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Texas Instruments CD74HC157EG4
- Part No.:
- CD74HC157EG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HC157EG4.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,080
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Product details
Overview
CD74HC157EG4 from Texas Instruments is a high-speed CMOS quad 2-input non-inverting multiplexer with active-low enable (E), common select (S), and 16-pin PDIP package. It operates from 2V to 6V, supports -55°C to +125°C industrial/military temperature range, delivers ≤38 ns propagation delay at 6V/50pF, and forces all outputs low when enabled high - used in register-to-bus data routing and logic function generation.
For engineers reviewing the CD74HC157EG4 datasheet, CD74HC157EG4 pinout, CD74HC157EG4 application, or CD74HC157EG4 equivalent, key selection criteria include its HC-family voltage flexibility (2–6V), guaranteed rail-to-rail output drive under full temperature range, non-inverting output behavior versus CD74HC158, and compatibility with LSTTL loads via 10-unit fanout capability.
Technical Context
The CD74HC157EG4 implements four independent 2:1 multiplexers sharing one select line (S) and one active-low enable (E). Each channel routes either I0 or I1 to Y based on S state, with E overriding all inputs to force Y = LOW when HIGH. Its HC logic family ensures CMOS-level input thresholds and noise immunity (NIL/NIH = 30% of VCC at 5V).
Propagation delays are specified across voltage (2V/4.5V/6V) and load (15pF/50pF) conditions, with worst-case tPLH/tPHL = 190 ns at 2V/50pF and 21 ns at 6V/50pF. Input leakage remains ≤±1 µA over full temperature range, and quiescent ICC is ≤160 µA at 6V and -55°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-Speed CMOS (HC), not TTL-compatible - requires 2V–6V supply and CMOS-level inputs |
| Function | Quad 2-input non-inverting multiplexer: selects one of two data sources per channel using shared S and E |
| Supply Voltage Range | 2V to 6V - enables direct interface with 3.3V and 5V systems without level shifting |
| Propagation Delay (max) | 38 ns at VCC = 6V, CL = 50pF - supports >10 MHz data switching in synchronous bus applications |
| Operating Temperature | -55°C to +125°C - qualified for military, aerospace, and harsh-environment industrial control |
| Fanout Capability | 10 LSTTL loads - drives standard TTL inputs without buffer amplification |
| Input Noise Immunity | NIL = NIH = 30% of VCC at VCC = 5V - rejects common-mode noise in noisy embedded environments |
Pinout & Package
CD74HC157EG4 uses a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin 1 is located at top-left corner with notch orientation as marked on package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Active-Low Enable | When HIGH, forces all Y outputs LOW regardless of S or I0/I1 states - enables global output disable |
| 2 (1I0) | Channel 1 Data Input 0 | First data source for multiplexer channel 1; selected when S = LOW |
| 3 (1I1) | Channel 1 Data Input 1 | Second data source for channel 1; selected when S = HIGH |
| 4 (1Y) | Channel 1 Output | Non-inverting output of channel 1 - mirrors selected input (1I0 or 1I1) |
| 5 (2I0) | Channel 2 Data Input 0 | First data source for channel 2; shares same S and E control as other channels |
| 6 (2I1) | Channel 2 Data Input 1 | Second data source for channel 2; synchronized selection with all four channels |
| 7 (GND) | Ground Reference | Primary return path for all internal logic and output current - must be low-impedance |
| 8 (2Y) | Channel 2 Output | Non-inverting output of channel 2 - electrically isolated but logically coordinated with other Y pins |
| 9 (3Y) | Channel 3 Output | Non-inverting output of channel 3 - maintains consistent timing relationship with 1Y and 2Y |
| 10 (4Y) | Channel 4 Output | Non-inverting output of channel 4 - completes quad-channel data routing capability |
| 11 (4I0) | Channel 4 Data Input 0 | First data source for channel 4 - routed to 4Y when S = LOW |
| 12 (4I1) | Channel 4 Data Input 1 | Second data source for channel 4 - routed to 4Y when S = HIGH |
| 13 (3I0) | Channel 3 Data Input 0 | First data source for channel 3 - shares S/E control and timing characteristics |
