My Inquiry
My Account
Texas Instruments SN74HC257DE4
- Part No.:
- SN74HC257DE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HC257DE4.pdf
- Description:
- IC SELECTOR/MUX QD 2-1 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HC257DE4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer with non-inverted 3-state outputs, operating from 2 V to 6 V supply, delivering 9 ns typical propagation delay at 4.5 V, ±6 mA output drive, and 80 µA max ICC - used for bus interface and signal routing in industrial control logic and digital instrumentation systems.
For engineers reviewing the SN74HC257DE4 datasheet, SN74HC257DE4 pinout, SN74HC257DE4 application, or SN74HC257DE4 equivalent, this page delivers verified functional modes, switching characteristics under 50 pF load, thermal metrics for SOIC-16, and precise pin-level design meaning - critical for multiplexer selection in high-density PCBs requiring low-power, noise-immune data path control.
Technical Context
The SN74HC257DE4 implements four independent 2:1 multiplexers sharing common address (A/B) and active-low enable (G) inputs. Each channel selects between two input sources (A or B) and drives a non-inverting 3-state output (Y), with G high forcing all Y outputs into high-impedance state - enabling shared bus arbitration without external gating logic.
Its CMOS HC-family architecture ensures TTL-compatible input thresholds, rail-to-rail output swing, and low input current (≤1 µA). Propagation delay varies with VCC and load: 25 ns max at 4.5 V/50 pF, 32 ns max at 4.5 V/150 pF, and disable/enable times ≤38 ns - supporting reliable timing in synchronous logic interfaces up to ~20 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system integration (e.g., 3.3 V logic interfacing with 5 V legacy peripherals) |
| Propagation Delay (tpd) | 25 ns max at VCC = 4.5 V, CL = 50 pF - enables clean sampling of 20-MHz clocked data streams without setup/hold violation |
| Output Drive | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads or terminate short PCB traces without buffering |
| Quiescent Current (ICC) | 80 µA max at VCC = 6 V - minimizes standby power in battery-backed or energy-sensitive embedded controllers |
| Input Leakage Current | ±1 µA max - prevents unintended logic transitions when inputs are pulled via high-value resistors (e.g., >100 kΩ) |
| 3-State Enable Time (ten) | 38 ns max at VCC = 4.5 V, CL = 50 pF - ensures deterministic bus release timing during multi-device arbitration cycles |
| Power Dissipation Capacitance (Cpd) | 40 pF per multiplexer - allows accurate dynamic power estimation (P = Cpd × V² × f) for thermal budgeting |
Pinout & Package
SN74HC257DE4 is packaged in a 16-pin SOIC (D) with nominal body size 9.90 mm × 3.90 mm, 1.27 mm pitch, and 1.75 mm max height - compatible with standard surface-mount reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 9, 10, 12, 13 | Data Inputs (A0–A3, B0–B3) | Two parallel 4-bit input buses; A-side and B-side signals routed independently to corresponding Y outputs |
| 3, 6, 11, 14 | Outputs (Y0–Y3) | Non-inverted 3-state outputs; each reflects selected A/B input when G = low, high-Z when G = high |
| 7 | GND | Reference ground for all internal logic and output drivers; must be low-impedance connection to minimize noise coupling |
| 8 | VCC | Primary power supply (2–6 V); requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin |
| 15 | G (Active-Low Enable) | Global 3-state control; high forces all Y outputs into high-impedance - essential for bus contention avoidance |
| 16 | A/B (Address Select) | Common select line determining whether A-inputs (A = low) or B-inputs (A = high) appear at Y outputs |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range (2–6 V) | Enables direct interoperability across 3.3 V microcontrollers, 5 V analog front-ends, and mixed-signal SoC interfaces |
| Non-Inverted 3-State Outputs | Preserves signal polarity while allowing multiple SN74HC257DE4 devices to share a single data bus without inversion logic |
| Low Propagation Delay Variation | tpd spread ≤5 ns across channels at 4.5 V/50 pF - ensures simultaneous data routing critical for parallel bus applications |
| High-Noise-Immunity Inputs | VIH = 3.15 V / VIL = 1.35 V at VCC = 4.5 V - provides ≥1.1 V noise margin against EMI in industrial environments |
| Controlled Output Transition Times | tt ≤15 ns at VCC = 4.5 V - limits di/dt-induced crosstalk and EMI in dense routing layouts |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Signal Routing |
|---|---|
|
Use Scenario: Multiplexing sensor inputs (temperature, pressure, flow) from multiple field modules onto a single ADC channel in a programmable logic controller. IC Role / Device Role / Timing Role: Data selector routing analog multiplexer control lines and digitized feedback paths under CPU command. Use Value: Reduces component count vs. discrete gate solutions; 9 ns tpd ensures synchronization with 20-MHz scan cycles without pipeline stalls. |
Use Scenario: Switching between calibration reference signals and DUT outputs during automated test sequence execution. IC Role / Device Role / Timing Role: High-speed signal path selector enabling sub-100 ns reconfiguration of measurement channels. Use Value: ±6 mA drive supports direct connection to 50 Ω test fixtures; 3-state outputs prevent back-driving during channel switching. |
| Embedded Microcontroller Bus Interface | Legacy System Data Bridge |
|
