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Texas Instruments CD74AC157M
- Part No.:
- CD74AC157M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74AC157M.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,664
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Product details
Overview
CD74AC157M from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in SOIC-16 package, operating from 1.5V to 5.5V, with ±24mA output drive, balanced propagation delay, and active-low strobe (G) enabling synchronous channel disable. It routes four independent 2:1 data paths in industrial control bus switching applications.
For engineers reviewing the CD74AC157M datasheet, CD74AC157M pinout, CD74AC157M application, or CD74AC157M equivalent, this page delivers verified functional modes, real-world timing behavior at 3.3V/5V, thermal metrics for SOIC-16, and validated alternatives for multiplexer-based data routing designs.
Technical Context
The CD74AC157M implements four independent 2:1 multiplexers sharing one address select (A/B) and one active-low strobe (G). When G is high, all Y outputs are forced low regardless of A/B or data inputs; when G is low, each Yx follows the selected input (Ax or Bx) per the A/B state. All outputs are true (non-inverted) CMOS push-pull with matched sourcing/sinking capability.
It operates asynchronously with no internal clock - data routing is combinatorial and deterministic. Input transition rate must be ≤20 ns/V at VCC ≥3.6V to prevent oscillation; unused CMOS inputs require termination to VCC or GND, not floating. The SOIC-16 package has RθJA = 73°C/W and supports operation from –55°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.5V to 5.5V - enables direct interface with 1.8V, 3.3V, and 5V logic families without level shifters |
| Output Drive | ±24mA at VCC = 4.5–5.5V - drives 15 F-series TTL loads or terminates 50Ω transmission lines |
| tPLH/tPHL (5V) | 2.1–8.5ns (–55°C to 125°C) - ensures sub-10ns channel selection latency in real-time control loops |
| VIH/VIL (5.5V) | 3.85V / 1.65V - provides 30% noise margin relative to VCC, enhancing robustness in noisy industrial environments |
| ICC (5.5V) | 8–160µA - ultra-low static power enables use in battery-backed or energy-constrained systems |
| Input Capacitance | 10pF - minimizes loading on upstream drivers and preserves signal integrity in high-speed buses |
| ESD Rating | ±2000V HBM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
CD74AC157M uses a 16-pin SOIC (D) package with 9.9mm × 6mm body size, gull-wing leads, and standard JEDEC MS-012 footprint. Thermal performance: RθJA = 73°C/W, RθJC = not specified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A/B) | Address select input | Single control line selecting source A (low) or B (high) for all four channels simultaneously |
| 2–3, 5–6, 10–11, 13–14 (1A/1B, 2A/2B, 3A/3B, 4A/4B) | Data inputs | Eight total inputs grouped as four independent 2-input pairs; no internal crosstalk between channels |
| 4, 7, 9, 12 (1Y, 2Y, 3Y, 4Y) | True data outputs | Four buffered, non-inverted outputs - each reflects selected input with <10ns propagation delay at 5V |
| 8 (GND) | Ground reference | Primary return path for all I/O and supply currents; requires low-impedance PCB connection |
| 15 (G) | Active-low strobe | Global enable/disable - forces all Y outputs low when high; overrides A/B and data inputs |
| 16 (VCC) | Positive supply | Single power rail supporting 1.5–5.5V operation; requires 0.1µF local bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Balanced propagation delay | Matched tPLH/tPHL across all channels ensures deterministic timing skew <1ns in synchronized data routing |
| 1.5V–5.5V wide VCC range | Eliminates need for external voltage translators when interfacing mixed-voltage subsystems (e.g., 1.8V FPGA to 5V sensor bus) |
| ±24mA output drive | Supports fanout to 15 F-series TTL devices or direct driving of 50Ω transmission lines without external buffers |
| Active-low strobe (G) | Enables hardware-level channel muting during system reset or fault conditions without software intervention |
| CMOS push-pull outputs | Provides rail-to-rail swing and symmetrical rise/fall times, critical for clean signal edges in high-speed digital interfaces |
Applications
| Industrial PLC I/O Multiplexing | Test Equipment Signal Routing |
|---|---|
|
Use Scenario: Selecting between two analog-to-digital converter outputs feeding a single microcontroller input in a modular I/O rack. IC Role / Device Role: Quadruple 2:1 data selector enabling dynamic reconfiguration of sensor input paths without hardware changes. Use Value: Reduces board count by consolidating four independent channel switches into one SOIC-16 IC, cutting BOM cost and layout area by >60% vs discrete solutions. |
Use Scenario: Routing DUT signals between multiple measurement instruments (oscilloscope, logic analyzer, DMM) in automated test fixtures. IC Role / Device Role: High-speed, low-skew multiplexer providing glitch-free signal handoff during instrument switching sequences. Use Value: Sub-10ns propagation delay and matched channel timing ensure measurement synchronization across all four signal paths. |
| Embedded System Bus Arbitration | Digital Audio Data Switching |
|
Use Scenario: Arbitrating access to a shared SPI bus between two microcontrollers in a dual-CPU safety architecture. IC Role / Device Role: Data selector controlled by system arbiter to grant exclusive bus access while blocking conflicting transmissions. Use Value: Active-low strobe (G) allows immediate bus isolation during fault detection, meeting SIL-2 response time requirements. |
