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Texas Instruments SN74AHC157N
- Part No.:
- SN74AHC157N
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AHC157N.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,354
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Product details
Overview
SN74AHC157N from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in 16-pin PDIP package, operating from 2 V to 5.5 V supply, delivering true (non-inverted) output logic with 8 ns propagation delay at 5 V and ±8 mA output drive capability. It serves as a digital signal routing IC in bus management, data path selection, and address decoding circuits.
For engineers reviewing the SN74AHC157N datasheet, SN74AHC157N pinout, SN74AHC157N application, or SN74AHC157N equivalent, key selection criteria include its common strobe (G) control, 4-bit parallel multiplexing function, latch-up immunity (>250 mA), ESD robustness (2000 V HBM), and compatibility with mixed-voltage 3.3 V/5 V systems.
Technical Context
The SN74AHC157N implements four independent 2:1 multiplexers sharing a single active-low strobe (G) input: when G is high, all outputs (1Y–4Y) are forced low; when G is low, the A/B select line determines whether inputs 1A–4A or 1B–4B are routed to corresponding outputs. Its CMOS AHC logic family ensures rail-to-rail swing, low static current (<40 µA), and noise immunity across –40°C to +125°C.
It operates without internal latching-output states follow input changes synchronously with G and A/B, making it suitable for combinational data switching rather than registered control. Input thresholds scale with VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), enabling reliable interfacing with TTL and other CMOS families across its full 2–5.5 V range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports direct interface with both 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tPLH/tPHL) | 4.1 ns (typ) at 5 V, CL = 15 pF - enables high-speed data routing in timing-critical paths up to ~100 MHz. |
| Output Drive Strength | ±8 mA at 5 V - sufficient to drive standard CMOS loads and small capacitive buses without external buffers. |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - provides 0.9 V noise margin against ground bounce or supply ripple. |
| Static Supply Current (ICC) | 40 µA max at 5.5 V - enables low-power operation in battery-backed or always-on subsystems. |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional protection circuitry on PCB. |
Pinout & Package
SN74AHC157N uses a 16-pin Plastic Dual In-Line Package (PDIP) with 19.31 mm × 9.4 mm body size and 0.1 inch lead pitch. Pin 1 is located at the top-left corner (notch side left, dot marking).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A/B) | Address select input | Selects source group: logic low routes A inputs (1A–4A), high routes B inputs (1B–4B) to outputs. |
| 2–3, 5–6, 10–11, 13–14 (1A–1B, 2A–2B, 3A–3B, 4A–4B) | Data inputs | Eight independent data lines grouped into four 2-input channels; no internal cross-talk between channels. |
| 4, 7, 9, 12 (1Y–4Y) | True data outputs | Active-high, non-inverting outputs reflecting selected A or B input; each drives independently. |
| 8 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-impedance connection. |
| 15 (G) | Strobe enable input | Active-low global enable: high forces all outputs low regardless of A/B or data inputs. |
| 16 (VCC) | Power supply | Single positive supply for entire device; requires local 0.1 µF bypass capacitor per VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply voltage range | 2 V to 5.5 V operation allows seamless integration in mixed-voltage systems without level translation. |
| High noise immunity | Input thresholds track VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), ensuring stable switching under supply variation or noise. |
| Low dynamic power | 11 pF typical power dissipation capacitance minimizes switching current and reduces system-level EMI. |
| Robust ESD protection | 2000 V HBM, 1000 V CDM, and 200 V MM ratings eliminate need for external ESD diodes in most industrial layouts. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during transient overvoltage or hot-insertion events. |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Multiplexing sensor inputs (temperature, pressure, position) onto shared ADC channels in programmable logic controllers. IC Role / Device Role / Timing Role: Data selector routing analog front-end signals to a single high-resolution ADC while maintaining channel isolation and timing coherence. Use Value: Reduces component count by eliminating one ADC per sensor and avoids timing skew introduced by sequential sampling. | Use Scenario: Selecting between two CAN transceiver diagnostic data streams (normal vs. test mode) in vehicle body control units. IC Role / Device Role / Timing Role: Signal router enabling real-time switching of diagnostic data paths without interrupting main CAN communication. Use Value: Enables in-field diagnostics without hardware reconfiguration; strobe (G) allows synchronized disable during critical bus arbitration phases. |
| Legacy System Bus Interface | Test Equipment Signal Routing |