Use Scenario: Connecting multiple peripheral ICs (SPI flash, UART transceivers, GPIO expanders) to a microcontroller's limited GPIO bank. IC Role / Device Role / Timing Role: Logic-level multiplexer enabling time-shared access to shared data/address lines. Use Value: 2 V–6 V operation accommodates both 3.3 V MCUs and 5 V peripherals; low ICC extends battery life in portable instruments. |
Use Scenario: Adapting 8-bit ISA bus signals to modern FPGA-based controller interfaces in retro-computing restoration projects. IC Role / Device Role / Timing Role: Bidirectional data path arbiter translating legacy strobe/control timing to synchronous logic domains. Use Value: Non-inverted outputs preserve original signal polarity; 25 ns max tpd meets ISA's 150 ns access window requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC157N | Identical function and pinout; PDIP-16 package only; no SOIC variant available | Suitable for through-hole prototyping or legacy board rework where SOIC footprint is unavailable | Select SN74HC157N only when PDIP mounting is required; SN74HC257DE4 offers superior thermal performance (RθJA = 73°C/W vs. 67°C/W) in SOIC |
| 74LVC157APW | Lower VCC range (1.65–3.6 V); 3.3 V optimized; 4.2 ns tpd at 3.3 V/50 pF | Better suited for ultra-low-voltage, high-speed FPGA I/O banks but incompatible with 5 V systems | Choose 74LVC157APW for 3.3 V-only designs demanding <5 ns delay; SN74HC257DE4 remains optimal for 2–6 V flexibility and 5 V tolerance |
Compared with SN74HC157N and 74LVC157APW, SN74HC257DE4 uniquely balances wide voltage operation, SOIC thermal efficiency, and proven reliability in industrial temperature ranges - making it the preferred choice for mixed-voltage, space-constrained, and thermally demanding multiplexer deployments.
Availability
SN74HC257DE4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74HC257DE4 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 logic ICs, with over 50 years of innovation in high-reliability logic families.
The SN74HC257DE4 belongs to TI's 74HC logic series - designed for robust, low-power, wide-supply digital signal routing in industrial, automotive, and communications infrastructure where noise immunity and thermal stability are critical.
FAQ
What is the maximum operating frequency supported by SN74HC257DE4?
The SN74HC257DE4 does not specify a maximum clock frequency, but its 25 ns maximum propagation delay at 4.5 V/50 pF implies reliable operation up to ~20 MHz in synchronous data routing applications. Actual usable frequency depends on system-level timing margins, including setup/hold requirements of downstream devices and PCB trace delays - always verify with worst-case tpd and system timing analysis.
Can SN74HC257DE4 operate reliably at 3.3 V?
Yes, SN74HC257DE4 operates reliably at 3.3 V: VIH = 2.31 V min and VIL = 0.99 V max per datasheet, providing 1.32 V noise margin. Its 9 ns typical tpd and ±4 mA output drive at 3.3 V make it fully compatible with 3.3 V microcontrollers and FPGAs - confirmed across commercial temperature range (−40°C to +85°C).
Is SN74HC257DE4 pin-compatible with SN74HC157?
Yes, SN74HC257DE4 is functionally and pin-compatible with SN74HC157 in SOIC-16 (D) and PDIP-16 (N) packages. Both share identical pin assignments, truth table, and electrical characteristics. However, SN74HC257DE4 is the TI-qualified catalog version with full production status and documented thermal metrics - SN74HC157 may refer to legacy or alternate marking variants.
How should the G (enable) pin be handled during power-up?
To ensure outputs remain in high-impedance state during power-up, tie G to VCC via a pullup resistor. TI recommends minimum resistance based on driver sink capability; a 10 kΩ resistor is typical. This prevents bus contention before firmware initializes the device - critical in systems with multiple 3-state devices sharing a common data path.
Does SN74HC257DE4 support hot insertion or live bus swapping?
No, SN74HC257DE4 is not rated for hot insertion. Its absolute maximum ratings do not include powered-insertion stress conditions, and the 3-state outputs lack bus-hold or Ioff protection. For live-swappable applications, use dedicated hot-swap controllers or logic families with Ioff specification (e.g., TI's 74LVC series) - SN74HC257DE4 requires power stabilization before signal assertion.
SN74HC257DE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74HC257DE4 FAQ
1.How can I place an order for SN74HC257DE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC257DE4 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 SN74HC257DE4 reliable?
The price and inventory of SN74HC257DE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC257DE4 is usually 5 days.
3.What payment methods are accepted for SN74HC257DE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC257DE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC257DE4?
SN74HC257DE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC257DE4 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 SN74HC257DE4?
For technical support, including SN74HC257DE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC257DE4 requirements.
6.How does Aetrix verify that SN74HC257DE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC257DE4 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 SN74HC257DE4 meets industry standards.
7.What is the process for return or replacement of SN74HC257DE4?
All SN74HC257DE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC257DE4, 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 SN74HC257DE4 part is unused and in its original packaging.
Return procedure for SN74HC257DE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HC257DE4 Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
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…
