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Texas Instruments CD74HCT253EG4
- Part No.:
- CD74HCT253EG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT253EG4.pdf
- Description:
- IC MULTIPLEXER 2 X 4:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,085
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Product details
Overview
CD74HCT253EG4 from Texas Instruments is a dual 4-to-1 line selector/multiplexer with three-state outputs, designed for digital signal routing in bus-oriented systems. It features common select inputs (S0, S1), independent output-enable controls (1OE, 2OE), operates from 4.5 V to 5.5 V, supports -55°C to +125°C temperature range, and delivers 38 ns typical propagation delay (data-to-output, VCC = 4.5 V, CL = 50 pF). It is used in address/data multiplexing, test equipment signal switching, and programmable logic interface circuits.
For engineers reviewing the CD74HCT253EG4 datasheet, CD74HCT253EG4 pinout, CD74HCT253EG4 application, or CD74HCT253EG4 equivalent, key selection criteria include LSTTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), three-state bus-driving capability, wide industrial temperature support, and PDIP/SOIC package compatibility with legacy 74-series logic layouts.
Technical Context
The CD74HCT253EG4 implements two independent 4-input multiplexers sharing S0 and S1 select lines, each with dedicated active-low output-enable (1OE, 2OE) controlling high-impedance state entry. Its HCT logic family ensures direct compatibility with TTL-level inputs while maintaining CMOS power efficiency and noise immunity (NIL/NIH = 30% of VCC at 5 V).
Propagation delays are tightly balanced between select-to-output (40 ns max) and data-to-output (38 ns max) paths under 4.5 V/50 pF conditions, and enable/disable timing (tPZH/tPLZ = 30 ns max) supports clean bus arbitration. Input loading is standardized per TI's unit load definition: 1.0 unit for S0/S1/1OE/2OE, 0.4 unit for data inputs (1I0–1I3, 2I0–2I3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS power profile, 4.5–5.5 V operation |
| Function | Dual 4-to-1 multiplexer with three-state outputs and shared S0/S1 select lines |
| Propagation Delay | 38 ns max (data-to-output, VCC = 4.5 V, CL = 50 pF) - enables <26 MHz sustained switching in synchronous buses |
| Input Voltage Thresholds | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - guarantees interoperability with standard LSTTL outputs |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, industrial control, and under-hood automotive subsystems |
| Output Drive | ±25 mA per output (TTL loads), 15 LSTTL fanout - drives terminated transmission lines and legacy logic loads |
| Three-State Leakage | ±5 µA max (VO = VCC/GND, TA = -55°C to +125°C) - ensures low standby current in high-density bus architectures |
Pinout & Package
CD74HCT253EG4 is supplied in a 16-lead SOIC (Small Outline Integrated Circuit) package, 3.9 mm body width, JEDEC MS-012AC compliant, RoHS-compliant with NiPdAu lead finish, MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low output-enable for first multiplexer section - asserts high-impedance on Pin 15 (1Y) when HIGH |
| 2–3 | 1I0, 1I1 | Data inputs for first multiplexer - selected by S0/S1 to drive 1Y (Pin 15) |
| 4–5 | 1I2, 1I3 | Data inputs for first multiplexer - complete 4-input set with Pins 2–3 |
| 6 | GND | Ground reference for all internal logic and output drivers |
| 7 | 1Y | Three-state output for first multiplexer - high-impedance when 1OE = HIGH or S0/S1 invalid |
| 8 | VCC | Positive supply (4.5–5.5 V) - powers both sections and enables CMOS-level output swing |
| 9–10 | S0, S1 | Common binary select inputs - determine which of four inputs (1I0–1I3 or 2I0–2I3) routes to respective Y output |
| 11–12 | 2I0, 2I1 | Data inputs for second multiplexer - selected by same S0/S1 to drive 2Y (Pin 2) |
| 13–14 | 2I2, 2I3 | Data inputs for second multiplexer - complete 4-input set with Pins 11–12 |
| 15 | 2Y | Three-state output for second multiplexer - independently controlled by 2OE (Pin 16) |
| 16 | 2OE | Active-low output-enable for second multiplexer - asserts high-impedance on Pin 15 (2Y) when HIGH |
Key Features
| Feature | Design Value |
|---|---|
| Common Select Inputs (S0, S1) | Reduces PCB routing complexity by eliminating duplicate select lines for dual-channel operation |
| Separate Output-Enable Inputs (1OE, 2OE) | Enables independent bus arbitration per channel - critical for time-multiplexed diagnostics or dual-CPU memory access |
| Three-State Outputs | Allows direct connection to shared data/address buses without external isolation logic or pull-ups |
| LSTTL Input Compatibility | Eliminates level-shifting circuitry when interfacing with legacy 74LS/74ALS families |
| Wide Temperature Range (-55°C to +125°C) | Supports deployment in uncontrolled environments including engine control units and avionics cabinets |
Applications
| Industrial PLC I/O Multiplexing | Automotive Diagnostic Interface |
|---|---|
Use Scenario: Consolidating multiple sensor analog-to-digital converter outputs onto a single microcontroller ADC input channel using timed select sequencing. IC Role / Device Role / Timing Role: Dual 4-to-1 multiplexer providing time-sliced analog signal routing with synchronized enable control per channel. Use Value: Reduces microcontroller pin count and eliminates need for discrete analog switches or additional ADC peripherals in space-constrained control modules. |
Use Scenario: Switching between multiple CAN transceiver diagnostic lines and a single ECU debug port during vehicle service mode. IC Role / Device Role / Timing Role: Bus-isolated signal selector enabling safe, non-intrusive access to individual network nodes without disrupting active communication. Use Value: Enables field-service technicians to isolate and validate specific ECUs without rewiring harnesses or powering down entire networks. |
| Test Equipment Signal Routing | Legacy System Bus Expansion |
