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Texas Instruments CD74AC157E
- Part No.:
- CD74AC157E
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74AC157E.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:754
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Product details
Overview
CD74AC157E from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in 16-pin PDIP package, operating from 1.5V to 5.5V, delivering ±24mA output drive, balanced propagation delay, and true data routing for 4-bit parallel bus selection in digital logic systems.
For engineers reviewing the CD74AC157E datasheet, CD74AC157E pinout, CD74AC157E application, or CD74AC157E equivalent, this page provides verified functional modes, switching characteristics at 3.3V/5V, thermal metrics for PDIP, absolute maximum ratings, and real-world multiplexer implementation guidance.
Technical Context
The CD74AC157E implements four independent 2:1 multiplexers sharing a common active-low strobe (G) and address select (A/B) input. Each Y output reflects the selected A or B input when G is low; all outputs force low when G is high.
It uses high-speed silicon-gate CMOS technology with balanced push-pull outputs, standard CMOS inputs requiring fast transitions (≤20 ns/V at 5V), and internal clamp diodes for ESD protection per HBM ±2000V and CDM ±1000V standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 5.5V - supports mixed-voltage system interfacing and battery-powered logic |
| Output Drive Current | ±24mA at VCC = 4.5–5.5V - drives up to 15 F-series TTL loads directly |
| Propagation Delay (tPLH/tPHL) | 2.2–7.7ns at VCC = 5V, CL = 50pF - enables high-speed data routing in 20+ MHz digital control paths |
| Input Voltage Thresholds | VIL = 0.3V / VIH = 3.85V at VCC = 5.5V - ensures noise margin ≥30% of supply for robust logic-level discrimination |
| Power Dissipation Capacitance | 156pF - used to calculate dynamic power consumption in clocked applications |
| Operating Temperature | –55°C to +125°C - qualified for industrial and extended-temperature embedded control environments |
| ESD Rating (HBM) | ±2000V - meets JEDEC JS-001 for safe handling in standard manufacturing environments |
Pinout & Package
CD74AC157E is supplied in a 16-pin plastic dual in-line package (PDIP, N package), body size 19.3mm × 6.35mm, with through-hole mounting and industry-standard lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A/B | Global address select: determines whether A-inputs (A/B = L) or B-inputs (A/B = H) route to outputs |
| 2–3, 5–6, 10–11, 13–14 | 1A/1B, 2A/2B, 3A/3B, 4A/4B | Eight data inputs - two per channel, supporting independent 4-bit source selection |
| 4, 7, 9, 12 | 1Y, 2Y, 3Y, 4Y | Four true-data outputs - each mirrors selected A/B input when strobe is active low |
| 8 | GND | Ground reference - must be low-impedance connection to minimize switching noise coupling |
| 15 | G | Active-low strobe - forces all Y outputs low regardless of A/B or data inputs when high |
| 16 | VCC | Positive supply - requires local 0.1µF bypass capacitor to suppress supply transients |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 1.5V–5.5V operation enables interoperability across legacy 5V, modern 3.3V, and low-power 1.8V logic families |
| Balanced Propagation Delay | Matched tPLH/tPHL minimizes skew between channels - critical for synchronous 4-bit bus routing |
| High Output Drive | ±24mA sink/source capability eliminates need for external buffers when driving multiple TTL or CMOS loads |
| Strobe-Controlled Output Disable | Active-low G input allows synchronized channel blanking without address reconfiguration |
| CMOS Input Compatibility | Standard CMOS inputs with ≤1µA leakage ensure minimal loading on upstream drivers and compatibility with microcontroller GPIO |
Applications
| Industrial PLC I/O Multiplexing | Digital Test Equipment Signal Routing |
|---|---|
Use Scenario: Selecting between two sensor banks (e.g., temperature and pressure) feeding a single ADC input in an industrial controller. IC Role / Device Role / Timing Role: Quadruple 2:1 multiplexer enabling time-shared sampling of 4-channel analog front-ends via shared conversion path. Use Value: Reduces component count vs. discrete switches; maintains signal integrity with <8ns propagation delay and rail-to-rail CMOS output swing. |
Use Scenario: Switching stimulus signals between DUT ports in automated test equipment with fixed timing constraints. IC Role / Device Role / Timing Role: Synchronized data path selector controlled by pattern generator, routing 4-bit control words to multiple device-under-test interfaces. Use Value: Enables deterministic sub-10ns channel switching with strobe-based blanking to prevent glitch propagation during reconfiguration. |
| Microcontroller Peripheral Expansion | Legacy Bus Interface Translation |
Use Scenario: Expanding GPIO count by multiplexing two sets of peripheral control lines (e.g., display and keypad drivers) onto limited MCU pins. IC Role / Device Role / Timing Role: Logic-level data selector allowing software-controlled routing of 4-bit command buses without hardware redesign. Use Value: Provides pin-efficient expansion with no added latency beyond propagation delay; compatible with 3.3V/5V MCU I/O voltage levels. |
