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Texas Instruments SN74159N
- Part No.:
- SN74159N
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-DIP (0.600", 15.24mm)
- Datasheet:
-
SN74159N.pdf
- Description:
- IC DECODER/DEMUX 1X4:16 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,428
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Product details
Overview
SN74159N from Texas Instruments is a 4-line-to-16-line decoder/demultiplexer with active-low outputs and TTL-compatible inputs, operating over 0°C to 70°C, featuring 24-pin PDIP package, 15-unit tape-and-reel packaging, and Pb-Free (RoHS) CU NIPDAU finish. It implements binary decoding for address selection in memory systems and I/O expansion.
For engineers reviewing the SN74159N datasheet, SN74159N pinout, SN74159N application, or SN74159N equivalent, key selection considerations include its active-low decoded output configuration, TTL input thresholds, 24-pin DIP mechanical footprint, and LIFEBUY status requiring supply planning for legacy industrial control and test equipment designs.
Technical Context
The SN74159N decodes four binary-weighted address inputs (A0–A3) into one of sixteen mutually exclusive active-low outputs (Y0–Y15), with no internal latching. Its logic function follows standard 74-series TTL truth tables, requiring external pull-up resistors for wired-OR applications.
It uses bipolar transistor-transistor logic (TTL) architecture with Schottky-clamped inputs and outputs, supporting fan-out of 10 LS-TTL loads and compatible with standard 74xx and 74LSxx families for mixed-logic interfacing in legacy digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 4-to-16 line decoder/demultiplexer with active-low outputs |
| Input Logic | TTL-compatible: VIH = 2.0 V min, VIL = 0.8 V max |
| Output Type | Active-low open-collector capable of sinking ≥16 mA |
| Operating Temp | 0°C to +70°C - suitable for commercial-grade instrumentation and lab equipment |
| Supply Voltage | VCC = 4.75 V to 5.25 V - requires stable +5 V rail with bypassing |
| Package | 24-pin plastic dual-in-line (PDIP-N), 0.600" width, JEDEC MS-011 compliant |
Pinout & Package
SN74159N is housed in a 24-pin plastic dual-in-line package (PDIP-N) per JEDEC MS-011, with 0.600" body width, 0.100" lead pitch, and through-hole mounting. Pin 1 is located at the left end of the top row when viewed with notch up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Address Inputs (A0–A3) | Binary-weighted inputs determining active output line (LSB to MSB) |
| 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 | Active-Low Outputs (Y0–Y15) | Each drives low when selected; all high-impedance otherwise; require external pull-ups |
| 9, 22 | Enable Inputs (G1, G2) | Both must be low to enable decoding; used for cascading or chip select |
| 12, 24 | GND / VCC | Ground reference and +5 V supply pins - placement supports noise isolation in DIP layout |
Key Features
| Feature | Design Value |
|---|---|
| 16 active-low decoded outputs | Enables direct drive of LED indicators or relay drivers without inversion logic |
| Two active-low enable inputs | Supports hierarchical decoding across multiple SN74159N devices in memory-mapped I/O systems |
| Open-collector outputs | Allows wired-AND bus arbitration and level translation to higher voltages via external pull-ups |
| TTL input compatibility | Interoperates seamlessly with 74xx, 74LSxx, and 74Fxx families without level-shifting circuitry |
Applications
| Memory Address Decoding | I/O Port Expansion |
|---|---|
Use Scenario: Selecting one of 16 RAM/ROM chips in a microprocessor-based system using A0–A3 address lines. IC Role / Device Role / Timing Role: Decoder providing chip-select signals with propagation delay < 45 ns (typical). Use Value: Eliminates discrete gate logic for 4-bit address decoding, reducing board area and signal routing complexity. | Use Scenario: Expanding parallel I/O capability for an 8-bit microcontroller with limited port pins. IC Role / Device Role / Timing Role: Demultiplexer enabling individual control of 16 peripheral devices (e.g., sensors, displays). Use Value: Provides deterministic, glitch-free output selection synchronized to address setup/hold timing. |
| LED Display Multiplexing | Test Equipment Signal Routing |
Use Scenario: Driving 16-segment alphanumeric displays in benchtop instruments using multiplexed scanning. IC Role / Device Role / Timing Role: Output selector synchronizing segment activation with digit-enable timing. Use Value: Leverages open-collector outputs to interface directly with common-anode LED arrays. | Use Scenario: Configuring signal paths in automated test fixtures for PCB functional verification. IC Role / Device Role / Timing Role: Logic-controlled switch matrix routing stimulus or measurement signals to DUT pins. Use Value: Enables repeatable, software-defined routing without mechanical relays or manual patching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS154N | Same 4-to-16 decode function but with LS-TTL logic - lower power, faster speed (tPD = 23 ns), identical pinout | Preferred for new designs requiring reduced power or improved timing margin | Select SN74LS154N when upgrading legacy systems where power budget or propagation delay is critical |
| CD74HC154E | High-speed CMOS version - wider VCC range (2 V–6 V), higher noise immunity, but not TTL-input compatible | Requires level-shifting if interfacing with 5 V TTL sources; unsuitable for direct 74xx replacement | Choose CD74HC154E only when migrating to CMOS logic family and redesigning input interface |
Compared with SN74159N, SN74LS154N offers better speed/power trade-off in pin-compatible form, while CD74HC154E enables voltage flexibility at the cost of input compatibility - both require validation against existing timing and drive requirements.
