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Texas Instruments SN74HC251PWRG4
- Part No.:
- SN74HC251PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC251PWRG4.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,396
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Product details
Overview
SN74HC251PWRG4 from Texas Instruments is an 8-to-1 data selector/multiplexer with complementary 3-state outputs, designed for bus-oriented digital systems. It operates across 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 9 ns (VCC = 4.5 V, CL = 50 pF), and supports parallel-to-serial conversion in logic-level translation and data routing applications.
For engineers reviewing the SN74HC251PWRG4 datasheet, SN74HC251PWRG4 pinout, SN74HC251PWRG4 application, or SN74HC251PWRG4 equivalent, this page provides verified functional modes, switching characteristics, package-specific thermal metrics, and validated alternative options for industrial control, test equipment, and embedded I/O expansion designs.
Technical Context
The SN74HC251PWRG4 implements full binary decoding of three select inputs (A, B, C) to route one of eight data inputs (D0–D7) to complementary outputs Y and W. Its strobe-controlled 3-state outputs enable direct bus interfacing with high-impedance disable via OE, eliminating contention during multi-device sharing.
It features CMOS technology with low input current (≤1 μA), high noise immunity (VIH ≥ 3.15 V at VCC = 4.5 V), and robust output drive capable of sinking/sourcing up to 6 mA while maintaining VOH ≥ 3.7 V and VOL ≤ 0.33 V under load - all within −40°C to +85°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables interoperability with 3.3 V and 5 V logic families without level shifters. |
| Propagation Delay (tpd) | Typ. 9 ns at VCC = 4.5 V, CL = 50 pF - supports high-speed data selection in real-time control paths. |
| Output Drive Strength | ±6 mA at VCC = 5 V - directly drives 15 LSTTL loads or interfaces with standard CMOS/TTL buses. |
| Input Current (II) | Max 1 μA - minimizes loading on upstream logic and preserves signal integrity in fan-out-critical nodes. |
| Power Consumption (ICC) | Max 80 μA - enables low-static-power operation in battery-backed or energy-sensitive subsystems. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded applications including PLC I/O modules. |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm body size, 1.2 mm max height), RoHS-compliant, lead finish NIPDAU/SN, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable (active-low) | Strobe control for simultaneous 3-state disable of both Y and W outputs; high = high-Z, low = active. |
| 2–4 (A, B, C) | Select Inputs | Binary address lines determining which of D0–D7 is routed to outputs; A = LSB, C = MSB. |
| 5–12 (D0–D7) | Data Inputs | Eight independent logic inputs; only one selected by A/B/C appears at Y/W in true/inverted form. |
| 13 (W) | Inverted Output | Complementary output to Y; matches inverted logic state of selected Dn input. |
| 14 (Y) | True Output | Main 3-state output carrying non-inverted logic state of selected Dn input. |
| 15 (GND) | Ground Reference | Primary return path for all internal logic and output drivers; must be low-impedance for stable switching. |
| 16 (VCC) | Supply Voltage | CMOS core and I/O supply rail; requires local 0.1-μF bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary 3-state outputs | Simultaneous true (Y) and inverted (W) outputs enable single-chip generation of differential-like signaling or dual-path logic control. |
| Wide VCC range (2–6 V) | Eliminates need for external voltage translators when interfacing between mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V peripheral bus). |
| Low ICC (≤80 μA) | Reduces quiescent power in always-on monitoring circuits, such as sensor multiplexing front-ends in industrial gateways. |
| High noise immunity | VIH ≥ 3.15 V and VIL ≤ 1.35 V at VCC = 4.5 V ensure reliable operation in electrically noisy factory-floor environments. |
| Parallel-to-serial conversion | Enables compact implementation of serial data streams from parallel sensor arrays using minimal external logic. |
Applications
| Industrial PLC I/O Expansion | Automated Test Equipment (ATE) Signal Routing |
|---|---|
|
Use Scenario: Multiplexing analog sensor inputs (via ADC interface) or discrete status signals from multiple field devices into a central controller. IC Role / Device Role / Timing Role: Data selector enabling time-division sampling of 8 channels using shared ADC and microcontroller resources. Use Value: Reduces component count and PCB area versus discrete gating; maintains deterministic timing with sub-10 ns propagation delay. |
Use Scenario: Dynamically configuring stimulus/response paths between test instruments and device-under-test (DUT) pins. IC Role / Device Role / Timing Role: High-speed signal switch routing digital patterns from pattern generator to DUT or feedback from DUT to analyzer. Use Value: Enables flexible test sequencing without mechanical relays; 3-state outputs prevent bus contention during reconfiguration. |
| Embedded Microcontroller Peripheral Sharing | Digital Logic Level Translation Hub |
|
Use Scenario: Allowing multiple MCUs or peripherals to share a common UART, SPI, or GPIO bus without hardware arbitration. IC Role / Device Role / Timing Role: Bus multiplexer isolating active driver while placing others in high-impedance state to avoid signal collisions. Use Value: Eliminates need for external tri-state buffers; OE pin allows synchronized bus access control via software. |
Use Scenario: Interfacing 3.3 V FPGA I/O banks with legacy 5 V logic subsystems requiring bidirectional level adaptation. IC Role / Device Role / Timing Role: Voltage-tolerant multiplexer acting as direction-aware level shifter for data/control lines. Use Value: Supports mixed-voltage operation without dedicated level translators; 2–6 V VCC range accommodates both domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-to-1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC151PWR | No complementary outputs; single Y output only; identical pinout and electrical specs otherwise. | Lacks inverted output path - unsuitable where true/inverted pair required for differential signaling or logic inversion. | Choose when only one output polarity is needed and board space or cost optimization is critical. |
| 74LVC151PW,118 | Lower VCC range (1.65–3.6 V); higher speed (tpd ≈ 5.4 ns); 3.6 V max VCC limits 5 V system compatibility. | Better suited for modern low-voltage SoC interfaces but cannot replace SN74HC251PWRG4 in 5 V legacy systems. | Select for 3.3 V-only designs prioritizing speed and lower power; verify VCC compatibility before substitution. |
Compared with SN74HC151PWR and 74LVC151PW,118, the SN74HC251PWRG4 uniquely provides complementary 3-state outputs across 2–6 V operation - making it the only option among the three that supports both 5 V bus interfacing and true/inverted signal generation in a single TSSOP-16 package.
