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Texas Instruments CD74AC257M96
- Part No.:
- CD74AC257M96
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74AC257M96.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,647
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Product details
Overview
CD74AC257M96 from Texas Instruments is a quad 2-input non-inverting multiplexer with three-state outputs, designed for data routing in digital logic systems. It operates across 1.5V–5.5V supply, delivers ±24mA output drive, exhibits 8.5ns typical propagation delay at 5V/25°C, and supports industrial temperature range (−55°C to +125°C) - used in bus arbitration and register-to-bus data transfer.
For engineers reviewing the CD74AC257M96 datasheet, CD74AC257M96 pinout, CD74AC257M96 application, or CD74AC257M96 equivalent, key selection criteria include its 16-pin SOIC package, three-state enable control (active-low OE), balanced propagation delays, ESD robustness (>2kV), and compatibility with FAST™-level fanout (15 loads).
Technical Context
The CD74AC257M96 implements four independent 2:1 multiplexers sharing one common select (S) and one active-low output enable (OE). Each channel routes either I₀ or I₁ to Y based on S, with all outputs entering high-impedance state when OE is high.
Its Advanced CMOS process ensures SCR-latchup resistance, 10pF input capacitance, 15pF three-state output capacitance, and operation down to 1.5V - enabling mixed-voltage interface bridging while maintaining TTL-compatible noise margins at 30% of VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 5.5V - supports low-voltage logic domains and backward compatibility with 5V systems |
| Propagation Delay (tPLH/tPHL) | 8.5ns typical at VCC = 5V, TA = 25°C, CL = 50pF - enables high-speed data switching in timing-critical paths |
| Output Drive Current | ±24mA per output - drives 15 FAST™ ICs or 50Ω transmission lines directly without buffers |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial and automotive under-hood applications |
| ESD Protection | >2kV HBM per MIL-STD-883 Method 3015 - enhances reliability in handling and board assembly |
| Input/Output Capacitance | CI = 10pF, CO = 15pF - minimizes loading on driving sources and reduces signal integrity degradation |
Pinout & Package
CD74AC257M96 is packaged in a 16-pin SOIC (D package), body size 9.9mm × 3.9mm, with standard 1.27mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S (Select) | Common control input determining which of two data inputs (I₀ or I₁) is routed to each Y output |
| 2–3, 5–6, 10–11, 13–14 | I₀/I₁ (Data Inputs) | Four pairs of independent 2-input channels (1A/1B through 4A/4B); no internal cross-talk |
| 4, 7, 9, 12 | Y (Outputs) | Non-inverting buffered outputs; high-impedance when OE = HIGH |
| 8 | GND | Ground reference for logic and power return path |
| 15 | OE (Output Enable) | Active-low global enable controlling all four outputs simultaneously |
| 16 | VCC | Positive supply rail; bypass capacitor (0.1μF) required adjacent to pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting multiplexing | Preserves logic polarity across all four channels - eliminates need for external inverters in signal path |
| Three-state outputs with common OE | Enables time-multiplexed bus sharing among multiple devices without contention or external bus transceivers |
| Balanced propagation delays | Ensures consistent timing skew between channels - critical for parallel data routing and synchronous sampling |
| 1.5V–5.5V wide supply range | Permits direct interfacing between 1.8V, 2.5V, 3.3V, and 5V logic domains without level shifters |
| SCR-latchup-resistant CMOS | Guarantees immunity to latch-up under overvoltage or ESD stress - improves system-level robustness |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Multiplexing |
|---|---|
Use Scenario: Routing sensor data from multiple analog input modules to a shared ADC channel in programmable logic controllers. IC Role / Device Role / Timing Role: Quad 2:1 data selector synchronizing four analog front-end channels onto one serial interface path. Use Value: Reduces PCB trace count and microcontroller GPIO usage while maintaining deterministic latency (<9ns) across all channels. | Use Scenario: Switching between multiple DUT (device-under-test) signal lines during automated functional testing. IC Role / Device Role / Timing Role: High-speed signal path selector enabling test pattern generator to drive different pins without reconfiguration delay. Use Value: ±24mA drive capability allows direct connection to 50Ω coaxial test fixtures; 1.5V–5.5V operation supports mixed-voltage DUTs. |
| Automotive Body Control Module | Legacy System Bus Interface |
Use Scenario: Consolidating door lock, window lift, and mirror control signals onto a shared CAN/LIN transceiver data line. IC Role / Device Role / Timing Role: Logic-level multiplexer managing discrete actuator command routing under MCU supervision. Use Value: −55°C to +125°C rating ensures reliable operation in engine bay and cabin environments; ESD hardening protects against field-induced transients. | Use Scenario: Bridging legacy 5V TTL peripherals (e.g., EPROMs, UARTs) to modern 3.3V microcontrollers in retrofitted embedded systems. IC Role / Device Role / Timing Role: Voltage-tolerant data switch enabling bidirectional signal translation without dedicated level shifters. Use Value: 3.3V operation with 5V-tolerant inputs eliminates external clamping diodes; balanced delays preserve setup/hold timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74ACT257M96 | TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V); 5V-only supply (4.5V–5.5V) | Optimized for strict 5V systems with legacy TTL drivers; higher speed at 5V (7.3ns typ) | Select when interfacing exclusively with 5V TTL sources and maximum speed at 5V is required |
| SN74LV4052ADR | Dual 4:1 analog/digital multiplexer; LV logic family (1.65V–5.5V); no three-state outputs | Supports bidirectional analog signal routing; lacks OE-controlled high-Z state for bus sharing | Select when analog signal switching or dual independent 4:1 paths are needed instead of quad 2:1 with bus isolation |
Compared with CD74ACT257M96, CD74AC257M96 offers wider voltage flexibility and better noise immunity at lower voltages; compared with SN74LV4052ADR, it provides dedicated three-state bus control and simpler 2:1 per-channel architecture ideal for digital-only data routing.
