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Texas Instruments SN74AHC257QPWRQ1
- Part No.:
- SN74AHC257QPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC257QPWRQ1.pdf
- Description:
- AUTOMOTIVE QUADRUPLE 2-INPUT MUL
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
SN74AHC257QPWRQ1 from Texas Instruments is an automotive-grade quad 2-input data selector/multiplexer with three-state non-inverting outputs, operating from 2V to 5.5V VCC, delivering ≤9.5ns propagation delay at 5V/50pF, rated for −40°C to +125°C, and qualified per AEC-Q100 Grade 1 for engine control and ADAS signal routing.
For engineers reviewing the SN74AHC257QPWRQ1 datasheet, SN74AHC257QPWRQ1 pinout, SN74AHC257QPWRQ1 application, or SN74AHC257QPWRQ1 equivalent, this page delivers verified package mapping (TSSOP-16), functional truth table, switching characteristics across temperature/voltage, ESD ratings (HBM ±2kV, CDM ±1kV), and automotive thermal performance (RθJA = 135.9°C/W).
Technical Context
The SN74AHC257QPWRQ1 integrates four independent 2:1 multiplexers sharing a common A/B select line and active-low OE control, enabling simultaneous channel selection and bus-oriented 3-state output enable/disable. Its balanced CMOS 3-state outputs support bidirectional bus driving with matched high/low drive strength (±8mA at 5V) and leakage-limited high-impedance state (±5µA).
It employs standard CMOS inputs requiring fast transitions (≤20 ns/V at 5V) to prevent oscillation, includes internal clamp diodes on all I/Os, and supports wettable-flank inspection in QFN variants-though the QPWRQ1 suffix confirms TSSOP-16 packaging without wettable flanks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - supports mixed-voltage system interfacing (e.g., 3.3V microcontroller controlling 5V peripherals) |
| Propagation Delay | ≤9.5ns max at VCC = 5V, CL = 50pF - enables reliable timing in 100+ MHz data path switching |
| Output Drive | ±8mA at VCC = 5V - sufficient to drive multiple 74AHC inputs or light capacitive loads without external buffers |
| Operating Temp | −40°C to +125°C - meets automotive powertrain and chassis module ambient requirements |
| ESD Rating | HBM ±2000V, CDM ±1000V - exceeds AEC-Q100-002/-011 Level 2/C4B for robust assembly and field operation |
| Input Capacitance | 10pF max - minimizes loading on upstream drivers and preserves signal edge integrity |
| Supply Current | 40µA max at VCC = 5.5V - enables low-quiescent-power operation in always-on vehicle networks |
Pinout & Package
Packaged in 16-pin TSSOP (PW), 6.4mm × 5mm body size, with gull-wing leads optimized for automated optical inspection and reflow soldering in automotive PCB assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | A/B, OE | Shared select (A/B) and active-low output enable (OE) - global control of all four channels |
| 2–3, 5–6, 11, 14, 10, 13 | 1A/1B, 2A/2B, 3A/3B, 4A/4B | Eight data inputs - two per channel, supporting independent source selection per 2:1 mux |
| 4, 7, 9, 12 | 1Y, 2Y, 3Y, 4Y | Four 3-state non-inverting outputs - each floats to high-impedance when OE = HIGH |
| 8, 16 | GND, VCC | Power rails - decoupling capacitor must be placed adjacent to Pin 16 (VCC) and Pin 8 (GND) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use up to +125°C junction temperature, including HTOL and temperature cycling |
| Three-state outputs with balanced drive | Enables time-multiplexed bus sharing without contention; ±8mA drive ensures clean logic levels into 50pF loads |
| Low input transition rate sensitivity | Specified ≤20 ns/V at 5V - prevents metastability and excessive current draw during slow-edge signals |
| Clamp diode protection | Integrated negative clamps on all inputs and bidirectional clamps on outputs - limits transients to ±0.5V beyond rails |
| Latch-up immunity | Exceeds 250mA per JESD17 - withstands transient overcurrent events in noisy vehicle electrical systems |
Applications
| Engine Control Unit (ECU) Signal Routing | Advanced Driver Assistance Systems (ADAS) Sensor Multiplexing |
|---|---|
Use Scenario: Selecting between crankshaft and camshaft position sensor signals before feeding to MCU ADC or timer capture unit. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing deterministic, low-latency analog sensor signal selection under real-time engine timing constraints. Use Value: Enables dual-sensor redundancy architecture with single MCU input channel, reducing BOM count and PCB routing complexity while maintaining <10ns timing margin. | Use Scenario: Time-division multiplexing of radar echo data streams from multiple front-corner radar modules onto a shared CAN FD or Ethernet AVB interface. IC Role / Device Role / Timing Role: Data selector synchronizing burst-mode radar returns to a centralized processor with precise channel alignment via shared A/B and OE control. Use Value: Eliminates need for separate GPIO-per-radar design; 9.5ns delay ensures sub-microsecond sample alignment critical for beamforming accuracy. |
| Automotive Infotainment Display Interface | Body Control Module (BCM) I/O Expansion |
Use Scenario: Switching between primary display controller and backup graphics processor outputs to a single LVDS transmitter during failover events. IC Role / Device Role / Timing Role: Quad non-inverting multiplexer routing parallel RGB/HS/VS video signals with simultaneous channel enable via OE. Use Value: Achieves seamless display switchover in <15ns with no bus contention, meeting ISO 26262 ASIL-B diagnostic response time requirements. | Use Scenario: Expanding limited MCU GPIO count to manage 8 discrete door-lock actuator control lines using two SN74AHC257QPWRQ1 devices. IC Role / Device Role / Timing Role: Logic-level translator and signal selector enabling software-configurable actuator grouping and diagnostics sequencing. Use Value: Reduces MCU pin count by 50% versus direct drive; 3-state outputs allow safe sharing of driver-stage MOSFET gates without hardware interlocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV257AQPWRQ1 | Lower VCC range (1.65V–5.5V); higher VOL (0.55V @ 24mA) and slower tPHL (13.5ns @ 5V/50pF) | Better suited for 1.8V logic domains; less drive capability limits fanout in 5V systems | Select when interfacing with LVCMOS peripherals or where lower static power (<10µA ICC) is prioritized over speed |
| MC74VHC257DTG | Non-automotive grade; no AEC-Q100 qualification; wider VCC (2V–5.5V) but only rated to 85°C ambient | Not suitable for powertrain or safety-critical modules; acceptable for cabin infotainment or telematics | Choose for cost-sensitive non-safety applications where automotive qualification is not required |
Compared with SN74LV257AQPWRQ1, the SN74AHC257QPWRQ1 provides faster switching and stronger drive for 5V bus loading; versus MC74VHC257DTG, it delivers guaranteed operation at 125°C and full AEC-Q100 traceability-critical for ASIL-B system integration.
