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onsemi MC74HCT32ADG
- Part No.:
- MC74HCT32ADG
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC74HCT32ADG.pdf
- Description:
- IC GATE OR 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,138
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Product details
Overview
MC74HCT32ADG from onsemi is a quad 2-input OR gate IC with LSTTL-compatible inputs, designed for logic-level translation and signal combining in mixed-voltage digital systems. It operates from 2.0 V to 6.0 V, delivers ±25 mA output drive per pin, exhibits 15 ns propagation delay at 5.0 V, and supports industrial temperature range (–55 °C to +125 °C) in SOIC-14 package.
For engineers reviewing the MC74HCT32ADG datasheet, pinout, applications, or equivalent options, key selection criteria include its LSTTL-input compatibility, 10-LSTTL-load drive capability, guaranteed AC performance across temperature, Pb-free SOIC-14 packaging, and JEDEC Std. 7A compliance for legacy TTL interface designs.
Technical Context
The MC74HCT32ADG implements four independent OR logic functions (Y = A + B) using high-performance silicon-gate CMOS technology. Its input thresholds are optimized for direct interfacing with both standard CMOS and LSTTL outputs, enabling seamless integration into hybrid logic families without level-shifting circuitry.
Each gate features symmetrical propagation delays (tPLH/tPHL ≤ 22 ns at 125 °C, VCC = 5.0 V), low input leakage (±1.0 µA max), and robust noise immunity due to CMOS input structure. The device meets JEDEC Standard No. 7A for TTL-compatible logic levels and is rated for continuous operation up to 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Quad 2-input OR gate (Y = A + B), fully independent channels |
| Supply Voltage Range | 2.0 V to 6.0 V - enables interoperability across 3.3 V and 5 V logic domains |
| Propagation Delay | ≤22 ns at VCC = 5.0 V, TA = 125 °C - ensures timing predictability in high-temp industrial control |
| Output Drive | ±25 mA per pin - drives 10 LSTTL loads directly without buffering |
| Input Compatibility | LSTTL and CMOS - accepts 0.8 V/2.0 V VIH/VIL thresholds, eliminating external translators |
| Operating Temperature | –55 °C to +125 °C - qualified for under-hood automotive, motor control, and industrial PLC environments |
| ESD Protection | Integrated protection circuitry - guards against damage from high static voltages during handling and assembly |
Pinout & Package
MC74HCT32ADG is housed in a Pb-free SOIC-14 (Case 751A) package with 1.27 mm pitch, 8.55–8.75 mm body length, and 3.80–4.00 mm width. Pin 1 is marked by a notch or beveled corner; Pin 7 is GND, Pin 14 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | A1–A4 (Input) | First input of each OR gate - must be tied to defined logic level if unused |
| 2, 5, 10, 13 | B1–B4 (Input) | Second input of each OR gate - high noise immunity prevents false triggering |
| 3, 6, 8, 11 | Y1–Y4 (Output) | OR result per gate - capable of sourcing/sinking 25 mA for direct LED or buffer driving |
| 7 | GND | Ground reference for all inputs/outputs - requires low-impedance PCB connection |
| 14 | VCC | Positive supply rail - decoupling capacitor (0.1 µF) recommended adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL-compatible inputs | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V - eliminates need for external level shifters when interfacing with legacy TTL |
| High noise immunity | CMOS input structure with hysteresis-like threshold stability - reduces susceptibility to ground bounce and crosstalk in dense PCB layouts |
| Pb-free SOIC-14 package | RoHS-compliant, JEDEC-standard footprint - compatible with automated SMT reflow and legacy board designs using Case 751A |
| Low quiescent current | ICC ≤ 40 µA at TA = 125 °C - minimizes standby power in battery-backed or energy-sensitive applications |
| JEDEC Std. 7A compliance | Fully conforms to industry-standard TTL interface specifications - ensures interoperability with certified LSTTL components |
Applications
| Industrial Motor Control Logic | Automotive Body Controller |
|---|---|
Use Scenario: Combining fault signals from multiple motor drivers (overcurrent, overtemperature, stall) into a single OR'd "system fault" output. IC Role / Device Role / Timing Role: Logic-level aggregation node - performs real-time Boolean OR without introducing timing skew between channels. Use Value: Enables deterministic fault response within <22 ns at 125 °C, meeting IEC 61800-5-2 functional safety timing constraints. | Use Scenario: Merging door-open, seat-belt-unlatched, and ignition-on status signals to activate interior lighting control logic. IC Role / Device Role / Timing Role: Signal combiner in vehicle body domain controller - interfaces directly with 5 V LSTTL sensors and 3.3 V microcontroller GPIOs. Use Value: Eliminates discrete transistor logic or level-shifters, reducing BOM count and PCB area while maintaining automotive-grade temperature operation. |
| Legacy System Upgrade Interface | Programmable Logic Power-On Sequencer |
Use Scenario: Retrofitting modern microcontrollers into older equipment with LSTTL-based backplanes, requiring bidirectional voltage translation. IC Role / Device Role / Timing Role: Input translator and signal conditioner - accepts 5 V LSTTL outputs and presents clean CMOS-compatible inputs to MCU. Use Value: Preserves existing wiring harnesses and sensor modules while enabling migration to low-power 3.3 V controllers without redesigning interface layers. | Use Scenario: Generating enable signals for multiple power rails (VDDIO, VDDCORE, AVDD) based on sequenced reset and voltage-good feedback. IC Role / Device Role / Timing Role: Combinatorial logic element in power management state machine - ORs individual rail-ready flags into master "all-rails-up" assertion. Use Value: Provides sub-25 ns response to rail faults, ensuring fast system-level shutdown coordination without FPGA or CPLD overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT32DR | TI part with identical logic function, same 2–6 V supply range, but slightly higher max ICC (100 µA vs. 40 µA at 125 °C) | Same SOIC-14 footprint; validated for industrial temp but not explicitly rated to +125 °C in public datasheet | Select when TI supply chain preference applies and thermal margin allows for higher quiescent current |
| 74HCT32PW,118 | Nexperia TSSOP-14 variant - identical electrical specs but smaller 5.0 × 4.4 mm package with 0.65 mm pitch | Requires PCB layout change; better suited for space-constrained consumer electronics than industrial SOIC-replacement | Select when board area is critical and reflow profile supports fine-pitch TSSOP assembly |
Compared with SN74HCT32DR and 74HCT32PW,118, the MC74HCT32ADG offers superior high-temperature quiescent current performance and explicit +125 °C qualification - making it the preferred choice for thermally demanding industrial and automotive under-hood applications where long-term reliability is prioritized over footprint reduction or multi-source procurement.