Availability
CD74AC257M96 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and test equipment requiring stable component supply and long-term obsolescence management.
Supply support for CD74AC257M96 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 and embedded processing solutions, with decades of experience in high-reliability logic and interface ICs.
CD74AC257M96 belongs to TI's CD74AC advanced CMOS logic family, engineered for low-power, high-speed digital signal routing in harsh environments and mixed-voltage systems.
FAQ
What is the recommended bypass capacitor for CD74AC257M96?
A 0.1μF ceramic capacitor is recommended directly between VCC (pin 16) and GND (pin 8) to suppress high-frequency noise. For enhanced broadband filtering, TI recommends paralleling this with a 1μF capacitor - both placed as close as possible to the device pins to minimize inductance and ensure stable operation across the full −55°C to +125°C range. This applies specifically to CD74AC257M96 in its SOIC package.
Does CD74AC257M96 support 3.3V-only operation?
Yes, CD74AC257M96 fully supports 3.3V operation within its specified 1.5V–5.5V supply range. At VCC = 3.3V, it guarantees VIH ≥ 2.1V and VIL ≤ 0.9V with balanced noise margins, and delivers 13ns typical propagation delay. Its AC-series design ensures compatibility with both 3.3V LVTTL and mixed-voltage interfaces - a core specification confirmed for CD74AC257M96 in the official datasheet.
Is CD74AC257M96 pin-compatible with CD74ACT257M96?
Yes, CD74AC257M96 and CD74ACT257M96 share identical 16-pin SOIC (D) packaging, pinout, and function mapping - including S, OE, I₀/I₁, and Y assignments. However, they differ in input threshold specifications and supply voltage ranges; CD74AC257M96 operates from 1.5V–5.5V with AC thresholds, while CD74ACT257M96 requires 4.5V–5.5V and uses ACT (TTL-compatible) thresholds. Both are drop-in replacements electrically only if voltage and driver compatibility are verified.
What is the thermal performance of CD74AC257M96 in SOIC package?
CD74AC257M96 in SOIC (D) package has a junction-to-ambient thermal resistance (RθJA) of 119.9°C/W under standard JEDEC test conditions. This value assumes mounting on an evaluation PCB in free air; actual performance improves with copper pour and thermal vias. The device's quiescent current remains below 160μA across temperature, limiting self-heating - a confirmed thermal characteristic for CD74AC257M96 per TI's SCHS248C datasheet.
Can unused inputs on CD74AC257M96 be left floating?
No, unused inputs on CD74AC257M96 must not be left floating. TI explicitly requires all unused inputs (including S, OE, and any unconnected I₀/I₁) to be tied to a defined logic level - either VCC or GND - per the input voltage specifications. Floating inputs can cause increased supply current, erratic output behavior, or localized heating. This requirement is documented in the "Layout Guidelines" section of the CD74AC257M96 datasheet and applies strictly to this part number.
CD74AC257M96 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:
- Active
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- 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
CD74AC257M96 FAQ
1.How can I place an order for CD74AC257M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC257M96 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 CD74AC257M96 reliable?
The price and inventory of CD74AC257M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC257M96 is usually 5 days.
3.What payment methods are accepted for CD74AC257M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC257M96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC257M96?
CD74AC257M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC257M96 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 CD74AC257M96?
For technical support, including CD74AC257M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC257M96 requirements.
6.How does Aetrix verify that CD74AC257M96 is sourced from the original manufacturer or authorized distributors?
All CD74AC257M96 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 CD74AC257M96 meets industry standards.
7.What is the process for return or replacement of CD74AC257M96?
All CD74AC257M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC257M96, 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 CD74AC257M96 part is unused and in its original packaging.
Return procedure for CD74AC257M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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