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onsemi MC74ACT32D
- Part No.:
- MC74ACT32D
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC74ACT32D.pdf
- Description:
- IC GATE OR 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,681
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Product details
Overview
MC74ACT32D from onsemi is a quad 2-input OR gate in SOIC-14 package, featuring TTL-compatible inputs, ±24 mA output drive, 5.0 V nominal supply operation, propagation delay ≤10 ns (CL = 50 pF), and industrial temperature range (−40°C to +85°C). It serves as a logic-level combiner in digital control subsystems requiring robust noise immunity and fast signal routing.
For engineers reviewing the MC74ACT32D datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, package dimensions, functional role in combinational logic networks, and validated alternative options for board-level redesign or second-source procurement.
Technical Context
The MC74ACT32D implements four independent 2-input OR gates using high-performance silicon-gate CMOS technology. Each gate accepts TTL-level input thresholds (VIH = 2.0 V, VIL = 0.8 V at VCC = 4.5–5.5 V) and delivers rail-to-rail CMOS-compatible outputs with guaranteed VOH ≥ 4.4 V and VOL ≤ 0.44 V at ±24 mA load.
It operates within a strict 4.5 V to 5.5 V supply range and supports fast switching with tPLH/tPHL ≤ 10 ns (max) at 5.0 V and 50 pF load. Input capacitance is 4.5 pF and power dissipation capacitance is 20 pF - enabling predictable timing and low dynamic power in synchronous logic interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Quad 2-input OR gate - provides four independent Boolean OR operations per package |
| Supply Voltage Range | 4.5 V to 5.5 V - requires stable 5 V rail; not compatible with 3.3 V or mixed-voltage systems |
| Output Drive | ±24 mA - sufficient to directly drive LED indicators, small FET gates, or fan-out to ≥10 LS-TTL loads |
| Propagation Delay | ≤10 ns max (tPLH/tPHL, VCC = 5.0 V, CL = 50 pF) - enables use in sub-100 MHz clock-domain glue logic |
| Input Compatibility | TTL-compatible - accepts standard 0.8 V/2.0 V input thresholds, eliminating level-shifter need in legacy 5 V systems |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, instrumentation, and automotive under-hood auxiliary logic |
| ESD Rating | >2000 V HBM - withstands typical handling and board assembly without external protection |
Pinout & Package
MC74ACT32D is housed in a 14-lead SOIC (Small Outline Integrated Circuit) package, case 751A, with 1.27 mm pitch, body width 3.9 mm, and JEDEC-standard footprint. Pin 1 is marked by a notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 12, 13 | Input A/B of OR gates | Eight total inputs across four gates; each pair (e.g., pins 1&2 → gate 1 output on pin 3) forms one OR function |
| 3, 6, 10, 11 | OR Gate Outputs | Four independent outputs - no internal connection; each drives its own load without contention |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry; must be low-impedance return path |
| 14 | VCC | Positive supply terminal - bypass capacitor (0.1 µF ceramic) required adjacent to pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables direct interface with legacy 74LS/74F logic without level translation or pull-up resistors |
| 24 mA output sink/source | Supports direct driving of LEDs (with series resistor), small relays, or multiple downstream logic inputs |
| Pb-free / RoHS compliant | Meets global environmental compliance requirements for industrial and commercial PCB assembly |
| Low input capacitance (4.5 pF) | Minimizes loading on upstream drivers and preserves signal edge integrity in high-speed routing |
| Latch-up immunity >100 mA | Guarantees robustness against transient overvoltage or ground bounce in noisy industrial environments |
Applications
| Industrial PLC I/O Expansion | Legacy System Bus Arbitration |
|---|---|
Use Scenario: Adding discrete OR logic to merge multiple sensor fault signals into a single system-alert line in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Combinational logic gate aggregating up to four independent fault inputs (e.g., temperature, pressure, flow, voltage) into one active-high alert output. Use Value: Eliminates need for microcontroller polling or FPGA resources; provides deterministic, zero-latency fault aggregation with <10 ns propagation delay. |
Use Scenario: Resolving bus grant conflicts between multiple DMA controllers sharing a common data bus in retro-computing or test equipment designs. IC Role / Device Role / Timing Role: OR-ing individual bus request lines to generate a unified bus request signal fed to the central arbiter. Use Value: Enables priority-agnostic bus sharing with hardware-level speed - no firmware overhead or arbitration latency added. |
| 5 V Microcontroller Peripheral Interface | Power Sequencing Control Logic |
Use Scenario: Extending GPIO capability of an 8-bit MCU by OR-ing multiple status flags (e.g., watchdog timeout, memory error, comms fail) before triggering a hardware reset. IC Role / Device Role / Timing Role: Glue logic element converting parallel status bits into a single reset-enable signal synchronized to the MCU's reset domain. Use Value: Provides immediate, asynchronous reset assertion without software intervention - critical for fail-safe recovery. |
Use Scenario: Enabling power rails only after all upstream supplies meet regulation, using OR logic to combine "OK" signals from three independent DC/DC monitors. IC Role / Device Role / Timing Role: Active-high enable combiner ensuring downstream regulators activate only when all prerequisites are met. Use Value: Prevents partial-power-up faults; ensures deterministic sequencing with sub-10 ns response to any monitor failure. |
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 |
|---|---|---|---|
| SN74ACT32DR | Identical logic function, pinout, and DC/AC specs; TI-manufactured, same 4.5–5.5 V range and ±24 mA drive | No functional deviation - validated drop-in replacement in TI-qualified 5 V systems with identical thermal profile | Select when sourcing from TI-authorized channels or requiring TI-specific qualification documentation |
| 74VHC32M | Higher VCC range (2.0–5.5 V); lower drive (±8 mA); faster max speed (7.5 ns typ), but TTL input thresholds not supported | Requires input level-shifting in legacy TTL systems; suitable only where all upstream logic is CMOS-compatible | Choose for 3.3 V/5 V mixed-signal boards needing wider supply tolerance and lower static current (ICC < 2 µA) |
Compared with SN74ACT32DR and 74VHC32M, the MC74ACT32D uniquely guarantees TTL-compatible inputs without external biasing while maintaining full 5 V performance - making it irreplaceable in brownfield 5 V designs interfacing with older logic families.
