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Texas Instruments SN74ALS151NSR
- Part No.:
- SN74ALS151NSR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS151NSR.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,989
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Product details
Overview
SN74ALS151NSR from Texas Instruments is an 8-line to 1-line TTL-compatible data selector/multiplexer with active-low enable (G), three binary select inputs (A, B, C), eight data inputs (D0–D7), and complementary outputs (Y and W). It operates over 0°C to 70°C, supports 5 V supply, delivers ±24 mA output drive, and achieves propagation delays as low as 3 ns (D→Y) under loaded conditions. It serves in digital logic systems requiring flexible signal routing, such as address decoding in microprocessor peripherals.
For engineers reviewing the SN74ALS151NSR datasheet, SN74ALS151NSR pinout, SN74ALS151NSR application, or SN74ALS151NSR equivalent, key selection considerations include its 16-pin SOP (NS) package, ALS family speed-power trade-off, dual-output (true/inverted) capability, and compatibility with standard 5 V TTL logic families in legacy and industrial control designs.
Technical Context
The SN74ALS151NSR implements full binary decoding of three select lines (A, B, C) to route one of eight data inputs (D0–D7) to the true output (Y) when the strobe (G) is low; the inverted output (W) mirrors Y's logic state. Its internal architecture uses bipolar ALS (Advanced Low-Power Schottky) transistor technology, delivering higher speed than LS while maintaining lower power than AS.
Input clamping diodes are integrated on all data and select inputs to simplify system-level ESD protection and reduce external component count. The device features totem-pole outputs-no open-collector configuration-and does not support 3-state operation; both Y and W remain actively driven at all times during enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Operates reliably across standard 5 V rail tolerances without regulation overhead. |
| Propagation Delay (D→Y) | 3 ns (min) to 10 ns (max) - Enables high-speed multiplexing in 20+ MHz synchronous logic paths. |
| Output Drive (IOL/IOH) | 24 mA sink / −2.6 mA source - Directly drives multiple 74ALS inputs or small LED loads without buffering. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded systems, instrumentation, and industrial controllers. |
| Input Voltage Thresholds | VIL = 0.8 V max, VIH = 2.0 V min - Ensures robust noise margin (>0.4 V) against TTL-level signal degradation. |
| Package Type | SOP-16 (NS) - Surface-mount, 1.27 mm pitch, 10.4 mm × 5.3 mm footprint, RoHS-compliant NIPDAU finish. |
Pinout & Package
SOP-16 (NS) package: 16-pin small-outline plastic package with gull-wing leads, 1.27 mm pitch, 10.4 mm × 5.3 mm body, 2.00 mm max height, and moisture sensitivity level 1 (260°C reflow compatible).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D0) | Data Input 0 | Low-order data source selected when A=B=C=0; internally connected to Y/W logic array. |
| 2 (D1) | Data Input 1 | Second data source enabled when A=1, B=C=0; shares same internal decode path as D0–D7. |
| 3 (D2) | Data Input 2 | Third data input; routed to Y/W only when select code equals binary 010. |
| 4 (D3) | Data Input 3 | Active when A=B=1, C=0; no internal pull-up/down; requires external logic-level sourcing. |
| 5 (D4) | Data Input 4 | Selected at A=0, B=C=1; electrically identical to D0–D3 in DC and AC specs. |
| 6 (D5) | Data Input 5 | Enabled at A=1, B=0, C=1; supports same VIH/VIL and switching performance as other D inputs. |
| 7 (D6) | Data Input 6 | Activated when A=B=0, C=1; clamped by internal diode to GND for transient suppression. |
| 8 (D7) | Data Input 7 | High-order input selected at A=B=C=1; shares identical timing and loading characteristics. |
| 9 (C) | Select Input C | Most-significant address bit for 3-bit decode; directly gates internal AND-OR logic tree. |
| 10 (B) | Select Input B | Mid-significance select line; synchronized with A and C for glitch-free output transitions. |
| 11 (A) | Select Input A | Least-significant select bit; propagation delay to Y matches B/C within ±1 ns. |
