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onsemi MC74AC20NG
- Part No.:
- MC74AC20NG
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
MC74AC20NG.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,094
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Product details
Overview
MC74AC20NG from onsemi is a dual 4-input NAND gate in high-performance silicon-gate CMOS technology, operating at supply voltages from 2.0 V to 6.0 V, delivering ±24 mA output drive, with propagation delays as low as 1.5 ns (tPHL/tPLH) at 5.0 V and CL = 50 pF, used in digital logic control, address decoding, and bus interface circuits.
For engineers reviewing the MC74AC20NG datasheet, pinout, applications, or equivalent options, key selection considerations include its 14-lead SOIC package, TTL-compatible input thresholds only in ACT variants (not AC), guaranteed operation from −40°C to +85°C, and compliance with Pb-free RoHS requirements per marking "G".
Technical Context
The MC74AC20NG implements two independent 4-input NAND gates in a single monolithic CMOS IC, with inputs fully compatible with CMOS and LSTTL logic levels (VIH = 2.1 V min at VCC = 3.0 V; VIL = 0.9 V max). It features no internal pull-ups or Schmitt-trigger inputs, and all inputs tolerate overvoltage up to VCC + 0.5 V per absolute maximum ratings.
Its DC performance includes VOH ≥ 2.9 V (at VCC = 3.0 V, IOH = −24 mA) and VOL ≤ 0.44 V (at VCC = 5.5 V, IOL = 24 mA), with quiescent ICC ≤ 40 µA at VCC = 5.5 V and TA = −40°C to +85°C. Input capacitance is 4.5 pF, and power dissipation capacitance is 40 pF at 5.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual independent 4-input NAND gates - enables compact implementation of combinational logic requiring two separate 4-input negative-AND operations |
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing including 3.3 V and 5 V domains without level shifters |
| Output Drive | ±24 mA - sufficient to directly drive multiple LSTTL loads (fan-out ≥ 10) or small capacitive buses |
| Propagation Delay | 1.0–10.5 ns (VCC = 5.0 V, CL = 50 pF) - ensures timing-critical path compatibility in sub-10 ns logic families |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications |
| Input Capacitance | 4.5 pF - minimizes loading on preceding stage and preserves signal edge integrity in high-speed routing |
| Pb-Free Compliance | RoHS-compliant SOIC-14 package marked "G" - meets environmental compliance requirements for global manufacturing |
Pinout & Package
MC74AC20NG is housed in a 14-lead SOIC package (Case 751A, 3.9 mm width), with standard pin spacing (1.27 mm pitch) and JEDEC-compliant footprint. The package is moisture sensitivity level (MSL) 1 and rated UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 9, 10, 12, 13 | Inputs (A0–D0, A1–D1) | Eight logic inputs grouped into two sets of four - each set feeds one NAND gate; no internal connection between groups |
| 3, 6 | No Connect (NC) | Unbonded pins - must remain unconnected; not internally tied to VCC, GND, or any node |
| 7, 8 | Outputs (O0, O1) | Two active-low open-drain–capable CMOS outputs - can be wire-OR'd with external pull-up if needed |
| 14 | VCC | Positive supply terminal - must be decoupled locally with 0.1 µF ceramic capacitor near pin |
| 7 | GND | Ground reference - shared return for both gates; requires low-impedance PCB plane connection |
Key Features
| Feature | Design Value |
|---|---|
| High-Speed CMOS Architecture | Delivers 1.5 ns typical tPHL at 5 V - reduces combinatorial delay in synchronous state machines and address decoders |
| Wide Supply Range Support | Operates reliably from 2.0 V to 6.0 V - allows direct integration into battery-powered (3.3 V) and legacy 5 V systems |
| Robust Output Drive | Sinks and sources ±24 mA - eliminates need for external buffer stages when driving LEDs, relays, or multiple logic inputs |
| Low Input Leakage | IIN ≤ ±1.0 µA at VCC = 5.5 V - prevents unintended logic transitions in high-impedance or battery-critical nodes |
| ESD Protection | Human Body Model > 2000 V - enhances handling robustness during manual assembly and board-level test |
Applications
| Industrial PLC Logic Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Implementing multi-sensor enable logic where four door switch inputs must all be active to unlock trunk latch. IC Role / Device Role / Timing Role: Dual 4-input NAND performs AND-NOT logic for safety interlock verification before actuator enable. Use Value: Single MC74AC20NG replaces discrete transistor-resistor networks, reducing BOM count and improving timing consistency across temperature. | Use Scenario: Generating headlight high-beam inhibit signal when fog lamp and parking light status are simultaneously asserted. IC Role / Device Role / Timing Role: One NAND gate computes logical condition; second gate buffers output to drive LED indicator driver stage. Use Value: Guaranteed −40°C to +85°C operation ensures reliable function in under-hood environments without derating. |
| Medical Infusion Pump Control | Test Equipment Signal Conditioning |
Use Scenario: Validating simultaneous presence of motor enable, occlusion sensor clear, and door closed signals before pump activation. IC Role / Device Role / Timing Role: First NAND gate validates safety preconditions; second provides isolated logic-level output to microcontroller interrupt input. Use Value: Low input leakage (<1 µA) prevents false triggering in low-power sleep modes, extending battery life. | Use Scenario: Converting asynchronous trigger pulses from multiple instruments into synchronized strobe signals for digitizer sampling windows. IC Role / Device Role / Timing Role: Two NAND gates form edge-detecting logic to generate precise narrow-width strobes from rising/falling edges. Use Value: Sub-10 ns propagation delay tolerance enables sub-100 MHz timing alignment across instrument channels. |
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 and AC electrical specs; differs in packaging (PDIP-14 vs SOIC-14) and thermal resistance (JA = 70°C/W vs 116°C/W) | Preferred for through-hole prototyping or legacy board rework; unsuitable for surface-mount volume production | Select SN74AC20N only when PDIP mounting is required; MC74AC20NG offers superior thermal performance in dense layouts. |
| 74LVC20PW | Lower VCC range (1.65–5.5 V); higher speed (tPD = 3.2 ns typ at 3.3 V); different input thresholds (VIH = 2.0 V min at VCC = 3.3 V) | Better suited for 3.3 V-only systems with tighter timing budgets; not drop-in compatible due to differing VIH/VIL at 5 V | Choose 74LVC20PW for new 3.3 V designs needing faster switching; retain MC74AC20NG for 5 V legacy compatibility or mixed-voltage interfaces. |
Compared with SN74AC20N and 74LVC20PW, the MC74AC20NG uniquely balances wide voltage operation (2.0–6.0 V), industrial temperature range, and SOIC-14 surface-mount compatibility-making it optimal for cost-sensitive, thermally constrained, and voltage-flexible industrial control designs.
