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Texas Instruments CD74HCT151E
- Part No.:
- CD74HCT151E
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT151E.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,878
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Product details
Overview
CD74HCT151E from Texas Instruments is a high-speed CMOS 8-input digital multiplexer with active-low enable (G), three binary select inputs (A, B, C), and complementary outputs (Y non-inverting, W inverting). It operates from 4.5 V to 5.5 V, supports -55°C to +125°C industrial/military temperature range, and delivers propagation delays as low as 12 ns (enable-to-Y, 4.5 V, 25°C). It is used in data routing, address decoding, and signal selection in embedded control systems.
For engineers reviewing the CD74HCT151E datasheet, CD74HCT151E pinout, CD74HCT151E application, or CD74HCT151E equivalent, key selection criteria include TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), dual-output polarity support, guaranteed operation across extended temperature, and PDIP-16 packaging for through-hole prototyping and legacy board compatibility.
Technical Context
The CD74HCT151E implements a single 8:1 multiplexer function using standard CMOS process technology with TTL-level input stage design. Its internal logic decodes A/B/C select lines to route one of eight data inputs (D0–D7) to both Y (true) and W (inverted) outputs, while G enables or disables the output stage.
All inputs are buffered, ensuring consistent drive strength and noise immunity (NIL/NIH = 30% of VCC at 5 V). The device exhibits balanced propagation delay between select/data paths and outputs, with transition times under 22 ns (CL = 50 pF), enabling reliable timing in synchronous digital systems operating up to ~20 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures direct drop-in replacement for 5 V LSTTL systems without level shifting. |
| Input Logic Compatibility | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - guarantees robust interfacing with standard TTL outputs. |
| Propagation Delay (G→Y) | 12 ns (typ, 25°C, 4.5 V) - supports clock rates up to ~20 MHz in critical path routing. |
| Output Drive | ±4 mA (IOH/IOL) - sufficient to drive 10 LSTTL loads directly, eliminating need for buffer stages. |
| Operating Temperature | -55°C to +125°C - qualified for military, aerospace, and harsh-environment industrial applications. |
| Power Dissipation Cap | CPD = 58 pF - enables accurate dynamic power estimation (PD = VCC² × f × (CPD + CL)). |
Pinout & Package
CD74HCT151E is housed in a 16-pin plastic dual in-line package (PDIP-N), with 19.31 mm × 6.35 mm body size and through-hole mounting. Pin 1 is located at the left end of the top row (quadrant Q1), marked by a notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G) | Active-low enable | Output disabled (high-impedance Y/W) when logic HIGH; required LOW to activate multiplexing. |
| 2–4 (D0–D2) | Data inputs | First three of eight parallel data sources selected based on A/B/C state. |
| 5 (C) | Select input (MSB) | Most significant bit of 3-bit binary address controlling channel selection (CBA). |
| 6 (B) | Select input | Mid-significance bit of channel address; combined with A and C to decode D0–D7. |
| 7 (A) | Select input (LSB) | Least significant bit; full 3-bit code determines which data input appears at Y/W. |
| 8 (GND) | Ground reference | Primary return path for all internal logic and I/O; must be low-impedance connection. |
| 9 (D3) | Data input | Fourth data channel; routed to Y/W when CBA = 011. |
| 10 (D4) | Data input | Fifth data channel; selected when CBA = 100. |
| 11 (D5) | Data input | Sixth data channel; activated at CBA = 101. |
| 12 (D6) | Data input | Seventh data channel; enabled at CBA = 110. |
| 13 (D7) | Data input | Eighth and final data source; selected when CBA = 111. |
| 14 (W) | Inverted output | Complementary logic level of Y; eliminates need for external inverter in differential routing. |
| 15 (Y) | Non-inverting output | Main multiplexed output; reflects selected Dn value when G = LOW. |
| 16 (VCC) | Positive supply | 5 V ±0.5 V power rail; requires local 0.1 μF bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary outputs (Y/W) | Provides true and inverted signals simultaneously-reduces component count in bus arbitration and parity generation. |
| Buffered inputs and outputs | Ensures stable logic thresholds and consistent fanout capability (10 LSTTL loads) across voltage/temperature. |
| TTL-compatible input thresholds | Eliminates external level-shifting circuitry when interfacing with legacy 5 V TTL logic families. |
| Extended temperature range | Validated operation from -55°C to +125°C supports deployment in avionics, downhole tools, and engine control units. |
| Low dynamic power consumption | CPD = 58 pF enables predictable power modeling in high-density logic designs without thermal derating. |
Applications
| Industrial PLC I/O Multiplexing | Automotive Sensor Signal Routing |
|---|---|
Use Scenario: Consolidating 8 analog sensor inputs (e.g., temperature, pressure) into a single ADC channel via digital control. IC Role / Device Role / Timing Role: Digital selector routing one of eight conditioned sensor signals to a shared ADC front-end. Use Value: Reduces PCB trace count and microcontroller GPIO usage while maintaining deterministic sample timing via synchronized A/B/C control. | Use Scenario: Selecting among multiple CAN transceiver status flags or diagnostic lines in a vehicle ECU. IC Role / Device Role / Timing Role: Level-sensitive multiplexer enabling real-time visibility into discrete subsystem health signals. Use Value: Enables compact fault-monitoring architecture without adding propagation delay beyond 17 ns (worst-case select-to-Y). |
| Legacy System Address Decoding | Military Data Acquisition Backplane |
