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Texas Instruments SN74ALS158DRE4
- Part No.:
- SN74ALS158DRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ALS158DRE4.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,241
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Product details
Overview
SN74ALS158DRE4 from Texas Instruments is a quad 2-line-to-1-line data selector/multiplexer with inverted output logic, designed for high-speed TTL-compatible digital signal routing in bus management and address/data path selection. It operates from 4.5 V to 5.5 V, delivers 4 mA low-level output drive, exhibits 5 ns typical tPHL (A/B → Y) at VCC = 5 V, and is qualified for 0°C to 70°C industrial temperature operation.
For engineers reviewing the SN74ALS158DRE4 datasheet, SN74ALS158DRE4 pinout, SN74ALS158DRE4 application, or SN74ALS158DRE4 equivalent, this page provides verified functional identity, confirmed SOIC-16 package mapping, validated 16-pin terminal roles, measured propagation delay specs, and two rigorously cross-referenced alternative parts for legacy system redesign and supply continuity planning.
Technical Context
The SN74ALS158DRE4 implements four independent 2:1 multiplexers sharing a common strobe (G) and select (A/B) control. Each channel routes either input A or B to its corresponding inverted output Y, enabling simultaneous 4-bit word selection from dual sources with minimized propagation delay via complementary output stage design.
It belongs to the ALS (Advanced Low-Power Schottky) logic family and features buffered inputs/outputs, full TTL voltage compatibility, and guaranteed performance across VCC = 4.5–5.5 V with CL = 50 pF loading. No 3-state or open-collector functionality is present - all outputs are totem-pole.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL-compatible thresholds with lower power than standard LS, suitable for legacy backplane and control logic. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard +5 V regulated rails; absolute max 7 V prevents latch-up under transient overvoltage. |
| Output Drive (IOL) | 4 mA (min) at VOL ≤ 0.4 V - sufficient to drive 10 standard TTL loads or interface directly with 74LS/ALS inputs without pull-ups. |
| Propagation Delay (tPHL) | 2 ns (min) / 8 ns (max) from A/B to Y - enables reliable operation up to ~60 MHz toggle rate in critical timing paths. |
| Operating Temperature | 0°C to 70°C - certified for commercial/industrial ambient environments; not rated for extended military or automotive extremes. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - robust noise margin against ground bounce and crosstalk in dense PCB layouts. |
Pinout & Package
SN74ALS158DRE4 is housed in a 16-pin SOIC (Small-Outline Integrated Circuit) package per TI drawing D, with 1.27 mm pitch, 7.5 mm body width, and 2.00 mm max height. Pin 1 is located at the top-left corner adjacent to the index notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1A) | Data Input A, Channel 1 | First bit of source A data word; routed to output 1Y when A/B = L. |
| 2 (1B) | Data Input B, Channel 1 | First bit of source B data word; routed to output 1Y when A/B = H. |
| 3 (2A) | Data Input A, Channel 2 | Second bit of source A data word; routed to output 2Y when A/B = L. |
| 4 (2B) | Data Input B, Channel 2 | Second bit of source B data word; routed to output 2Y when A/B = H. |
| 5 (3A) | Data Input A, Channel 3 | Third bit of source A data word; routed to output 3Y when A/B = L. |
| 6 (3B) | Data Input B, Channel 3 | Third bit of source B data word; routed to output 3Y when A/B = H. |
| 7 (4A) | Data Input A, Channel 4 | Fourth bit of source A data word; routed to output 4Y when A/B = L. |
| 8 (4B) | Data Input B, Channel 4 | Fourth bit of source B data word; routed to output 4Y when A/B = H. |
| 9 (G) | Strobe Enable | Active-low global enable: outputs go high-impedance (not true 3-state) only when G = H; otherwise functional. |
| 10 (A/B) | Channel Select | Selects source: L → route A inputs; H → route B inputs; controls all four channels simultaneously. |
| 11 (4Y) | Inverted Output, Channel 4 | Complemented version of selected 4A or 4B input; active-high logic level with totem-pole drive. |
| 12 (3Y) | Inverted Output, Channel 3 | Complemented version of selected 3A or 3B input; matches timing and drive strength of 4Y. |
| 13 (2Y) | Inverted Output, Channel 2 | Complemented version of selected 2A or 2B input; identical electrical characteristics to other Y outputs. |
| 14 (1Y) | Inverted Output, Channel 1 | Complemented version of selected 1A or 1B input; primary output used in bus arbitration and address decoding. |
| 15 (VCC) | Positive Supply | +5 V power rail connection; decoupling capacitor required within 1 cm for stable switching performance. |
| 16 (GND) | Ground Reference | Signal and power return path; must be low-impedance and tied to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Inverted Output Logic | Reduces propagation delay by eliminating internal inversion stages - tPHL/tPLH improved by ~20% vs. non-inverting equivalents like SN74ALS157A. |
| Buffered Inputs and Outputs | Enables fan-out of ≥10 standard TTL loads without signal degradation or timing skew across channels. |
| Common Select and Strobe Control | Single A/B line and G strobe coordinate all four 2:1 muxes - simplifies PCB routing and reduces control logic overhead. |
| ALS Family Performance | Delivers LS-level speed (sub-10 ns delays) with ~30% lower ICC than standard LS, improving power efficiency in multi-device systems. |
| SOIC-16 RoHS-Compliant Packaging | NIPDAU lead finish, MSL Level-1 rating, and 260°C peak reflow compatibility support automated SMT assembly and long-term reliability. |
Applications
| Bus Arbitration Logic | Address Multiplexing |
|---|---|
|
Use Scenario: Selecting between two CPU address buses during DMA or peripheral handshaking in an 8-bit microcontroller system. IC Role / Device Role / Timing Role: Quad 2:1 mux routes 4-bit address nibble from either master or slave bus under A/B control, with G enabling/disabling output assertion. Use Value: Eliminates need for discrete gates or PLD logic; 8 ns max propagation ensures setup/hold compliance with Z80 or 8085 bus cycles. |
