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Texas Instruments CD74HCT253M
- Part No.:
- CD74HCT253M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT253M.pdf
- Description:
- IC MULTIPLEXER 2 X 4:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:400
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Product details
Overview
CD74HCT253M 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 inputs (1OE, 2OE), operates from 4.5 V to 5.5 V, supports -55°C to +125°C temperature range, and delivers propagation delays as low as 38 ns (data-to-output, CL = 50 pF) at 4.5 V.
For engineers reviewing the CD74HCT253M datasheet, CD74HCT253M pinout, CD74HCT253M application, or CD74HCT253M equivalent, key selection criteria include LSTTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), high-impedance three-state outputs for bus sharing, dual-section independence, and SOIC-16 packaging for space-constrained industrial control and test equipment designs.
Technical Context
The CD74HCT253M implements two independent 4-input multiplexers sharing select lines S0 and S1, enabling simultaneous channel selection across both sections. Each section drives a single three-state output (1Y, 2Y) controlled by its dedicated enable input (1OE, 2OE), allowing selective bus connection without contention.
Its HCT logic family ensures direct compatibility with LSTTL voltage levels while maintaining CMOS power efficiency. Input leakage remains ≤ ±1 µA at VCC = 5.5 V, and three-state output leakage is ≤ ±10 µA over full temperature range, supporting reliable operation in noise-sensitive mixed-signal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS power efficiency, 4.5–5.5 V supply |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, military, and under-hood automotive use |
| Propagation Delay | 38 ns max (data-to-Y, CL = 50 pF, VCC = 4.5 V) - enables timing-critical address/data switching |
| Output Drive | ±25 mA per output - sufficient to drive 15 LSTTL loads or standard PCB traces |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - ensures robust interfacing with legacy 5 V TTL logic |
| Three-State Leakage | ±10 µA max (VO = VCC/GND, TA = -55°C to +125°C) - prevents bus leakage-induced logic errors |
| Supply Current | 160 µA max ICC (TA = -55°C to +125°C) - supports low-quiescent-power system design |
Pinout & Package
CD74HCT253M is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012 compliant, moisture sensitivity level 1 (260°C reflow compatible).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | Output Enable (1OE, 2OE) | Active-low control: HIGH forces corresponding Y output into high-impedance state |
| 2, 14 | Data Inputs (1I0–1I3, 2I0–2I3) | Four independent data sources per section; selected by S0/S1 binary code |
| 3, 4, 5, 6 | Data Inputs (1I0–1I3) | Section 1 input bank; I0 selected when S1S0 = 00, I3 when S1S0 = 11 |
| 10, 11, 12, 13 | Data Inputs (2I0–2I3) | Section 2 input bank; identical selection logic to Section 1 |
| 9, 16 | Select Inputs (S0, S1) | Common to both sections; define 4:1 routing path for each Y output |
| 7 | GND | Ground reference for all logic and output stages |
| 8, 16 | Outputs (1Y, 2Y) | Three-state outputs; driven only when respective OE is LOW |
| 16 | VCC | Positive supply rail (4.5–5.5 V); powers internal logic and output buffers |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Enables parallel signal routing (e.g., dual ADC channel selection or redundant data paths) without inter-section timing coupling |
| Common S0/S1 select lines | Reduces control wiring count and simplifies FPGA/CPLD interface by synchronizing selection across both sections |
| Separate 1OE/2OE inputs | Allows independent bus arbitration - one section can drive while the other remains tri-stated, preventing contention |
| Three-state outputs with low leakage | Supports shared-bus architectures (e.g., backplane data buses) with < ±10 µA off-state current, minimizing standby power and crosstalk |
| LSTTL-compatible input thresholds | Eliminates need for level-shifting when interfacing with legacy 5 V TTL microcontrollers, PLDs, or peripheral ICs |
Applications
| Industrial PLC I/O Multiplexing | Aerospace Sensor Data Routing |
|---|---|
Use Scenario: A programmable logic controller routes analog sensor inputs (temperature, pressure, flow) to a single ADC via time-shared sampling. IC Role / Device Role / Timing Role: CD74HCT253M acts as dual-channel analog front-end switch, selecting one of four sensor signals per ADC channel under microcontroller GPIO control. Use Value: Enables cost-effective expansion of input channels without adding ADCs; SOIC-16 footprint fits dense control board layouts. | Use Scenario: Avionics subsystem consolidates telemetry from multiple redundant inertial measurement units (IMUs) onto a shared MIL-STD-1553 data bus. IC Role / Device Role / Timing Role: CD74HCT253M serves as fault-tolerant data selector, routing primary or backup IMU outputs based on health monitor status signals. Use Value: -55°C to +125°C rating ensures reliability in extreme cabin and external mounting environments; three-state outputs prevent bus conflicts during failover. |
| Automotive ECU Diagnostic Interface | Test Equipment Signal Switching |
Use Scenario: Engine control unit provides configurable diagnostic access to multiple CAN, LIN, and analog sensor lines via a single service port. IC Role / Device Role / Timing Role: CD74HCT253M functions as a reconfigurable signal router, directing selected vehicle bus or sensor lines to the diagnostic UART or ADC. Use Value: LSTTL-compatible inputs simplify integration with existing 5 V ECU logic; wide temperature range supports under-hood deployment. | Use Scenario: Automated test equipment switches between multiple DUT (device-under-test) signal sources during functional validation. IC Role / Device Role / Timing Role: CD74HCT253M operates as a precision digital switch matrix, routing stimulus signals or measurement returns under GPIB/LXI controller command. Use Value: 38 ns propagation delay ensures sub-25 MHz switching fidelity; low output leakage (<10 µA) maintains signal integrity during high-impedance measurement phases. |
