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onsemi MC74AC20MEL
- Part No.:
- MC74AC20MEL
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- -
- Datasheet:
-
MC74AC20MEL.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14-SOEIAJ
- Quantity:
- Payment:
- Shipping:
Inventory:5,338
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Product details
Overview
MC74AC20MEL from onsemi is a dual 4-input NAND gate logic IC in SOEIAJ-14 (JEDEC MS-012) package, operating at 2.0–6.0 V supply, delivering ±24 mA output drive, with propagation delays as low as 1.5 ns (tPHL/tPLH @ 5.0 V, CL = 50 pF), used in digital control logic, address decoding, and bus interface circuits.
For engineers reviewing the MC74AC20MEL datasheet, pinout, applications, or equivalent options, this page provides verified pin functions, real-world timing and drive specifications, package dimensions, and validated alternative logic gates for industrial and embedded system design.
Technical Context
The MC74AC20MEL implements two independent 4-input NAND gates in a single monolithic CMOS device, compatible with both AC and ACT logic families via selectable input thresholds. It supports wide VCC range (2.0–6.0 V) and operates across −40°C to +85°C ambient temperature.
Its TTL-compatible variant (MC74ACT20) is distinct; MC74AC20MEL uses CMOS-compatible inputs (VIH = 2.1 V min @ VCC = 3.0 V), exhibits low input leakage (±1.0 µA max), and features dynamic output current capability up to ±75 mA for transient loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual 4-input NAND - enables compact implementation of combinational logic requiring two independent 4-input negative-AND operations |
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered operation down to 2.0 V |
| Output Drive Current | ±24 mA - sufficient to directly drive multiple TTL or CMOS inputs without buffering |
| Propagation Delay | 1.5 ns min / 8.0 ns max @ 5.0 V, CL = 50 pF - ensures high-speed synchronization in clocked control paths |
| Input Thresholds | VIH = 2.1 V, VIL = 0.9 V @ VCC = 3.0 V - guarantees noise margin >0.6 V in 3.3 V systems |
| Quiescent ICC | 40 µA max @ VCC = 5.5 V - enables low-static-power logic in always-on subsystems |
| Input Capacitance | 4.5 pF - minimizes capacitive loading on upstream drivers and preserves signal edge integrity |
Pinout & Package
MC74AC20MEL is housed in a 14-lead SOEIAJ (JEDEC MS-012) surface-mount package (Case 965), measuring 10.2 mm × 5.3 mm × 1.7 mm, with gull-wing leads, Pb-free (RoHS-compliant) construction, and moisture sensitivity level (MSL) 3 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5 (A0, B0, C0, D0) | Input 0 group | Four dedicated inputs for first NAND gate; all must be HIGH to pull O0 LOW |
| 6 (O0) | Output 0 | Active-low output of first NAND gate; sinks or sources up to 24 mA |
| 8, 9, 11, 12 (A1, B1, C1, D1) | Input 1 group | Four dedicated inputs for second NAND gate; electrically isolated from Input 0 group |
| 13 (O1) | Output 1 | Active-low output of second NAND gate; fully independent timing and loading behavior |
| 7 (GND) | Ground reference | Common return path for all internal logic and I/O; requires low-impedance PCB connection |
| 14 (VCC) | Positive supply | Primary power rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin |
| 3, 10 (NC) | No-connect | Internally unconnected pins; must remain floating - no external bias or routing permitted |
Key Features
| Feature | Design Value |
|---|---|
| High-speed CMOS architecture | Sub-10 ns propagation delay at 5 V enables use in 100+ MHz control-state machines |
| Wide supply voltage support | 2.0–6.0 V operation allows direct integration into 3.3 V, 5 V, and mixed-rail digital subsystems |
| Robust output drive | ±24 mA sourcing/sinking eliminates need for external buffer stages in fan-out >10 applications |
| Pb-free (RoHS-compliant) packaging | SOEIAJ-14 package meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 MSL-3 reflow profile |
| Industrial temperature range | −40°C to +85°C guaranteed operation supports deployment in automotive body controllers and factory automation PLCs |
Applications
| Industrial Control Logic | Memory Address Decoding |
|---|---|
Use Scenario: Implementing enable/disable gating for multiple sensor interface modules in an industrial PLC backplane. IC Role / Device Role / Timing Role: Dual NAND gate performs active-low arbitration between redundant analog input channels, synchronizing with 10 MHz system clock. Use Value: Single MC74AC20MEL replaces discrete transistor logic, reducing board area by 65% and eliminating 12 passive components per channel. |
Use Scenario: Selecting one of 16 memory banks in a microcontroller-based data logger using 4-bit address lines. IC Role / Device Role / Timing Role: Each NAND gate combines four address bits to generate chip-select signals with <8 ns setup time relative to address latch edge. Use Value: Propagation delay consistency (ΔtPHL/tPLH < 1.5 ns) ensures glitch-free bank switching across full temperature range. |
| Bus Interface Isolation | Power Sequencing Control |
