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STMicroelectronics 74VHC257MTR
- Part No.:
- 74VHC257MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74VHC257MTR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,654
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Product details
Overview
74VHC257MTR from STMicroelectronics is a quad 2-channel non-inverting multiplexer with 3-state outputs, designed for high-speed data routing in 2V–5.5V logic systems. It features 3.7ns typical propagation delay at 5V, ±8mA symmetrical output drive, and input tolerance up to 7V independent of VCC. Used in bus multiplexing, signal selection, and level-shifting between 3V and 5V domains.
For engineers reviewing the 74VHC257MTR datasheet, 74VHC257MTR pinout, 74VHC257MTR application, or 74VHC257MTR equivalent, this page delivers verified electrical parameters, truth-table-validated switching behavior, package-specific thermal and mechanical data, and real-world interface design guidance for mixed-voltage digital systems.
Technical Context
The 74VHC257 implements four independent 2:1 multiplexers sharing one common SELECT and one active-low ENABLE (OE) input. Each channel selects between A and B inputs based on SELECT state and drives a 3-state output (Y), with high-impedance asserted when OE is high.
It uses sub-micron C2MOS technology enabling rail-to-rail input tolerance (0–7V), 2kV ESD protection, and latch-up immunity. Propagation delays are balanced (tPLH ≅ tPHL), and output impedance is symmetrical-critical for clean bus arbitration and bidirectional signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPD) | 3.7ns typical at VCC = 5V - enables ≤270MHz data routing in critical timing paths |
| Supply Voltage Range | 2V to 5.5V - supports direct interfacing between 3.3V and 5V logic domains without level shifters |
| Output Drive Strength | ±8mA minimum - ensures robust fan-out to ≥10 LS-TTL loads or 20 CMOS loads |
| Input Voltage Tolerance | 0V to 7V regardless of VCC - allows hot-plug-safe operation and mixed-supply input handling |
| Quiescent Current | 4µA max at 25°C - reduces standby power in battery-backed or low-power control subsystems |
| ESD Immunity | 2kV HBM - meets IEC 61000-4-2 Level 2 for industrial board-level reliability |
| Operating Temperature | −55°C to +125°C - qualified for automotive under-hood and industrial motor-control environments |
Pinout & Package
74VHC257MTR is supplied in a 16-pin SOIC (Small Outline Integrated Circuit) tape-and-reel package (SO-16), compliant with JEDEC MS-012, with 1.27mm pitch and body dimensions 9.8 × 5.8 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SELECT | Common 2:1 channel select for all four multiplexers; low = A selected, high = B selected |
| 2,5,11,14 | 1A–4A | Data inputs from Source A; tolerate 0–7V regardless of VCC |
| 3,6,10,13 | 1B–4B | Data inputs from Source B; identical voltage tolerance and noise immunity as A inputs |
| 4,7,9,12 | 1Y–4Y | 3-state non-inverting outputs; high-impedance when OE = high |
| 15 | OE | Active-low output enable; disables all Y outputs simultaneously into high-Z state |
| 8 | GND | Digital ground reference; decoupling required within 5mm of VCC pin |
| 16 | VCC | Positive supply (2–5.5V); powers internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Power-down input protection | All inputs accept 0–7V regardless of VCC state - prevents back-driving and latch-up during power sequencing |
| Symmetrical output drive | |IOH| = IOL ≥ 8mA - eliminates skew in bidirectional bus arbitration and ensures matched rise/fall times |
| High noise immunity | VNIH/VNIL ≥ 28% VCC - rejects >1.4V noise on 5V systems and >0.56V on 2V systems without false triggering |
| Low dynamic noise | VOLP ≤ 0.8V at CL = 50pF - suppresses ground bounce in dense PCB layouts with multiple switching outputs |
| Pin-compatible upgrade | Drop-in replacement for 74LS257 and 74HC257 - retains legacy board layout while improving speed and power efficiency |
Applications
| Industrial PLC I/O Multiplexing | Automotive Body Control Module |
|---|---|
|
Use Scenario: Routing sensor inputs (temperature, pressure, position) to a single ADC channel across multiple zones. IC Role / Device Role / Timing Role: Quad 2:1 selector consolidates 8 analog sensor signals onto 4 ADC inputs using shared SELECT/OE control. Use Value: Reduces component count by 50% vs discrete mux ICs and maintains <5ns inter-channel skew for synchronized sampling. |
Use Scenario: Selecting between dashboard display data and infotainment audio status signals for shared CAN transceiver diagnostics line. IC Role / Device Role / Timing Role: Level-shifting multiplexer interfaces 3.3V microcontroller GPIOs to 5V legacy cluster hardware. Use Value: Eliminates external level translators; 7V-tolerant inputs survive load-dump transients without clamping diodes. |
| Test Equipment Signal Switching | Medical Patient Monitor Data Aggregation |
|
Use Scenario: Dynamically reconfiguring probe connections across multiple DUTs in automated test fixtures. IC Role / Device Role / Timing Role: High-speed 3-state outputs isolate unused channels, preventing signal contention during reconfiguration. Use Value: 3.7ns tPD enables ≤270MHz switching rate; 2kV ESD rating protects against operator-induced discharge during manual probing. |
