SN54HC157-SP - QML-V Quad 2-Line to 1-Line MUX | TI
MPN: SN54HC157-SP β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $25.5 | $25.50 |
| 10 | $23.2 | $232.00 |
| 100 | $20.1 | $2,010.00 |
| 500 | $17.8 | $8,900.00 |
| 1,000 | $15.6 | $15,600.00 |
Drop-in alternatives for SN54HC157-SP β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SN54HC157
β Drop-Inπ Reference alternative (not in catalog)
SN74HC157N
β Drop-Inπ Reference alternative (not in catalog)
CD74HC157E
β Drop-Inπ Reference alternative (not in catalog)
MC74HC157N
β Drop-Inπ Reference alternative (not in catalog)
HEF157BP
β Drop-Inπ Reference alternative (not in catalog)
SN54HC157-SP Maximum Ratings & Electrical Characteristics
| Function | Quadruple 2-Line to 1-Line Data Selector/Multiplexer |
| Supply Voltage Range | 2 V to 6 V |
| Maximum Quiescent Current (ICC) | 80 Β΅A |
| Typical Propagation Delay (tpd) | 11 ns |
| Output Drive Capability | 15 LSTTL loads |
| Operating Temperature Range | -55Β°C to +125Β°C |
| Package Type | CDIP (Ceramic DIP) |
| Qualification | QML-V |
| Radiation Tolerance | Yes (space-grade) |
| Number of Channels | 4 |
| Inputs per Channel | 2 |
| Select Inputs | 1 (common A/B) |
| Strobe Input | 1 (active-low G) |
| Logic Family | HC (High-Speed CMOS) |
| RoHS Status | Compliant |
SN54HC157-SP Pin Configuration
| Pin 1 | A/B β Select input (common to all channels) |
| Pin 2 | 1A β Data input A for channel 1 |
| Pin 3 | 1B β Data input B for channel 1 |
| Pin 4 | 1Y β Output for channel 1 |
| Pin 5 | 2A β Data input A for channel 2 |
| Pin 6 | 2B β Data input B for channel 2 |
| Pin 7 | 2Y β Output for channel 2 |
| Pin 8 | GND β Ground |
| Pin 9 | 3Y β Output for channel 3 |
| Pin 10 | 3B β Data input B for channel 3 |
| Pin 11 | 3A β Data input A for channel 3 |
| Pin 12 | 4Y β Output for channel 4 |
| Pin 13 | 4B β Data input B for channel 4 |
| Pin 14 | 4A β Data input A for channel 4 |
| Pin 15 | G β Strobe input (active-low) |
| Pin 16 | VCC β Positive supply voltage |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SN54HC157-SP is suitable for 6 applications: Spacecraft Telemetry Systems, Redundant System Architectures, Satellite Payload Data Routing, Military Avionics, Industrial Control Systems, Test and Measurement Equipment.
Spacecraft Telemetry Systems
The SN54HC157-SP is ideal for spacecraft telemetry systems where multiple sensor data streams must be multiplexed onto a single communication channel. Its radiation tolerance and QML-V qualification ensure reliable operation in the harsh space environment. The wide operating voltage range (2 V to 6 V) allows direct interfacing with various sensor and logic supplies. The low quiescent current (80 Β΅A max) minimizes power consumption, critical for satellite power budgets. The fast propagation delay (11 ns typical) supports high-speed data acquisition and transmission, ensuring real-time telemetry. The device's ability to drive 15 LSTTL loads provides robust fan-out to downstream processing units.
Recommended
Redundant System Architectures
In redundant systems, the SN54HC157-SP selects between primary and backup data paths, ensuring seamless failover. Its QML-V qualification guarantees high reliability in mission-critical applications. The strobe input (G) allows for bus isolation, preventing conflicts during switchover. The device operates over the full military temperature range (-55Β°C to +125Β°C), making it suitable for extreme environments. The low power consumption is advantageous in battery-powered redundant systems. The multiplexer's fast switching ensures minimal disruption during failover events.
