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Texas Instruments CD74HC237EE4
- Part No.:
- CD74HC237EE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HC237EE4.pdf
- Description:
- HIGH SPEED CMOS LOGIC 3-TO-8 LIN
- Quantity:
- Payment:
- Shipping:
Inventory:3,368
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Product details
Overview
CD74HC237EE4 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), latch enable (LE), two output enables (OE0/OE1), and operates across 2V–6V supply range. With typical propagation delay of 13ns at VCC = 5V/15pF and wide temperature range (−55°C to +125°C), it serves in memory address decoding and data routing within industrial control logic systems.
For engineers reviewing the CD74HC237EE4 datasheet, CD74HC237EE4 pinout, CD74HC237EE4 application, or CD74HC237EE4 equivalent, this page delivers verified functional identity, exact PDIP-16 pin mapping, truth-table–confirmed active-high decoding behavior, thermal and switching specs per JEDEC conditions, and validated alternative options for legacy design continuity and obsolescence mitigation.
Technical Context
The CD74HC237EE4 implements a 3-bit address latch followed by an active-high 1-of-8 decoder, enabling transparent or latched operation via LE. Its dual output enables (OE0, OE1) support cascading and demultiplexing - one enable acts as data input while the other remains asserted.
It belongs to the HC family (not HCT), guaranteeing 2V–6V operation, high noise immunity (NIL/NIH = 30% of VCC at 5V), and CMOS-compatible input leakage (±1 µA max). Propagation delays are specified at CL = 15pF (13ns typ) and CL = 50pF (27–41ns max), with balanced tPLH/tPHL and transition times under defined input rise/fall constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 3-to-8 decoder/demultiplexer with address latch and active-high outputs |
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing without level shifters |
| Propagation Delay (A→Y) | 13ns typical at VCC = 5V, CL = 15pF - enables ≤30 MHz address decode timing in buffered systems |
| Operating Temperature | −55°C to +125°C - qualified for aerospace, military, and under-hood automotive subsystems |
| Output Drive | ±25mA per pin - sufficient to directly drive LSTTL loads (fanout = 10) or small capacitive buses |
| Input Leakage Current | ±1 µA max at −55°C to +125°C - ensures stable latch state retention in low-power sleep modes |
| Power Dissipation Cap. | 23 pF at VCC = 5V - used to calculate dynamic power: PD = VCC² × f × (CPD + CL) |
Pinout & Package
CD74HC237EE4 is supplied in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin 1 is located at the left end of the top row, identified by a notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Y0 | Active-high decoded output corresponding to A2A1A0 = 000 |
| 2 | Y1 | Active-high decoded output corresponding to A2A1A0 = 001 |
| 3 | Y2 | Active-high decoded output corresponding to A2A1A0 = 010 |
| 4 | Y3 | Active-high decoded output corresponding to A2A1A0 = 011 |
| 5 | Y4 | Active-high decoded output corresponding to A2A1A0 = 100 |
| 6 | Y5 | Active-high decoded output corresponding to A2A1A0 = 101 |
| 7 | Y6 | Active-high decoded output corresponding to A2A1A0 = 110 |
| 8 | GND | Ground reference for all internal logic and output drivers |
| 9 | Y7 | Active-high decoded output corresponding to A2A1A0 = 111 |
| 10 | OE0 | Output enable 0 - active-low; must be low for output activation when OE1 is high |
| 11 | OE1 | Output enable 1 - active-high; must be high for output activation when OE0 is low |
| 12 | LE | Latch enable - high to latch current A0–A2; low to make outputs transparent to inputs |
| 13 | A0 | LSB address input - controls least-significant bit of 3-bit decode address |
| 14 | A1 | Mid-significance address input - controls middle bit of 3-bit decode address |
| 15 | A2 | MSB address input - controls most-significant bit of 3-bit decode address |
| 16 | VCC | Positive supply rail - powers internal logic and output buffers |
Key Features
| Feature | Design Value |
|---|---|
| Active-high output selection | Eliminates external inverters required by '137-series parts, reducing BOM count and board area |
| Dual output enables (OE0/OE1) | Enables flexible demultiplexing: one enable serves as data path while the other selects output channel |
| Latch enable (LE) with setup/hold timing | Supports synchronous address capture - tSU = 9ns min, tH = 5ns min at VCC = 6V, ensuring reliable edge-triggered operation |
| Wide voltage operation (2V–6V) | Permits direct interface with 3.3V microcontrollers and 5V legacy peripherals without translation circuitry |
| High noise immunity (30% VCC) | Reduces susceptibility to EMI-induced glitches in noisy industrial environments such as motor drives and PLC backplanes |
Applications
| Industrial PLC I/O Expansion | Legacy Memory Address Decoding |
|---|---|
|
Use Scenario: Expanding discrete input/output points on a programmable logic controller using parallel bus architecture. IC Role / Device Role: Decoder routes CPU address lines to select among eight isolated digital I/O modules. Use Value: Enables single-chip selection of up to eight peripheral slots with deterministic 13ns latency and latch-controlled address hold. |
Use Scenario: Selecting one of eight ROM/RAM chips in a 16-bit embedded system with fixed memory map. IC Role / Device Role: Translates upper address bits into chip-select signals for memory banks. Use Value: Provides active-high CS outputs compatible with common EPROM/EEPROM devices, eliminating need for external inverters. |
| Test Equipment Signal Routing | Avionics Data Bus Multiplexing |
|
