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Texas Instruments SN74AHC125QDRQ1
- Part No.:
- SN74AHC125QDRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHC125QDRQ1.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,494
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Product details
Overview
SN74AHC125QDRQ1 from Texas Instruments is an automotive-qualified 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 delivering 8 ns typical propagation delay at 5 V with 15 pF load - used in programmable logic controllers and motor drive control interfaces.
For engineers reviewing the SN74AHC125QDRQ1 datasheet, SN74AHC125QDRQ1 pinout, SN74AHC125QDRQ1 application, or SN74AHC125QDRQ1 equivalent, this page provides verified functional mode behavior, SOIC-14 package mapping, automotive-grade ESD ratings (±2000 V HBM), and validated alternative options for industrial bus buffering in safety-critical embedded systems.
Technical Context
The SN74AHC125QDRQ1 implements four independent CMOS buffer channels, each with active-low output-enable (OE) control enabling high-impedance state during power sequencing. Its EPIC™ process ensures latch-up immunity exceeding 250 mA per JESD17 and stable operation under automotive transients.
Each channel passes A-input to Y-output when OE is low; all outputs enter high-Z when OE is high. Input thresholds scale with VCC (VIH = 3.85 V min at 5.5 V, VIL = 1.65 V max), and output drive strength is ±8 mA at 5 V - sufficient for driving multiple CMOS loads on shared buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports dual-rail systems and brown-out tolerant operation in 3.3 V and 5 V automotive domains. |
| Operating Temperature | −40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for engine bay and chassis-mounted ECUs. |
| tPLH / tPHL (5 V, 15 pF) | 3.8 ns min / 6.5 ns max - enables reliable timing in 100+ MHz bus applications with margin. |
| IOL / IOH (5 V) | ±8 mA - drives up to 10 standard CMOS inputs or one TTL load without external buffering. |
| ESD Rating (HBM) | ±2000 V - meets AEC-Q100-002 Level 2 for robust handling in automated assembly and field service. |
| ICC (5.5 V) | 4 μA typical - ultra-low static current enables always-on monitoring circuits without battery drain. |
| Input Capacitance (Ci) | 4 pF - minimizes signal integrity degradation and loading on upstream drivers. |
Pinout & Package
SN74AHC125QDRQ1 is supplied in a 14-pin SOIC (D) package measuring 8.65 mm × 6 mm, with 1.27 mm lead pitch and 1.75 mm maximum height. The thermal pad is absent - no exposed die attach pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OE, 4 OE, 8 OE, 13 OE | Active-low output enable | Controls individual buffer output state; tie high via pullup to ensure high-Z at power-up. |
| 2 A1, 5 A2, 9 A3, 12 A4 | Buffer input | CMOS-compatible data input; must be held at VCC or GND if unused to prevent floating node oscillation. |
| 3 Y1, 6 Y2, 10 Y3, 11 Y4 | Buffer output | 3-state CMOS output; sinks or sources up to ±8 mA at 5 V, compatible with 5 V TTL and 3.3 V LVTTL. |
| 7 GND | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance PCB connection. |
| 14 VCC | Power supply | Single-supply rail for all buffers; decoupling capacitor (0.1 μF ceramic) required within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from −40 °C to +125 °C ambient, including temperature cycling and humidity testing. |
| Independent 3-state control per channel | Enables selective bus isolation without affecting other channels - critical for multi-master arbitration and hot-swap support. |
| EPIC™ process technology | Delivers latch-up immunity >250 mA and reduced leakage versus standard CMOS, improving system reliability in noisy environments. |
| Scalable input thresholds | VIH/VIL track VCC (e.g., VIH = 3.85 V at VCC = 5.5 V), ensuring noise margin consistency across supply variations. |
| Low dynamic power dissipation | Cpd = 14 pF - reduces switching current and EMI in high-frequency bus applications like PoE controller interfaces. |
Applications
| Programmable Logic Controllers | Motor Drive Control Interfaces |
|---|---|
Use Scenario: Isolating I/O expansion modules from main CPU bus during firmware updates or fault recovery. IC Role / Device Role / Timing Role: Bus buffer with per-channel 3-state control enables selective module disconnection without halting entire system. Use Value: Prevents bus contention and data corruption during hot-plug operations while maintaining deterministic timing with sub-7 ns propagation delay. |
Use Scenario: Level-shifting and isolating position encoder signals between 5 V sensor and 3.3 V MCU in BLDC motor controllers. IC Role / Device Role / Timing Role: Bidirectional buffer with scalable VIH/VIL thresholds adapts to mixed-voltage sensor interface requirements. Use Value: Eliminates need for discrete level translators; ±8 mA drive strength sustains signal integrity over 15 cm PCB traces at 100 kHz encoder rates. |
| Power over Ethernet (PoE) Controllers | Electronic Point-of-Sale Terminals |
Use Scenario: Managing communication between PoE PSE controller and PD detection circuitry across isolated domains. IC Role / Device Role / Timing Role: Low-capacitance (4 pF) buffer isolates high-noise power detection logic from sensitive data lines. Use Value: Reduces crosstalk-induced false detection events; 2000 V HBM rating withstands ESD events common in Ethernet port handling. |