Use Scenario: Translating 3-bit address bus outputs into chip-select lines for eight peripheral memory or I/O devices. IC Role / Device Role / Timing Role: Static decoder implementing 3-to-8 enable logic with active-low output polarity matching legacy peripherals. Use Value: Direct compatibility with 5 V TTL address buses and guaranteed setup/hold timing margins due to balanced tpd/tt characteristics. | Use Scenario: Routing telemetry data streams from eight remote field sensors into a central processing module in ruggedized defense hardware. IC Role / Device Role / Timing Role: Radiation-tolerant (via CD54HCT151 heritage) signal switch operating in wide-temperature environments. Use Value: Meets MIL-PRF-38535 requirements for extended temperature operation and long-term reliability without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT151N | Same logic function, pinout, and electrical specs; manufactured by TI with identical PDIP-16 package and marking. | No functional or mechanical difference; SN74HCT151N is TI's alternate orderable part number for same device. | Select SN74HCT151N if preferred TI prefix convention is required for BOM alignment or procurement policy. |
| MC74HCT151PG | Functionally identical 8:1 mux, but from ON Semiconductor; uses same PDIP-16 footprint and TTL-compatible inputs. | Identical operating range (-55°C to +125°C) and switching performance; minor differences in ICC max (160 μA vs. 160 μA) and CPD (58 pF vs. 59 pF). | Choose MC74HCT151PG for dual-sourcing strategy or where ON Semi's qualification documentation is mandated. |
Compared with SN74HCT151N and MC74HCT151PG, the CD74HCT151E offers identical multiplexing functionality and pin compatibility, but differs in part numbering convention and manufacturer-specific test flow-making it suitable for designs requiring TI's CDxx-series qualification pedigree and long-term military-grade availability.
Availability
CD74HCT151E is available at Aetrix Electronics and suitable for industrial control systems, automotive diagnostics modules, and military data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT151E 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 high-reliability components.
The CD74HCT151E belongs to TI's CD74HCT logic family, designed specifically for seamless integration into 5 V TTL-based systems requiring extended temperature operation, low power, and high noise immunity.
FAQ
What is the maximum clock frequency supported by CD74HCT151E?
The CD74HCT151E does not operate on a clock signal-it is a combinational logic device. Its speed is defined by propagation delay: worst-case enable-to-Y delay is 44 ns at -55°C to +125°C (4.5 V). This supports reliable operation in systems with signal transitions up to ~10–15 MHz, assuming adequate setup/hold margins for control inputs A/B/C/G. The CD74HCT151E itself imposes no periodic timing constraint.
Can CD74HCT151E interface directly with 3.3 V microcontrollers?
No-CD74HCT151E requires 4.5 V to 5.5 V supply and has TTL-compatible inputs (VIH ≥ 2.0 V min), but its outputs swing rail-to-rail (0 V / VCC). Driving it from a 3.3 V MCU violates VIH minimum (2.0 V) only marginally, but output levels will be 5 V, risking damage to 3.3 V inputs. A level-shifter or buffer is required for safe bidirectional interfacing. The CD74HCT151E is intended for 5 V system domains.
Does CD74HCT151E have ESD protection diodes on its inputs?
Yes-the CD74HCT151E includes internal ESD protection diodes on all inputs and outputs, rated per JEDEC JS-001. Absolute maximum ratings specify ±20 mA input diode current (VI < –0.5 V or > VCC + 0.5 V). However, TI recommends handling with standard ESD precautions, as excessive ESD events can degrade performance. The CD74HCT151E is not latch-up immune under all conditions.
Is the CD74HCT151E RoHS compliant?
Yes-CD74HCT151E is RoHS compliant, with lead finish NIPDAU (nickel/palladium/gold) and exemption status confirmed in TI's official packaging addendum. It meets EU Directive 2011/65/EU and subsequent amendments, including restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE.
What is the purpose of the complementary W output on CD74HCT151E?
The W output provides the logical inverse of the Y output-enabling simultaneous access to true and complemented data without external inverters. This is valuable in applications like parity generation, differential bus driving, or logic minimization where both polarities are needed. For example, when Y = HIGH, W = LOW, and vice versa-both updated within 22 ns (max tt) under load.
CD74HCT151E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 1 x 8:1
- 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
CD74HCT151E FAQ
1.How can I place an order for CD74HCT151E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT151E 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 CD74HCT151E reliable?
The price and inventory of CD74HCT151E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT151E is usually 5 days.
3.What payment methods are accepted for CD74HCT151E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT151E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT151E?
CD74HCT151E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT151E 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 CD74HCT151E?
For technical support, including CD74HCT151E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT151E requirements.
6.How does Aetrix verify that CD74HCT151E is sourced from the original manufacturer or authorized distributors?
All CD74HCT151E 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 CD74HCT151E meets industry standards.
7.What is the process for return or replacement of CD74HCT151E?
All CD74HCT151E units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT151E, 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 CD74HCT151E part is unused and in its original packaging.
Return procedure for CD74HCT151E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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