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Texas Instruments CD74HCT32M
- Part No.:
- CD74HCT32M
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT32M.pdf
- Description:
- IC GATE OR 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
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Product details
Overview
CD74HCT32M from Texas Instruments is a quad 2-input OR gate IC in SOIC-14 package, operating from 4.5 V to 5.5 V with LSTTL- and CMOS-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2 V), propagation delay of 24–36 ns at 4.5 V, and rated for –55°C to +125°C industrial/military temperature range. It performs Y = A + B logic per gate and supports fanout of up to 10 LSTTL loads.
For engineers reviewing the CD74HCT32M datasheet, CD74HCT32M pinout, CD74HCT32M application, or CD74HCT32M equivalent, this page delivers verified functional identity, SOIC-14 terminal mapping, electrical behavior under 4.5–5.5 V supply, thermal limits, and real-world use cases including active-high enable signal aggregation and error-signal monitoring in harsh-environment control systems.
Technical Context
The CD74HCT32M implements four independent positive-logic OR gates (Y = A + B) using HCMOS technology with TTL-compatible input thresholds and balanced push-pull outputs. Its inputs feature clamping diodes and ≤1 µA leakage at 5.5 V, enabling direct interfacing with legacy bipolar logic while maintaining low quiescent current (ICC ≤ 40 µA).
Each gate drives capacitive loads up to 50 pF with guaranteed switching performance across –55°C to +125°C, and output voltage levels are specified at IOH = –4 mA (VOH ≥ 3.7 V) and IOL = 4 mA (VOL ≤ 0.4 V) under 4.5 V supply - confirming robust noise margin and load-driving capability in mixed-logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Four independent 2-input OR gates; each implements Y = A + B in positive logic - enables discrete combinational logic without microcontroller intervention. |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V digital rails and tolerance against supply ripple or droop in industrial power domains. |
| Input Thresholds | VIL(max) = 0.8 V, VIH(min) = 2.0 V - guarantees reliable recognition of LSTTL-level signals (e.g., from 74LS series) without level-shifting circuitry. |
| Propagation Delay | 24–36 ns (CL = 50 pF, VCC = 4.5 V) - supports timing-critical functions such as enable signal consolidation in motor/fan controllers with sub-40 ns latency. |
| Operating Temperature | –55°C to +125°C - validated for deployment in automotive engine compartments, avionics subsystems, and downhole instrumentation where ambient extremes occur. |
| Output Drive | ±4 mA at VOH/VOL specs - sufficient to directly drive LED indicators, small MOSFET gates, or additional logic inputs without external buffers. |
| Quiescent Current | ICC ≤ 40 µA at TA = –55°C to +125°C - enables low-power always-on monitoring circuits in battery-backed or energy-constrained embedded systems. |
Pinout & Package
CD74HCT32M 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 (260°C reflow), and optimized for surface-mount assembly on high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 1B / 2A, 2B / 3A, 3B / 4A, 4B | Input (x4 pairs) | Dedicated inputs for each OR gate; must be tied to VCC or GND if unused to prevent floating states and undefined logic behavior. |
| 1Y, 2Y, 3Y, 4Y | Output (x4) | Active-high CMOS push-pull outputs capable of sourcing/sinking ±4 mA; tolerate capacitive loads ≤50 pF for full spec compliance. |
| GND (Pin 7) | Ground reference | Primary return path for all internal logic and output currents; requires low-impedance connection to system ground plane. |
| VCC (Pin 14) | Positive supply | 5 V nominal supply input; requires local 0.1 µF bypass capacitor placed adjacent to pin to suppress switching noise and ensure stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL- and CMOS-compatible inputs | VIH(min) = 2.0 V and VIL(max) = 0.8 V allow direct interface with both legacy 74LS and modern CMOS logic families without translation circuitry. |
| Wide temperature operation | Rated from –55°C to +125°C - eliminates need for derating or thermal shielding in extended-range applications like aerospace or industrial motor drives. |
| Buffered inputs | Reduces input capacitance loading on upstream drivers and improves noise immunity by isolating gate inputs from internal node coupling. |
| Low power vs LSTTL | ICC ≤ 40 µA versus typical 10–20 mA for equivalent 74LS32 - reduces board-level heat generation and extends battery life in portable instrumentation. |
| Fanout support | Drives up to 10 LSTTL loads per output - simplifies signal distribution in bus-enable or status-aggregation networks without buffer amplifiers. |
Applications
| Motor Control Enable Aggregation | Industrial Safety Interlock Monitoring |
|---|---|
|
Use Scenario: Four independent overtemperature sensors feed into separate OR gate inputs; output drives fan driver enable pin. IC Role / Device Role / Timing Role: Performs real-time 4-input OR function to generate single active-high enable signal - no software or MCU involvement required. Use Value: Enables immediate hardware-level response to any sensor fault, meeting SIL-2 functional safety requirements for fail-safe thermal shutdown. |
Use Scenario: Multiple emergency stop buttons (normally closed) wired as active-low inputs to OR gates. IC Role / Device Role / Timing Role: Converts OR logic of active-low signals into active-high system halt command for PLC or motion controller. Use Value: Provides deterministic <36 ns worst-case response time to E-stop events, eliminating firmware polling delays and ensuring compliance with ISO 13850. |
| Power Sequencing Coordination | Legacy System Signal Bridging |
|
Use Scenario: OR gate combines "power good" signals from three DC/DC converters to assert system-ready flag. IC Role / Device Role / Timing Role: Acts as hardware-based power-good combiner with rail-to-rail input compatibility across 4.5–5.5 V supplies. Use Value: Guarantees synchronized startup of downstream logic only after all rails stabilize - prevents latch-up or initialization faults in multi-rail SoC systems. |