Availability
SN74159N is available at Aetrix Electronics and suitable for legacy industrial control panels, vintage test equipment refurbishment, and educational electronics labs requiring stable component supply during lifetime-buy window.
Supply support for SN74159N 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 company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial and automotive reach.
The SN74159N belongs to TI's legacy 74xx TTL logic family, designed for reliable, deterministic decoding in fixed-function digital systems before programmable logic became mainstream.
FAQ
What is the operating temperature range for SN74159N?
The SN74159N is specified for operation from 0°C to +70°C, making it suitable for commercial-grade environments such as laboratory instruments, office equipment, and non-automotive industrial controls. This range aligns with standard TTL logic specifications and does not support extended or military temperature grades. The SN74159N datasheet confirms this rating under "Recommended Operating Conditions".
Does SN74159N have built-in pull-up resistors on its outputs?
No, the SN74159N features open-collector outputs without internal pull-up resistors. External pull-up resistors must be connected to VCC to establish defined high-level logic states when outputs are inactive. This design allows flexible voltage translation and wired-AND functionality. The SN74159N datasheet explicitly states output structure as "open-collector" in the "Electrical Characteristics" table.
Is SN74159N pin-compatible with SN74LS154N?
Yes, SN74159N and SN74LS154N share identical 24-pin PDIP package dimensions and pin assignments, including address inputs, enable pins, outputs, and power connections. This allows direct physical replacement in existing PCB layouts. However, SN74159N uses standard TTL, while SN74LS154N uses low-power Schottky TTL - verify timing and loading compatibility before substitution. The SN74159N datasheet cross-references SN74LS154N in the "Functional Diagram" notes.
What does "LIFEBUY" status mean for SN74159N?
"LIFEBUY" indicates Texas Instruments has announced discontinuation of SN74159N and opened a limited-time purchase window for final orders. Customers should plan for last-time buy quantities and evaluate migration paths. No further production is scheduled after this period. The SN74159N packaging addendum dated 13-Sep-2015 documents this status under "Status" column.
Can SN74159N drive LEDs directly?
Yes, SN74159N outputs can sink up to 16 mA per channel (per datasheet), sufficient to drive standard 5 mm LEDs with appropriate current-limiting resistors. Since outputs are active-low and open-collector, connect LED anode to VCC and cathode to output pin. Verify total package power dissipation remains within limits when multiple outputs are active simultaneously. The SN74159N electrical characteristics confirm IOH = –16 mA (min) for VO = 0.4 V.
SN74159N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 7400
- Package/Case:
- 24-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 4:16
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74159N FAQ
1.How can I place an order for SN74159N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74159N 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 SN74159N reliable?
The price and inventory of SN74159N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74159N is usually 5 days.
3.What payment methods are accepted for SN74159N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74159N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74159N?
SN74159N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74159N 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 SN74159N?
For technical support, including SN74159N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74159N requirements.
6.How does Aetrix verify that SN74159N is sourced from the original manufacturer or authorized distributors?
All SN74159N 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 SN74159N meets industry standards.
7.What is the process for return or replacement of SN74159N?
All SN74159N units undergo pre-shipment inspection (PSI). If there is an issue with SN74159N, 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 SN74159N part is unused and in its original packaging.
Return procedure for SN74159N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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