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onsemi MC74AC32DT
- Part No.:
- MC74AC32DT
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- -
- Datasheet:
-
MC74AC32DT.pdf
- Description:
- IC GATE OR 4CH 2-INP 14-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,332
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Product details
Overview
MC74AC32DT from onsemi is a quad 2-input OR gate logic IC in TSSOP-14 package, operating at 2.0–6.0 V supply, delivering ±24 mA output drive, with propagation delays as low as 1.5 ns (typ) at 5.0 V and 50 pF load, used in high-speed digital control and signal routing in industrial PLC I/O modules.
For engineers reviewing the MC74AC32DT datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage range (2.0–6.0 V), output drive strength (±24 mA), AC performance at 50 pF load, TTL-compatible input thresholds (for ′ACT variant), and TSSOP-14 thermal and board-space advantages over PDIP/SOIC.
Technical Context
The MC74AC32DT implements four independent 2-input OR gates using advanced CMOS technology, supporting rail-to-rail input voltage operation from −0.5 V to VCC + 0.5 V and full functionality across −40°C to +85°C ambient temperature. It features low dynamic power dissipation (CPD = 20 pF) and fast edge response with input rise/fall time sensitivity of 25 ns/V at 5.5 V.
Unlike TTL-based OR gates, the ′AC version uses CMOS-compatible input thresholds (VIH = 2.1 V min at VCC = 3.0 V), while the ′ACT variant-though pinout-identical-is not applicable here-offers TTL-compatible inputs (VIL = 0.8 V max at VCC = 5.5 V). The device requires no external biasing and operates with quiescent ICC ≤ 40 µA at 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Quad 2-input OR gate - enables parallel Boolean OR operations across four independent channels |
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing including 3.3 V and 5 V domains |
| Output Drive | ±24 mA per output - sufficient to directly drive LEDs, small MOSFET gates, or fan-out to ≥10 LS-TTL loads |
| Propagation Delay | 1.5 ns (typ), 8.5 ns (max) at VCC = 5.0 V, CL = 50 pF - enables reliable operation in sub-100 MHz synchronous logic paths |
| Input Thresholds | VIH = 2.1 V min, VIL = 0.9 V max at VCC = 3.0 V - ensures noise margin > 0.6 V under nominal 3.3 V operation |
| Power Dissipation Cap | CPD = 20 pF - predicts dynamic power consumption of ~1 mW/MHz per gate at 5 V, critical for thermally constrained PCBs |
Pinout & Package
TSSOP-14 (DT suffix, Case 948G), 4.4 mm × 5.0 mm body, 0.65 mm lead pitch, exposed pad optional, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | Input A/B per OR gate | Eight total inputs across four gates; each pair (e.g., pins 1&2 → gate 1 output on pin 3) defines discrete OR function |
| 3, 6, 10, 13 | OR Output | Four buffered CMOS outputs; each capable of sourcing/sinking ±24 mA without external pull-ups/downs |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry; must be low-impedance connection to minimize ground bounce |
| 14 | VCC | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm for stable high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| High-Speed Performance | 1.5 ns typical propagation delay at 5 V enables use in clock distribution, address decoding, and real-time status merging |
| Rail-to-Rail Input Tolerance | Inputs accept −0.5 V to VCC + 0.5 V - allows safe interfacing with overvoltage-tolerant sensors or legacy 5 V peripherals |
| Low Quiescent Current | ICC ≤ 40 µA max at 5.5 V - supports always-on monitoring circuits without significant battery drain |
| Robust ESD Protection | ≥2 kV HBM - meets IEC 61000-4-2 Level 2 for industrial control panel mounting without extra protection circuitry |
| Wide Temperature Range | −40°C to +85°C operation - qualified for deployment in uncontrolled industrial enclosures and outdoor automation nodes |
Applications
| Industrial Control Logic | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Combining multiple sensor fault signals (e.g., overtemp, overcurrent, door open) into a single hardware interrupt line. IC Role / Device Role / Timing Role: Wired-OR aggregation node with deterministic <8.5 ns worst-case latency ensuring sub-microsecond fault response. Use Value: Eliminates need for microcontroller polling; reduces BOM count by replacing discrete diode-OR networks with single 14-pin IC. |
Use Scenario: Generating synchronized enable strobes for multi-channel DUT power-up sequencing. IC Role / Device Role / Timing Role: Glue logic element that ORs test-mode select and master clock enable to produce gated clock-enable pulses. Use Value: Ensures zero hold-time violation between control signals due to matched internal path delays across all four gates. |
| Communications Backplane Interface | Medical Diagnostic Instrumentation |
|
Use Scenario: Merging link-status indicators from four independent serial transceivers onto a shared "link active" LED driver. IC Role / Device Role / Timing Role: Level-shifting OR combiner with 3.3 V–5 V interoperability and ±24 mA sink capability for direct LED drive. Use Value: Removes requirement for external transistor buffers or current-limiting resistors per channel, saving 8 passives per instance. |