| 14 (3I1) | Channel 3 Data Input 1 | Second data source for channel 3 - completes full 4×2 input set |
| 15 (VCC) | Positive Supply | Power rail for internal logic and output drivers - must be decoupled locally with 0.1 µF ceramic capacitor |
| 16 (S) | Common Select | Global 1-bit control determining which input pair (I0 or I1) is routed to all four Y outputs |
Key Features
| Feature | Design Value |
|---|---|
| Common select and separate enable | Single S line controls all four channels simultaneously; dedicated E pin allows independent global disable without affecting S or data lines |
| Balanced propagation delay | tPLH and tPHL match within ±3 ns across channels at 6V/50pF - ensures deterministic timing in parallel data paths |
| Wide supply voltage range | 2V–6V operation enables use in mixed-voltage systems (e.g., 3.3V logic controlling 5V peripherals) |
| High noise immunity | 30% VCC noise margin at 5V supply - sustains reliable operation in motor-drive or RF-adjacent PCB layouts |
| Rail-to-rail output swing | VOH ≥ 4.4V and VOL ≤ 0.1V at VCC = 4.5V/IO = ±4mA - ensures full logic-level compatibility with downstream CMOS and TTL stages |
Applications
| Industrial PLC I/O Expansion | Aerospace Avionics Data Routing |
|---|---|
Use Scenario: Multiplexing sensor inputs from multiple analog front-ends into a single ADC channel while maintaining channel isolation. IC Role / Device Role / Timing Role: Quad 2:1 selector routing four differential sensor pairs to shared signal conditioning chain under microcontroller S/E control. Use Value: Reduces component count vs. discrete gate solutions and guarantees matched propagation delay across all four channels for synchronized sampling. |
Use Scenario: Switching between primary and backup flight control data buses in triple-modular-redundant (TMR) architectures. IC Role / Device Role / Timing Role: Non-inverting multiplexer enabling fail-safe bus selection with deterministic <38 ns delay and -55°C to +125°C reliability. Use Value: Eliminates need for custom ASIC routing logic while meeting DO-254 timing and environmental qualification requirements. |
| Test Equipment Signal Path Control | Legacy System Bus Interface Adapter |
Use Scenario: Configuring instrument calibration paths by selecting between reference voltage sources and DUT outputs during automated test sequences. IC Role / Device Role / Timing Role: Logic-controlled analog switch substitute with CMOS-compatible input thresholds and low charge injection. Use Value: Provides predictable digital control of analog signal routing without requiring external level shifters or power supplies beyond system VCC. |
Use Scenario: Bridging 8-bit microprocessor address/data buses to modern peripheral interfaces using programmable select logic. IC Role / Device Role / Timing Role: Quad data selector translating legacy parallel bus signals into configurable memory-mapped register access patterns. Use Value: Enables drop-in replacement of obsolete TTL multiplexers (e.g., SN74LS157) with lower power and extended temperature support. |
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 |
|---|---|---|---|
| CD74HCT157E | Pin-compatible HCT variant with 4.5V–5.5V supply only; TTL-compatible inputs (VIH min = 2.0V, VIL max = 0.8V) | Required where legacy 5V TTL logic drives inputs directly without level translation | Select CD74HCT157E only when interfacing with standard TTL families; otherwise CD74HC157EG4 offers wider voltage flexibility |
| SN74LV157A | LV-family part with 2V–5.5V supply; lower typical propagation delay (15 ns @ 5V/50pF); higher drive strength (±12 mA) | Suitable for high-speed 3.3V systems needing faster switching and stronger output drive than HC logic provides | Choose SN74LV157A for new 3.3V designs prioritizing speed and drive; retain CD74HC157EG4 for 2V–6V interoperability or extended temperature needs |
Compared with CD74HCT157E and SN74LV157A, CD74HC157EG4 uniquely supports 2V operation and full -55°C to +125°C range while maintaining HC-level noise immunity - making it optimal for battery-powered, wide-temperature, or mixed-voltage embedded systems where voltage scalability and ruggedness outweigh raw speed.
