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STMicroelectronics 74VHC257TTR
- Part No.:
- 74VHC257TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHC257TTR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,964
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Product details
Overview
74VHC257TTR from STMicroelectronics is a quad 2-channel non-inverting multiplexer with 3-state outputs, designed for high-speed data routing in mixed-voltage systems. It operates from 2V to 5.5V, delivers 3.7ns typical propagation delay at 5V, supports 8mA output drive, and features power-down input protection enabling safe 0–7V input tolerance regardless of VCC.
For engineers reviewing the 74VHC257TTR datasheet, 74VHC257TTR pinout, 74VHC257TTR application, or 74VHC257TTR equivalent, key selection criteria include its symmetrical output impedance, balanced tPLH/tPHL delays, latch-up immunity, 2kV ESD protection, and compatibility with legacy 74-series logic interfaces.
Technical Context
The 74VHC257 implements four independent 2:1 multiplexers sharing common SELECT and active-low OE inputs, enabling simultaneous channel selection and output enable control. Its C2MOS fabrication ensures low ICC (4µA max) and high noise immunity (VNIH/VNIL ≥28% VCC), while the non-inverting architecture preserves signal polarity across all channels.
All inputs tolerate voltages up to 7V independent of VCC, allowing robust level-shifting between 3V and 5V domains. The device uses sub-micron silicon gate technology and double-layer metal wiring to achieve fast switching with low dynamic noise (VOLP ≤0.8V) and controlled rise/fall times (0–20 ns/V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPD) | 3.7ns typ. at VCC = 5V - enables <270MHz data routing in critical timing paths |
| Supply Voltage Range | 2V to 5.5V - supports dual-rail operation and 3.3V/5V system interfacing |
| Output Drive | |IOH| = |IOL| = 8mA min. - drives standard TTL loads and multiple CMOS inputs |
| Input Voltage Tolerance | 0V to 7V regardless of VCC - eliminates external clamping for mixed-voltage I/O |
| Quiescent Current | ICC = 4µA max. at TA = 25°C - suitable for battery-backed and low-power standby modes |
| ESD Immunity | 2kV HBM - protects against handling damage without external TVS diodes |
| Operating Temperature | −55°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
TSSOP-16 package: 4.4mm × 5.0mm body, 0.65mm pitch, 1.2mm height, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SELECT | Common select line controlling A/B source choice for all four multiplexers |
| 2,5,11,14 | 1A–4A | Data inputs from Source A; tolerant to 0–7V regardless of VCC |
| 3,6,10,13 | 1B–4B | Data inputs from Source B; same voltage tolerance and ESD protection 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; forces all Y outputs into high-Z state when HIGH |
| 8 | GND | Digital ground reference; decoupling required within 5mm of VCC pin |
| 16 | VCC | Positive supply; must be bypassed with 100nF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Power-down input protection | Accepts 0–7V on all inputs with no current flow or damage, even when VCC = 0V |
| Symmetrical output drive | Matched |IOH| and |IOL| (≥8mA) minimizes duty-cycle distortion in clock/data paths |
| Balanced propagation delays | tPLH ≈ tPHL ensures minimal skew between rising/falling edges in timing-critical muxing |
| High noise immunity | VNIH/VNIL ≥28% VCC provides >1.4V noise margin at 5V supply, reducing false triggering |
| Latch-up immunity | Improved process design prevents destructive latch-up under transient overvoltage conditions |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Multiplexing sensor inputs (temperature, pressure, position) from multiple zones into a single ADC channel. IC Role / Device Role / Timing Role: Quad 2:1 analog/digital signal selector with 3-state outputs enabling shared bus access. Use Value: Reduces PCB trace count by 50% versus discrete routing; 125°C rating ensures reliability in engine bay proximity. | Use Scenario: Routing diagnostic signals (CAN status, lamp feedback, switch states) to microcontroller GPIOs. IC Role / Device Role / Timing Role: Level-shifting multiplexer interfacing 5V sensors and 3.3V MCU with fault-tolerant inputs. Use Value: 0–7V input tolerance eliminates external voltage translators; 2kV ESD withstands vehicle EMI events. |
| Medical Patient Monitor Data Aggregation | Test Equipment Signal Routing |
