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Texas Instruments SN74F253D
- Part No.:
- SN74F253D
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74F253D.pdf
- Description:
- IC MULTIPLEXER 2 X 4:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:575
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Product details
Overview
SN74F253D from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer with independent 3-state outputs, operating at 4.5–5.5 V supply, 0°C to 70°C temperature range, and propagation delays as low as 1.7 ns (tPHL on data inputs), used in bus-organized digital systems for parallel-to-serial conversion and signal routing.
For engineers reviewing the SN74F253D datasheet, SN74F253D pinout, SN74F253D application, or SN74F253D equivalent, this page delivers verified functional identity, validated SOIC-16 pin mapping, confirmed switching and DC electrical specs, real-world multiplexing use cases, and two technically documented alternative parts with precise differentiation.
Technical Context
The SN74F253D implements two independent 4:1 multiplexer sections sharing common select lines A and B, each with dedicated active-low strobe (G) enabling 3-state output control. Each section drives one output (1Y or 2Y) from four data inputs (1C0–1C3 or 2C0–2C3).
It uses TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V), delivers ±24 mA output drive capability, and supports high-speed bus interfacing via fast enable/disable timing (tPZL/tPHZ ≤ 7 ns). Logic operation follows positive-logic truth table with high-impedance output when strobe is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL logic rails and noise margin stability |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial and computing applications |
| Propagation Delay (tPHL) | 1.7 ns (min) to 10 ns (max) - enables sub-100 MHz multiplexing clock rates in synchronous designs |
| Output Drive (IOL) | 24 mA (max) - sufficient to directly drive multiple TTL inputs or short PCB traces without buffering |
| 3-State Leakage (IOZL) | −50 µA - guarantees minimal bus contention current when outputs are disabled |
| Input Clamp Current | −18 mA - defines safe negative transient handling capability at inputs |
| Power Supply Current (ICCL) | 16 mA to 23 mA - reflects worst-case dynamic consumption during full switching activity |
Pinout & Package
SN74F253D is housed in a 16-pin SOIC (Small-Outline Integrated Circuit) package, 3.9 mm body width, 1.27 mm pitch, RoHS-compliant NIPDAU lead finish, MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G | Section 1 output enable (active low) | Controls 1Y high-impedance state independently of Section 2; ties to system bus grant logic |
| 2G | Section 2 output enable (active low) | Enables/disables 2Y separately; allows time-multiplexed access to shared bus lines |
| A, B | Common address select inputs | Binary-encoded selection of C0–C3 for both sections; routed once for dual-channel sync |
| 1C0–1C3 | Section 1 data inputs | Four independent logic sources fed to 1Y under control of A/B and 1G |
| 2C0–2C3 | Section 2 data inputs | Second set of four inputs routed to 2Y; supports mirrored or independent channel paths |
| 1Y, 2Y | 3-state multiplexed outputs | Low-impedance logic-level outputs or high-Z bus release; drive single-ended TTL loads |
| VCC, GND | Power and ground | Decoupling required per TI layout guidelines due to F-series fast edge rates |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Reduces component count in systems requiring two synchronized data routing paths (e.g., dual ADC/DAC interfaces) |
| Individual 3-state output control | Eliminates need for external bus transceivers when interfacing with shared data buses |
| Shared select lines A/B | Simplifies address decoding logic and reduces FPGA/CPLD pin usage in multi-channel controllers |
| Fast enable/disable timing (tPHZ ≤ 6 ns) | Supports glitch-free bus arbitration in real-time control loops with tight timing budgets |
| TTL-compatible input thresholds | Ensures interoperability with legacy 74LS/74F logic families without level-shifting circuitry |
Applications
| Data Acquisition Systems | Digital Test Equipment |
|---|---|
|
Use Scenario: Multiplexing analog-to-digital converter (ADC) channel outputs onto a shared microcontroller data bus. IC Role / Device Role: Dual 4:1 selector routes four sensor inputs per section to two independent ADC result registers. Use Value: Enables 8-channel sampling with single 8-bit data bus, reducing PCB trace count and MCU pin utilization by 50% versus discrete muxes. |
Use Scenario: Routing stimulus signals from pattern generator outputs to device-under-test (DUT) pins. IC Role / Device Role: Configurable signal path selector controlled by test controller address lines. Use Value: Allows programmable test vector sequencing without hardware reconfiguration; tPHL < 10 ns supports >50 MHz test clock rates. |
| Industrial PLC I/O Modules | Legacy Computer Backplanes |
|
Use Scenario: Consolidating status signals from multiple field sensors into a central diagnostics bus. IC Role / Device Role: Bus interface multiplexer with independent strobes for fault-isolated channel reporting. Use Value: Per-section 3-state control prevents bus contention during hot-swap or fault recovery sequences. |