Availability
MC74AC20NG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical device logic subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC74AC20NG 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 MC74AC20NG belongs to the 74AC logic family, designed for high-speed, low-power CMOS applications requiring robust noise immunity, wide supply tolerance, and direct compatibility with legacy TTL and modern CMOS systems.
FAQ
What logic family does the MC74AC20NG belong to, and how does it differ from the MC74ACT20?
The MC74AC20NG belongs to the 74AC (Advanced CMOS) logic family. Unlike the MC74ACT20, which features TTL-compatible input thresholds (VIH = 2.0 V min at VCC = 4.5 V), the MC74AC20NG uses pure CMOS input thresholds (VIH = 2.1 V min at VCC = 3.0 V). This makes the MC74AC20NG better suited for mixed-voltage systems where input levels follow CMOS ratios, while the ACT variant is optimized for direct interfacing with legacy TTL outputs. Both share identical pinout, package, and output drive capability.
Can the MC74AC20NG operate reliably at 3.3 V, and what are its key timing parameters at that voltage?
Yes, the MC74AC20NG is fully specified for operation at 3.3 V (within its 2.0–6.0 V range). At VCC = 3.3 V and CL = 50 pF, typical propagation delay is tPLH = 6.0 ns and tPHL = 5.0 ns, with guaranteed maximums of 8.5 ns and 7.0 ns respectively. Input thresholds are VIH = 1.5 V min and VIL = 0.9 V max, ensuring solid noise margins in 3.3 V systems. The MC74AC20NG maintains full −40°C to +85°C operation at this voltage.
Are pins 3 and 6 on the MC74AC20NG internally connected, and how should they be handled on the PCB?
No, pins 3 and 6 on the MC74AC20NG are No Connect (NC) terminals - they are physically present but unbonded inside the die and electrically floating. These pins must remain unconnected on the PCB; neither tying them to VCC nor GND is permitted. Routing traces or placing vias on these pads is acceptable, but solder mask should fully cover them to prevent accidental shorts. Their presence accommodates die bonding flexibility in the SOIC-14 package.
Does the MC74AC20NG support hot insertion or live insertion into a powered backplane?
No, the MC74AC20NG is not designed for hot insertion. Its absolute maximum ratings specify that VI must remain within −0.5 V to VCC + 0.5 V, and exceeding these limits - as occurs during hot plug events - risks latch-up or permanent damage. The device lacks bus-hold, Ioff, or power-off protection circuitry. For backplane applications requiring live insertion, a dedicated hot-swap controller or isolation logic buffer must precede the MC74AC20NG.
How does the MC74AC20NG's ESD rating compare to industry standards, and what handling precautions are recommended?
The MC74AC20NG is rated for >2000 V HBM (Human Body Model) and >1000 V CDM (Charged Device Model), meeting or exceeding JEDEC JS-001 and JS-002 requirements for general-purpose logic devices. While robust, it still requires standard ESD controls: use grounded wrist straps, dissipative mats, and ionized air during handling; avoid contact with pins using bare fingers; and store in static-shielding bags. These precautions ensure reliability in automated SMT lines and manual assembly of sensitive medical or automotive boards.
MC74AC20NG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74AC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- NAND Gate
- Number of Circuits:
- 2
- Number of Inputs:
- 4
- 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:
- 7ns @ 5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
MC74AC20NG FAQ
1.How can I place an order for MC74AC20NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74AC20NG 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 MC74AC20NG reliable?
The price and inventory of MC74AC20NG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC20NG is usually 5 days.
3.What payment methods are accepted for MC74AC20NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC20NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74AC20NG?
MC74AC20NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74AC20NG 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 MC74AC20NG?
For technical support, including MC74AC20NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC20NG requirements.
6.How does Aetrix verify that MC74AC20NG is sourced from the original manufacturer or authorized distributors?
All MC74AC20NG 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 MC74AC20NG meets industry standards.
7.What is the process for return or replacement of MC74AC20NG?
All MC74AC20NG units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC20NG, 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 MC74AC20NG part is unused and in its original packaging.
Return procedure for MC74AC20NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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