL (0.5 V @ 4 mA); slower tPLH (7.5 ns @ 5 V/50 pF) | Better suited for ultra-low-voltage domains (e.g., 1.8 V sensor interfaces); less suitable for 2 V operation or tight-timing 5 V buses. | Select when system uses 1.8 V logic or requires lower ICC (<1 μA), but verify timing margins with worst-case load. |
| MC74VHC125DTG | Non-automotive grade; wider VCC (2–5.5 V); identical pinout; no AEC-Q100 certification or change control. | Valid for industrial or consumer prototypes; not approved for production automotive use due to missing qualification documentation. | Use only for bench validation or non-safety-critical designs where automotive qualification is not mandated. |
Compared with SN74LV125AQPWRG4 and MC74VHC125DTG, the SN74AHC125Q uniquely combines AEC-Q100 Grade 1 qualification, 2 V minimum operation, and 3.8 ns min propagation delay - making it the sole choice for timing-critical, production automotive bus isolation.
Availability
SN74AHC125Q is available at Aetrix Electronics and suitable for automotive body control modules, infotainment data multiplexing, and ADAS camera interface routing requiring stable component supply across extended temperature and long 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 specializing in analog, embedded processing, and automotive ICs, with decades of automotive qualification expertise and broad foundry partnerships.
The SN74AHC125Q belongs to TI's AHC logic family designed specifically for automotive signal integrity and reliability - targeting bus buffering, level translation, and EMI-resilient data routing in harsh-temperature ECUs.
FAQ
What is the maximum operating temperature for the SN74AHC125Q?
The SN74AHC125Q is rated for operation from −40 °C to +125 °C ambient temperature, fully qualified per AEC-Q100 Grade 1. This specification is validated across all electrical parameters in the datasheet's Recommended Operating Conditions table and confirmed in thermal testing per JESD51 standards. The SN74AHC125Q maintains full functionality and timing compliance throughout this range without derating.
Does the SN74AHC125Q support 2 V operation?
Yes, the SN74AHC125Q supports a minimum supply voltage of 2 V as specified in Section 4.2 Recommended Operating Conditions. At 2 V, it delivers guaranteed VOH ≥ 1.9 V and VOL ≤ 0.1 V with IOH/IOL ≥ ±50 μA, enabling interoperability with legacy 2 V logic families and low-power subsystems. This capability is explicitly tested and documented in the Electrical Characteristics table.
Is the SN74AHC125Q pin-compatible with standard SN74AHC125 devices?
No - the SN74AHC125Q is functionally identical but automotive-qualified (AEC-Q100 Grade 1), with enhanced test coverage, change control, and traceability. Its pinout matches the industry-standard 14-pin SOIC/TSSOP layout, but the Q suffix denotes automotive-specific screening and documentation. Standard SN74AHC125 parts lack automotive qualification and configuration control.
What is the recommended bypass capacitor for the SN74AHC125Q?
Texas Instruments recommends a 0.1 μF ceramic capacitor placed within 3 mm of the VCC pin (Pin 14) and GND (Pin 7), as shown in Figure 7-1 layout example. For improved broadband noise suppression, a parallel 1 μF capacitor is acceptable. This requirement is derived from Section 7.1 Power Supply Recommendations and validated in thermal and EMI testing per automotive EMC standards.
How does the SN74AHC125Q handle unused inputs?
All unused inputs on the SN74AHC125Q - including OE and A pins - must be tied to VCC or GND per Section 7.2.1 Layout Guidelines. Floating inputs cause undefined logic states, increased ICC, and potential oscillation. For example, unused OE pins should connect to VCC via pullup to ensure default high-Z output; unused A inputs may tie to GND or VCC depending on desired default output state.
SN74AHC125QDRG4 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:
- Discontinued at Digi-Key
- 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
SN74AHC125QDRG4 FAQ
1.How can I place an order for SN74AHC125QDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC125QDRG4 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 SN74AHC125QDRG4 reliable?
The price and inventory of SN74AHC125QDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC125QDRG4 is usually 5 days.
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SN74AHC125QDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC125QDRG4 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 SN74AHC125QDRG4?
For technical support, including SN74AHC125QDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC125QDRG4 requirements.
6.How does Aetrix verify that SN74AHC125QDRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC125QDRG4 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 SN74AHC125QDRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC125QDRG4?
All SN74AHC125QDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC125QDRG4, 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 SN74AHC125QDRG4 part is unused and in its original packaging.
Return procedure for SN74AHC125QDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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