Use Scenario: Interface between 74LS-series controller and modern 5 V CMOS peripheral requiring TTL-level inputs. IC Role / Device Role / Timing Role: Translates LSTTL output swings (0.4 V/2.4 V) to CMOS-compatible thresholds (0.8 V/2.0 V) with no external biasing. Use Value: Eliminates need for resistor-divider networks or dedicated level shifters, reducing BOM count and layout area in brownfield upgrades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input OR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT32DR | Same logic function, SOIC-14 package, identical VCC range and temperature rating; differs in tape-and-reel packaging (2500 pcs vs 2500 pcs) and marking ("HCT32DR" vs "HCT32M"). | Functionally interchangeable in all designs; pinout and timing match CD74HCT32M exactly - suitable for drop-in replacement where TI's second-source qualification is required. | Select SN74HCT32DR when dual-sourcing from TI's alternate manufacturing line is mandated by procurement policy or long-term supply assurance programs. |
| 74VHC32M | Higher speed (tpd ≈ 7.5 ns @ 5 V), wider VCC range (2–5.5 V), but reduced temperature range (–40°C to +85°C) and lower output drive (±8 mA vs ±4 mA). | Not suitable for military/automotive applications requiring –55°C operation; better suited for commercial-grade high-speed data paths where supply flexibility matters more than ruggedness. | Choose 74VHC32M only for cost-sensitive consumer electronics with benign thermal environments and need for faster propagation than CD74HCT32M provides. |
Compared with SN74HCT32DR, CD74HCT32M offers identical functionality and ruggedness but originates from TI's heritage HCT product line with broader military-grade validation history; versus 74VHC32M, CD74HCT32M trades speed for guaranteed –55°C operation and tighter input threshold control - making it the preferred choice for mission-critical infrastructure where reliability outweighs nanosecond-scale latency gains.
Availability
CD74HCT32M is available at Aetrix Electronics and suitable for industrial motor control, aerospace interlock systems, and automotive power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT32M 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 for industrial, automotive, and defense markets.
The CD74HCT32M belongs to TI's HCT (High-Speed CMOS TTL-compatible) logic family, designed specifically to replace legacy 74LS devices in systems demanding low power, wide temperature operation, and seamless interoperability with bipolar logic without redesign.
FAQ
What is the maximum capacitive load the CD74HCT32M can drive while maintaining full specification compliance?
The CD74HCT32M is characterized for CL = 50 pF in its switching specifications - propagation delay (tpd ≤ 36 ns) and transition time (tt ≤ 22 ns) are guaranteed only up to this load. Driving >50 pF may increase delay and cause marginal timing in high-speed systems; for larger loads, add a series resistor to limit output current per Section 6.1 absolute ratings. The CD74HCT32M datasheet explicitly recommends ≤50 pF for full spec compliance.
Can unused inputs on the CD74HCT32M be left floating, or must they be terminated?
Unused inputs on the CD74HCT32M must never be left floating - doing so risks undefined logic states, increased ICC, and potential oscillation due to noise coupling. Per TI's layout guidelines, all unused inputs must be tied to either VCC or GND using direct connections or 10-kΩ pull-up/pull-down resistors. This requirement is enforced by the device's TTL-compatible input structure and is documented in Section 9.2.1.2 of the CD74HCT32M datasheet.
Does the CD74HCT32M support operation at 3.3 V supply voltage?
No, the CD74HCT32M is not rated for 3.3 V operation. Its recommended operating conditions specify VCC = 4.5 V to 5.5 V only. Attempting to power the CD74HCT32M at 3.3 V will result in non-compliant VIH/VIL margins, degraded noise immunity, and possible failure to recognize valid logic levels - as confirmed by Section 6.2 of the official CD74HCT32M datasheet.
What is the thermal resistance (RθJA) of the CD74HCT32M in its SOIC-14 package?
The CD74HCT32M in SOIC-14 (D) package has a junction-to-ambient thermal resistance (RθJA) of 102.9°C/W, as measured under standard JEDEC test conditions. This value assumes a two-layer board with minimal copper; actual board-level RθJA will improve with internal ground/power planes and thermal vias. The parameter is listed in Table 6.3 of the CD74HCT32M datasheet and is critical for calculating junction temperature under worst-case power dissipation.
Is the CD74HCT32M pin-compatible with the older CD74LS32?
Yes, the CD74HCT32M is pin-compatible with CD74LS32 - both are 14-pin SOIC devices with identical pin assignments for inputs (1A–4B), outputs (1Y–4Y), VCC (Pin 14), and GND (Pin 7). However, the CD74HCT32M replaces bipolar LS technology with CMOS, delivering lower power, higher noise immunity, and extended temperature range while preserving drop-in mechanical and electrical compatibility in existing layouts.
CD74HCT32M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
CD74HCT32M FAQ
1.How can I place an order for CD74HCT32M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT32M 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 CD74HCT32M reliable?
The price and inventory of CD74HCT32M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT32M is usually 5 days.
3.What payment methods are accepted for CD74HCT32M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT32M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT32M?
CD74HCT32M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT32M 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 CD74HCT32M?
For technical support, including CD74HCT32M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT32M requirements.
6.How does Aetrix verify that CD74HCT32M is sourced from the original manufacturer or authorized distributors?
All CD74HCT32M 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 CD74HCT32M meets industry standards.
7.What is the process for return or replacement of CD74HCT32M?
All CD74HCT32M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT32M, 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 CD74HCT32M part is unused and in its original packaging.
Return procedure for CD74HCT32M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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