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Texas Instruments CD74HCT158E
- Part No.:
- CD74HCT158E
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT158E.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,513
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Product details
Overview
CD74HCT158E from Texas Instruments is a quad 2-input inverting multiplexer IC used for data routing and function generation in digital logic systems. It features active-low Enable (E), common Select (S), 16-pin PDIP package, -55°C to +125°C operating temperature, and TTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V at VCC = 4.5–5.5 V).
For engineers reviewing the CD74HCT158E datasheet, CD74HCT158E pinout, CD74HCT158E application, or CD74HCT158E equivalent, key selection criteria include its inverting output behavior, guaranteed LSTTL compatibility, wide temperature range, low quiescent current (≤160 µA), and propagation delay of 28–42 ns (VCC = 4.5 V, CL = 50 pF).
Technical Context
The CD74HCT158E implements four independent 2:1 multiplexers with inverted outputs (1Y–4Y), where E = HIGH forces all outputs HIGH regardless of S or data inputs. Its HCT logic family ensures direct interface with legacy LSTTL outputs while maintaining CMOS power efficiency.
Input thresholds are fixed for TTL compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and output drive capability supports up to 10 LSTTL loads. Propagation delays are characterized across full military temperature range (-55°C to +125°C) with CL = 50 pF load, and input capacitance is specified at 10 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible CMOS, enables direct replacement of 74LS158 without level-shifting. |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V TTL/CMOS systems; no external regulation needed. |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, industrial control, and under-hood automotive applications. |
| Propagation Delay (Data→Output) | 28–42 ns @ 4.5 V, CL = 50 pF - ensures timing predictability in synchronous bus multiplexing. |
| Output Drive Strength | ±4 mA @ VCC = 4.5 V - sufficient to drive 10 LSTTL loads, supporting fanout-critical backplane designs. |
| Input Leakage Current | ≤ ±1 µA @ -55°C to +125°C - minimizes unintended switching in high-impedance or battery-backed circuits. |
| Power Dissipation Capacitance | 35 pF - enables accurate dynamic power estimation using PD = VCC² × f × (CPD + CL). |
Pinout & Package
CD74HCT158E uses a 16-pin plastic dual in-line package (PDIP-N), 0.3-inch width, with standard through-hole mounting and RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 9, 10, 12, 13 | Data Inputs (1I0, 1I1, 2I0, 2I1, 3I0, 3I1, 4I0, 4I1) | Eight independent data inputs grouped into four 2-input pairs; each pair feeds one multiplexer channel. |
| 3 | Select Input (S) | Common control line determining which input (I0 or I1) is routed to output per channel; active-HIGH selection. |
| 6 | Enable Input (E) | Active-LOW global enable; when HIGH, all outputs forced HIGH (inverting behavior). |
| 7 | GND | Ground reference for logic and power; must be low-impedance connection to minimize noise coupling. |
| 8 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor (0.1 µF ceramic) required adjacent to pin. |
| 11, 14, 15, 16 | Inverted Outputs (1Y, 2Y, 3Y, 4Y) | Four buffered, inverted outputs - Y = NOT[(S·I1) + (NOT S·I0)] when E = LOW. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting multiplexer architecture | Outputs go HIGH when Enable is HIGH - simplifies active-HIGH reset or disable logic in bus arbitration. |
| Direct LSTTL input compatibility | Accepts standard TTL voltage levels (0.8 V/2.0 V thresholds) without external biasing or level shifters. |
| Wide temperature operation | Validated from -55°C to +125°C - eliminates derating calculations for harsh-environment deployments. |
| Low dynamic power consumption | CPD = 35 pF enables sub-mW operation at 1 MHz with 50 pF load - critical for thermally constrained modules. |
| Buffered inputs and outputs | Prevents loading effects between cascaded stages and maintains signal integrity across PCB traces. |
Applications
| Industrial PLC I/O Multiplexing | Automotive Sensor Data Routing |
|---|---|
Use Scenario: Consolidating discrete sensor inputs (e.g., temperature, pressure, position) onto shared microcontroller ADC channels via time-division sampling. IC Role / Device Role / Timing Role: Quad 2:1 inverting multiplexer selects among two sensor groups per cycle; Enable synchronizes with ADC conversion trigger. Use Value: Reduces GPIO count by 50% versus individual connections; inverting outputs simplify active-LOW interrupt assertion logic. | Use Scenario: Routing diagnostic signals from dual-redundant ECUs to a central gateway controller during fault isolation sequences. IC Role / Device Role / Timing Role: Data selector controlled by ECU health status bits; Select line chooses primary vs. backup signal path. Use Value: Enables fail-operational behavior without FPGA or microcontroller intervention; -55°C to +125°C rating supports engine bay placement. |
| Legacy System Bus Interface | Test Equipment Signal Switching |