Recommended
Satellite Payload Data Routing
The SN54HC157-SP is used in satellite payloads to switch between different instrument outputs, enabling efficient use of limited downlink bandwidth. Its radiation tolerance is essential for long-duration missions. The wide supply voltage range accommodates various payload power rails. The low ICC (80 Β΅A max) reduces thermal load in the spacecraft. The device's high output drive capability ensures signal integrity over long PCB traces. The QML-V qualification provides confidence in the device's reliability over the mission lifetime.
Recommended
Military Avionics
In military avionics, the SN54HC157-SP is used for data routing in flight control and navigation systems. Its QML-V qualification meets stringent military reliability standards. The device operates over the full -55Β°C to +125Β°C range, suitable for extreme altitude and temperature variations. The low power consumption is critical for aircraft power budgets. The fast propagation delay supports real-time processing requirements. The hermetic CDIP package provides protection against moisture and contaminants.
Recommended
Industrial Control Systems
The SN54HC157-SP can be used in industrial control systems for multiplexing sensor inputs to a central controller. Its wide operating voltage range (2 V to 6 V) allows interfacing with various industrial logic levels. The high noise immunity of CMOS logic ensures reliable operation in electrically noisy environments. The device's low power consumption is beneficial in remote or battery-powered industrial sensors. The fast propagation delay supports high-speed control loops. The QML-V qualification, while overkill for industrial use, provides extra reliability margin.
Recommended
Test and Measurement Equipment
In test and measurement equipment, the SN54HC157-SP is used for routing multiple test signals to a single measurement channel. Its wide bandwidth and fast propagation delay (11 ns typical) ensure accurate signal capture. The low quiescent current reduces heat generation in densely packed instruments. The device's ability to drive 15 LSTTL loads allows connection to various test interfaces. The QML-V qualification ensures long-term reliability in continuous operation. The CDIP package provides stable thermal performance.
Recommended
Recommended Products Summary
Engineering reference data for SN54HC157-SP β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SN54HC157 | SN74HC157N | CD74HC157E | MC74HC157N | HEF157BP |
|---|---|---|---|---|---|---|
| Package | CDIP | CDIP | PDIP | PDIP | PDIP | DIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | NXP Semiconductors |
| Supply Voltage Range | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 2 V to 6 V | 3 V to 15 V |
| Propagation Delay (typical) | 11 ns | 11 ns | 11 ns | 11 ns | 11 ns | 15 ns |
| Maximum Quiescent Current | 80 Β΅A | 80 Β΅A | 80 Β΅A | 80 Β΅A | 80 Β΅A | 80 Β΅A |
| Output Drive Capability | 15 LSTTL loads | 15 LSTTL loads | 15 LSTTL loads | 15 LSTTL loads | 15 LSTTL loads | 10 LSTTL loads |
| Operating Temperature Range | -55Β°C to +125Β°C | -55Β°C to +125Β°C | -40Β°C to +85Β°C | -55Β°C to +125Β°C | -55Β°C to +125Β°C | -40Β°C to +85Β°C |
| Qualification | QML-V | Standard | Standard | Standard | Standard | Standard |
Key Differentiators
- QML-V qualification for space-grade reliability (vs SN54HC157)
- Radiation tolerance for space missions (vs SN74HC157N)
- Wider operating temperature range (vs HEF157BP)
Design Notes
Ensure the supply voltage (VCC) is within the specified 2 V to 6 V range. Use a 0.1 Β΅F decoupling capacitor placed as close as possible to the VCC and GND pins to filter high-frequency noise. For systems with multiple logic devices, consider a bulk capacitor (e.g., 10 Β΅F) on the power rail to handle transient currents.
For high-speed operation, keep traces between the multiplexer and connected logic short to minimize propagation delay and signal integrity issues. Use a ground plane to provide a low-impedance return path. Avoid routing sensitive signals near the select and strobe lines to prevent crosstalk.
The strobe input (G) is active-low; when high, all outputs are forced low. Ensure the strobe is driven to a defined state during power-up to avoid undefined outputs. Also, do not leave unused inputs floating; tie them to VCC or GND to prevent excessive current draw and noise.
Compliance Information
RoHS compliant per TI product page. QML-V qualified for space applications. Not AEC-Q100 qualified as it is not an automotive part.
