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onsemi MC74AC32MELG
- Part No.:
- MC74AC32MELG
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74AC32MELG.pdf
- Description:
- IC GATE OR 4CH 2-INP SOEIAJ-14
- Quantity:
- Payment:
- Shipping:
Inventory:4,173
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Product details
Overview
MC74AC32MELG from onsemi is a quad 2-input OR gate in high-performance silicon-gate CMOS technology, operating at 2.0–6.0 V supply voltage, delivering ±24 mA output drive, with propagation delay as low as 5.5 ns at 5.0 V and 50 pF load, used in digital logic interfacing and signal combining in industrial control and embedded systems.
For engineers reviewing the MC74AC32MELG datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage range (2.0–6.0 V), output drive capability (±24 mA), propagation delay (≤8.5 ns over temperature), input compatibility (CMOS-level), and Pb-free SOIC-14 packaging.
Technical Context
The MC74AC32MELG implements four independent OR logic functions using silicon-gate CMOS process, ensuring rail-to-rail output swing and low static current. It supports operation across −40°C to +85°C ambient temperature with guaranteed VIH/VIL thresholds at 2.1 V/0.9 V (VCC = 3.0 V) and 3.85 V/1.65 V (VCC = 5.5 V).
Input rise/fall time sensitivity is specified at 25 ns/V for VCC = 5.5 V, and dynamic output current capability reaches ±75 mA under transient conditions (VOLD ≤ 1.65 V, VOHD ≥ 3.85 V), enabling robust noise immunity and fanout support in mixed-signal environments.
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 | 2.0 V to 6.0 V - compatible with 3.3 V and 5 V logic systems without level translation |
| Output Drive | ±24 mA - supports direct driving of multiple TTL or CMOS inputs (fanout ≥ 10) |
| Propagation Delay | ≤8.5 ns at VCC = 5.0 V, CL = 50 pF - enables reliable timing in sub-100 MHz combinatorial paths |
| Input Thresholds | VIH = 2.1 V min @ VCC = 3.0 V; VIL = 0.9 V max - ensures clean switching with standard CMOS input levels |
| Quiescent ICC | ≤40 µA @ VCC = 5.5 V - minimizes standby power in battery-backed or low-power control circuits |
| ESD Rating | >2000 V HBM - provides robust handling integrity during board assembly and field service |
Pinout & Package
MC74AC32MELG is housed in a Pb-free SOIC-14 (Case 751A) package, 8.75 mm × 4.00 mm × 1.75 mm body size, with 1.27 mm pitch, designed for surface-mount reflow assembly and IPC-compliant PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 12, 13 | Input A/B per OR gate | Eight total inputs - two per gate (A and B), assigned to gates 1–4 respectively |
| 3, 6, 10, 11 | OR Output Y | Four independent outputs - Y1 (pin 3), Y2 (pin 6), Y3 (pin 10), Y4 (pin 11) |
| 7 | GND | Ground reference for all logic and power domains - must be low-impedance connection |
| 14 | VCC | Positive supply rail - decoupling capacitor (0.1 µF ceramic) required within 5 mm |
Key Features
| Feature | Design Value |
|---|---|
| CMOS-level input compatibility | Accepts full-rail input voltages (0–VCC) with defined VIH/VIL - eliminates need for external biasing |
| High-output current drive | ±24 mA sink/source capability - directly interfaces with legacy TTL loads or LED indicators |
| Low propagation delay variation | ΔtPLH/tPHL ≤ 1.5 ns over −40°C to +85°C - maintains timing margin in wide-temperature applications |
| Pb-free and RoHS-compliant construction | Meets EU RoHS Directive 2011/65/EU - qualified for lead-free reflow (260°C, 10 s) and long-term reliability |
| Dynamic output current rating | ±75 mA peak transient drive - sustains short-duration surge loads without latch-up |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Combining multiple sensor fault signals into a single OR'd alarm line for watchdog monitoring. IC Role / Device Role / Timing Role: Logic-level signal aggregation with deterministic propagation (<8.5 ns) to preserve fault-response timing budget. Use Value: Eliminates need for discrete diode-OR networks, reducing component count and improving noise immunity in noisy 12 V vehicle environments. | Use Scenario: Merging door-open, trunk-open, and hood-open status signals for centralized cabin alert generation. IC Role / Device Role / Timing Role: Low-power, rail-compatible OR function operating from 5 V regulated supply with guaranteed VIH/VIL across temperature. Use Value: Enables direct interface with microcontroller GPIOs without pull-up resistors or level shifters, simplifying BOM and layout. |
| Medical Equipment Status Monitoring | Test & Measurement Instrumentation |
Use Scenario: OR-ing multiple safety interlock inputs (e.g., cover open, overtemp, motion detected) before feeding to shutdown controller. IC Role / Device Role / Timing Role: Fail-safe logic element with >2000 V HBM ESD rating and latch-up immunity (>100 mA) for high-reliability medical use. Use Value: Meets IEC 60601-1 creepage/clearance requirements when used with proper PCB spacing, reducing system-level qualification effort. | Use Scenario: Generating composite trigger enable signals by OR-ing multiple event sources (e.g., timer expiry, external sync, manual start) in benchtop analyzers. IC Role / Device Role / Timing Role: High-speed combinatorial logic block with <10 ns delay and low skew between channels for precise timing alignment. Use Value: Maintains sub-10 ns timing correlation across four parallel trigger paths, critical for multi-channel synchronized acquisition. |
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 |
|---|---|---|---|
| SN74AC32DR | Same logic function and AC specs; TI part uses different internal layout and thermal resistance (JA = 120°C/W vs. onsemi's 116°C/W). | Identical pinout and DC specs; validated for industrial temp range but lacks explicit automotive qualification documentation. | Select when sourcing from TI-aligned supply chains or requiring TI-specific SPICE models and design tools. |
| 74VHC32M | Higher VCC max (7 V), lower ICC (≤2 µA), but slower max propagation (11 ns at 5 V); uses different process node. | Preferred for ultra-low-power battery-operated devices where speed <10 ns is not required. | Choose when minimizing quiescent current is prioritized over speed, and extended supply range (up to 7 V) is needed. |
Compared with SN74AC32DR and 74VHC32M, the MC74AC32MELG offers the lowest propagation delay (≤8.5 ns) and highest output drive (±24 mA) in its class while maintaining identical SOIC-14 footprint and CMOS input compatibility - making it optimal for timing-critical industrial and automotive signal conditioning.
