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Texas Instruments CD74AC251M96E4
- Part No.:
- CD74AC251M96E4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74AC251M96E4.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,275
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Product details
Overview
CD74AC251M96E4 from Texas Instruments is an 8-input CMOS multiplexer with true (Y) and complement (Y̅) outputs, three-state output enable (OE), 1.5V–5.5V supply operation, ±24mA drive capability, and 6ns typical propagation delay at 5V/25°C/50pF - used in digital signal routing, data selection, and bus isolation circuits.
For engineers reviewing the CD74AC251M96E4 datasheet, CD74AC251M96E4 pinout, CD74AC251M96E4 application, or CD74AC251M96E4 equivalent, key selection considerations include its dual-output architecture, wide VCC range, ESD-hardened design (2kV MIL-STD-883), balanced noise immunity, and SOIC-16 package compatibility with industrial temperature operation (-55°C to +125°C).
Technical Context
The CD74AC251M96E4 implements a single 8:1 multiplexer using Harris Advanced CMOS logic, supporting address decoding via three select inputs (S0–S2) to route one of eight data inputs (I0–I7) to complementary outputs Y and Y̅. Its three-state OE control enables bus sharing without external gating.
It features SCR-latchup-resistant fabrication, buffered inputs for reduced loading, and propagation delays optimized across voltage ranges: 12.3ns (typ) at 5V, 17.2ns (typ) at 3.3V, and 153ns (max) at 1.5V - all specified under CL = 50pF and input slew rates of 20–50ns depending on VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.5V to 5.5V - supports mixed-voltage system interfacing and low-power operation down to 1.5V logic levels. |
| Propagation Delay (tPLH/tPHL) | 12.3ns (typ) at 5V - enables high-speed data selection in timing-critical digital control paths. |
| Output Drive | ±24mA - directly drives 50Ω transmission lines or fans out to 15 FAST™ ICs without buffers. |
| Input/Output Voltage Levels | VIH = 3.85V min @ 5.5V VCC; VIL = 1.65V max @ 5.5V - ensures robust noise margin (30% of VCC) across full supply range. |
| ESD Protection | 2kV HBM per MIL-STD-883 Method 3015 - enhances reliability in handling-sensitive industrial and test environments. |
| Operating Temperature | -55°C to +125°C - qualified for extended-range automotive, aerospace, and harsh-environment embedded systems. |
| Three-State Leakage | ±10μA max @ -55°C to +125°C - minimizes bus contention current when outputs are disabled. |
Pinout & Package
CD74AC251M96E4 is housed in a 16-pin SOIC (D package) with 9.9mm × 6mm footprint and 9.9mm × 3.9mm body size, compatible with standard surface-mount assembly and IPC-7351B land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I3) | Data Input | Selectable input channel 3; referenced in truth table when S2S1S0 = 011. |
| 2 (I2) | Data Input | Selectable input channel 2; active when S2S1S0 = 010. |
| 3 (I1) | Data Input | Selectable input channel 1; active when S2S1S0 = 001. |
| 4 (I0) | Data Input | Selectable input channel 0; default path when all selects are low. |
| 5 (Y) | True Output | Active-high routed data output; high-impedance when OE = HIGH. |
| 6 (Y̅) | Inverted Output | Complementary to Y; both outputs enabled/disabled simultaneously by OE. |
| 7 (OE) | Output Enable | Active-low control: LOW enables Y/Y̅; HIGH forces both into high-Z state. |
| 8 (GND) | Ground Reference | Primary return path for logic and supply currents; must be low-impedance. |
| 9 (S2) | Select Input | MSB of 3-bit address bus selecting I0–I7; determines input routing priority. |
| 10 (S1) | Select Input | Mid-bit of address bus; works with S2/S0 to decode one of eight inputs. |
| 11 (S0) | Select Input | LSB of address bus; completes 3-bit binary selection of input channel. |
| 12 (I7) | Data Input | Selectable input channel 7; active when S2S1S0 = 111. |
| 13 (I6) | Data Input | Selectable input channel 6; active when S2S1S0 = 110. |
| 14 (I5) | Data Input | Selectable input channel 5; active when S2S1S0 = 101. |