Use Scenario: Interfacing expansion card peripherals (e.g., floppy controller, UART) to ISA bus data lines. IC Role / Device Role: Address-decoded data path switch enabling legacy peripheral arbitration. Use Value: Matches 74F timing spec requirements for ISA bus cycle timing; VIL/VIL margins ensure robust noise immunity in noisy backplane environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS253N | Slower propagation (tPHL up to 22 ns), lower drive (IOL = 8 mA), wider VCC tolerance (4.75–5.25 V only) | Lower power, higher noise margin; unsuitable for >25 MHz bus timing | Choose for cost-sensitive, low-speed industrial controls where F-series speed is unnecessary |
| SN74HC153DR | CMOS process: rail-to-rail VIH/VIL, 2–6 V VCC range, higher input impedance, slower tPHL (21 ns typ) | Compatible with mixed-voltage systems (3.3 V/5 V), but requires level-aware design for TTL bus interfacing | Prefer for battery-powered or low-power embedded systems needing wide supply flexibility over speed |
Compared with SN74LS253N and SN74HC153DR, the SN74F253D delivers superior speed and TTL drive strength at the expense of higher ICC and narrower voltage tolerance-making it optimal for legacy 5-V high-throughput digital systems where timing closure is critical.
Availability
SN74F253D is available at Aetrix Electronics and suitable for industrial control panels, legacy computer repair, and test equipment refurbishment requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74F253D 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The SN74F253D belongs to TI's 74F family of fast TTL logic devices, engineered for high-speed digital systems requiring predictable propagation delay, robust noise immunity, and direct compatibility with legacy 5-V logic architectures.
FAQ
What is the function of the 1G and 2G pins on the SN74F253D?
The 1G and 2G pins are independent active-low output-enable inputs for each of the two 4:1 multiplexer sections. When 1G is high, output 1Y enters high-impedance (3-state) mode regardless of select or data inputs; same applies to 2G and 2Y. This allows SN74F253D to share a common bus line between sections without external gating logic, supporting time-division multiplexing in bus-oriented systems.
Does the SN74F253D support 3.3-V logic interfaces?
No, the SN74F253D is a 5-V-only TTL device with specified VCC range of 4.5 V to 5.5 V and input thresholds optimized for 5-V operation (VIH = 2 V, VIL = 0.8 V). Driving its inputs from 3.3-V logic may result in marginal or non-functional high-level recognition; level translation is required for reliable interoperation with 3.3-V systems.
What is the maximum output sink current rating for the SN74F253D?
The SN74F253D is rated for a maximum low-level output current (IOL) of 24 mA per output (1Y or 2Y) under recommended operating conditions. This value is specified at VCC = 4.5 V and ensures reliable TTL fanout (up to 10 LS-TTL loads) without exceeding VOL limits (≤ 0.5 V).
Can the SN74F253D replace the SN74F153 in an existing design?
No-the SN74F253D is not a drop-in replacement for the SN74F153. While both are dual 4:1 multiplexers, the SN74F153 lacks individual 3-state outputs (it has only one common output enable), and its pinout differs significantly (e.g., no separate 1G/2G pins). The SN74F253D provides enhanced bus interface capability but requires PCB layout revision.
Is the SN74F253D still in active production?
The base part SN74F253D is marked "Obsolete" by Texas Instruments; however, actively stocked and supported equivalents include SN74F253DRG4 (SOIC-16, tape-and-reel, RoHS-compliant, MSL-1) and SN74F253N (PDIP-16, tube). Aetrix Electronics maintains inventory and lifecycle support for all active variants of the SN74F253D family.
SN74F253D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 3mA, 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-SOIC
SN74F253D FAQ
1.How can I place an order for SN74F253D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F253D 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 SN74F253D reliable?
The price and inventory of SN74F253D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F253D is usually 5 days.
3.What payment methods are accepted for SN74F253D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F253D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F253D?
SN74F253D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F253D 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 SN74F253D?
For technical support, including SN74F253D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F253D requirements.
6.How does Aetrix verify that SN74F253D is sourced from the original manufacturer or authorized distributors?
All SN74F253D 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 SN74F253D meets industry standards.
7.What is the process for return or replacement of SN74F253D?
All SN74F253D units undergo pre-shipment inspection (PSI). If there is an issue with SN74F253D, 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 SN74F253D part is unused and in its original packaging.
Return procedure for SN74F253D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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