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Texas Instruments CD74HC237MT
- Part No.:
- CD74HC237MT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HC237MT.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,640
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Product details
Overview
CD74HC237MT from Texas Instruments is a high-speed CMOS 3-to-8 line decoder/demultiplexer with address latches, configured for active-high output selection. It features three binary select inputs (A0–A2), dual output enables (OE0/OE1), latch enable (LE), and operates across 2V–6V supply range. With typical propagation delay of 13ns at VCC = 5V/15pF and wide -55°C to +125°C temperature range, it serves in memory address decoding and data routing within industrial control systems.
For engineers reviewing the CD74HC237MT datasheet, CD74HC237MT pinout, CD74HC237MT application, or CD74HC237MT equivalent, key selection criteria include latch-controlled output isolation, active-high decoded outputs, SOIC-16 package compatibility, and guaranteed operation over extended temperature extremes without derating.
Technical Context
The CD74HC237MT implements a 3-bit address latch followed by an active-high 1-of-8 decoder, enabling transparent input-to-output behavior when LE is low and latched output stability when LE transitions high. Its dual OE inputs support cascading and demultiplexing modes - one OE acts as data input while the other remains asserted.
It belongs to the HC logic family, delivering CMOS-level power efficiency with TTL-compatible speed: fanout of 10 LSTTL loads, balanced transition times, and noise immunity of 30% of VCC at VCC = 5V for both NIH and NIL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-Speed CMOS (HC), not TTL-compatible input thresholds |
| Supply Voltage Range | 2V to 6V - supports single-supply operation in mixed-voltage systems |
| Propagation Delay | 13ns typical at VCC = 5V, CL = 15pF - enables ≤30MHz address decode timing |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial environments |
| Output Configuration | Active-high decoded outputs (Y0–Y7) - differs from '137 series' active-low behavior |
| Input Capacitance | 10pF max - minimizes loading on driving logic stages |
| Power Dissipation Cap. | 23pF at VCC = 5V - used to calculate dynamic power: PD = VCC² × f × (CPD + CL) |
Pinout & Package
CD74HC237MT is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package, 3.9mm width, with standard 1.27mm pitch and gull-wing leads. Pin 1 is marked via laser etch or mold index, and the package meets JEDEC MS-012 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | Binary Address Input | LSB of 3-bit address; sampled on LE rising edge when latched |
| 2 (A1) | Binary Address Input | Middle bit of address; determines Y1/Y3/Y5/Y7 activation |
| 3 (A2) | Binary Address Input | MSB of address; selects upper or lower half of output set |
| 4 (LE) | Latch Enable | Active-high control: low = transparent mode, high = latched output hold |
| 5 (OE1) | Output Enable 1 | Active-low enable; must be low for output activation; used as cascade/demux control |
| 6 (OE0) | Output Enable 0 | Active-low enable; second enable for hierarchical design or data path selection |
| 7 (GND) | Ground Reference | Return path for all internal logic and output drivers; requires low-impedance PCB connection |
| 8 (Y0) | Decoder Output | Active-high output corresponding to A2A1A0 = 000; drives load directly |
| 9 (VCC) | Positive Supply | 2V–6V CMOS supply rail; bypass capacitor recommended near pin |
| 10 (Y1) | Decoder Output | Active-high output for A2A1A0 = 001; electrically identical to Y0–Y7 |
| 11 (Y2) | Decoder Output | Active-high output for A2A1A0 = 010; shares same drive strength and timing |
| 12 (Y3) | Decoder Output | Active-high output for A2A1A0 = 011; no internal inversion relative to address |
| 13 (Y4) | Decoder Output | Active-high output for A2A1A0 = 100; maintains consistent output polarity |
| 14 (Y5) | Decoder Output | Active-high output for A2A1A0 = 101; supports parallel bus decoding |
| 15 (Y6) | Decoder Output | Active-high output for A2A1A0 = 110; compatible with 8-bit data paths |
| 16 (Y7) | Decoder Output | Active-high output for A2A1A0 = 111; final output in 1-of-8 decode set |
Key Features
| Feature | Design Value |
|---|---|
| Latch-enabled address isolation | Prevents output glitches during address transitions; critical for stable memory mapping |
| Dual active-low output enables | Enables hierarchical decoding across multiple devices without external gating logic |
| Active-high decoded outputs | Eliminates need for external inverters in systems requiring high-true select signals |
| 13ns propagation delay @ 5V | Supports real-time address decoding in sub-40MHz digital subsystems |
| 2V–6V wide supply range | Allows interoperability with 3.3V microcontrollers and legacy 5V peripherals |
| 10 LSTTL fanout capability | Drives multiple downstream logic inputs without buffer amplification |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Expanding discrete input/output points in programmable logic controllers using shared address/data buses. IC Role / Device Role / Timing Role: Address decoder that routes CPU address lines to individual relay driver ICs or sensor interface channels. Use Value: Latched decoding prevents spurious channel activation during address settling; SOIC-16 footprint simplifies layout in space-constrained DIN-rail modules. | Use Scenario: Selecting between multiple CAN transceiver diagnostic ports or lighting driver banks in centralized vehicle ECUs. IC Role / Device Role / Timing Role: Demultiplexer that routes microcontroller GPIO signals to specific subsystems based on mode configuration bits. Use Value: Active-high outputs align with default high-assertion logic in automotive wake-up circuits; -55°C to +125°C rating ensures reliability under hood conditions. |