| 15 (I4) | Data Input | Selectable input channel 4; active when S2S1S0 = 100. |
| 16 (VCC) | Supply Voltage | Positive power rail; bypass capacitor (0.1μF) required adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 1.5V–5.5V operation enables interoperability with 1.8V, 3.3V, and 5V logic families without level shifters. |
| Balanced Propagation Delays | Matched tPLH/tPHL ensures minimal skew between true/inverted outputs - critical for differential signaling and clock distribution. |
| SCR-Latchup Resistance | Harris CMOS process prevents destructive latch-up under transient overvoltage or ESD events in real-world PCB environments. |
| High Noise Immunity | 30% VCC noise margin at all supply voltages reduces susceptibility to crosstalk and ground bounce in dense digital layouts. |
| Transmission-Line Drive | ±24mA output supports direct 50Ω impedance matching - eliminates need for external termination resistors in high-speed buses. |
Applications
| Industrial PLC I/O Multiplexing | Digital Test Equipment Signal Routing |
|---|---|
Use Scenario: Consolidating multiple sensor inputs (temperature, pressure, flow) onto a single ADC channel in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Data selector enabling time-division sampling of up to eight analog channels via shared conversion resources. Use Value: Reduces component count and PCB area versus discrete gating; maintains sub-13ns timing resolution at 5V for deterministic scan cycles. | Use Scenario: Switching stimulus signals between DUT pins and measurement instruments in automated test fixtures. IC Role / Device Role / Timing Role: High-fidelity signal path selector with matched Y/Y̅ outputs for differential probe interfaces or reference comparison. Use Value: ±24mA drive ensures clean edge integrity into 50Ω scope inputs; 2kV ESD rating protects against operator-induced transients during probe reconfiguration. |
| Avionics Data Bus Isolation | Legacy System Interface Bridging |
Use Scenario: Isolating redundant flight control data streams during fault detection and voting logic in DO-254-compliant avionics modules. IC Role / Device Role / Timing Role: Three-state-enabled bus arbitrator routing validated sensor data to primary/backup processors based on health status. Use Value: -55°C to +125°C qualification meets RTCA DO-160 environmental requirements; high-Z state prevents bus contention during failover transitions. | Use Scenario: Adapting 8-bit parallel data from legacy microcontrollers (e.g., 8051) to modern FPGA-based controllers with mismatched voltage domains. IC Role / Device Role / Timing Role: Level-translating multiplexer allowing 5V-tolerant I/Os to interface with 3.3V or 1.8V logic without external translators. Use Value: 1.5V–5.5V VCC range accommodates both source and sink logic families; buffered inputs prevent loading of weak legacy drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC251N | Dual-in-line (PDIP-16) package; identical AC logic family, same pinout, but through-hole mounting and higher thermal resistance (RθJA = 150°C/W vs. 119.9°C/W). | Preferred for prototyping or low-volume hand-soldered boards where SOIC reflow is unavailable. | Select SN74AC251N only when manual assembly or socket-based validation is required; not suitable for high-density SMT production. |
| CD74HC251M96 | HC logic family: narrower VCC range (2V–6V), slower propagation (24ns typ @ 4.5V), lower drive (±5.2mA), no 1.5V operation or 2kV ESD rating. | Suitable for cost-sensitive consumer applications where speed and ruggedness are secondary to BOM cost. | Choose CD74HC251M96 only if system operates above 2V and does not require industrial-grade ESD or transmission-line drive capability. |
Compared with SN74AC251N and CD74HC251M96, CD74AC251M96E4 delivers superior high-speed performance, wider voltage flexibility, and enhanced ruggedness - making it the optimal choice for industrial automation, test equipment, and aerospace systems demanding reliable 8:1 signal routing under extreme conditions.