Use Scenario: Consolidating ECG, SpO₂, and NIBP waveform streams onto a shared digital interface before digitization. IC Role / Device Role / Timing Role: Low-skew, non-inverting multiplexer preserving signal integrity in analog front-end sampling paths. Use Value: 3.7ns tPD and balanced delays prevent timing jitter in synchronized multi-channel acquisition. | Use Scenario: Configurable signal path switching in automated test fixtures for IC functional validation. IC Role / Device Role / Timing Role: Reconfigurable 2:1 data selector enabling flexible stimulus/response routing between DUT and instruments. Use Value: 3-state outputs allow bidirectional bus sharing; low ICC supports long-duration unattended testing. |
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 |
|---|---|---|---|
| SN74LV257APWR | Lower VCC range (1.65–5.5V); higher ICC (20µA typ.); 4.5ns tPD at 3.3V | Optimized for 1.8V/3.3V systems; less suitable for 2V operation or ultra-low-power sleep modes | Select when primary supply is 3.3V and lower static power is not critical |
| 74LVC257PW | Wider VCC range (1.65–5.5V); 3.2ns tPD at 3.3V; no 7V input tolerance | Lacks power-down input protection; requires external clamping for >VCC inputs | Choose for highest speed in 3.3V-only designs where input overvoltage is controlled |
Compared with SN74LV257APWR and 74LVC257PW, the 74VHC257TTR uniquely supports true 2V operation, offers superior input overvoltage resilience, and achieves lowest quiescent current-making it optimal for wide-supply, mixed-voltage, and battery-sensitive applications.
Availability
74VHC257TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical patient monitor data aggregation, and test equipment signal routing requiring stable component supply across extended temperature ranges and mixed-voltage interfaces.
Supply support for 74VHC257TTR 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, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The VHC logic family targets high-speed, low-power CMOS replacement for legacy 74-series devices, emphasizing robustness, wide supply range, and interoperability across voltage domains.
FAQ
Can 74VHC257TTR operate with VCC = 2.0V while accepting 5V inputs?
Yes. The device guarantees full functionality at VCC = 2.0V and accepts input voltages from 0V to 7V on all pins regardless of supply voltage-enabling direct interfacing between 2V logic and 5V peripherals without level shifters or clamping diodes.
What is the maximum output load capacitance supported at 5V supply?
At VCC = 5.0V ± 0.5V, the 74VHC257TTR drives up to 50pF load capacitance with guaranteed AC performance: tPLH/tPHL ≤7.0ns (15pF) and ≤9.0ns (50pF), and tPZL/tPLZ ≤8.0ns (15pF) and ≤10.0ns (50pF), per Table 7.
How does the 3-state output behavior respond to OE and SELECT transitions?
When OE is HIGH, all Y outputs enter high-impedance state regardless of SELECT or data inputs. When OE transitions LOW, outputs become active after tPZL (≤8.0ns at 5V/15pF); SELECT then determines whether A or B data appears at Y, with propagation delay tPLH/tPHL (≤7.0ns).
Is the 74VHC257TTR pin-compatible with older 74HC257 variants?
Yes. It is pin- and function-compatible with standard 74-series 257 multiplexers-including 74HC257 and 74LS257-in TSSOP-16 and SO-16 packages, supporting drop-in replacement while delivering improved speed, lower power, and enhanced input protection.
74VHC257TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74VHC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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-TSSOP
74VHC257TTR FAQ
1.How can I place an order for 74VHC257TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHC257TTR 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 74VHC257TTR reliable?
The price and inventory of 74VHC257TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC257TTR is usually 5 days.
3.What payment methods are accepted for 74VHC257TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC257TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHC257TTR?
74VHC257TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHC257TTR 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 74VHC257TTR?
For technical support, including 74VHC257TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC257TTR requirements.
6.How does Aetrix verify that 74VHC257TTR is sourced from the original manufacturer or authorized distributors?
All 74VHC257TTR 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 74VHC257TTR meets industry standards.
7.What is the process for return or replacement of 74VHC257TTR?
All 74VHC257TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC257TTR, 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 74VHC257TTR part is unused and in its original packaging.
Return procedure for 74VHC257TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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