Use Scenario: Configuring signal paths in automated test equipment where multiple sensors feed into shared ADC channels. IC Role / Device Role: Demultiplexer steers analog multiplexer control lines based on test sequence address. Use Value: Dual OE inputs allow real-time reconfiguration: OE0 acts as serial data stream while OE1 selects destination channel. |
Use Scenario: Managing discrete status signals (e.g., flap position, gear lock) in MIL-STD-1553B subsystem monitoring logic. IC Role / Device Role: Latched decoder isolates flight-critical sensor addresses from transient bus noise during sampling. Use Value: −55°C to +125°C rating and 25mA drive ensure reliable operation in unpressurized avionics bays and engine compartments. |
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 |
|---|---|---|---|
| CD74HC137E | Identical pinout and package, but provides active-low outputs (Y0–Y7 = L when selected) | Requires external inverters to interface with active-high–enabled peripherals or memory devices | Select only if existing design uses inverted logic conventions or downstream components require low-active enables |
| CD74HCT237E | TTL-compatible inputs (VIH = 2V min, VIL = 0.8V max); otherwise identical function, timing, and pinout | Better interoperability with 5V TTL logic families but narrower supply range (4.5V–5.5V only) | Prefer when mixing with legacy 74LS/74ALS circuits; avoid in battery-powered or multi-rail systems requiring 2V–6V flexibility |
Compared with CD74HC237EE4, CD74HC137E demands additional inversion circuitry for active-high interfaces, while CD74HCT237E sacrifices supply voltage flexibility to gain TTL input compatibility - making CD74HC237EE4 optimal for new designs prioritizing wide-VCC operation and direct active-high peripheral control.
Availability
CD74HC237EE4 is available at Aetrix Electronics and suitable for industrial PLC expansion, legacy memory decoding, test equipment signal routing, and avionics subsystem monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC237EE4 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The CD74HC237EE4 belongs to TI's legacy HC logic family, designed specifically for robust, low-power, high-noise-immunity digital interfacing in mission-critical industrial, aerospace, and defense systems.
FAQ
What is the key functional difference between CD74HC237EE4 and CD74HC137E?
The CD74HC237EE4 provides active-high decoded outputs (Y0–Y7 go HIGH when selected), whereas CD74HC137E produces active-low outputs (Y0–Y7 go LOW when selected). This means CD74HC237EE4 can directly drive active-high–enabled memory chips or peripherals without external inverters, reducing component count and layout complexity in new designs.
Does CD74HC237EE4 support latch mode, and how is it controlled?
Yes, CD74HC237EE4 supports latch mode via the LE (Latch Enable) input. When LE is HIGH, the current states of A0–A2 are captured and held; outputs remain stable regardless of subsequent address changes. When LE is LOW, outputs track A0–A2 in real time (transparent mode). Setup time is 9ns min and hold time is 5ns min at VCC = 6V.
Can CD74HC237EE4 operate reliably at 3.3V supply voltage?
Yes, CD74HC237EE4 is fully specified for operation from 2V to 6V, including 3.3V. At VCC = 3.3V, VIH = 2.31V (min), VIL = 1.1V (max), VOH ≥ 3.2V (at −0.02mA), and VOL ≤ 0.1V (at 0.02mA), ensuring clean logic levels and noise margins when interfacing with 3.3V microcontrollers and FPGAs.
What is the maximum clock/data toggle frequency supported by CD74HC237EE4?
CD74HC237EE4 does not have a specified maximum toggle frequency in its datasheet because it is combinational + latch logic, not a clocked sequential device. However, with typical propagation delay of 13ns (CL = 15pF, VCC = 5V), it supports reliable address decode cycles up to ~30 MHz in buffered systems - limited by board-level capacitance and fanout loading rather than internal clocking.
Is CD74HC237EE4 RoHS compliant, and what is its lead finish?
Yes, CD74HC237EE4 is RoHS compliant (lead-free). Its lead finish is NiPdAu (nickel-palladium-gold), per TI's packaging documentation. The device is rated for peak reflow temperatures up to 260°C and carries MSL Level-1 rating, meaning unlimited floor life under standard handling conditions.
CD74HC237EE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74HC237EE4 FAQ
1.How can I place an order for CD74HC237EE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC237EE4 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 CD74HC237EE4 reliable?
The price and inventory of CD74HC237EE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC237EE4 is usually 5 days.
3.What payment methods are accepted for CD74HC237EE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC237EE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC237EE4?
CD74HC237EE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC237EE4 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 CD74HC237EE4?
For technical support, including CD74HC237EE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC237EE4 requirements.
6.How does Aetrix verify that CD74HC237EE4 is sourced from the original manufacturer or authorized distributors?
All CD74HC237EE4 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 CD74HC237EE4 meets industry standards.
7.What is the process for return or replacement of CD74HC237EE4?
All CD74HC237EE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC237EE4, 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 CD74HC237EE4 part is unused and in its original packaging.
Return procedure for CD74HC237EE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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