Availability
SN74AHC257QPWRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS sensor hubs, infotainment display failover circuits, and body control modules requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for SN74AHC257QPWRQ1 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 manufacturing scale.
The SN74AHC257QPWRQ1 belongs to TI's AHC logic family designed specifically for high-speed, low-power, automotive-qualified signal routing in safety-critical electronic control units and sensor interfaces.
FAQ
What is the maximum capacitive load the SN74AHC257QPWRQ1 can drive while maintaining specified timing?
The SN74AHC257QPWRQ1 is characterized for loads up to 50pF, with all switching specifications (e.g., tPHL ≤ 9.5ns at 5V) guaranteed under that condition. Driving >50pF increases propagation delay nonlinearly and may violate setup/hold margins in high-speed interfaces. For heavier loads, buffer stages or layout optimization (shorter traces, reduced parallelism) are recommended. The SN74AHC257QPWRQ1 datasheet explicitly states "not recommended to exceed 50pF" in Section 8.3.1.
Does the SN74AHC257QPWRQ1 support hot insertion or live bus swapping?
No, the SN74AHC257QPWRQ1 does not support hot insertion. Its absolute maximum ratings specify VI and VO limits of –0.5V to 7V, but the device lacks bus-hold or power-up 3-state features. Applying signal or supply voltage before VCC stabilization risks latch-up or damage due to uncontrolled current paths through internal clamps. System-level hot-swap protection requires external circuitry such as ideal diodes or dedicated hot-swap controllers.
How does the SN74AHC257QPWRQ1 handle unused inputs and outputs?
Unused inputs on the SN74AHC257QPWRQ1 must be terminated to VCC or GND-never left floating-to prevent oscillation and excess power consumption. Unused outputs may be left disconnected (floating) since they enter high-impedance state when OE is inactive; however, if connected to a shared bus, pull-up/down resistors (e.g., 10kΩ) should be used to define idle voltage. This guidance is specified in Sections 7.3.2 and 8.3.3 of the SN74AHC257QPWRQ1 datasheet.
What is the thermal performance difference between the TSSOP and WQFN packages of the SN74AHC257-Q1 family?
The SN74AHC257QPWRQ1 uses the PW (TSSOP-16) package with RθJA = 135.9°C/W, while the WBQB (WQFN-16) variant has RθJA = 105.6°C/W-30.3°C/W lower-due to superior thermal pad conduction. Both share identical silicon die and electrical specs, but the WQFN's exposed thermal pad (connected to GND) improves heat dissipation in thermally constrained layouts. The QPWRQ1 suffix explicitly denotes TSSOP packaging, so thermal design must account for its higher junction-to-ambient resistance.
Can the SN74AHC257QPWRQ1 be used in a level-shifting configuration between 3.3V and 5V domains?
Yes, the SN74AHC257QPWRQ1 supports level shifting when powered at the destination domain's VCC. For example, with VCC = 5V, it accepts 3.3V-tolerant inputs (VIH min = 3.85V at VCC = 5.5V, but VIH = 2.1V at VCC = 3V per Recommended Operating Conditions), and outputs swing rail-to-rail (VOH ≥ 4.9V, VOL ≤ 0.1V). However, bidirectional translation requires external direction control; the SN74AHC257QPWRQ1 is unidirectional and best used for 3.3V→5V signal selection, not true bidirectional level shift.
SN74AHC257QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Data Selector/Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 8mA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74AHC257QPWRQ1 FAQ
1.How can I place an order for SN74AHC257QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC257QPWRQ1 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 SN74AHC257QPWRQ1 reliable?
The price and inventory of SN74AHC257QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC257QPWRQ1 is usually 5 days.
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4.How is shipping managed for SN74AHC257QPWRQ1?
SN74AHC257QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC257QPWRQ1 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 SN74AHC257QPWRQ1?
For technical support, including SN74AHC257QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC257QPWRQ1 requirements.
6.How does Aetrix verify that SN74AHC257QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74AHC257QPWRQ1 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 SN74AHC257QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74AHC257QPWRQ1?
All SN74AHC257QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC257QPWRQ1, 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 SN74AHC257QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74AHC257QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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