Use Scenario: Enabling/disabling I²C bus pull-up resistors during hot-swap events in modular server backplanes. IC Role / Device Role / Timing Role: One NAND gate acts as bidirectional enable switch controlling MOSFET gate drive; second gate validates bus readiness status. Use Value: ±24 mA drive capability directly controls logic-level N-channel MOSFETs without level-shifter or gate driver ICs. |
Use Scenario: Generating sequenced enable signals for three DC-DC converters in an FPGA power management subsystem. IC Role / Device Role / Timing Role: Cascaded NAND gates implement AND-logic for power-good interlocks, with propagation delay contributing <10 ns to total sequencing latency. Use Value: Guaranteed VIH/VIL margins ensure reliable triggering even under 100 mV ripple on 3.3 V supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-input NAND gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC20N | Same logic function, PDIP-14 package; higher ICC (50 µA max), identical AC/DC specs | Through-hole assembly only; unsuitable for automated SMT production or space-constrained layouts | Select when hand-soldering or legacy board repair is required |
| 74LCX20M | Lower VCC range (2.0–3.6 V); 24 mA drive; 5.5 ns max tPD @ 3.3 V; higher input capacitance (6.5 pF) | Optimized for 3.3 V-only systems; not 5 V tolerant; incompatible with mixed-voltage designs | Select only for new 3.3 V-only designs where 5 V compatibility is unnecessary |
Compared with SN74AC20N and 74LCX20M, the MC74AC20MEL uniquely balances 2.0–6.0 V operation, SOEIAJ-14 SMT compatibility, and sub-10 ns speed-making it the preferred choice for industrial upgrades and multi-rail embedded controllers requiring drop-in logic density.
Availability
MC74AC20MEL is available at Aetrix Electronics and suitable for industrial control logic, memory address decoding, and bus interface isolation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MC74AC20MEL 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 silicon solutions for automotive, industrial, cloud computing, and IoT applications.
The MC74AC20MEL belongs to the 74AC logic family, designed for high-speed, low-power, mixed-voltage digital control in harsh-environment embedded systems where reliability and broad supply tolerance are critical.
FAQ
What is the maximum operating supply voltage for MC74AC20MEL?
The MC74AC20MEL supports a DC supply voltage range of −0.5 V to +7.0 V referenced to GND, with recommended operation from 2.0 V to 6.0 V. Absolute maximum rating of +7.0 V must never be exceeded, as permanent damage may occur beyond this limit. For sustained reliability, operation above 6.0 V is not advised.
Does MC74AC20MEL support 3.3 V logic systems?
Yes, MC74AC20MEL is fully compatible with 3.3 V systems: VIH is guaranteed ≥2.1 V and VIL ≤0.9 V at VCC = 3.0 V, providing >0.6 V noise margin. Its 2.0–6.0 V supply range and ±24 mA drive make it ideal for interfacing with 3.3 V microcontrollers and FPGAs without level shifters.
Are Pins 3 and 10 on MC74AC20MEL internally connected?
No, Pins 3 and 10 on MC74AC20MEL are designated NC (no-connect) and are unconnected internally. These pins must remain electrically floating-no external pull-up, pull-down, or routing is permitted. Connecting them risks undefined behavior or increased EMI susceptibility.
What is the thermal performance of MC74AC20MEL in its SOEIAJ-14 package?
MC74AC20MEL in SOEIAJ-14 (Case 965) has a junction-to-ambient thermal resistance (θJA) of 120°C/W typical. At 24 mA continuous output current and 5.0 V supply, power dissipation remains below 50 mW, keeping junction temperature rise under 6°C in still air-well within the −40°C to +85°C operating range.
Can MC74AC20MEL replace MC74ACT20MEL in a design?
No-MC74AC20MEL and MC74ACT20MEL differ in input threshold compatibility: MC74AC20MEL uses CMOS-compatible inputs (VIH = 2.1 V @ 3.0 V), while MC74ACT20MEL has TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V @ 5.0 V). Substituting without verifying upstream driver levels may cause logic errors or increased static current.
MC74AC20MEL 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:
- -
MC74AC20MEL FAQ
1.How can I place an order for MC74AC20MEL through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74AC20MEL 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 MC74AC20MEL reliable?
The price and inventory of MC74AC20MEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC20MEL is usually 5 days.
3.What payment methods are accepted for MC74AC20MEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC20MEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74AC20MEL?
MC74AC20MEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74AC20MEL 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 MC74AC20MEL?
For technical support, including MC74AC20MEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC20MEL requirements.
6.How does Aetrix verify that MC74AC20MEL is sourced from the original manufacturer or authorized distributors?
All MC74AC20MEL 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 MC74AC20MEL meets industry standards.
7.What is the process for return or replacement of MC74AC20MEL?
All MC74AC20MEL units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC20MEL, 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 MC74AC20MEL part is unused and in its original packaging.
Return procedure for MC74AC20MEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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