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Texas Instruments SN74AHC157DBR
- Part No.:
- SN74AHC157DBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHC157DBR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,937
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Product details
Overview
SN74AHC157DBR from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in SSOP-16 package, operating from 2 V to 5.5 V supply, with 8 ns typical propagation delay at 5 V, ±8 mA output drive, and true (non-inverted) data routing. It serves as a digital signal routing IC in bus management, data path selection, and logic-level translation circuits within industrial control and instrumentation systems.
For engineers reviewing the SN74AHC157DBR datasheet, SN74AHC157DBR pinout, SN74AHC157DBR application, or SN74AHC157DBR equivalent, key selection criteria include its active-low strobe (G) control, A/B address select input, four independent 2:1 multiplexed outputs (1Y–4Y), and compatibility with mixed-voltage 3.3 V/5 V logic interfaces.
Technical Context
The SN74AHC157DBR implements four independent 2:1 multiplexers sharing a common active-low strobe (G) and a single address select (A/B) input. When G is high, all outputs are forced low regardless of inputs; when G is low, the A/B signal selects either the "A" or "B" input set for each channel, routing it to the corresponding Y output without inversion.
This device uses advanced CMOS (AHC) technology, delivering rail-to-rail output swing, low static current (≤40 µA at 5.5 V), and robust ESD protection (±2000 V HBM). Its switching characteristics are specified across –40°C to +125°C, supporting operation in extended-temperature industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 5.5 V - supports direct interface with both 3.3 V and 5 V logic families without level shifters. |
| Propagation Delay | 4.1 ns (typ) at 5 V, CL = 15 pF - enables use in high-speed digital control paths up to ~100 MHz toggle rate. |
| Output Drive | ±8 mA at 5 V - sufficient to drive standard TTL loads or multiple CMOS inputs without buffering. |
| Input Thresholds | VIL = 1.65 V, VIH = 3.85 V at VCC = 5.5 V - provides 0.85 V noise margin for reliable 5 V logic interpretation. |
| Quiescent Current | 40 µA max at 5.5 V - enables low-power standby operation in battery-backed or energy-sensitive systems. |
| ESD Rating | ±2000 V HBM - meets industrial handling requirements without additional board-level protection. |
Pinout & Package
SN74AHC157DBR is housed in a 16-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, body size 6.20 mm × 5.30 mm, and JEDEC MO-153 compliant footprint. The package is RoHS-compliant, moisture sensitivity level 1, and rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A/B) | Address select input | Controls source selection: logic low routes 1A–4A to outputs; logic high routes 1B–4B. |
| 2–3, 5–6, 10–11, 13–14 (1A/1B, 2A/2B, 3A/3B, 4A/4B) | Data inputs | Eight parallel data inputs grouped into four 2-input channels; no internal pull-ups/pull-downs. |
| 4, 7, 9, 12 (1Y–4Y) | True data outputs | Four buffered, non-inverting outputs; each reflects selected A or B input when strobe is active low. |
| 8 (GND) | Ground reference | Primary return path for all signals and power; must be low-impedance connection to system ground plane. |
| 15 (G) | Active-low strobe | Global enable: high forces all outputs low; low enables multiplexer function per A/B state. |
| 16 (VCC) | Positive supply | Single power rail (2–5.5 V); requires local 0.1 µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2 V to 5.5 V operation allows interoperability across legacy 5 V and modern 3.3 V subsystems without voltage translation. |
| True output logic | Outputs replicate selected input without inversion - eliminates need for external inverters in signal routing paths. |
| Low power consumption | ICC ≤ 40 µA at 5.5 V ensures minimal quiescent load on power rails during idle or standby states. |
| High noise immunity | Guaranteed 0.85 V input hysteresis at 5.5 V supply supports reliable operation in electrically noisy industrial environments. |
| Strobe-controlled disable | Active-high G input forces all outputs low independently of A/B state - simplifies bus arbitration and power sequencing. |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Signal Routing |
|---|---|
Use Scenario: Selecting between primary and backup sensor inputs in a programmable logic controller rack module. IC Role / Device Role / Timing Role: Data selector routing analog-to-digital converter outputs or discrete I/O status lines to a shared microcontroller bus. Use Value: Enables dual-redundant input monitoring with single-chip logic, reducing PCB area and interconnect complexity versus discrete gate solutions. | Use Scenario: Switching stimulus signals between multiple DUT (device under test) channels in automated test equipment. IC Role / Device Role / Timing Role: High-speed multiplexer controlling which test pattern generator drives a specific DUT pin during functional validation. Use Value: Provides sub-10 ns channel switching with deterministic timing, eliminating skew-induced measurement errors in multi-channel parametric testing. |
| Embedded System Bus Arbitration | Legacy Interface Level Translation |
