My Inquiry
My Account
Texas Instruments SN74LS151NSR
- Part No.:
- SN74LS151NSR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS151NSR.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,555
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LS151NSR from Texas Instruments is a 8-line to 1-line TTL multiplexer with active-low enable (E̅), three address inputs (A, B, C), eight data inputs (I₀–I₇), and complementary outputs (Y and Y̅). It operates at 0°C to 70°C, supports 16-pin SOP (NS) packaging, and delivers typical propagation delay of 22 ns at VCC = 5 V. It is used in digital logic selection, data routing, and address decoding in legacy industrial control systems.
For engineers reviewing the SN74LS151NSR datasheet, SN74LS151NSR pinout, SN74LS151NSR application, or SN74LS151NSR equivalent, key selection criteria include its TTL-compatible input thresholds, complementary output drive capability, single-supply 5-V operation, and compatibility with LS-family timing and loading specifications.
Technical Context
The SN74LS151NSR implements a standard 3-to-8 binary decoder driving eight AND gates, whose outputs feed a wired-OR summing node to produce Y, with Y̅ provided via an internal inverter. Its E̅ input enables or disables all data paths synchronously, forcing Y = HIGH and Y̅ = LOW when asserted.
Designed for direct interface with other 74LS-series devices, it features input clamp diodes, guaranteed fan-out of 20 LS-TTL loads, and output drive strength of –0.4 mA (HIGH) and 8 mA (LOW) under nominal conditions. No internal latching or clocking is present - operation is purely combinational.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL) - ensures interoperability with legacy LS-based systems and predictable DC/AC loading behavior. |
| Function | 8:1 Data Multiplexer - selects one of eight digital inputs based on A/B/C address bits and outputs it on Y/Y̅ when E̅ = LOW. |
| VCC Range | 4.75 V to 5.25 V - requires tightly regulated +5 V supply; not tolerant of wider voltage excursions or 3.3 V operation. |
| tPD (max) | 34 ns - defines worst-case signal path delay from address/data change to stable Y/Y̅ output, critical for synchronous bus timing. |
| IOH/IOL | –0.4 mA / 8 mA - specifies drive capability into LS-TTL inputs; limits fan-out but avoids excessive board-level current draw. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating; unsuitable for extended-temperature or military applications without derating. |
| Package | SOP (NS), 16-pin - surface-mount variant with 1.27 mm pitch, 10.4 mm × 5.3 mm body, and 2.00 mm max height for PCB space-constrained designs. |
Pinout & Package
SOP (NS) package: 16-pin small-outline plastic package with gull-wing leads, 1.27 mm pitch, 10.4 mm × 5.3 mm body size, and 2.00 mm maximum height. Pin 1 marked by beveled corner or notch orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E̅) | Active-low Enable | When HIGH, forces Y = HIGH and Y̅ = LOW regardless of address/data; required LOW to activate multiplexing function. |
| 2–4 (I₀–I₂) | Data Inputs | Low-order data inputs routed to Y when A=0, B=0, C=0 (I₀), etc.; TTL-compatible voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
| 5 (Y) | True Output | Active-HIGH selected data output; open-collector capable only if externally pulled up - standard totem-pole output. |
| 6 (Y̅) | Inverted Output | Complementary to Y; provides simultaneous true/inverted signals without external inversion, reducing component count. |
| 7–9 (I₃–I₅) | Data Inputs | Mid-range data inputs; electrically identical to I₀–I₂, supporting full 8-input selection matrix. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output drivers; must be low-impedance and decoupled near device. |
| 11–13 (I₆–I₇, A) | Data Input / Address LSB | I₆ and I₇ complete the 8-input set; A is least-significant address bit determining LSB of 3-bit select code. |
| 14 (B) | Address Bit | Middle address bit; combined with A and C forms full 3-bit binary select word (CBA) for input selection. |
| 15 (C) | Address MSB | Most-significant address bit; determines upper/lower half of input group (I₀–I₃ vs. I₄–I₇). |
| 16 (VCC) | Power Supply | +5 V DC supply pin; requires local 0.1 µF ceramic decoupling capacitor between VCC and GND for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary outputs (Y and Y̅) | Eliminates need for external inverters in applications requiring both polarities - reduces BOM count and layout area. |
| Active-low enable (E̅) | Allows hierarchical multiplexing or system-level gating; multiple SN74LS151NSR devices can share address lines while being individually enabled. |
| TTL-compatible input thresholds | Ensures reliable interfacing with 74LS, 74S, and 74F families without level-shifting; VIH ≥ 2.0 V and VIL ≤ 0.8 V are guaranteed. |
| Standard 16-pin SOP footprint | Enables drop-in replacement for other 74LS151 variants in surface-mount designs; matches JEDEC MS-012 outline NS0016A. |
| 20-LS-TTL fan-out capability | Supports driving multiple downstream TTL inputs without buffers, simplifying inter-stage connectivity in dense logic arrays. |
Applications
| Industrial Control Logic | Legacy Test Equipment |
|---|---|
|
Use Scenario: Selecting sensor input channels (e.g., thermocouple, pressure, flow) in a modular PLC backplane where only one channel is sampled per cycle. IC Role / Device Role / Timing Role: SN74LS151NSR acts as the analog front-end digital selector, routing conditioned signals to a shared ADC based on microcontroller-generated address bits. Use Value: Reduces component count versus discrete gate-based selectors and maintains timing predictability with fixed 34 ns propagation delay across all selections. |
Use Scenario: Configuring stimulus patterns in automated test fixtures for vintage TTL-based digital boards. IC Role / Device Role / Timing Role: SN74LS151NSR serves as pattern generator core, selecting preloaded test vectors stored across eight parallel latches to drive DUT inputs. Use Value: Enables rapid vector switching (<34 ns) synchronized to system clock edges, ensuring deterministic setup/hold margins for legacy ICs under test. |