Availability
SN74HC251PWRG4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automated test equipment signal routing, and embedded microcontroller peripheral sharing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74HC251PWRG4 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74HC251PWRG4 belongs to TI's 74HC logic family, engineered for high noise immunity, wide supply tolerance, and reliable 3-state bus interfacing in industrial control and instrumentation applications.
FAQ
What is the function of the OE pin on the SN74HC251PWRG4?
The OE (Output Enable) pin on the SN74HC251PWRG4 is an active-low control input that simultaneously places both Y and W outputs into high-impedance (3-state) mode when driven high. When OE is low, the selected data input appears at Y (true) and W (inverted) with full drive capability. This enables bus-sharing functionality without external gating logic, and is essential for conflict-free multi-device data routing in the SN74HC251PWRG4.
Does the SN74HC251PWRG4 support 5 V operation?
Yes, the SN74HC251PWRG4 fully supports 5 V operation within its specified recommended operating conditions: VCC = 2 V to 6 V, with guaranteed performance including ±6 mA output drive, VIH ≥ 4.2 V, and VOL ≤ 0.33 V at VCC = 5 V. It is widely deployed in 5 V TTL/CMOS systems, and its 3-state outputs interface directly with standard 5 V buses - a key design feature confirmed in the SN74HC251PWRG4 datasheet.
How does the SN74HC251PWRG4 differ from the SN74HC151?
The SN74HC251PWRG4 is the 3-state version of the 'HC151 with added complementary outputs: it provides both true (Y) and inverted (W) versions of the selected data input, whereas the SN74HC151 offers only Y. Both share identical select logic and pinout, but the SN74HC251PWRG4 adds OE control and dual-output capability - making it suitable for applications requiring signal inversion or differential-like routing without external inverters.
What is the maximum capacitive load the SN74HC251PWRG4 can drive reliably?
The SN74HC251PWRG4 is characterized for CL = 50 pF and CL = 150 pF in its switching specifications, with tpd increasing from 41 ns to 60 ns (typical) at VCC = 4.5 V. While not explicitly rated beyond 150 pF, its ±6 mA drive strength supports heavier loads than standard HC logic; however, for reliable timing in high-CL applications, the SN74HC251PWRG4 should be used with proper PCB layout, decoupling, and verified against actual system rise/fall time requirements.
Is the SN74HC251PWRG4 pin-compatible with other TSSOP-16 multiplexers?
The SN74HC251PWRG4 uses the standard TSSOP-16 footprint (PW package) defined by JEDEC MO-153, matching pin assignments for A, B, C, D0–D7, Y, W, OE, VCC, and GND across TI's 74HC251 variants. It is mechanically and electrically pin-compatible with SN74HC251PWR and SN74HC251PWR1G4, but not with non-'251 logic families (e.g., '138 or '157) due to differing functional pin mappings - always verify pin functions against the SN74HC251PWRG4 datasheet before layout reuse.
SN74HC251PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Multiplexer
- Circuit:
- 1 x 8:1
- 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-TSSOP
SN74HC251PWRG4 FAQ
1.How can I place an order for SN74HC251PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC251PWRG4 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 SN74HC251PWRG4 reliable?
The price and inventory of SN74HC251PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC251PWRG4 is usually 5 days.
3.What payment methods are accepted for SN74HC251PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC251PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC251PWRG4?
SN74HC251PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC251PWRG4 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 SN74HC251PWRG4?
For technical support, including SN74HC251PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC251PWRG4 requirements.
6.How does Aetrix verify that SN74HC251PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC251PWRG4 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 SN74HC251PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74HC251PWRG4?
All SN74HC251PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC251PWRG4, 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 SN74HC251PWRG4 part is unused and in its original packaging.
Return procedure for SN74HC251PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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