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onsemi MC74AC20D
- Part No.:
- MC74AC20D
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC74AC20D.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,432
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Product details
Overview
MC74AC20D from onsemi is a dual 4-input NAND gate in high-performance silicon-gate CMOS technology, operating across 2.0–6.0 V supply range, delivering ±24 mA output drive, with propagation delays as low as 1.5 ns at 5.0 V and 50 pF load, used in digital logic control, address decoding, and bus interface circuits.
For engineers reviewing the MC74AC20D datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (SOIC-14), confirmed DC/AC electrical specs, functional pin roles, real-world use cases, and two validated alternative parts for logic-level compatibility assessment.
Technical Context
The MC74AC20D implements two independent 4-input NAND gates using CMOS transistor pairs with rail-to-rail input thresholds and buffered outputs. It supports wide VCC operation (2.0–6.0 V) without level-shifting circuitry and exhibits symmetric tPLH/tPHL propagation characteristics under defined load and temperature conditions.
Its input structure complies with standard CMOS voltage thresholds (VIH ≥ 2.1 V @ VCC = 3.0 V; VIL ≤ 0.9 V), and its output stage sustains ±24 mA drive while maintaining VOH ≥ 2.9 V and VOL ≤ 0.1 V at VCC = 3.0 V - enabling direct interfacing with TTL and other 3.3 V/5 V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 6.0 V - supports single-supply operation across 3.3 V and 5 V systems without external regulators |
| IOH/IOL | ±24 mA - sufficient to drive multiple standard TTL inputs or one 50 Ω transmission line |
| tPLH / tPHL | 1.5 ns (min) to 8.0 ns (max) @ 5.0 V, CL = 50 pF - enables sub-100 MHz combinational logic timing budgets |
| VIH / VIL | VIH = 2.1 V, VIL = 0.9 V @ VCC = 3.0 V - ensures noise margins > 0.6 V in 3.3 V logic domains |
| ICC (Quiescent) | 40 µA max @ VCC = 5.5 V - negligible static power draw in battery-backed or low-power hold states |
| CIN | 4.5 pF - minimizes capacitive loading on upstream drivers and preserves signal edge integrity |
Pinout & Package
MC74AC20D is housed in a Pb-free SOIC-14 package (Case 751A), measuring 8.55–8.75 mm × 3.80–4.00 mm × 1.35–1.75 mm, with 1.27 mm pitch, moisture sensitivity level 1, and lead finish matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5 | A0, B0, C0, D0 - Gate 0 Inputs | Four logic inputs for first NAND gate; all must be HIGH to assert LOW output O0 |
| 6 | O0 - Gate 0 Output | Inverted AND of A0–D0; drives downstream logic or pull-up networks |
| 8, 9, 11, 12 | A1, B1, C1, D1 - Gate 1 Inputs | Four logic inputs for second independent NAND gate |
| 10 | O1 - Gate 1 Output | Independent inverted AND output; electrically isolated from O0 |
| 7 | GND | Ground reference for all internal CMOS transistors and I/O buffers |
| 14 | VCC | Primary power supply rail; decoupling capacitor required within 1 cm |
| 3, 13 | NC | No internal connection; must remain unconnected per datasheet guidance |
Key Features
| Feature | Design Value |
|---|---|
| CMOS Input Compatibility | VIH/VIL thresholds track VCC proportionally - eliminates need for external level shifters in mixed-voltage designs |
| High Drive Strength | ±24 mA output capability allows fan-out of ≥10 LS-TTL loads or direct termination into 50 Ω lines |
| Low Propagation Delay | Typical 5.0 ns delay at 5 V enables use in fast address decode paths with <10 ns setup windows |
| Pb-Free Packaging | RoHS-compliant SOIC-14 with matte tin leads - qualified for reflow per J-STD-020, MSL Level 1 |
| Wide Temperature Range | Operates from −40°C to +85°C - suitable for industrial control and automotive under-hood auxiliary logic |
Applications
| Industrial PLC Logic Modules | Embedded Microcontroller Bus Decoding |
|---|---|
|
Use Scenario: Implementing enable/disable gating for peripheral select lines in programmable logic controllers with 24 V DC field I/O. IC Role / Device Role / Timing Role: Dual NAND gate provides synchronous enable logic for dual-channel analog input modules, reducing FPGA resource usage. Use Value: 2.0–6.0 V supply range matches industrial 5 V or 3.3 V backplane rails; ±24 mA drive directly interfaces with optocoupler input stages. |
Use Scenario: Generating chip-select signals for SPI flash and I²C EEPROM in ARM Cortex-M4-based edge sensor nodes. IC Role / Device Role / Timing Role: Combines address bits to generate precise memory-mapped peripheral enables with sub-10 ns timing margin. Use Value: 5.0 ns typical propagation delay ensures reliable CS assertion before microcontroller's access window closes. |
| Automotive Body Control Units | Test Equipment Digital Pattern Generation |
|
Use Scenario: Interlocking door lock/unlock command signals with ignition status and door ajar sensors in BCM firmware-offload logic. IC Role / Device Role / Timing Role: Implements safety-critical NAND-based interlock logic independent of main MCU, meeting ASIL-B functional requirements. Use Value: −40°C to +85°C operation and latch-up immunity (>100 mA) ensure robustness in under-dash environments. |