Availability
MC74ACT32D is available at Aetrix Electronics and suitable for industrial control systems, legacy instrumentation upgrades, and 5 V embedded logic consolidation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MC74ACT32D 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 supplier specializing in energy-efficient power management, analog, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC74ACT32D belongs to onsemi's legacy 74ACT logic family - engineered specifically for high-speed, TTL-compatible 5 V digital systems where reliability, noise margin, and pin-for-pin compatibility with industry-standard OR gates are essential.
FAQ
What logic family does MC74ACT32D belong to, and how does it differ from standard 74AC devices?
The MC74ACT32D belongs to the 74ACT (Advanced CMOS TTL-compatible) family. Unlike standard 74AC devices, it features TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V at 5 V), enabling direct interfacing with 74LS and other bipolar logic without pull-ups or level shifters - a key distinction confirmed in the onsemi datasheet Section 4 DC Characteristics for 74ACT.
Is MC74ACT32D pin-compatible with MC74AC32D?
Yes, MC74ACT32D is pin-compatible with MC74AC32D - both share identical SOIC-14 pinout, logic function, and terminal assignments. However, MC74ACT32D uses TTL-compatible inputs while MC74AC32D uses CMOS-compatible inputs (VIH = 3.15 V at 4.5 V), so substitution requires verification of upstream driver compatibility.
What is the maximum operating frequency supported by MC74ACT32D in a real circuit?
MC74ACT32D does not specify a maximum clock frequency because it is a combinational logic device with no internal clock. Its usable toggle rate depends on propagation delay and load: with 50 pF load and 5 V supply, tPLH/tPHL ≤ 10 ns allows reliable operation up to ~50 MHz in feedback-free configurations - confirmed by AC Characteristics Table on page 4 of the datasheet.
Does MC74ACT32D support mixed-voltage operation, such as 3.3 V inputs with 5 V supply?
No, MC74ACT32D is not designed for mixed-voltage operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, and input voltage limits are referenced to VCC (VI ≤ VCC + 0.5 V). Applying 3.3 V inputs while powered at 5 V violates the absolute maximum rating for VI and risks latch-up or accelerated wear - per Maximum Ratings Table on page 2.
What package variants are available for MC74ACT32D, and which one is used in the D suffix?
The MC74ACT32D uses the SOIC-14 package (case 751A), as indicated by the "D" suffix per onsemi's ordering information table on page 5. Alternate variants include MC74ACT32DTR2G (TSSOP-14, "DT" suffix) and MC74ACT32DG (SOIC-14, rail-packaged). All share identical logic and electrical behavior - only mechanical form factor differs.
MC74ACT32D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- 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):
- 4 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 9ns @ 5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MC74ACT32D FAQ
1.How can I place an order for MC74ACT32D through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74ACT32D 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 MC74ACT32D reliable?
The price and inventory of MC74ACT32D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT32D is usually 5 days.
3.What payment methods are accepted for MC74ACT32D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT32D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74ACT32D?
MC74ACT32D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74ACT32D 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 MC74ACT32D?
For technical support, including MC74ACT32D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT32D requirements.
6.How does Aetrix verify that MC74ACT32D is sourced from the original manufacturer or authorized distributors?
All MC74ACT32D 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 MC74ACT32D meets industry standards.
7.What is the process for return or replacement of MC74ACT32D?
All MC74ACT32D units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT32D, 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 MC74ACT32D part is unused and in its original packaging.
Return procedure for MC74ACT32D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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