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Texas Instruments CD74HCT32ME4
- Part No.:
- CD74HCT32ME4
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT32ME4.pdf
- Description:
- IC GATE OR 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,006
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Product details
Overview
CD74HCT32ME4 from Texas Instruments is a quadruple 2-input OR gate IC in SOIC-14 package, performing Y = A + B Boolean logic per channel with TTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2 V), 4.5–5.5 V supply range, and operation from –55°C to +125°C. It drives up to 10 LSTTL loads and delivers 30 ns typical propagation delay at 4.5 V with 50 pF load.
For engineers reviewing the CD74HCT32ME4 datasheet, CD74HCT32ME4 pinout, CD74HCT32ME4 application, or CD74HCT32ME4 equivalent, this page provides verified functional roles, thermal limits, input/output voltage thresholds, switching behavior under load, and real-world implementation guidance for fan enable logic, error-signal aggregation, and active-low signal combining.
Technical Context
The CD74HCT32ME4 implements four independent positive-logic OR gates using buffered CMOS inputs compatible with both LSTTL and standard CMOS logic families. Its input structure features clamping diodes and ≤1 µA leakage at VOH/VOL, enabling robust interfacing across mixed-voltage systems.
Each gate exhibits balanced push-pull output drive capable of sourcing 4 mA (VOH ≥ 3.7 V) and sinking 4 mA (VOL ≤ 0.4 V) while maintaining rail-to-rail output swing. Propagation delay is specified over full temperature and voltage range, with 36 ns max at –55°C to +125°C and 4.5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Four independent 2-input OR gates; each implements Y = A + B in positive logic |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL and CMOS systems without level shifting |
| Input Thresholds | VIL(max) = 0.8 V, VIH(min) = 2.0 V - enables direct interface with legacy LSTTL outputs |
| Propagation Delay | 36 ns max (–55°C to +125°C, CL = 50 pF) - defines worst-case timing margin for synchronous logic design |
| Output Drive | Sources/sinks ±4 mA at VOH/VOL - supports fanout of 10 LSTTL loads without external buffering |
| Operating Temperature | –55°C to +125°C - qualified for industrial, automotive under-hood, and military-grade applications |
| Input Leakage | ±1 µA max (VI = VCC/GND, TA = –55°C to +125°C) - minimizes static current draw in battery-backed or low-power monitoring circuits |
Pinout & Package
CD74HCT32ME4 is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm with 1.27 mm lead pitch and 1.75 mm max height. The package is RoHS-compliant, moisture-sensitive Level-1 (unlimited reflow), and designed for surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 1B | Input | Channel 1 OR gate inputs - must be terminated to VCC or GND if unused to prevent floating states |
| 1Y | Output | Channel 1 OR result - capable of driving CMOS or LSTTL loads; avoid direct connection to VCC/GND |
| 2A, 2B | Input | Channel 2 OR gate inputs - share same electrical characteristics and noise immunity as 1A/1B |
| 2Y | Output | Channel 2 OR result - electrically isolated from other channels; supports independent loading |
| GND (Pin 7) | Power Reference | System ground return path - requires low-inductance connection to minimize switching noise coupling |
| 3A, 3B | Input | Channel 3 OR gate inputs - identical timing and threshold specs to all other inputs |
| 3Y | Output | Channel 3 OR result - usable for cascaded logic (e.g., building 4-input OR with three gates) |
| 4A, 4B | Input | Channel 4 OR gate inputs - fully independent; no internal crosstalk with other channels |
| 4Y | Output | Channel 4 OR result - can serve as spare gate or dedicated system-level enable signal |
| VCC (Pin 14) | Power Supply | +4.5 V to +5.5 V supply - requires local 0.1 µF bypass capacitor placed adjacent to pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL-compatible inputs | VIL ≤ 0.8 V / VIH ≥ 2.0 V enables direct replacement of 74LS32 without redesigning upstream drivers |
| Low quiescent current | ICC ≤ 40 µA max at 5.5 V allows use in always-on monitoring circuits without significant standby power penalty |
| Wide temperature range | –55°C to +125°C operation supports deployment in harsh environments including engine control units and industrial PLCs |
| Buffered inputs | Reduces capacitive loading on driving sources and improves noise immunity against coupled transients |
| Clamp diode protection | Integrated input/output clamps limit transient voltages to ±0.5 V beyond rails, enhancing ESD robustness per IEC 61000-4-2 |
Applications
| Industrial Fan Enable Logic | Multi-Sensor Error Aggregation |
|---|---|
Use Scenario: Four temperature sensors monitor critical subsystems; any overheat condition must trigger immediate fan activation. IC Role / Device Role / Timing Role: CD74HCT32ME4 combines four active-high overheat signals into a single enable line for a fan driver IC via cascaded OR logic. Use Value: Eliminates need for discrete diode-OR wiring or microcontroller polling, reducing BOM count and firmware complexity while guaranteeing sub-40 ns response latency. | Use Scenario: A programmable logic controller monitors eight fault inputs across motor drives, but only four are active simultaneously. IC Role / Device Role / Timing Role: CD74HCT32ME4 serves as a hardware-based fault combiner, merging pairs of error flags before feeding them to a central watchdog timer. Use Value: Provides deterministic, zero-latency fault detection independent of software execution, meeting SIL-2 functional safety requirements for fail-safe shutdown paths. |
| Active-Low Signal Combining | Legacy System Interface Bridging |