Use Scenario: Configurable signal path selection in automated test fixtures where DUT signals must be routed to different measurement instruments based on test step. IC Role / Device Role / Timing Role: High-reliability digital switch implementing deterministic, glitch-free signal routing under firmware control. Use Value: Achieves sub-50 ns path switching with guaranteed high-impedance isolation - prevents crosstalk and measurement contamination across instrument channels. |
Use Scenario: Extending 8-bit data bus width in retro-computing or industrial controller upgrades using existing 74-series footprint compatibility. IC Role / Device Role / Timing Role: Pin-compatible multiplexer augmenting address/data path flexibility without requiring PCB redesign. Use Value: Maintains backward compatibility with 74LS253-based designs while delivering lower power consumption and improved noise margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-to-1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT253D | Same logic function, identical pinout, identical HCT electrical specs; manufactured by TI with newer SOIC packaging and updated MSL rating (Level-1-260C-UNLIM vs. G4's legacy qualification) | No functional difference; suitable for new designs requiring latest process and traceability | Select SN74HCT253D for new production where long-term supply continuity and modern packaging compliance are prioritized. |
| 74VHC253M | Higher VCC range (2–5.5 V), faster propagation (20 ns typ), but LVTTL-compatible inputs (VIL = 0.8 V, VIH = 2.0 V same); not LSTTL-input compatible at 5 V | Requires verification of source driver compatibility; unsuitable where legacy 74LS outputs directly drive inputs | Choose 74VHC253M only if system uses mixed-voltage logic or requires sub-25 ns timing, and input sources meet VHC thresholds. |
Compared with CD74HCT253EG4, SN74HCT253D offers identical functionality with enhanced manufacturability and lifecycle support, while 74VHC253M trades LSTTL compatibility for higher speed and wider voltage range - making CD74HCT253EG4 the optimal choice for drop-in replacement in legacy 74-series systems requiring guaranteed TTL-level interoperability.
Availability
CD74HCT253EG4 is available at Aetrix Electronics and suitable for industrial automation, automotive diagnostics, and test equipment applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74HCT253EG4 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 90 years of innovation in industrial, automotive, and aerospace electronics.
The CD74HCT253EG4 belongs to TI's legacy high-speed CMOS logic family, engineered specifically for pin- and function-compatible upgrades of 74LS/74ALS devices while delivering superior power efficiency and thermal robustness.
FAQ
What is the supply voltage range for CD74HCT253EG4?
The CD74HCT253EG4 operates strictly within 4.5 V to 5.5 V. Unlike HC variants, it does not support 2–6 V operation. Operation outside this window risks undefined logic states or damage. The device draws quiescent current of ≤160 µA across the full temperature range at VCC = 5.5 V, confirming its suitability for power-sensitive industrial control modules.
Does CD74HCT253EG4 support LSTTL input compatibility?
Yes, CD74HCT253EG4 guarantees LSTTL input compatibility: VIH ≥ 2.0 V (minimum) and VIL ≤ 0.8 V (maximum) at VCC = 4.5–5.5 V. This allows direct connection to 74LS00, 74LS32, and similar outputs without level shifters - a key requirement verified in TI's HCT specification tables and confirmed in the SCHS170B datasheet.
What is the maximum propagation delay for CD74HCT253EG4?
The maximum propagation delay for CD74HCT253EG4 is 60 ns (select-to-output) and 57 ns (data-to-output), measured at VCC = 4.5 V, CL = 50 pF, and TA = -55°C to +125°C. These values are specified in the "Switching Specifications" table of the official datasheet and define worst-case timing margins for synchronous bus arbitration design.
Is CD74HCT253EG4 pin-compatible with CD74HC253E?
Yes, CD74HCT253EG4 is pin-compatible with CD74HC253E in the same SOIC-16 package, sharing identical pin assignments and physical dimensions. However, they differ electrically: CD74HC253E supports 2–6 V operation and CMOS input thresholds, whereas CD74HCT253EG4 requires 4.5–5.5 V and accepts TTL-level inputs - substitution requires voltage and driver compatibility validation.
What package type is used for CD74HCT253EG4?
CD74HCT253EG4 uses a 16-lead SOIC (Small Outline Integrated Circuit) package, designated as "D" drawing by Texas Instruments, with 3.9 mm body width, 1.27 mm lead pitch, and RoHS-compliant NiPdAu termination. This matches the industry-standard 74-series SOIC footprint and is documented in TI's PACKAGE OPTION ADDENDUM dated 6-Feb-2020.
CD74HCT253EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Type:
- Multiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74HCT253EG4 FAQ
1.How can I place an order for CD74HCT253EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT253EG4 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 CD74HCT253EG4 reliable?
The price and inventory of CD74HCT253EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT253EG4 is usually 5 days.
3.What payment methods are accepted for CD74HCT253EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT253EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT253EG4?
CD74HCT253EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT253EG4 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 CD74HCT253EG4?
For technical support, including CD74HCT253EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT253EG4 requirements.
6.How does Aetrix verify that CD74HCT253EG4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT253EG4 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 CD74HCT253EG4 meets industry standards.
7.What is the process for return or replacement of CD74HCT253EG4?
All CD74HCT253EG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT253EG4, 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 CD74HCT253EG4 part is unused and in its original packaging.
Return procedure for CD74HCT253EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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