| 12 (G) | Strobe (Enable) | Active-low global enable; forces Y=low, W=high when high - no partial enable mode. |
| 13 (W) | Inverted Output | Complementary to Y; driven simultaneously with Y; no separate enable or tri-state control. |
| 14 (Y) | True Output | Main multiplexed output; reflects selected Dn when G=low; fully buffered, low-impedance. |
| 15 (VCC) | Power Supply | +5 V supply pin; bypass capacitor recommended within 10 mm for stable switching operation. |
| 16 (GND) | Ground Reference | Logic and power return; must be low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary Outputs (Y/W) | Provides true and inverted data simultaneously - eliminates need for external inverters in bus arbitration or parity generation. |
| Integrated Input Clamping Diodes | Reduces external TVS or resistor networks for I/O protection - lowers BOM count and PCB area in noisy industrial environments. |
| ALS Logic Family Performance | Delivers 18 ns max tPHL (A→Y) at 5 V - 2× faster than 74LS151 while consuming ~30% less quiescent current (ICC = 12 mA max). |
| Standard 16-Pin Pinout Compatibility | Shares identical pin assignment with SN74LS151, SN74AS151, and SN74F151 - enables drop-in replacement in existing layouts. |
| Commercial Temperature Range | Validated from 0°C to 70°C - suitable for non-military embedded systems where extended temperature range is unnecessary. |
Applications
| Microprocessor Address Decoding | Digital Function Generation |
|---|---|
|
Use Scenario: Selecting between eight peripheral memory or I/O chip select lines using three address bits and a chip-enable strobe. IC Role / Device Role / Timing Role: Acts as address-space partitioner - maps A0–A2 and /CE to discrete /CS outputs for RAM, ROM, UART, and timer ICs. Use Value: Eliminates discrete gate logic for 3-to-8 decoding; reduces propagation delay vs. NAND-based decoders by >5 ns per stage. |
Use Scenario: Implementing arbitrary 3-variable Boolean functions (e.g., XOR, majority vote, parity) using D0–D7 as truth table entries. IC Role / Device Role / Timing Role: Functions as programmable logic block - D0–D7 pins set function constants; A/B/C serve as variable inputs. Use Value: Achieves full combinational logic in single package with <10 ns worst-case delay - avoids CPLD/FPGA overhead for simple glue logic. |
| Parallel-to-Serial Data Conversion | Multi-Source Data Selection |
|
Use Scenario: Converting 8-bit parallel status data (e.g., sensor bank outputs) into time-multiplexed serial stream for microcontroller ADC input. IC Role / Device Role / Timing Role: Serves as clock-synchronized data router - A/B/C driven by counter, G tied to sample pulse, Y fed to ADC sample-hold. Use Value: Enables 8-channel monitoring with single ADC channel; maintains 100+ kHz sampling rate due to sub-15 ns propagation. |
Use Scenario: Choosing among eight analog front-end channels (e.g., thermocouple, RTD, voltage) before feeding shared signal conditioning chain. IC Role / Device Role / Timing Role: Performs analog signal path selection - D0–D7 accept buffered analog signals (<1 Vpp), Y drives amplifier input. Use Value: Supports rail-to-rail 5 V CMOS/TTL-compatible logic control of analog muxes; avoids level-shifting circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-to-1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS151N | Slower (tPHL up to 25 ns), higher ICC (18 mA), same pinout and logic function. | Better noise immunity at lower speeds; unsuitable for >10 MHz clocked systems. | Choose for cost-sensitive, low-frequency designs where ALS speed is unnecessary. |
| SN74AS151NSR | Faster (tPHL down to 4.5 ns), higher drive (48 mA sink), same SOP-16 package and pinout. | Higher power consumption (ICC = 30 mA); requires tighter thermal management. | Choose when minimum propagation delay is critical and board layout supports added power dissipation. |
Compared with SN74LS151N and SN74AS151NSR, the SN74ALS151NSR delivers optimal balance of speed (18 ns max delay), power (12 mA ICC), and noise margin - making it ideal for mid-speed industrial control and legacy computer peripheral interfaces where thermal headroom and timing margins are constrained.