Use Scenario: Adapting a 4-bit legacy parallel interface (e.g., printer port) to modern microcontroller with mismatched voltage or timing requirements. IC Role / Device Role / Timing Role: Level-shifting multiplexer bridging 5V peripherals and 3.3V controllers using supply-voltage tolerant operation. Use Value: Eliminates need for discrete level shifters; supports bidirectional data flow direction control via A/B and G inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC157N | Same logic function, identical pinout, but rated only for –40°C to +85°C industrial range (vs. CD74AC157E's –55°C to +125°C) | Suitable for commercial/industrial ambient environments; not qualified for extended-temperature operation | Select SN74AC157N where full military-grade temperature range is unnecessary and cost optimization is prioritized |
| CD74HC157E | Pin-compatible HC variant with lower drive (±7.8mA) and slower max speed (18.5ns @ 3.3V); operates 2V–6V | Better suited for ultra-low-power or higher-voltage (6V) systems where speed <10MHz suffices | Choose CD74HC157E when reduced power consumption outweighs speed requirements and 5.5V max supply is acceptable |
Compared with SN74AC157N and CD74HC157E, the CD74AC157E delivers superior temperature resilience and higher output drive while maintaining identical PDIP footprint-making it optimal for ruggedized control systems demanding both performance and environmental robustness.
Availability
CD74AC157E is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and embedded control applications requiring stable component supply, long-term lifecycle support, and extended-temperature qualification.
Supply support for CD74AC157E 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 heritage in high-reliability logic IC design and manufacturing.
The CD74AC157E belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-power data routing in industrial, aerospace, and automotive control systems where timing precision and environmental resilience are critical.
FAQ
What is the maximum operating frequency supported by CD74AC157E?
The CD74AC157E does not specify a maximum clock frequency, as it is an asynchronous combinatorial device. Its usable data rate depends on propagation delay and load capacitance. At VCC = 5V and CL = 50pF, tPLH/tPHL is 2.2–7.7ns, enabling reliable operation in digital systems with signal periods >15ns (i.e., >66MHz toggle rate on individual channels).
Can CD74AC157E operate at 1.8V supply voltage?
Yes, CD74AC157E is fully specified for operation from 1.5V to 5.5V, including 1.8V. At 1.8V, VIH is 1.35V and VIL is 0.45V, providing adequate noise margin. Switching characteristics are characterized down to 1.5V, with tPLH/tPHL ≤97ns at –55°C to +125°C ambient.
How does the strobe (G) input affect output behavior in CD74AC157E?
In CD74AC157E, the G input is an active-low enable. When G = HIGH, all four Y outputs are forced LOW regardless of A/B state or data inputs. When G = LOW, the multiplexer functions normally: each Y output equals the selected A or B input per the A/B address signal. This allows synchronized channel disabling without altering address control.
Is CD74AC157E pin-compatible with older 74LS157 or 74F157 devices?
No, CD74AC157E is not pin-compatible with bipolar 74LS157 or 74F157. While all are quadruple 2:1 multiplexers in 16-pin packages, the pin assignments differ: CD74AC157E places G on pin 15 and VCC on pin 16, whereas 74LS157 locates G on pin 1 and VCC on pin 16. Direct replacement requires PCB redesign.
What decoupling capacitor value is recommended for CD74AC157E?
A 0.1µF ceramic capacitor is recommended for CD74AC157E, placed as close as possible between pin 16 (VCC) and pin 8 (GND). For improved high-frequency noise suppression, TI recommends paralleling with a 1µF capacitor. Trace lengths to the capacitor must be minimized to maintain low impedance at switching frequencies.
CD74AC157E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74AC157E FAQ
1.How can I place an order for CD74AC157E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC157E 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 CD74AC157E reliable?
The price and inventory of CD74AC157E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC157E is usually 5 days.
3.What payment methods are accepted for CD74AC157E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC157E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC157E?
CD74AC157E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC157E 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 CD74AC157E?
For technical support, including CD74AC157E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC157E requirements.
6.How does Aetrix verify that CD74AC157E is sourced from the original manufacturer or authorized distributors?
All CD74AC157E 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 CD74AC157E meets industry standards.
7.What is the process for return or replacement of CD74AC157E?
All CD74AC157E units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC157E, 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 CD74AC157E part is unused and in its original packaging.
Return procedure for CD74AC157E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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