| Computer Bus Arbitration | EPROM Address Decoding |
|
Use Scenario: Resolving contention among multiple peripheral controllers sharing a common data bus in retrocomputing expansion systems. IC Role / Device Role / Timing Role: SN74LS151NSR functions as dynamic bus grant router, forwarding control signals from master CPU to one of eight peripheral slots based on slot ID. Use Value: Provides glitch-free handoff using complementary outputs and enable-controlled isolation, preventing bus contention during arbitration transitions. |
Use Scenario: Mapping 16-bit address space to select among multiple EPROM chips in early microcomputer memory subsystems. IC Role / Device Role / Timing Role: SN74LS151NSR decodes upper address bits (A₁₃–A₁₅) to assert chip-select lines for up to eight ROM devices. Use Value: Delivers consistent 34 ns CS assertion delay across all devices, preserving strict address decode timing required by NMOS EPROMs with tight access windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS151N | Same logic function and electrical specs, but in 16-pin PDIP (N) through-hole package; no RoHS exemption, NIPDAU finish. | Preferred for prototyping, breadboarding, or repair of legacy through-hole PCBs; incompatible with SOP-reflow assembly. | Select SN74LS151N only when manual soldering or socket-based deployment is required. |
| SN74LS151DR | Identical functionality and AC/DC specs, but in SOIC (D) package with 1.27 mm pitch, 2500-piece tape-and-reel, and Level-1 MSL rating. | Optimized for high-volume automated SMT lines; slightly larger body (10.3 mm × 5.3 mm) than NS package but same pinout. | Choose SN74LS151DR for production runs requiring JEDEC-standard SOIC compatibility and higher reel quantities. |
Compared with SN74LS151N and SN74LS151DR, the SN74LS151NSR offers identical logic behavior and timing but occupies minimal PCB area due to its narrower SOP-NS body (10.4 mm × 5.3 mm), making it optimal for space-constrained industrial modules where fine-pitch handling is available.
Availability
SN74LS151NSR is available at Aetrix Electronics and suitable for industrial control logic, legacy test equipment, computer bus arbitration, and EPROM address decoding requiring stable component supply across long-lifecycle embedded programs.
Supply support for SN74LS151NSR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
The SN74LS151NSR belongs to TI's legacy 74LS logic family, engineered for reliability and interoperability in commercial-grade digital systems where predictable timing, robust noise immunity, and backward compatibility are essential.
FAQ
What is the maximum operating frequency of the SN74LS151NSR?
The SN74LS151NSR is a combinational logic device without an internal clock, so it has no defined maximum operating frequency. Its usable speed is governed by propagation delay (tPD = 34 ns max) and system-level setup/hold timing constraints. In practice, it reliably supports data selection rates up to approximately 10–15 MHz in well-designed TTL systems with controlled trace lengths and proper termination.
Can the SN74LS151NSR operate from a 3.3 V supply?
No, the SN74LS151NSR is specified only for 4.75 V to 5.25 V operation. Applying 3.3 V will result in undefined logic states, degraded noise margins, and potential failure to meet output drive or propagation delay specifications. For 3.3 V systems, consider modern alternatives like SN74LVC151 or level-shifting interfaces.
Does the SN74LS151NSR have ESD protection diodes on its inputs?
Yes, the SN74LS151NSR includes internal input clamp diodes to VCC and GND, providing basic ESD protection per MIL-STD-883 Class 3B (±2 kV HBM). However, it lacks dedicated high-energy ESD structures - external protection is recommended in harsh environments or handling-intensive assembly processes.
Is the SN74LS151NSR pin-compatible with CMOS 4051 multiplexers?
No, the SN74LS151NSR is not pin-compatible with the CD4051 or other CMOS analog multiplexers. It uses a different pinout (e.g., E̅ on Pin 1, Y on Pin 5, Y̅ on Pin 6), operates on TTL voltage levels, and performs digital - not analog - signal selection. Interchange requires full schematic and layout revision.
What does the "NS" in SN74LS151NSR signify?
The "NS" denotes the SOP (Small Outline Plastic) package type per TI's packaging nomenclature. It identifies the 16-pin, gull-wing, surface-mount variant with 1.27 mm lead pitch and JEDEC MS-012 outline NS0016A - distinct from PDIP (N), SOIC (D), or ceramic packages used by other SN74LS151 variants.
SN74LS151NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- 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:
- 400µA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74LS151NSR FAQ
1.How can I place an order for SN74LS151NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS151NSR 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 SN74LS151NSR reliable?
The price and inventory of SN74LS151NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS151NSR is usually 5 days.
3.What payment methods are accepted for SN74LS151NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS151NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS151NSR?
SN74LS151NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS151NSR 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 SN74LS151NSR?
For technical support, including SN74LS151NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS151NSR requirements.
6.How does Aetrix verify that SN74LS151NSR is sourced from the original manufacturer or authorized distributors?
All SN74LS151NSR 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 SN74LS151NSR meets industry standards.
7.What is the process for return or replacement of SN74LS151NSR?
All SN74LS151NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS151NSR, 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 SN74LS151NSR part is unused and in its original packaging.
Return procedure for SN74LS151NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LS151NSR Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