Availability
MC74AC32MELG is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and medical device status monitoring requiring stable component supply and long-term lifecycle support.
Supply support for MC74AC32MELG 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 and sensing solutions for automotive, industrial, cloud, and medical markets.
The MC74AC32MELG belongs to onsemi's 74AC logic family, engineered for high-speed, low-power CMOS operation in harsh-environment applications where reliability, timing precision, and wide supply range are essential.
FAQ
What logic family does the MC74AC32MELG belong to, and how does it differ from 74ACT variants?
The MC74AC32MELG belongs to the 74AC (Advanced CMOS) logic family, optimized for CMOS-level input compatibility and operation from 2.0 V to 6.0 V. Unlike the 74ACT32 variant - which features TTL-compatible inputs (VIH = 2.0 V min at VCC = 4.5 V) - the MC74AC32MELG uses pure CMOS thresholds (VIH = 2.1 V min at VCC = 3.0 V). This makes the MC74AC32MELG ideal for mixed-voltage systems where input levels track VCC, while the ACT version suits legacy TTL interfacing. Both share identical pinout and output drive (±24 mA).
Does the MC74AC32MELG support operation at 3.3 V, and what are the key performance metrics at that voltage?
Yes, the MC74AC32MELG fully supports 3.3 V operation within its recommended range (2.0–6.0 V). At VCC = 3.3 V, typical propagation delay is 7.0 ns (tPLH/tPHL, CL = 50 pF), VIH is guaranteed ≥2.1 V, VIL ≤0.9 V, and output drive remains ±24 mA. Quiescent ICC stays ≤40 µA, and input capacitance is 4.5 pF - confirming robust performance in modern 3.3 V digital systems without level shifting.
What is the maximum allowable junction temperature and thermal resistance for the MC74AC32MELG in SOIC-14 package?
The MC74AC32MELG has a maximum junction temperature (TJ) rating of 150°C under bias and a thermal resistance JA of 116°C/W for the SOIC-14 (Case 751A) package. This means that at 25°C ambient and 50 mW power dissipation (typical worst-case), junction temperature rises by ~5.8°C - well within safe limits. Derating is required above 70°C ambient; full-rated operation is guaranteed from −40°C to +85°C ambient per datasheet specifications.
Is the MC74AC32MELG pin-compatible with other 74-series quad OR gates like the 74LS32 or 74HC32?
The MC74AC32MELG shares the same 14-pin SOIC footprint and identical pinout (per Figure 1) with 74LS32, 74HC32, and 74HCT32 - including VCC (pin 14), GND (pin 7), and OR gate I/O assignments. However, electrical compatibility requires verification: unlike 74LS32 (TTL), the MC74AC32MELG draws negligible input current and requires CMOS-level drive; unlike 74HC32, it offers higher drive (±24 mA vs. ±4 mA) and faster speed. Direct replacement is feasible only if system voltage and loading match AC/DC specs.
What packaging and compliance certifications apply to the MC74AC32MELG?
The MC74AC32MELG is supplied in a Pb-free SOIC-14 package (Case 751A, suffix 'D'), marked with 'G' indicating RoHS compliance and JESD22-A114A-certified ESD robustness (>2000 V HBM). It meets UL 94 V-0 flammability rating and is qualified per moisture sensitivity level (MSL) 1 - meaning unlimited floor life at ≤30°C/60% RH. No halogen-free or AEC-Q200 automotive qualification is claimed for this specific variant.
MC74AC32MELG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74AC
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- OR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 4 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.9V ~ 1.65V
- Input Logic Level - High:
- 2.1V ~ 3.85V
- Max Propagation Delay @ V, Max CL:
- 7.5ns @ 5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-14
MC74AC32MELG FAQ
1.How can I place an order for MC74AC32MELG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74AC32MELG 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 MC74AC32MELG reliable?
The price and inventory of MC74AC32MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC32MELG is usually 5 days.
3.What payment methods are accepted for MC74AC32MELG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC32MELG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74AC32MELG?
MC74AC32MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74AC32MELG 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 MC74AC32MELG?
For technical support, including MC74AC32MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC32MELG requirements.
6.How does Aetrix verify that MC74AC32MELG is sourced from the original manufacturer or authorized distributors?
All MC74AC32MELG 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 MC74AC32MELG meets industry standards.
7.What is the process for return or replacement of MC74AC32MELG?
All MC74AC32MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC32MELG, 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 MC74AC32MELG part is unused and in its original packaging.
Return procedure for MC74AC32MELG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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