Availability
SN74ALS151NSR is available at Aetrix Electronics and suitable for microprocessor address decoding, digital function generation, parallel-to-serial conversion, and multi-source data selection requiring stable component supply, long-term obsolescence mitigation, and RoHS-compliant manufacturing.
Supply support for SN74ALS151NSR 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 U.S.-based semiconductor innovator founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS151NSR belongs to TI's legacy 74ALS logic family, designed specifically for high-reliability commercial systems needing improved speed-power efficiency over 74LS while retaining full pin and functional compatibility.
FAQ
What is the maximum operating frequency supported by the SN74ALS151NSR?
The SN74ALS151NSR does not specify a maximum clock frequency in its datasheet because it is a combinational logic device without an internal clock. However, based on its worst-case propagation delay of 24 ns (tPHL from select input to Y), it can reliably operate in systems with data valid windows exceeding 25 ns - supporting effective multiplexing rates up to approximately 40 MHz in synchronous designs with proper setup/hold timing.
Does the SN74ALS151NSR support 3-state or high-impedance output mode?
No, the SN74ALS151NSR does not support 3-state operation. Its Y and W outputs are always actively driven - Y reflects the selected input when G is low, and both Y and W are forced to fixed logic states (Y = low, W = high) when G is high. For bus-sharing applications requiring high-impedance control, designers must use external tri-state buffers or select a different multiplexer family such as the 74ALS251.
Can the SN74ALS151NSR be used with 3.3 V logic systems?
The SN74ALS151NSR is specified only for 4.5 V to 5.5 V operation and is not 3.3 V tolerant. Driving its inputs with 3.3 V signals may result in marginal VIH compliance (VIH min = 2.0 V), but output levels will not interface safely with 3.3 V receivers due to VOH ≈ 3.2 V minimum - risking overvoltage stress. Use level translators or a 3.3 V–compatible multiplexer like SN74LVC151 if interfacing with modern low-voltage logic.
What is the meaning of the 'NS' in SN74ALS151NSR?
The 'NS' in SN74ALS151NSR denotes the package type: SOP (Small Outline Package) with 16 pins and 1.27 mm lead pitch. This is distinct from 'D' (SOIC), 'N' (PDIP), and 'J' (CDIP) variants. The 'R' suffix indicates tape-and-reel packaging (2000 units per reel), and the device is RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating.
How does the SN74ALS151NSR differ from the SN74ALS151DR?
The SN74ALS151NSR and SN74ALS151DR share identical electrical specifications and logic functionality but differ in package: NSR uses SOP-16 (NS) with 1.27 mm pitch and 10.4 mm × 5.3 mm body, while DR uses SOIC-16 (D) with same pin count but slightly smaller 8.1 mm × 3.9 mm footprint and 1.27 mm pitch. Both are RoHS-compliant, but NSR has higher thermal resistance and is optimized for cost-sensitive, high-volume assembly.
SN74ALS151NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 1 x 8:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74ALS151NSR FAQ
1.How can I place an order for SN74ALS151NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS151NSR 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 SN74ALS151NSR reliable?
The price and inventory of SN74ALS151NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS151NSR is usually 5 days.
3.What payment methods are accepted for SN74ALS151NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS151NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS151NSR?
SN74ALS151NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS151NSR 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 SN74ALS151NSR?
For technical support, including SN74ALS151NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS151NSR requirements.
6.How does Aetrix verify that SN74ALS151NSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS151NSR 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 SN74ALS151NSR meets industry standards.
7.What is the process for return or replacement of SN74ALS151NSR?
All SN74ALS151NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS151NSR, 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 SN74ALS151NSR part is unused and in its original packaging.
Return procedure for SN74ALS151NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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