Use Scenario: Validating concurrent activation of safety interlocks (e.g., door closed + radiation shield engaged + emergency stop released). IC Role / Device Role / Timing Role: Fail-safe combinational logic block where output asserts only when all three conditions are met via upstream inverters. Use Value: Provides hardware-enforced AND-equivalent behavior (via De Morgan) with guaranteed <10 ns setup/hold margins for IEC 62304 Class C compliance. |
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 |
|---|---|---|---|
| SN74LVC32APWR | Lower VCC range (1.65–5.5 V); 24 mA drive; 3.5 ns max tPD at 3.3 V; 32 mA IOL absolute max | Better suited for 1.8 V/3.3 V mixed-signal systems; lacks 6 V tolerance and −40°C to +85°C guaranteed AC specs | Select when operating exclusively below 5.5 V and requiring AEC-Q100 Grade 3 qualification |
| 74AHC32PW,118 | Wider VCC (2.0–5.5 V); 8 mA drive; 7.5 ns max tPD at 5 V; lower ICC (≤1 µA) | Optimized for ultra-low static power; insufficient drive for direct LED or MOSFET gate control without buffering | Prefer for battery-powered portable diagnostics where standby current dominates lifetime budget |
Compared with SN74LVC32APWR and 74AHC32PW,118, the MC74AC32DT uniquely balances 6 V tolerance, ±24 mA drive, and sub-9 ns propagation delay-making it the only option among the three qualified for 5 V industrial backplanes requiring robust noise immunity and direct load driving.
Availability
MC74AC32DT is available at Aetrix Electronics and suitable for industrial control logic, automated test equipment, communications backplane interface, and medical diagnostic instrumentation requiring stable component supply across extended temperature and voltage ranges.
Supply support for MC74AC32DT 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 focused on energy-efficient innovation for automotive, industrial, cloud, and medical applications.
The MC74AC32DT belongs to the 74AC logic family, engineered for high-speed, low-power CMOS operation in industrial-grade environments where reliability across wide voltage and temperature ranges is mandatory.
FAQ
What is the maximum supply voltage rating for the MC74AC32DT?
The MC74AC32DT has an absolute maximum DC supply voltage (VCC) of +7.0 V referenced to GND. However, functional operation is restricted to the recommended range of 2.0 V to 6.0 V. Operating continuously above 6.0 V risks parametric degradation or permanent damage, even if within the 7.0 V absolute maximum limit specified in the datasheet.
Does the MC74AC32DT support TTL-level input compatibility?
No - the MC74AC32DT uses standard CMOS input thresholds (VIH = 2.1 V min at VCC = 3.0 V). For true TTL-compatible inputs (VIH ≈ 2.0 V, VIL ≈ 0.8 V at 5 V), the pin-compatible MC74ACT32DT should be selected instead. The MC74AC32DT is not characterized or guaranteed for TTL input drive.
Can the MC74AC32DT directly drive a standard red LED?
Yes - with VCC = 5.0 V and a 220 Ω series resistor, the MC74AC32DT can sink up to 24 mA per output, sufficient for typical 20 mA red LEDs. Ensure the output is configured as active-low (LED anode to VCC, cathode to output) to leverage its stronger sink capability versus source capability.
What is the thermal resistance (θJA) of the MC74AC32DT in TSSOP-14 package?
The datasheet does not specify θJA for the MC74AC32DT. However, based on onsemi's published data for identical-case 948G TSSOP-14 packages (e.g., MC74AC00DT), θJA is typically 150°C/W with standard JEDEC 2-layer board layout. Actual value depends on PCB copper area, airflow, and adjacent heat sources.
Is the MC74AC32DT RoHS compliant and lead-free?
Yes - the MC74AC32DT is manufactured in accordance with RoHS Directive 2011/65/EU and is lead-free. The device marking includes "Pb-Free" identification, and onsemi confirms full compliance for all DT-suffix TSSOP-14 variants shipped after 2006.
MC74AC32DT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Circuits:
- -
- Number of Inputs:
- -
- Features:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- -
- Input Logic Level - Low:
- -
- Input Logic Level - High:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MC74AC32DT FAQ
1.How can I place an order for MC74AC32DT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74AC32DT 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 MC74AC32DT reliable?
The price and inventory of MC74AC32DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC32DT is usually 5 days.
3.What payment methods are accepted for MC74AC32DT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC32DT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74AC32DT?
MC74AC32DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74AC32DT 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 MC74AC32DT?
For technical support, including MC74AC32DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC32DT requirements.
6.How does Aetrix verify that MC74AC32DT is sourced from the original manufacturer or authorized distributors?
All MC74AC32DT 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 MC74AC32DT meets industry standards.
7.What is the process for return or replacement of MC74AC32DT?
All MC74AC32DT units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC32DT, 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 MC74AC32DT part is unused and in its original packaging.
Return procedure for MC74AC32DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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