Use Scenario: Adapting vintage 74LS-based control logic to modern 5 V CMOS processors by bridging voltage and timing domains. IC Role / Device Role / Timing Role: Level-translating multiplexer replacing obsolete 74LS158; identical pinout and DC specs ensure drop-in replacement. Use Value: Eliminates redesign of PCBs and firmware; HCT's 28 ns max delay meets original LS timing budgets. | Use Scenario: Automated test fixtures requiring programmable routing of stimulus signals to DUT pins under microcontroller control. IC Role / Device Role / Timing Role: Signal path selector driven by MCU GPIOs; Enable enables/disables entire bank during calibration phases. Use Value: Supports 4-channel parallel test execution; ±4 mA drive ensures clean edges into 50 Ω coaxial paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT158N | Same HCT logic family, identical pinout, 4.5–5.5 V supply, but rated only for -40°C to +85°C industrial range. | Limited to commercial/industrial environments; not suitable for extended temperature or military use. | Choose SN74HCT158N only if ambient operating temperature stays within -40°C to +85°C and MIL-STD-883 qualification is unnecessary. |
| CD74HC158E | Same package and pinout, but HC family: 2–6 V supply, higher noise immunity (30% VCC), no TTL input compatibility. | Requires level-shifting when interfacing with legacy TTL; unsuitable for direct 74LS replacement. | Select CD74HC158E only when system uses mixed-voltage rails or prioritizes ultra-low static power over TTL interoperability. |
Compared with SN74HCT158N, CD74HCT158E offers extended temperature support and military-grade reliability; compared with CD74HC158E, it guarantees seamless integration with existing LSTTL logic without redesigning input networks.
Availability
CD74HCT158E is available at Aetrix Electronics and suitable for industrial automation, aerospace avionics, and automotive control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT158E 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 high-reliability component development.
The CD74HCT158E belongs to TI's legacy high-speed CMOS logic portfolio, designed specifically for drop-in replacement of bipolar TTL multiplexers in mission-critical systems demanding wide temperature operation and robust noise immunity.
FAQ
What is the logic function implemented by CD74HCT158E?
The CD74HCT158E implements four independent 2:1 inverting multiplexers. Each output Y equals NOT[(S·I1) + (NOT S·I0)] when Enable (E) is LOW; when E is HIGH, all outputs are forced HIGH. This differs from the non-inverting CD74HCT157E, making CD74HCT158E ideal for active-HIGH disable schemes and inverted bus control.
Does CD74HCT158E support 3.3 V operation?
No, CD74HCT158E does not support 3.3 V operation. Its HCT family specification mandates a supply voltage range of 4.5 V to 5.5 V. For 3.3 V systems, consider logic-level translation or alternative families such as SN74LVC158A, which operates from 1.65 V to 3.6 V and provides compatible functionality.
Is CD74HCT158E pin-compatible with 74LS158?
Yes, CD74HCT158E is pin-compatible and electrically compatible with 74LS158. It uses the same 16-pin PDIP footprint, matches TTL input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), and delivers equivalent output drive (±4 mA), enabling direct replacement without PCB or schematic changes.
What is the maximum clock/data frequency supported by CD74HCT158E?
CD74HCT158E does not operate on a clock; it is combinational logic. Its usable data rate depends on propagation delay and load. With CL = 50 pF and VCC = 4.5 V, tPLH/tPHL is 28–42 ns, supporting reliable operation up to ~12 MHz in worst-case routing scenarios. For higher speeds, verify setup/hold margins against driving source characteristics.
How is the Enable (E) pin used in CD74HCT158E?
The Enable (E) pin on CD74HCT158E is active-LOW. When E = LOW, the device functions normally: outputs reflect selected inverted inputs. When E = HIGH, all four outputs (1Y–4Y) are forced HIGH regardless of Select (S) or data inputs - providing a hardware-global disable function useful for bus contention avoidance or power sequencing.
CD74HCT158E 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:
- 4 x 2:1
- 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
CD74HCT158E FAQ
1.How can I place an order for CD74HCT158E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT158E 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 CD74HCT158E reliable?
The price and inventory of CD74HCT158E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT158E is usually 5 days.
3.What payment methods are accepted for CD74HCT158E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT158E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT158E?
CD74HCT158E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT158E 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 CD74HCT158E?
For technical support, including CD74HCT158E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT158E requirements.
6.How does Aetrix verify that CD74HCT158E is sourced from the original manufacturer or authorized distributors?
All CD74HCT158E 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 CD74HCT158E meets industry standards.
7.What is the process for return or replacement of CD74HCT158E?
All CD74HCT158E units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT158E, 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 CD74HCT158E part is unused and in its original packaging.
Return procedure for CD74HCT158E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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