Use Scenario: Aggregating ECG, SpO₂, and NIBP waveforms onto a shared serial interface before encryption and wireless transmission. IC Role / Device Role / Timing Role: Non-inverting multiplexer preserves signal polarity and timing integrity across multi-source analog front-ends. Use Value: Balanced tPLH/tPHL (<0.3ns mismatch) ensures waveform fidelity; −55°C to +125°C rating supports sterilization cycles. |
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 |
|---|---|---|---|
| 74HC257D,653 (Nexperia) | Slower tPD = 17ns @ 5V; lower drive (±5.2mA); no 7V input tolerance | Limited to single-supply 5V systems; unsuitable for hot-swap or mixed-voltage routing | Choose for cost-sensitive, non-critical timing designs where VCC = 5V only |
| SN74LV257APWR (TI) | Wider VCC range (1.65–5.5V); lower ICC = 2µA; but asymmetric drive (IOH = 12mA, IOL = 16mA) | Better for ultra-low-power battery operation; asymmetry may induce timing skew in bidirectional buses | Prefer for portable medical devices needing extended battery life; verify skew impact in time-critical paths |
Compared with 74HC257D and SN74LV257APWR, the 74VHC257MTR uniquely combines 3.7ns speed, 7V input tolerance, and symmetrical ±8mA drive-making it optimal for industrial and automotive multiplexing where voltage robustness and timing precision are jointly critical.
Availability
74VHC257MTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body controllers, automated test equipment, and medical patient monitors requiring stable component supply across extended temperature and mixed-voltage operating conditions.
Supply support for 74VHC257MTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with vertical manufacturing and AEC-Q100 qualification capabilities.
The VHC logic family targets high-speed, low-power CMOS applications demanding rail-to-rail input tolerance, enhanced ESD resilience, and compatibility with legacy TTL/CMOS systems-particularly in harsh-environment control and instrumentation.
FAQ
Can 74VHC257MTR operate with VCC = 3.3V while accepting 5V inputs?
Yes. The device supports VCC from 2V to 5.5V and tolerates input voltages from 0V to 7V irrespective of supply level. At VCC = 3.3V, 5V signals on A/B/SELECT/OE pins are safely accepted without damage or logic corruption due to integrated input protection circuitry and C2MOS process design.
What is the maximum capacitive load the outputs can drive while maintaining specified tPD?
The AC specifications guarantee tPD ≤ 7.0ns (max) at VCC = 5V with CL = 15pF, and ≤ 9.0ns with CL = 50pF. Driving >50pF increases propagation delay nonlinearly and may exceed timing budgets; for heavier loads, add series termination or buffer stages per STMicroelectronics AN2012 guidelines.
Is the 74VHC257MTR pinout compatible with standard SO-16 footprints?
Yes. It uses JEDEC-standard SO-16 (MS-012) mechanical dimensions: 9.8 × 5.8 mm body, 1.27mm lead pitch, and 1.75mm height. Footprint matches IPC-7351B SOIC16_NOMINAL, including pad width (0.46mm), length (1.5mm), and courtyard clearance (0.25mm).
How does the power-down protection affect system-level power sequencing?
Inputs remain high-impedance and non-destructive across full 0–7V range even when VCC = 0V. This allows safe "live" insertion of daughterboards or hot-swapping of sensors without risk of back-powering or latch-up-enabling robust power sequencing in modular industrial controllers.
74VHC257MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74VHC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- 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:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74VHC257MTR FAQ
1.How can I place an order for 74VHC257MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC257MTR 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 74VHC257MTR reliable?
The price and inventory of 74VHC257MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC257MTR is usually 5 days.
3.What payment methods are accepted for 74VHC257MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC257MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC257MTR?
74VHC257MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC257MTR 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 74VHC257MTR?
For technical support, including 74VHC257MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC257MTR requirements.
6.How does Aetrix verify that 74VHC257MTR is sourced from the original manufacturer or authorized distributors?
All 74VHC257MTR 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 74VHC257MTR meets industry standards.
7.What is the process for return or replacement of 74VHC257MTR?
All 74VHC257MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC257MTR, 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 74VHC257MTR part is unused and in its original packaging.
Return procedure for 74VHC257MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74VHC257MTR 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
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