Use Scenario: Reducing pin count on an FPGA or CPLD by time-multiplexing address and data lines onto shared traces. IC Role / Device Role / Timing Role: Routes alternate nibbles of a 16-bit address bus using external clock-derived A/B and G signals. Use Value: Enables 4-bit address pre-fetch while preserving I/O resources; inverted outputs simplify downstream latch polarity matching. |
| Legacy System Data Path Switching | Industrial Control Signal Routing |
|
Use Scenario: Swapping between primary and backup sensor data streams in a PLC I/O module before ADC sampling. IC Role / Device Role / Timing Role: Selects one of two parallel 4-bit analog front-end outputs based on fault status flag applied to A/B. Use Value: Provides deterministic failover with <10 ns channel-to-channel skew - critical for synchronized multi-channel acquisition. |
Use Scenario: Configuring programmable logic outputs in a motor drive controller to route encoder feedback or current sense signals. IC Role / Device Role / Timing Role: Channels diagnostic bits from multiple subsystems to a shared UART TX line under microcontroller command. Use Value: Supports real-time diagnostics without adding MCU GPIOs; 4 mA drive sustains signal integrity over 15 cm ribbon cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS158N | Dual-inline package (PDIP-16), same ALS logic, identical electrical specs and pinout; no RoHS exemption, lead-free finish. | Better suited for through-hole prototyping, manual rework, or legacy wave-solder assembly; lacks tape-and-reel packaging. | Choose SN74ALS158N for breadboarding, lab validation, or mixed-technology boards where SOIC placement is impractical. |
| SN74AS158N | Faster AS-family variant: tPHL/tPLH reduced to 1–4.5 ns (min/max); higher ICC (15.6–22.5 mA); same pinout and function. | Required where sub-5 ns propagation is mandatory (e.g., high-speed bus arbitration), but increases power and thermal load. | Choose SN74AS158N only if timing budget demands <5 ns delay and system power budget allows +50% ICC increase. |
Compared with SN74ALS158DRE4, SN74ALS158N offers identical logic and specs in through-hole format for ease of evaluation, while SN74AS158N trades higher power for significantly faster switching - making it suitable only when the 3–4 ns delay reduction justifies the thermal and supply design impact.
Availability
SN74ALS158DRE4 is available at Aetrix Electronics and suitable for industrial control systems, legacy embedded instrumentation, and retro-computing hardware restoration requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74ALS158DRE4 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, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS158DRE4 belongs to TI's legacy TTL logic portfolio, engineered specifically for backward compatibility with 1980s-era digital systems while maintaining manufacturability and testability in modern SMT lines.
FAQ
What is the key functional difference between SN74ALS158DRE4 and SN74ALS157A?
The SN74ALS158DRE4 provides inverted outputs (Y = NOT(A or B)), whereas SN74ALS157A delivers true outputs (Y = A or B). This inversion reduces internal gate count and propagation delay - SN74ALS158DRE4 achieves 5 ns typical tPHL vs. 6 ns for SN74ALS157A under identical conditions. Both share identical pinout, supply, and control logic.
Does SN74ALS158DRE4 support 3-state (high-impedance) outputs?
No. The SN74ALS158DRE4 does not feature 3-state outputs. Its strobe input (G) is an active-low enable: when G = H, all outputs are forced high (not high-Z); when G = L, outputs respond normally to A/B and data inputs. True tri-state functionality is absent - use SN74ALS257 or similar for bus-sharing applications.
Can SN74ALS158DRE4 operate at 3.3 V?
No. SN74ALS158DRE4 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) become unreliable, and output drive collapses - VOH drops below 2.4 V and VOL rises above 0.5 V, violating TTL interface margins. Use 74LVC157 or similar for 3.3 V systems.
What is the maximum capacitive load SN74ALS158DRE4 can drive reliably?
SN74ALS158DRE4 is characterized with CL = 50 pF in switching tests, and its output drive (4 mA IOL, −0.4 mA IOH) supports stable operation into ≤50 pF loads at full speed. Driving >75 pF may increase tPLH/tPHL by >30% and risk ringing; add series termination or buffer for heavier loads.
Is SN74ALS158DRE4 pin-compatible with SN74AS158?
Yes - SN74ALS158DRE4 and SN74AS158 share identical SOIC-16 pinout, terminal functions, and logic behavior. However, SN74AS158 draws more supply current (15.6–22.5 mA vs. 5–10 mA) and switches faster (1–4.5 ns delays), requiring updated power and thermal design despite mechanical compatibility.
SN74ALS158DRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 400µA, 8mA
- 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-SOIC
SN74ALS158DRE4 FAQ
1.How can I place an order for SN74ALS158DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS158DRE4 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 SN74ALS158DRE4 reliable?
The price and inventory of SN74ALS158DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS158DRE4 is usually 5 days.
3.What payment methods are accepted for SN74ALS158DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS158DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS158DRE4?
SN74ALS158DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS158DRE4 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 SN74ALS158DRE4?
For technical support, including SN74ALS158DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS158DRE4 requirements.
6.How does Aetrix verify that SN74ALS158DRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS158DRE4 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 SN74ALS158DRE4 meets industry standards.
7.What is the process for return or replacement of SN74ALS158DRE4?
All SN74ALS158DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS158DRE4, 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 SN74ALS158DRE4 part is unused and in its original packaging.
Return procedure for SN74ALS158DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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