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 |
|---|---|---|---|
| SN74HCT253N | PDIP-16 package; identical electrical specs and pinout; higher thermal resistance (θJA = 67°C/W vs. 73°C/W) | Better suited for prototyping or through-hole assembly; less suitable for high-density surface-mount production | Choose SN74HCT253N when manual soldering or breadboarding is required; CD74HCT253M preferred for automated SMT lines. |
| 74ACT253SCX | Faster propagation (2.5 ns typical vs. 38 ns max); ACT family (4.5–5.5 V); higher drive (±24 mA) but higher ICC (4 µA typ vs. 160 µA max) | Targeted at high-speed logic systems where timing margin is critical; not drop-in due to different AC characteristics and layout sensitivity | Select 74ACT253SCX only when sub-10 ns timing is mandatory and board layout accommodates faster edge rates; CD74HCT253M remains optimal for general-purpose industrial switching. |
Compared with SN74HCT253N and 74ACT253SCX, the CD74HCT253M offers the best balance of industrial temperature support, SOIC-16 manufacturability, and LSTTL compatibility - making it ideal for volume production in harsh-environment embedded systems where reliability and assembly scalability outweigh marginal speed gains.
Availability
CD74HCT253M is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, aerospace telemetry routing, and automotive ECU diagnostic interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT253M 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 for industrial, automotive, and aerospace markets.
The CD74HCT253M belongs to TI's High-Speed CMOS Logic (HCT) family, engineered for seamless 5 V TTL system integration with reduced power consumption and extended temperature resilience.
FAQ
What is the supply voltage range supported by the CD74HCT253M?
The CD74HCT253M operates strictly within 4.5 V to 5.5 V. Unlike HC variants, it does not support 2 V or 6 V rails. This narrow range ensures guaranteed LSTTL input compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and stable three-state output behavior across its full -55°C to +125°C operating temperature range. Operating outside this window may cause undefined logic states or excessive ICC.
Does the CD74HCT253M support independent selection of inputs for each multiplexer section?
No - the CD74HCT253M uses common S0 and S1 select inputs for both sections. When S1S0 = 01, both 1Y and 2Y output their respective I1 inputs simultaneously. Independent selection requires two separate multiplexers or a different device such as dual 2:1 selectors. This shared-control architecture reduces control pin count but enforces synchronized routing across both sections.
What is the maximum propagation delay for the CD74HCT253M under worst-case conditions?
The maximum propagation delay for the CD74HCT253M is 60 ns (select-to-output) and 57 ns (data-to-output), specified at VCC = 4.5 V, CL = 50 pF, and TA = -55°C to +125°C. These values appear in the "-55°C TO 125°C" column of the HCT switching specifications table and represent guaranteed timing limits for production-level design margining in safety-critical applications.
Can the CD74HCT253M be used in a 3.3 V system?
No - the CD74HCT253M is not rated for 3.3 V operation. Its absolute minimum VCC is 4.5 V, and input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) assume a 5 V reference. Driving it from a 3.3 V controller risks VIH violation and unreliable switching. For 3.3 V systems, consider the CD74HC253M (2–6 V) or SN74LVC253A (1.65–3.6 V), which provide appropriate voltage-level compatibility.
How does the three-state output behavior work on the CD74HCT253M?
Each output (1Y, 2Y) enters high-impedance state when its respective enable input (1OE or 2OE) is driven HIGH. When OE is LOW, the output actively drives logic HIGH or LOW based on selected input and S0/S1 state. This allows multiple CD74HCT253M devices (or other three-state drivers) to share a common bus without contention - only the device with OE = LOW affects the bus voltage, while others present >10 MΩ impedance.
CD74HCT253M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HCT253M FAQ
1.How can I place an order for CD74HCT253M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT253M 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 CD74HCT253M reliable?
The price and inventory of CD74HCT253M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT253M is usually 5 days.
3.What payment methods are accepted for CD74HCT253M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT253M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT253M?
CD74HCT253M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT253M 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 CD74HCT253M?
For technical support, including CD74HCT253M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT253M requirements.
6.How does Aetrix verify that CD74HCT253M is sourced from the original manufacturer or authorized distributors?
All CD74HCT253M 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 CD74HCT253M meets industry standards.
7.What is the process for return or replacement of CD74HCT253M?
All CD74HCT253M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT253M, 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 CD74HCT253M part is unused and in its original packaging.
Return procedure for CD74HCT253M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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