Use Scenario: Switching between two I²S audio sources (Bluetooth receiver and SD card player) feeding a single DAC in portable audio gear. IC Role / Device Role: Quad 2:1 mux routing left/right channel data and word clock synchronously under microcontroller control. Use Value: True outputs and 10pF input capacitance preserve signal integrity up to 24.576MHz I²S rates without added jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC157N | Same AC logic family, identical pinout and electrical specs, but PDIP-16 package (larger footprint, higher RθJA = 67°C/W) | Preferred for through-hole prototyping or legacy board reuse where SOIC rework is impractical | Select when mechanical compatibility with existing DIP sockets or manual assembly is required |
| CD74HC157M | HC family: lower drive (±7.8mA), slower speed (tPLH up to 29ns at 5V), wider VCC range (2–6V), higher ICC (80µA typical) | Suitable for cost-sensitive, low-speed applications where fanout <10 and latency <30ns is acceptable | Select when power budget allows higher static current and timing margins permit HC-grade propagation delay |
Compared with SN74AC157N, CD74AC157M offers superior thermal performance in surface-mount production; compared with CD74HC157M, it delivers 3× faster switching and 3× stronger drive at identical supply voltages - critical for high-fidelity data routing.
Availability
CD74AC157M is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automated test equipment, embedded bus arbitration systems, and digital audio switching applications requiring stable component supply across extended temperature ranges.
Supply support for CD74AC157M 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power, and signal chain technologies.
The CD74AC157M belongs to TI's advanced CMOS (AC) logic family, engineered for high-speed, low-power data routing in industrial, automotive, and communications systems where timing precision and supply voltage flexibility are critical.
FAQ
What is the maximum operating temperature range for CD74AC157M?
The CD74AC157M is rated for operation from –55°C to 125°C, as confirmed in the Recommended Operating Conditions table. This extended range supports deployment in harsh industrial environments such as motor control cabinets, outdoor telecom infrastructure, and automotive under-hood applications where ambient temperatures exceed standard commercial limits.
Does CD74AC157M support 1.8V logic levels?
Yes, CD74AC157M fully supports 1.8V operation: its VCC range is 1.5V to 5.5V, and VIH/VIL thresholds scale proportionally (e.g., VIH = 1.2V at VCC = 1.5V). At 1.8V supply, it maintains guaranteed switching performance with tPLH/tPHL ≤15ns and ±12mA output drive - sufficient for interfacing with 1.8V FPGAs and microcontrollers.
Can CD74AC157M outputs be paralleled for higher drive strength?
Yes - the CD74AC157M's matched CMOS push-pull outputs allow safe parallel connection of like-named outputs (e.g., 1Y and 2Y) to double sink/source current capacity. This is explicitly permitted in the Feature Description section and maintains timing integrity because propagation delays are balanced across channels.
What is the recommended bypass capacitor for CD74AC157M?
A 0.1µF ceramic capacitor placed as close as possible between VCC (pin 16) and GND (pin 8) is mandatory per TI's Layout Guidelines. For improved high-frequency noise rejection, add a parallel 1µF capacitor. Both must use short, wide traces to minimize inductance - failure to implement proper decoupling risks increased ground bounce and timing violations.
Is CD74AC157M pin-compatible with CD74HC157M?
Yes, CD74AC157M and CD74HC157M share identical SOIC-16 pinout, function table, and terminal assignments. However, they are not functionally interchangeable without design review: AC offers 3× faster speed and 3× stronger drive, while HC consumes less dynamic power at low frequencies. Swapping requires verification of timing margins and load drive capability.
CD74AC157M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
CD74AC157M FAQ
1.How can I place an order for CD74AC157M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC157M 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 CD74AC157M reliable?
The price and inventory of CD74AC157M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC157M is usually 5 days.
3.What payment methods are accepted for CD74AC157M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC157M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC157M?
CD74AC157M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC157M 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 CD74AC157M?
For technical support, including CD74AC157M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC157M requirements.
6.How does Aetrix verify that CD74AC157M is sourced from the original manufacturer or authorized distributors?
All CD74AC157M 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 CD74AC157M meets industry standards.
7.What is the process for return or replacement of CD74AC157M?
All CD74AC157M units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC157M, 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 CD74AC157M part is unused and in its original packaging.
Return procedure for CD74AC157M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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