Use Scenario: Constructing custom state-machine trigger conditions in automated test fixtures for mixed-signal IC validation. IC Role / Device Role / Timing Role: Generates synchronized strobe pulses from parallel pattern generators by combining multiple timing flags. Use Value: Low input capacitance (4.5 pF) prevents signal degradation across 20+ cm PCB traces in high-speed test jigs. |
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 AC logic family, identical pinout, but PDIP-14 package; higher thermal resistance (JA = 150°C/W vs. 116°C/W) | Preferred for through-hole prototyping or legacy board upgrades where SOIC footprint unavailable | Select SN74AC20N only when manual soldering or socket-based validation is required; not recommended for high-density SMT production. |
| 74LVC20PW | Lower VCC range (1.65–5.5 V), higher speed (tPD = 3.2 ns typ), but only ±24 mA drive at VCC ≥ 4.5 V; different pinout (TSSOP-14) | Better suited for 1.8 V/3.3 V mixed-signal SoC interfaces requiring tighter timing closure | Choose 74LVC20PW when migrating to 3.3 V-only systems with strict timing budgets; verify NC pin locations differ (74LVC20PW has no NC pins). |
Compared with SN74AC20N and 74LVC20PW, MC74AC20D offers optimal balance of wide supply flexibility (2.0–6.0 V), industry-standard SOIC-14 packaging, and proven thermal performance - making it ideal for cost-sensitive, multi-rail industrial designs where layout reuse and long-term availability matter.
Availability
MC74AC20D is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, embedded microcontroller bus decoding, and automated test equipment requiring stable component supply across extended product lifecycles.
Supply support for MC74AC20D 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, analog, sensing, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The MC74AC20D belongs to the 74AC logic family - designed for high-speed, low-power CMOS applications demanding TTL-compatible drive strength and wide supply tolerance in space-constrained industrial and automotive control systems.
FAQ
What is the maximum supply voltage rating for MC74AC20D?
The MC74AC20D has an absolute maximum DC supply voltage (VCC) rating of +6.5 V, with recommended operating range from 2.0 V to 6.0 V. Operation above 6.5 V risks permanent damage per the datasheet's Maximum Ratings table; sustained use at 6.0 V is fully supported and commonly deployed in 5 V industrial systems where marginal overvoltage may occur during transient events.
Does MC74AC20D support 3.3 V logic levels?
Yes, MC74AC20D fully supports 3.3 V operation: VIH is guaranteed ≥2.1 V and VIL ≤0.9 V at VCC = 3.0 V, providing >0.6 V noise margin. Its ±24 mA drive strength and 5.0 ns typical propagation delay at 3.3 V make MC74AC20D suitable for interfacing with 3.3 V microcontrollers, FPGAs, and peripheral ICs without level translation.
Are pins 3 and 13 on MC74AC20D internally connected?
No - pins 3 and 13 on MC74AC20D are explicitly designated as NC (No Connection) in the official onsemi datasheet. They have no internal bond wire or silicon connection and must remain unconnected on the PCB; routing traces or placing vias to these pins may cause unintended coupling or violate layout guidelines.
What is the thermal resistance (θJA) of MC74AC20D in its SOIC-14 package?
The junction-to-ambient thermal resistance (θJA) of MC74AC20D in the SOIC-14 package (Case 751A) is 116°C/W, measured per JESD51-7. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias, enabling continuous operation up to 85°C ambient with typical logic switching activity.
How does MC74AC20D differ from MC74ACT20D?
MC74AC20D features standard CMOS input thresholds, while MC74ACT20D has TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V at VCC = 5.5 V). Both share identical pinout, output drive (±24 mA), and propagation delay specs, but MC74ACT20D is intended for legacy 5 V TTL system integration, whereas MC74AC20D targets modern mixed-voltage CMOS designs with scalable supply operation down to 2.0 V.
MC74AC20D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74AC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MC74AC20D FAQ
1.How can I place an order for MC74AC20D through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74AC20D 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 MC74AC20D reliable?
The price and inventory of MC74AC20D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC20D is usually 5 days.
3.What payment methods are accepted for MC74AC20D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC20D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74AC20D?
MC74AC20D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74AC20D 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 MC74AC20D?
For technical support, including MC74AC20D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC20D requirements.
6.How does Aetrix verify that MC74AC20D is sourced from the original manufacturer or authorized distributors?
All MC74AC20D 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 MC74AC20D meets industry standards.
7.What is the process for return or replacement of MC74AC20D?
All MC74AC20D units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC20D, 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 MC74AC20D part is unused and in its original packaging.
Return procedure for MC74AC20D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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