Availability
MC74HCT32ADG is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, legacy system upgrades, and programmable power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74HCT32ADG 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and logic solutions for automotive, industrial, cloud, and IoT applications.
The MC74HCT32ADG belongs to the HCT logic family - engineered for TTL-to-CMOS interface bridging in mission-critical systems where reliability, wide voltage operation, and legacy compatibility are essential design requirements.
FAQ
What logic function does the MC74HCT32ADG implement?
The MC74HCT32ADG implements four independent 2-input OR gates (Y = A + B). Each gate operates identically and simultaneously, with no internal interdependence. This functionality is confirmed in the device's logic diagram (Figure 2), truth table, and functional description in the official onsemi datasheet. The MC74HCT32ADG is pin-compatible with the industry-standard LS32, enabling drop-in replacement in legacy designs.
Does the MC74HCT32ADG support 3.3 V logic systems?
Yes, the MC74HCT32ADG supports 3.3 V operation with full specification compliance: VIH = 2.0 V min and VIL = 0.8 V max at VCC = 3.3 V ensure reliable recognition of 3.3 V CMOS logic levels, while its 2.0–6.0 V supply range guarantees correct output swing. The MC74HCT32ADG is widely used to interface 3.3 V microcontrollers with 5 V peripherals without external level shifters.
What is the maximum operating temperature rating for the MC74HCT32ADG?
The MC74HCT32ADG is rated for continuous operation from –55 °C to +125 °C across all package types, including the SOIC-14 variant (MC74HCT32ADG). This rating is explicitly stated in the Recommended Operating Conditions table and verified through characterization per JEDEC JESD22-A108. The MC74HCT32ADG maintains guaranteed AC and DC performance throughout this full industrial temperature range.
Is the MC74HCT32ADG RoHS compliant and lead-free?
Yes, the MC74HCT32ADG is a Pb-free, RoHS-compliant device. The "G" suffix in the part number denotes Pb-free packaging, and the datasheet confirms compliance with JEDEC standards for lead-free manufacturing. The SOIC-14 package uses matte tin lead finish and meets IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) 1 requirements for unlimited floor life at ≤30 °C/60% RH.
Can unused inputs on the MC74HCT32ADG be left floating?
No, unused inputs on the MC74HCT32ADG must never be left floating. The datasheet explicitly states: "Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC)." Floating CMOS inputs cause increased supply current, unpredictable logic states, and potential device malfunction or accelerated wear-out. For the MC74HCT32ADG, tie unused A/B pins directly to VCC or GND using short PCB traces.
MC74HCT32ADG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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):
- 1 µA
- Current - Output High, Low:
- 4mA, 4mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 15ns @ 5V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MC74HCT32ADG FAQ
1.How can I place an order for MC74HCT32ADG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HCT32ADG 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 MC74HCT32ADG reliable?
The price and inventory of MC74HCT32ADG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HCT32ADG is usually 5 days.
3.What payment methods are accepted for MC74HCT32ADG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HCT32ADG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HCT32ADG?
MC74HCT32ADG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HCT32ADG 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 MC74HCT32ADG?
For technical support, including MC74HCT32ADG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HCT32ADG requirements.
6.How does Aetrix verify that MC74HCT32ADG is sourced from the original manufacturer or authorized distributors?
All MC74HCT32ADG 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 MC74HCT32ADG meets industry standards.
7.What is the process for return or replacement of MC74HCT32ADG?
All MC74HCT32ADG units undergo pre-shipment inspection (PSI). If there is an issue with MC74HCT32ADG, 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 MC74HCT32ADG part is unused and in its original packaging.
Return procedure for MC74HCT32ADG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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