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Texas Instruments SN74HC253D
- Part No.:
- SN74HC253D
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HC253D.pdf
- Description:
- IC MULTIPLEXER 2 X 4:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
SN74HC253D from Texas Instruments is a dual 4-line to 1-line data selector/multiplexer with 3-state outputs, designed for digital signal routing in bus-organized systems. It operates across 2 V–6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 9 ns (VCC = 4.5 V, CL = 50 pF), and supports parallel-to-serial conversion in industrial control logic.
For engineers reviewing the SN74HC253D datasheet, SN74HC253D pinout, SN74HC253D application, or SN74HC253D equivalent, this page provides verified functional identity, SOIC-16 package mapping, confirmed 3-state enable timing (ten = 25 ns max at 4.5 V), real-world bus interface use cases, and two validated alternative parts with documented functional and application differences.
Technical Context
The SN74HC253D integrates two independent 4:1 multiplexers sharing common select inputs (A, B) and individual 3-state output-enable (OE) controls. Each section decodes binary inputs to route one of four data lines (C0–C3) to its Y output, with full CMOS-level compatibility and rail-to-rail output swing.
Its 3-state outputs support bidirectional bus driving: when OE is high, Y enters high-impedance state; when OE is low, Y actively drives logic high or low. Input thresholds are defined per VCC (e.g., VIH = 3.15 V at VCC = 4.5 V), and maximum input transition rate is specified (500 ns at 4.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - Enables direct interface with 3.3 V and 5 V logic families without level shifters. |
| Propagation Delay (tpd) | 32 ns max at VCC = 6 V, CL = 50 pF - Supports reliable operation up to ~15 MHz data switching in combinational paths. |
| Output Drive Strength | ±6 mA at VCC = 5 V - Sufficient to drive 15 LSTTL loads or terminate short PCB traces without external buffers. |
| Quiescent Current (ICC) | 80 μA max - Enables low-static-power operation in battery-backed or energy-sensitive control subsystems. |
| Enable/Disable Time (ten/tdis) | 25 ns / 31 ns max at VCC = 6 V - Ensures clean bus arbitration with minimal contention window during output state transitions. |
| Input Leakage Current | ±1 μA max - Prevents unintended logic state shifts on unused inputs when tied to VCC/GND. |
| Power Dissipation Capacitance | 45 pF per multiplexer - Used with operating frequency to calculate dynamic power: P = Cpd × V² × f. |
Pinout & Package
SN74HC253D is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with nominal body dimensions of 9.90 mm × 3.90 mm and 1.27 mm lead pitch. The package is RoHS-compliant, moisture sensitivity level 1, and rated for operation from –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 (C0–C3) | Data Inputs, Section 1 | Four independent logic inputs selected by A/B for first multiplexer output Y1. |
| 5 (B) | Binary Select Input | Shared least-significant select bit for both multiplexers; determines lower bit of 2-bit address. |
| 6 (A) | Binary Select Input | Shared most-significant select bit for both multiplexers; determines upper bit of 2-bit address. |
| 7 (GND) | Ground Reference | Primary return path for all internal logic and output current; must be low-impedance. |
| 8 (Y1) | 3-State Output, Section 1 | Active-low enabled output for first multiplexer; high-impedance when OE1 = HIGH. |
| 9 (OE1) | Output Enable, Section 1 | Active-low control: drives Y1 to high-Z when HIGH; enables drive when LOW. |
| 10 (Y2) | 3-State Output, Section 2 | Active-low enabled output for second multiplexer; high-impedance when OE2 = HIGH. |
| 11 (OE2) | Output Enable, Section 2 | Independent active-low control for Y2; allows asynchronous bus gating of second channel. |
| 12, 13, 14, 15 (C0–C3) | Data Inputs, Section 2 | Second set of four data inputs, decoded identically to first section using same A/B. |
| 16 (VCC) | Positive Supply | Single 2–6 V supply for entire device; requires local 0.1 μF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexing | Enables simultaneous routing of two separate 4-input data streams without cross-talk or shared timing constraints. |
| Individual 3-state output enables | Permits time-multiplexed bus sharing between Y1 and Y2 on a single trace, reducing PCB layer count. |
| Wide 2–6 V supply range | Eliminates need for dedicated voltage regulators in mixed-supply systems (e.g., 3.3 V MCU + 5 V peripherals). |
| Low ICC (80 μA max) | Reduces system standby power in always-on monitoring circuits such as PLC I/O modules. |
| CMOS-compatible input thresholds | Ensures robust noise margin (>1.3 V at 5 V) and interoperability with HC, HCT, AHC, and modern microcontroller GPIOs. |
Applications
| Industrial PLC I/O Expansion | Test Equipment Signal Routing |
|---|---|
Use Scenario: Adding configurable analog/digital input channels to a programmable logic controller rack via shared backplane bus. IC Role / Device Role / Timing Role: SN74HC253D selects one of four sensor inputs per module under CPU address control, feeding digitized data to ADC interface. Use Value: Reduces component count versus discrete gate solutions while maintaining deterministic 32 ns selection latency for cycle-accurate sampling. | Use Scenario: Automated test fixture that routes stimulus signals from multiple sources to DUT pins based on test step configuration. IC Role / Device Role / Timing Role: SN74HC253D acts as a reconfigurable signal switch matrix, controlled by FPGA GPIOs to assign waveform generators to specific pins. Use Value: Enables sub-50 ns channel switching without relay wear-out or FPGA pin exhaustion, supporting high-throughput parametric testing. |
| Embedded System Bus Arbitration | Digital Audio Data Multiplexing |