Use Scenario: Three independent reset lines from different subsystems must assert a global reset when any one goes low. IC Role / Device Role / Timing Role: CD74HCT32ME4 implements inverted OR logic by tying inputs to pull-up resistors and using outputs to drive an open-drain buffer. Use Value: Achieves wired-OR functionality with precise voltage thresholds and controlled rise/fall times, avoiding race conditions common in passive resistor networks. | Use Scenario: Integrating a modern microcontroller with 3.3 V GPIO into a legacy 5 V backplane requiring LSTTL-compatible signaling. IC Role / Device Role / Timing Role: CD74HCT32ME4 acts as a level-translating OR gate between multiple 3.3 V interrupt sources and a 5 V interrupt controller input. Use Value: Maintains full noise margin (≥0.4 V) and fanout capability across voltage domains without external level shifters or voltage dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-input OR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT32N | Same logic function, identical electrical specs, but in PDIP-14 package (19.3 × 6.4 mm); higher thermal resistance (RθJA = 65.4°C/W vs. 102.9°C/W for SOIC) | Preferred for through-hole prototyping or legacy board rework where SOIC footprint is unavailable | Select SN74HCT32N only when manual soldering or socket-based testing is required; not suitable for high-density SMT production. |
| 74VHC32M | Higher speed (2.5 ns typ propagation delay), wider supply range (2–5.5 V), but VIH/VIL thresholds differ (VIH = 3.5 V min @ VCC = 5 V), limiting LSTTL compatibility | Better suited for mixed-supply 3.3 V/5 V systems where LSTTL interfacing is unnecessary | Choose 74VHC32M only when operating below 5 V or requiring faster switching; incompatible with direct 74LSxx replacement due to input threshold mismatch. |
Compared with SN74HCT32N and 74VHC32M, the CD74HCT32ME4 uniquely balances LSTTL compatibility, industrial temperature range, and SOIC packaging - making it optimal for space-constrained, high-reliability 5 V systems requiring drop-in legacy logic replacement.
Availability
CD74HCT32ME4 is available at Aetrix Electronics and suitable for industrial motor control, automotive thermal management, and aerospace sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT32ME4 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions with over 50 years of leadership in industrial and automotive electronics.
The CD74HCT32ME4 belongs to TI's HCT logic family, engineered specifically to provide TTL-compatible input thresholds and CMOS power efficiency for seamless integration into legacy 5 V digital systems undergoing modernization.
FAQ
What is the maximum allowable supply voltage for CD74HCT32ME4?
The absolute maximum supply voltage for CD74HCT32ME4 is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this range risks violating input/output voltage specifications and may cause excessive ICC or latch-up. TI specifies that prolonged exposure above 5.5 V degrades reliability, even if within the 7 V absolute limit.
Can CD74HCT32ME4 drive a 50 pF capacitive load reliably?
Yes, CD74HCT32ME4 is characterized for CL = 50 pF in its switching specifications: propagation delay is guaranteed at 36 ns max over –55°C to +125°C. The device's balanced push-pull output ensures clean edges into this load, though layout best practices (short traces, local decoupling) are required to maintain signal integrity and avoid ringing.
How should unused inputs on CD74HCT32ME4 be handled?
Unused inputs on CD74HCT32ME4 must be tied to either VCC or GND - never left floating. TI recommends 10 kΩ pull-up or pull-down resistors for flexibility. Direct connection is acceptable if the input is permanently inactive. Floating inputs cause undefined logic states, increased ICC, and potential oscillation due to high-impedance CMOS inputs capturing noise.
Does CD74HCT32ME4 support operation at –55°C?
Yes, CD74HCT32ME4 is fully specified from –55°C to +125°C per its Recommended Operating Conditions table. All key parameters - including VOH, VOL, tpd, and II - are guaranteed across this range. This makes CD74HCT32ME4 suitable for aerospace, downhole, and military applications where extreme cold tolerance is mandatory.
Is CD74HCT32ME4 pin-compatible with CD74HCT32M?
Yes, CD74HCT32ME4 and CD74HCT32M share identical pinout, electrical specifications, and functional behavior. The "E4" suffix denotes TI's enhanced manufacturing flow and RoHS compliance, but the SOIC-14 footprint, terminal assignments, and logic operation are identical - enabling direct substitution without PCB changes.
CD74HCT32ME4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- OR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 4mA, 4mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 24ns @ 4.5V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
CD74HCT32ME4 FAQ
1.How can I place an order for CD74HCT32ME4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT32ME4 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 CD74HCT32ME4 reliable?
The price and inventory of CD74HCT32ME4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT32ME4 is usually 5 days.
3.What payment methods are accepted for CD74HCT32ME4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT32ME4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT32ME4?
CD74HCT32ME4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT32ME4 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 CD74HCT32ME4?
For technical support, including CD74HCT32ME4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT32ME4 requirements.
6.How does Aetrix verify that CD74HCT32ME4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT32ME4 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 CD74HCT32ME4 meets industry standards.
7.What is the process for return or replacement of CD74HCT32ME4?
All CD74HCT32ME4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT32ME4, 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 CD74HCT32ME4 part is unused and in its original packaging.
Return procedure for CD74HCT32ME4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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