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Texas Instruments CD74HCT137M96
- Part No.:
- CD74HCT137M96
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT137M96.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,721
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Product details
Overview
CD74HCT137M96 from Texas Instruments is a high-speed CMOS 3-to-8 line decoder/demultiplexer with address latches, designed for memory address decoding and data routing. It features active-low outputs, dual output enables (OE0, OE1), latch enable (LE), three binary select inputs (A0–A2), and operates at 4.5V–5.5V with propagation delay of 16ns (typ) at VCC = 5V, CL = 15pF, TA = 25°C.
For engineers reviewing the CD74HCT137M96 datasheet, CD74HCT137M96 pinout, CD74HCT137M96 application, or CD74HCT137M96 equivalent, key selection criteria include its latch-enabled address isolation, LSTTL-compatible input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V), wide –55°C to +125°C operating range, and SOIC-16 packaging for industrial control and embedded systems requiring reliable signal routing.
Technical Context
The CD74HCT137M96 implements a 3-bit address latch followed by an active-low 1-of-8 decoder. Its LE input latches A0–A2 on rising edge, isolating outputs from subsequent address changes-enabling stable demultiplexing in asynchronous bus environments. Output enables OE0 and OE1 allow cascading and flexible data routing: one can serve as data input while the other remains asserted.
It uses HCT logic family architecture, ensuring direct compatibility with TTL-level inputs while delivering CMOS power efficiency. Propagation delays are balanced across all paths (tPLH ≈ tPHL), and transition times remain consistent (tTLH/tTHL ≤ 22ns at VCC = 4.5V, CL = 50pF), supporting clean signal integrity in mixed-logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - ensures direct LSTTL input compatibility without level-shifting circuitry |
| Supply Voltage | 4.5V to 5.5V - matches standard 5V digital rails and avoids under-voltage lockout |
| Propagation Delay | 16ns (typ) at VCC = 5V, CL = 15pF - supports >30 MHz address/data switching in buffered decode paths |
| Operating Temperature | –55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial motor control |
| Output Polarity | Active-low (Y0–Y7) - directly drives enable inputs of 74-series peripherals or reset lines |
| Input Thresholds | VIL ≤ 0.8V, VIH ≥ 2.0V - guarantees noise-immune interfacing with legacy TTL and microcontroller GPIO |
| Quiescent Current | ≤160µA (max) over full temp range - enables low-power standby in battery-backed systems |
Pinout & Package
CD74HCT137M96 is housed in a 16-pin SOIC (D) package, 7.5mm × 10.3mm body size, 1.27mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1, tape-and-reel format (2500 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 15 | Y0–Y7 (active-low outputs) | Eight decoded outputs; only one asserted low per valid address; used for chip select or peripheral enable |
| 8 | GND | Ground reference for all logic and output stages; must be low-impedance for noise immunity |
| 9, 10, 11 | A0, A1, A2 (address inputs) | Binary-select inputs latched on LE rising edge; determine which Yx activates |
| 12 | OE0 (output enable 0) | Primary enable; when low, allows output state to reflect latched address; used for gating decode output |
| 13 | OE1 (output enable 1) | Secondary enable; when low, permits demultiplexing mode when OE0 serves as data input |
| 14 | LE (latch enable) | Rising-edge-triggered latch control; freezes A0–A2 value for stable output during address bus transitions |
| 16 | VCC | Positive supply; must be decoupled locally (0.1µF ceramic) near pin to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Address Latching | Latches A0–A2 on LE rising edge, enabling glitch-free decode in asynchronous address buses |
| Dual Output Enables | OE0/OE1 support both cascaded decoding (e.g., 16-bit address) and true 1:8 demultiplexing |
| LSTTL-Compatible Inputs | Accepts standard TTL voltage levels without external biasing-reduces BOM count and layout complexity |
| Wide Temperature Range | –55°C to +125°C operation eliminates derating concerns in harsh environments |
| Low Power Consumption | Typical ICC < 8µA at 25°C enables use in always-on monitoring subsystems |
Applications
| Memory Address Decoding | Industrial I/O Expansion |
|---|---|
Use Scenario: Selecting among eight peripheral ICs (e.g., ADCs, DACs, UARTs) sharing a common data bus in a PLC backplane. IC Role / Device Role: Address decoder that converts 3-bit CPU address lines into individual chip-select signals. Use Value: Eliminates need for discrete logic gates; latch function prevents spurious selects during address settling. | Use Scenario: Routing sensor data streams from eight analog front-ends to a single microcontroller ADC input. IC Role / Device Role: Demultiplexer using OE0 as data input and A0–A2 to route channel-specific samples. Use Value: Reduces PCB layer count vs. multiplexer-based solutions; active-low outputs interface directly with open-drain sensor interfaces. |
| Automotive ECU Subsystem Control | Test Equipment Signal Routing |
Use Scenario: Enabling diagnostic LEDs, solenoid drivers, or CAN transceiver standby modes based on microcontroller command codes. IC Role / Device Role: Latched decoder driving low-side switches or optocoupler inputs in safety-critical modules. Use Value: Guaranteed output stability across temperature extremes ensures deterministic fault response in ASIL-B designs. | Use Scenario: Configuring stimulus paths in automated test equipment where multiple DUTs share a common signal generator. IC Role / Device Role: Cascaded decoder (using OE1) to expand 3-bit control to 64 unique test configurations. Use Value: Dual enable architecture simplifies firmware control-no additional GPIO required for cascade enable logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT137N | Same logic function, pinout, and electrical specs; PDIP-16 package instead of SOIC-16 | Through-hole mounting; higher thermal resistance (θJA = 67°C/W vs. 73°C/W); no tape-and-reel option | Select for prototyping or legacy through-hole boards where reflow compatibility is not required |
| CD74HCT237M96 | Identical package and pinout, but active-high outputs (Y0–Y7 high when selected) | Requires inverted logic in downstream enable paths; unsuitable where active-low reset/enable is mandatory | Choose only if system design requires active-high assertion-verify compatibility with connected peripherals' input polarity |
Compared with SN74HCT137N and CD74HCT237M96, the CD74HCT137M96 provides surface-mount reliability, tape-and-reel manufacturability, and guaranteed active-low output behavior-making it optimal for high-volume industrial PCB assembly where latch stability and polarity alignment are critical.