Use Scenario: Managing shared SPI or I²C bus access among multiple peripheral ICs in an automotive body controller. IC Role / Device Role / Timing Role: SN74HC253D gates peripheral responses onto a common bus line using hardware-controlled OE signals synchronized to master clock. Use Value: Prevents bus contention during concurrent peripheral activity, eliminating software arbitration overhead and ensuring glitch-free communication. | Use Scenario: Consolidating stereo audio sample streams from four ADCs into a single serial data lane for DSP processing in consumer audio gear. IC Role / Device Role / Timing Role: SN74HC253D performs time-division multiplexing of left/right channel pairs under clock-synchronized A/B selects. Use Value: Achieves 4:1 data compression without FIFO buffering, lowering memory bandwidth requirements and simplifying clock domain crossing. |
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 |
|---|---|---|---|
| SN74HCT253D | TTL-compatible input thresholds (VIH = 2 V min at VCC = 4.5 V); identical pinout and AC specs. | Better suited for mixed 5 V TTL/CMOS systems where legacy logic drives inputs directly. | Select SN74HCT253D only if interfacing with 74LS or other TTL-family outputs without level translation. |
| 74LCX253M | Lower VCC range (2.0–3.6 V), higher speed (tpd = 5.5 ns typ at 3.3 V), and 5 V tolerant inputs. | Optimized for 3.3 V core logic with 5 V peripheral interfacing; not rated for 6 V operation. | Choose 74LCX253M for portable or low-voltage embedded designs requiring faster switching and voltage flexibility. |
Compared with SN74HC253D, SN74HCT253D offers guaranteed TTL input compatibility at 5 V but no advantage in pure CMOS systems, while 74LCX253M delivers superior speed and 3.3 V efficiency at the cost of reduced maximum supply voltage and different thermal characteristics.
Availability
SN74HC253D is available at Aetrix Electronics and suitable for industrial automation, test equipment design, and embedded bus management requiring stable component supply across long production lifecycles.
Supply support for SN74HC253D 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 specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in industrial, automotive, and communications markets.
The SN74HC253D belongs to TI's 74HC logic family, engineered for high noise immunity, low power consumption, and seamless integration into mixed-voltage digital systems requiring reliable signal selection and bus interfacing.
FAQ
What is the maximum operating temperature range for the SN74HC253D?
The SN74HC253D is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in factory-floor controllers, outdoor instrumentation, and commercial-grade embedded systems without derating. Thermal resistance (RθJA) is 73°C/W in the SOIC package, allowing safe operation at full load within this envelope when board layout includes adequate copper pour.
Does the SN74HC253D support 3.3 V logic levels?
Yes, the SN74HC253D fully supports 3.3 V operation: its recommended VCC range includes 3.3 V, input thresholds scale proportionally (VIH = 2.31 V min at 3.3 V), and output drive meets 3.3 V CMOS requirements (VOH ≥ 3.15 V, VOL ≤ 0.15 V). It interfaces directly with 3.3 V microcontrollers and FPGAs without level-shifting circuitry.
How does the 3-state output control work on the SN74HC253D?
The SN74HC253D features two independent active-low output-enable inputs (OE1, OE2). When OE1 is HIGH, Y1 enters high-impedance state regardless of select or data inputs; when OE1 is LOW, Y1 actively drives the selected Cx input. Identical behavior applies to Y2/OE2. This allows asynchronous bus release and prevents contention in multi-driver environments.
Can unused inputs on the SN74HC253D be left floating?
No - all unused inputs on the SN74HC253D must be tied to VCC or GND. Floating CMOS inputs cause increased ICC, unpredictable logic states, and potential oscillation due to intermediate voltage biasing. TI explicitly recommends hard-wiring unused A, B, Cx, or OE pins to valid logic levels per the "Implications of Slow or Floating CMOS Inputs" application report (SCBA004).
What is the typical power dissipation of the SN74HC253D at 5 V and 1 MHz?
At VCC = 5 V and f = 1 MHz with all inputs switching, SN74HC253D power dissipation is approximately 2.3 mW per multiplexer: P = Cpd × V² × f = 45 pF × (5 V)² × 1 MHz = 1.125 mW static + dynamic contribution. Total device dissipation remains under 5 mW, well within SOIC package thermal limits even in sealed enclosures.
SN74HC253D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74HC253D FAQ
1.How can I place an order for SN74HC253D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC253D 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 SN74HC253D reliable?
The price and inventory of SN74HC253D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC253D is usually 5 days.
3.What payment methods are accepted for SN74HC253D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC253D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC253D?
SN74HC253D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC253D 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 SN74HC253D?
For technical support, including SN74HC253D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC253D requirements.
6.How does Aetrix verify that SN74HC253D is sourced from the original manufacturer or authorized distributors?
All SN74HC253D 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 SN74HC253D meets industry standards.
7.What is the process for return or replacement of SN74HC253D?
All SN74HC253D units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC253D, 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 SN74HC253D part is unused and in its original packaging.
Return procedure for SN74HC253D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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