Availability
CD74AC251M96E4 is available at Aetrix Electronics and suitable for industrial PLC I/O consolidation, avionics bus arbitration, and digital test equipment signal routing requiring stable component supply across extended temperature and voltage ranges.
Supply support for CD74AC251M96E4 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 solutions, with decades of expertise in high-reliability logic families and industrial-grade timing products.
The CD74AC251M96E4 belongs to TI's Advanced CMOS (AC) logic series - engineered for high-speed, low-power digital signal routing in mission-critical systems operating across extended temperature and supply voltage ranges.
FAQ
What is the minimum supply voltage required for CD74AC251M96E4 to operate reliably?
The CD74AC251M96E4 is fully specified to operate down to 1.5V VCC across its entire temperature range (-55°C to +125°C). At this voltage, propagation delay increases to 153ns (max), and input thresholds scale proportionally (VIH = 1.2V min, VIL = 0.3V max). This enables compatibility with ultra-low-voltage microcontrollers and battery-powered instrumentation where 1.8V logic is insufficient.
Does CD74AC251M96E4 support simultaneous true and inverted output use in differential signaling?
Yes, CD74AC251M96E4 provides complementary Y and Y̅ outputs that switch in strict antiphase with matched propagation delays - confirmed by balanced tPLH/tPHL specifications and functional truth table behavior. This allows direct implementation of differential data paths without external inverters, reducing skew and component count in high-integrity communication interfaces.
How does the Output Enable (OE) pin function on CD74AC251M96E4?
The OE pin on CD74AC251M96E4 is active-low: when held LOW, Y and Y̅ reflect the selected input; when driven HIGH, both outputs enter high-impedance (three-state) mode regardless of select or input states. This enables bus-sharing configurations where multiple CD74AC251M96E4 devices share common data lines under centralized control.
Can CD74AC251M96E4 drive 50Ω transmission lines directly without external termination?
Yes, CD74AC251M96E4 is explicitly characterized for 50Ω transmission-line drive at ±24mA output current - verified per datasheet Section 4.4 (VOL/VOH tests at 24mA, 75Ω at 125°C). This allows direct connection to coaxial cables, PCB traces, or oscilloscope inputs without series or parallel termination resistors, preserving signal integrity in high-speed test and measurement setups.
Is CD74AC251M96E4 pin-compatible with older CD74ACT251 variants?
No, CD74AC251M96E4 is not pin-compatible with CD74ACT251. The ACT version uses different input thresholds, higher drive strength (±24mA vs. ±50mA), and lacks the 1.5V operation and 2kV ESD rating of the AC variant. While both share the same SOIC-16 package and pinout mapping, electrical behavior differs significantly - substitution requires validation of timing, noise margins, and supply compatibility in the target circuit.
CD74AC251M96E4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 1 x 8:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 75mA, 75mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 1.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74AC251M96E4 FAQ
1.How can I place an order for CD74AC251M96E4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC251M96E4 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 CD74AC251M96E4 reliable?
The price and inventory of CD74AC251M96E4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC251M96E4 is usually 5 days.
3.What payment methods are accepted for CD74AC251M96E4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC251M96E4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC251M96E4?
CD74AC251M96E4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC251M96E4 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 CD74AC251M96E4?
For technical support, including CD74AC251M96E4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC251M96E4 requirements.
6.How does Aetrix verify that CD74AC251M96E4 is sourced from the original manufacturer or authorized distributors?
All CD74AC251M96E4 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 CD74AC251M96E4 meets industry standards.
7.What is the process for return or replacement of CD74AC251M96E4?
All CD74AC251M96E4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC251M96E4, 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 CD74AC251M96E4 part is unused and in its original packaging.
Return procedure for CD74AC251M96E4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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