Use Scenario: Adapting legacy 5 V microcontroller address/data buses to modern 3.3 V peripheral interfaces in retrofitted instrumentation. IC Role / Device Role / Timing Role: Level-tolerant multiplexer bridging voltage domains while preserving signal integrity and setup/hold timing. Use Value: Eliminates need for discrete level-shifter arrays; AHC logic thresholds ensure correct interpretation of 3.3 V signals at 5 V VCC. | Use Scenario: Configuring automated test equipment (ATE) signal paths to route stimulus or measurement signals among multiple DUT pins. IC Role / Device Role / Timing Role: Reconfigurable data path switch controlled by FPGA GPIO, enabling flexible test sequence execution. Use Value: Reduces test fixture complexity and wiring errors; strobe (G) provides safe "off" state during test transitions to prevent signal contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV157N | Lower VCC range (1.65–5.5 V); higher ICC (100 µA max); slower tPD (12 ns at 5 V) | Better suited for ultra-low-voltage 1.8 V systems; less ideal for high-speed 5 V bus switching | Choose SN74LV157N only if operating below 2 V or requiring enhanced 1.8 V compatibility. |
| 74HC157N | Narrower VCC range (2–6 V); identical pinout and function; slightly higher propagation delay (15 ns at 4.5 V) | Same PCB layout but lower speed margin; reduced noise immunity due to fixed VIH/VIL thresholds | Acceptable drop-in replacement where timing budget allows ≥15 ns delay and 5 V supply stability is assured. |
Compared with SN74LV157N and 74HC157N, the SN74AHC157N delivers superior speed at 5 V, tighter input thresholds for mixed-voltage robustness, and lower static power-making it optimal for industrial and automotive applications demanding reliability and timing precision.
Availability
SN74AHC157N is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, legacy system bus interface, and test equipment signal routing requiring stable component supply and long-term manufacturability.
Supply support for SN74AHC157N 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 50 years of innovation in high-reliability digital ICs.
The SN74AHC157N belongs to TI's Advanced High-Speed CMOS (AHC) logic family, engineered for low-power, high-speed data routing in industrial, automotive, and communications systems where voltage flexibility and noise immunity are critical.
FAQ
What is the maximum operating temperature for the SN74AHC157N?
The SN74AHC157N is rated for operation from –40°C to +125°C ambient temperature. This extended range is validated per JEDEC JESD78 and supports deployment in under-hood automotive environments and industrial enclosures without derating. The PDIP package's thermal resistance (RθJA = 67°C/W) ensures safe junction temperatures within this range under typical load conditions.
Does the SN74AHC157N require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of the SN74AHC157N must be tied to either VCC or GND to prevent floating states that cause excessive current draw and unpredictable output behavior. TI explicitly recommends this in Section 4.3 of the datasheet; leaving inputs unconnected violates recommended operating conditions and may result in increased ICC or functional failure.
Can the SN74AHC157N operate reliably at 2.5 V supply voltage?
Yes - the SN74AHC157N is fully specified down to 2 V, including propagation delay (10.9 ns typ at CL = 50 pF), output drive (±4 mA), and input thresholds (VIH = 1.75 V, VIL = 0.75 V at VCC = 2.5 V). Its AHC logic architecture maintains rail-to-rail swing and noise margins across the entire 2–5.5 V range, making it suitable for battery-powered 2.5 V systems.
Is the SN74AHC157N pin-compatible with older 74LS157 or 74HC157 devices?
The SN74AHC157N shares identical pinout and function with 74HC157 and 74LS157, but differs electrically: it uses CMOS inputs (high impedance, no DC loading) versus TTL inputs (current-sinking), and has different VIH/VIL thresholds. While PCB layout is compatible, direct substitution requires verification of input drive strength and voltage levels in the host system.
What is the purpose of the strobe (G) pin on the SN74AHC157N?
The strobe (G) pin on the SN74AHC157N is an active-low global enable that overrides all channel selections: when G = HIGH, all four outputs (1Y–4Y) are forced LOW regardless of A/B state or input values. This enables synchronized disabling of data paths during system reset, bus arbitration, or power sequencing - a critical feature for glitch-free operation in multi-mux systems.
SN74AHC157N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- 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:
- 8mA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74AHC157N FAQ
1.How can I place an order for SN74AHC157N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC157N 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 SN74AHC157N reliable?
The price and inventory of SN74AHC157N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC157N is usually 5 days.
3.What payment methods are accepted for SN74AHC157N?
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4.How is shipping managed for SN74AHC157N?
SN74AHC157N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC157N 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 SN74AHC157N?
For technical support, including SN74AHC157N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC157N requirements.
6.How does Aetrix verify that SN74AHC157N is sourced from the original manufacturer or authorized distributors?
All SN74AHC157N 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 SN74AHC157N meets industry standards.
7.What is the process for return or replacement of SN74AHC157N?
All SN74AHC157N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC157N, 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 SN74AHC157N part is unused and in its original packaging.
Return procedure for SN74AHC157N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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