Use Scenario: Sharing a single UART or SPI peripheral between two host processors in a failover-capable embedded design. IC Role / Device Role / Timing Role: Bidirectional data path selector managing transmit/receive line routing based on processor activity and priority flags. Use Value: Delivers glitch-free bus handoff using synchronous strobe gating, avoiding metastability risks associated with asynchronous switches. | Use Scenario: Interfacing a 3.3 V FPGA I/O bank to legacy 5 V peripherals such as EEPROMs or displays. IC Role / Device Role / Timing Role: Logic-level translator enabling bidirectional data flow while maintaining voltage domain isolation and timing integrity. Use Value: Eliminates need for dedicated level-shifter ICs by leveraging native 2–5.5 V input tolerance and rail-swing outputs compatible with both domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC157APWR | Lower VCC min (1.65 V), higher max output drive (±24 mA), slightly faster tPD (3.5 ns typ at 3.3 V). | Better suited for 1.8 V/3.3 V mixed-signal systems; less tolerant of 5 V-only designs due to absolute max VI = 5.5 V but not 5 V-tolerant inputs. | Select when interfacing with sub-2 V logic or requiring higher fan-out; verify input voltage compatibility in 5 V environments. |
| 74HC157D,653 | Slower propagation (18 ns typ at 4.5 V), wider VCC range (2–6 V), higher ICC (≤80 µA), same pinout and function. | Compatible with 6 V legacy systems; higher static power and lower speed limit use in high-frequency or ultra-low-power applications. | Choose for cost-sensitive, non-speed-critical 5 V designs where AHC's speed and low ICC are unnecessary. |
Compared with SN74LVC157APWR and 74HC157D,653, the SN74AHC157DBR delivers optimal balance of speed, low power, and 5 V tolerance - making it preferred for industrial 3.3 V/5 V hybrid systems requiring reliable, low-glitch signal routing without level-shifting overhead.
Availability
SN74AHC157DBR is available at Aetrix Electronics and suitable for industrial control, automated test equipment, embedded bus arbitration, and legacy interface translation requiring stable component supply and long-term production continuity.
Supply support for SN74AHC157DBR 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHC157DBR belongs to TI's AHC logic family, designed for high-speed, low-power, mixed-voltage digital signal routing in industrial automation, test instrumentation, and embedded computing applications.
FAQ
What is the maximum operating temperature for SN74AHC157DBR?
The SN74AHC157DBR is rated for continuous operation from –40°C to +125°C ambient temperature, meeting extended industrial temperature requirements. This rating applies specifically to the DB (SSOP) package variant and is validated per JEDEC JESD22-A108 thermal stress testing protocols.
Does SN74AHC157DBR support 5 V-tolerant inputs when powered from 3.3 V?
Yes, SN74AHC157DBR supports 5 V-tolerant inputs across its full 2 V to 5.5 V supply range. When VCC = 3.3 V, inputs may swing up to 5.5 V without damage or functional degradation, enabling safe interfacing with 5 V signal sources without external clamping or level-shifting circuitry.
Can SN74AHC157DBR outputs drive a 50 pF capacitive load at 50 MHz?
No - while SN74AHC157DBR specifies switching performance up to 15 pF load, driving 50 pF at 50 MHz exceeds its guaranteed timing margins. At CL = 50 pF and VCC = 5 V, tPLH/tPHL max is 9.5 ns, limiting reliable operation to ≤50 MHz only with very short traces and minimal additional capacitance; for robust 50 MHz use, reduce load or add a buffer stage.
Is SN74AHC157DBR pin-compatible with older 74LS157 devices?
No, SN74AHC157DBR is not pin-compatible with 74LS157. Although both are 16-pin multiplexers with identical logic function, the LS variant uses a different pinout: G (strobe) is on pin 1 in LS157 but on pin 15 in SN74AHC157DBR, and A/B is on pin 15 in LS157 versus pin 1 here. PCB redesign is required for replacement.
What is the recommended bypass capacitor for SN74AHC157DBR?
A 0.1 µF X7R ceramic capacitor placed as close as possible to the VCC (pin 16) and GND (pin 8) pins is the recommended bypass solution for SN74AHC157DBR. For systems with multiple logic devices on the same rail, adding a bulk 1 µF–10 µF tantalum or aluminum electrolytic capacitor nearby further stabilizes supply ripple under dynamic switching loads.
SN74AHC157DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
SN74AHC157DBR FAQ
1.How can I place an order for SN74AHC157DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC157DBR 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 SN74AHC157DBR reliable?
The price and inventory of SN74AHC157DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC157DBR is usually 5 days.
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SN74AHC157DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC157DBR 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 SN74AHC157DBR?
For technical support, including SN74AHC157DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC157DBR requirements.
6.How does Aetrix verify that SN74AHC157DBR is sourced from the original manufacturer or authorized distributors?
All SN74AHC157DBR 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 SN74AHC157DBR meets industry standards.
7.What is the process for return or replacement of SN74AHC157DBR?
All SN74AHC157DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC157DBR, 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 SN74AHC157DBR part is unused and in its original packaging.
Return procedure for SN74AHC157DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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