Availability
CD74HC157EG4 is available at Aetrix Electronics and suitable for industrial control systems, aerospace data acquisition modules, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC157EG4 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 over 90 years of innovation in high-reliability components.
The CD74HC157EG4 belongs to TI's legacy HC logic portfolio designed for robust, wide-temperature digital interfacing in mission-critical systems - emphasizing parametric consistency, long-term manufacturability, and military-grade environmental resilience.
FAQ
What is the maximum operating voltage for CD74HC157EG4?
The CD74HC157EG4 supports a DC supply voltage range of 2V to 6V. Absolute maximum rating is 7V, but sustained operation above 6V risks permanent damage. At 6V, it achieves minimum propagation delay (21 ns) and full rail-to-rail output swing, making it ideal for 5V systems with margin or mixed-voltage designs where 3.3V logic interfaces with 5V peripherals. Always observe derating curves in the datasheet for high-temperature operation.
Does CD74HC157EG4 have the same pinout as CD74HCT157E?
Yes, CD74HC157EG4 and CD74HCT157E share identical 16-pin PDIP pinouts, including identical placement of E, S, I0/I1 inputs, Y outputs, VCC, and GND. This allows direct substitution in existing PCB layouts when upgrading from HCT to HC logic - provided the system's supply voltage and input logic levels align with HC specifications (2V–6V supply, CMOS-compatible inputs). No board revision is required for pin-compatible replacement.
How does the enable (E) pin function on CD74HC157EG4?
On CD74HC157EG4, the E pin is active-low: when E = HIGH, all four Y outputs are forced LOW regardless of S or input states; when E = LOW, normal multiplexing occurs based on S. This behavior differs from the inverting CD74HC158, where E = HIGH forces Y = HIGH. The active-low enable simplifies integration with microcontroller GPIOs and enables global output blanking in time-critical applications like burst-mode data acquisition.
Can CD74HC157EG4 drive standard TTL loads?
Yes, CD74HC157EG4 is rated for 10 LSTTL loads per output, meaning it can directly drive up to 10 standard TTL inputs without external buffers. This is verified across the full -55°C to +125°C temperature range and at VCC = 4.5V–6V. At 5V supply, VOH ≥ 4.4V and VOL ≤ 0.1V meet TTL VIH (≥2.0V) and VIL (≤0.8V) thresholds with margin, ensuring reliable interfacing with legacy 74LS and 74ALS families in industrial backplanes.
Is CD74HC157EG4 RoHS compliant?
Yes, CD74HC157EG4 is RoHS compliant, as confirmed by Texas Instruments' packaging documentation. The "G4" suffix denotes lead-free finish (NiPdAu) and compliance with EU Directive 2011/65/EU. It uses matte tin or NiPdAu lead finish on PDIP package, with no exemptions applied. Full compliance documentation, including substance declarations and test reports, is available via TI's Quality & Environmental Information portal using orderable part number CD74HC157EG4.
CD74HC157EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74HC157EG4 FAQ
1.How can I place an order for CD74HC157EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC157EG4 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 CD74HC157EG4 reliable?
The price and inventory of CD74HC157EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC157EG4 is usually 5 days.
3.What payment methods are accepted for CD74HC157EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC157EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC157EG4?
CD74HC157EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC157EG4 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 CD74HC157EG4?
For technical support, including CD74HC157EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC157EG4 requirements.
6.How does Aetrix verify that CD74HC157EG4 is sourced from the original manufacturer or authorized distributors?
All CD74HC157EG4 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 CD74HC157EG4 meets industry standards.
7.What is the process for return or replacement of CD74HC157EG4?
All CD74HC157EG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC157EG4, 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 CD74HC157EG4 part is unused and in its original packaging.
Return procedure for CD74HC157EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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