| Avionics Sensor Multiplexing | Test Equipment Signal Routing |
Use Scenario: Time-division multiplexing of analog sensor outputs (temperature, pressure, acceleration) onto a shared ADC input channel. IC Role / Device Role / Timing Role: Decoder controlling analog switch enable lines in synchronized sampling sequences. Use Value: Precise 13ns propagation delay enables deterministic timing margins in safety-critical sampling windows; radiation-tolerant process supports avionics qualification paths. | Use Scenario: Configurable signal path selection in automated test equipment (ATE) switching matrices for DUT stimulus/response routing. IC Role / Device Role / Timing Role: Address-latched selector for relays or solid-state switches in multi-channel test fixtures. Use Value: Dual OE inputs allow hierarchical fixture control from master controller; latch function freezes routing state during reconfiguration bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC137M96 | Active-low outputs; otherwise identical pinout, timing, and electrical specs | Requires external inverters if system expects high-true selection; unsuitable where output polarity is fixed | Select only when legacy designs mandate active-low decode behavior |
| SN74HC237N | Same functionality and pinout but in PDIP-16 package; slightly higher θJA (67°C/W vs. 73°C/W) | Preferred for prototyping or through-hole assembly; not suitable for high-density SMT production | Choose for breadboarding or low-volume hand-soldered assemblies |
Compared with CD74HC137M96 and SN74HC237N, the CD74HC237MT provides native active-high outputs in a surface-mount SOIC package optimized for automated manufacturing and thermal performance in compact enclosures.
Availability
CD74HC237MT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, avionics sensor multiplexing, and test equipment signal routing requiring stable component supply across extended temperature ranges.
Supply support for CD74HC237MT 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 communications markets.
The CD74HC237MT belongs to TI's High-Speed CMOS logic family, designed specifically for robust address decoding and data routing in harsh-environment digital systems where latch stability, wide voltage operation, and temperature resilience are mandatory.
FAQ
What is the function of the LE pin on the CD74HC237MT?
The LE (Latch Enable) pin on the CD74HC237MT controls whether the device operates in transparent or latched mode. When LE is low, outputs follow A0–A2 inputs in real time; when LE goes high, the current address is latched and outputs remain stable despite subsequent input changes. This behavior is essential for glitch-free memory addressing and is explicitly defined in the 'HC237 truth table.
Does the CD74HC237MT support 3.3V operation?
Yes, the CD74HC237MT fully supports 3.3V operation as part of its 2V–6V supply range. At VCC = 3.3V, it maintains valid logic thresholds (VIH ≥ 2.31V, VIL ≤ 0.99V), delivers typical propagation delay under 20ns, and sustains full fanout capability - making it interoperable with 3.3V microcontrollers without level-shifting.
How does the CD74HC237MT differ from the CD74HC137MT?
The CD74HC237MT differs from the CD74HC137MT solely in output polarity: CD74HC237MT provides active-high decoded outputs (Y0–Y7 go high on selection), whereas CD74HC137MT provides active-low outputs. All other parameters - pinout, timing, supply range, latch behavior, and enable logic - are identical between the two parts.
What is the maximum clock frequency supported by the CD74HC237MT?
The CD74HC237MT does not operate on a clock signal; it is combinational logic with latch control. Its usable switching rate depends on propagation delay and system setup/hold timing. With 13ns typical tPLH/tPHL at 5V/15pF, it supports reliable address decode cycles up to approximately 30MHz in well-designed layouts with controlled trace capacitance.
Is the CD74HC237MT RoHS compliant?
Yes, the CD74HC237MT is RoHS compliant, as confirmed in Texas Instruments' official packaging addendum. It uses NiPdAu (NIPDAU) lead finish, carries MSL Level-1 rating, and meets JEDEC J-STD-020 moisture sensitivity requirements for standard reflow profiles up to 260°C peak.
CD74HC237MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HC237MT FAQ
1.How can I place an order for CD74HC237MT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC237MT 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 CD74HC237MT reliable?
The price and inventory of CD74HC237MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC237MT is usually 5 days.
3.What payment methods are accepted for CD74HC237MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC237MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC237MT?
CD74HC237MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC237MT 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 CD74HC237MT?
For technical support, including CD74HC237MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC237MT requirements.
6.How does Aetrix verify that CD74HC237MT is sourced from the original manufacturer or authorized distributors?
All CD74HC237MT 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 CD74HC237MT meets industry standards.
7.What is the process for return or replacement of CD74HC237MT?
All CD74HC237MT units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC237MT, 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 CD74HC237MT part is unused and in its original packaging.
Return procedure for CD74HC237MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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