Use Scenario: Buffering keypad scan matrix signals in retail terminals exposed to frequent operator contact and ESD events. IC Role / Device Role / Timing Role: Automotive-qualified 3-state gate provides robust front-panel I/O interfacing with fail-safe high-Z default state. Use Value: Ensures keypad remains electrically isolated during boot-up; −40 °C to +125 °C rating covers extended storage and kiosk deployment in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffering applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV125AQPWRQ1 | Lower VCC range (1.65 V–5.5 V); higher input capacitance (5.5 pF); 10 ns max tPLH at 3.3 V. | Better suited for 1.8 V logic domains but less optimal for legacy 5 V industrial buses. | Select when interfacing with LVCMOS peripherals; verify timing margins at 3.3 V due to slower edge rates. |
| SN74AHC244QDRQ1 | Octal configuration; identical VCC/temperature specs; 2x propagation delay variation due to longer internal routing. | Used where 8-bit parallel data paths require consolidation; not drop-in for 4-channel designs. | Choose for wider bus architectures; requires PCB layout revision due to different pinout and larger footprint. |
Compared with SN74AHC125QDRQ1, SN74LV125AQPWRQ1 offers lower-voltage compatibility at the cost of speed and noise margin, while SN74AHC244QDRQ1 scales channel count but increases propagation uncertainty - making SN74AHC125QDRQ1 optimal for compact, deterministic 4-channel automotive bus isolation.
Availability
SN74AHC125QDRQ1 is available at Aetrix Electronics and suitable for programmable logic controllers, motor drive control interfaces, and Power over Ethernet (PoE) controllers requiring stable component supply across automotive production lifecycles.
Supply support for SN74AHC125QDRQ1 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-grade logic solutions, with over 50 years of innovation in high-reliability IC design.
The SN74AHC125QDRQ1 belongs to TI's automotive AHC logic family, engineered for robust bus buffering in harsh environments - targeting ECU, body control, and powertrain subsystems demanding AEC-Q100 compliance and long-term supply stability.
FAQ
What is the recommended power-up sequence for SN74AHC125QDRQ1?
TI recommends tying all OE pins to VCC through a pullup resistor (≤10 kΩ) at power-up to force outputs into high-impedance state before logic levels stabilize. This prevents bus contention during VCC ramp. The SN74AHC125QDRQ1's EPIC™ process ensures no damage occurs even if OE floats briefly, but controlled sequencing guarantees deterministic behavior in automotive ECUs.
Does SN74AHC125QDRQ1 support mixed-voltage operation between input and output sides?
No - SN74AHC125QDRQ1 is a single-supply device with all I/O referenced to the same VCC rail. Inputs and outputs operate within 0 V to VCC, so it cannot translate between, e.g., 3.3 V and 5 V domains. For level shifting, use dedicated translators like TXB0104; SN74AHC125QDRQ1 functions strictly as a buffered repeater within one voltage domain.
How does the latch-up immunity of SN74AHC125QDRQ1 impact system-level reliability?
SN74AHC125QDRQ1 exceeds 250 mA latch-up immunity per JESD17, meaning it withstands transient current surges caused by ground bounce or supply glitches without destructive failure. In motor drive applications, this protects against shoot-through-induced current spikes on shared PCB planes - a key reliability factor validated under AEC-Q100 stress testing.
Can unused inputs on SN74AHC125QDRQ1 be left floating?
No - all unused inputs (A1–A4, OE1–OE4) must be tied to VCC or GND. Floating CMOS inputs cause increased ICC, unpredictable output states, and potential oscillation that raises EMI and thermal stress. TI's application report SCBA004 confirms this requirement applies to SN74AHC125QDRQ1 and is enforced in automotive qualification testing.
What is the thermal resistance (RθJA) of SN74AHC125QDRQ1 in SOIC package?
The SN74AHC125QDRQ1 in SOIC (D) package has RθJA = 86 °C/W, measured under JEDEC-standard conditions (1s2p board). This value assumes standard 2-layer PCB with 1 in² copper pour under the package. For high-power-density layouts, derate output current or add thermal vias - TI specifies 125 °C max junction temperature, limiting continuous operation at full drive strength above 85 °C ambient.
SN74AHC125QDRQ1 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74AHC125QDRQ1 FAQ
1.How can I place an order for SN74AHC125QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC125QDRQ1 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 SN74AHC125QDRQ1 reliable?
The price and inventory of SN74AHC125QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC125QDRQ1 is usually 5 days.
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SN74AHC125QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC125QDRQ1 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 SN74AHC125QDRQ1?
For technical support, including SN74AHC125QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC125QDRQ1 requirements.
6.How does Aetrix verify that SN74AHC125QDRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHC125QDRQ1 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 SN74AHC125QDRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHC125QDRQ1?
All SN74AHC125QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC125QDRQ1, 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 SN74AHC125QDRQ1 part is unused and in its original packaging.
Return procedure for SN74AHC125QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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