Availability
CD74HCT137M96 is available at Aetrix Electronics and suitable for memory decoding, industrial I/O expansion, automotive subsystem control, and test equipment signal routing requiring stable component supply across extended temperature ranges.
Supply support for CD74HCT137M96 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 CD74HCT137M96 belongs to TI's High-Speed CMOS Logic family, engineered for robust address decoding and data routing in industrial, automotive, and aerospace systems demanding wide temperature operation and TTL compatibility.
FAQ
What is the maximum clock frequency supported by CD74HCT137M96 in demultiplexing mode?
The CD74HCT137M96 does not operate as a clocked device-it is combinational logic with latch capability. Its usable switching rate depends on propagation delay (16ns typ) and load capacitance. With CL = 15pF and VCC = 5V, the maximum reliable toggle rate is approximately 30 MHz for address changes, assuming clean edges and proper decoupling. The CD74HCT137M96 truth table confirms timing is governed by setup/hold and pulse-width requirements-not a clock input.
Can CD74HCT137M96 be used without connecting the latch enable (LE) pin?
No-LE must be actively driven. Leaving LE floating risks metastability and unpredictable output behavior. For transparent operation (no latching), tie LE to VCC via a 10kΩ pull-up resistor; for latched operation, drive LE with a clean rising edge synchronized to address stability. The CD74HCT137M96 datasheet specifies minimum LE pulse width (10ns typ) and setup/hold times relative to A0–A2 transitions.
Does CD74HCT137M96 support hot insertion or live insertion into a powered system?
No-CD74HCT137M96 is not hot-plug rated. Its absolute maximum ratings specify no DC input voltage below GND or above VCC + 0.5V. Applying signals before VCC stabilizes may cause latch-up or excessive current flow. Always power VCC and GND first, then apply control signals. The CD74HCT137M96 datasheet cautions against electrostatic discharge and stresses adherence to proper power sequencing.
How does the dual output enable (OE0/OE1) architecture improve cascading versus single-enable decoders?
The dual enable structure allows independent control of decode enable (OE0) and cascade enable (OE1). When cascading two CD74HCT137M96 devices, OE1 of the first stage drives OE0 of the second, enabling hierarchical addressing (e.g., 4-bit → 16 outputs) without external logic. This reduces gate count, propagation delay, and board space versus using discrete AND gates-verified in TI's application notes for memory expansion using CD74HCT137M96.
Is CD74HCT137M96 pin-compatible with CD74HC137 variants?
Yes-CD74HCT137M96 shares identical pinout and package (SOIC-16) with CD74HC137M96, but differs in supply voltage range (HC: 2–6V; HCT: 4.5–5.5V) and input thresholds. Swapping them requires verifying VCC stability and input source compatibility; CD74HCT137M96 will not function reliably below 4.5V, while CD74HC137M96 may misinterpret TTL inputs at 5V due to higher VIH requirement.
CD74HCT137M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- 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
CD74HCT137M96 FAQ
1.How can I place an order for CD74HCT137M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT137M96 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 CD74HCT137M96 reliable?
The price and inventory of CD74HCT137M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT137M96 is usually 5 days.
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CD74HCT137M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT137M96 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 CD74HCT137M96?
For technical support, including CD74HCT137M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT137M96 requirements.
6.How does Aetrix verify that CD74HCT137M96 is sourced from the original manufacturer or authorized distributors?
All CD74HCT137M96 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 CD74HCT137M96 meets industry standards.
7.What is the process for return or replacement of CD74HCT137M96?
All CD74HCT137M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT137M96, 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 CD74HCT137M96 part is unused and in its original packaging.
Return procedure for CD74HCT137M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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