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onsemi MC74ACT20DG
- Part No.:
- MC74ACT20DG
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC74ACT20DG.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,662
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Product details
Overview
MC74ACT20DG from onsemi is a dual 4-input NAND gate in high-performance silicon-gate CMOS technology, featuring TTL-compatible inputs, 24 mA output drive capability, and operation over 4.5 V to 5.5 V supply range. It serves as a logic-level combinatorial gate in digital control, address decoding, and bus interface circuits within industrial and embedded systems.
For engineers reviewing the MC74ACT20DG datasheet, pinout, applications, or equivalent options, key selection criteria include input compatibility with TTL logic families, propagation delay under 10.5 ns at 5 V/50 pF, guaranteed operation from −40°C to +85°C, and Pb-free SOIC-14 packaging for surface-mount reliability.
Technical Context
The MC74ACT20DG implements two independent 4-input NAND gates in a single monolithic CMOS die, with inputs designed to meet TTL voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.5 V). Its outputs are fully buffered and capable of sourcing/sinking ±24 mA while maintaining VOH ≥ 4.4 V and VOL ≤ 0.44 V under load.
It operates strictly within the 4.5–5.5 V recommended supply range, with quiescent ICC ≤ 40 µA and dynamic output current capability up to ±75 mA (pulse-tested). Input capacitance is 4.5 pF and power dissipation capacitance is 40 pF at 5.0 V, supporting low-noise, high-speed switching in noise-sensitive digital subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual 4-input NAND gate - enables compact implementation of two independent Boolean NOT-AND operations per package |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and mixed-signal systems without level-shifting |
| Propagation Delay | Max 10.5 ns at 5 V/50 pF - supports reliable timing in 50 MHz+ synchronous logic designs |
| Output Drive | ±24 mA - directly interfaces with multiple LS-TTL loads or drives small LEDs without external buffers |
| Input Compatibility | TTL-compatible inputs - accepts standard 0.8 V/2.0 V logic thresholds, eliminating need for input conditioning circuitry |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade environmental robustness without derating |
| Package | SOIC-14 (Case 751A) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
MC74ACT20DG is housed in a 14-lead SOIC (Small Outline Integrated Circuit) package, case 751A, with 1.27 mm pitch, 8.55–8.75 mm body width, and Pb-free finish. Pin 1 is located at the top-left corner when viewing the top side with the marking notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A0 | First input of Gate 0 - one of four logic inputs to the first NAND gate |
| 2 | B0 | Second input of Gate 0 - contributes to 4-input NAND function O0 = NOT(A0·B0·C0·D0) |
| 3 | NC | No connection - internally unconnected; must remain floating or grounded per layout best practice |
| 4 | C0 | Third input of Gate 0 - part of full 4-input operand set for first gate |
| 5 | D0 | Fourth input of Gate 0 - completes input set for Gate 0 |
| 6 | O0 | Output of Gate 0 - active-low NAND result, capable of ±24 mA drive |
| 7 | GND | Ground reference - common return path for all internal circuitry and I/O |
| 8 | A1 | First input of Gate 1 - one of four logic inputs to second independent NAND gate |
| 9 | B1 | Second input of Gate 1 - contributes to O1 = NOT(A1·B1·C1·D1) |
| 10 | NC | No connection - internally unconnected; no electrical function |
| 11 | C1 | Third input of Gate 1 - part of 4-input operand set for second gate |
| 12 | D1 | Fourth input of Gate 1 - completes input set for Gate 1 |
| 13 | O1 | Output of Gate 1 - independent active-low NAND output, electrically isolated from O0 |
| 14 | VCC | Positive supply - powers both gates; must be decoupled locally with 0.1 µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts standard TTL logic thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at 5.5 V), enabling direct interfacing with legacy 74LS and microcontroller GPIOs without level shifters |
| 24 mA output drive | Sources/sinks ±24 mA per output, allowing direct fan-out to up to 10 LS-TTL loads or driving indicator LEDs with series resistors ≥ 150 Ω |
| Low propagation delay | Typical tPLH/tPHL = 6.5 ns at 5 V/50 pF, supporting reliable operation in high-speed address/data gating and clock enable paths |
| Pb-free SOIC-14 package | RoHS-compliant, JEDEC-standard SOIC-14 (Case 751A) footprint with 1.27 mm pitch, optimized for reflow soldering and automated optical inspection |
| Industrial temperature range | Guaranteed functionality from −40°C to +85°C ambient, suitable for deployment in programmable logic controllers and motor control I/O modules |
Applications
| Industrial Control Logic | Microcontroller Bus Interface |
|---|---|
|
Use Scenario: Address decoding in PLC backplane modules where multiple peripheral devices share a common data bus. IC Role / Device Role / Timing Role: Dual NAND gate performs active-low chip select generation by combining address bits A12–A15 with /CS and /RD signals. Use Value: Reduces discrete logic count by replacing four 2-input NANDs; maintains <10.5 ns setup/hold timing margins at 5 V. |
Use Scenario: Enabling/disabling peripheral communication on an 8-bit microcontroller expansion bus operating at 12 MHz. IC Role / Device Role / Timing Role: Acts as a gated bus driver control element, combining /WR, /RD, and address MSBs to qualify peripheral access windows. Use Value: Ensures clean, glitch-free enable strobes with TTL-compatible inputs matching MCU output thresholds and 24 mA drive for bus loading. |
| Digital Power Sequencing | Legacy System Glue Logic |
|
Use Scenario: Coordinating startup order of multiple DC-DC converters in telecom power shelves using discrete timing and status signals. IC Role / Device Role / Timing Role: Implements AND-NOT logic to generate delayed enable pulses based on upstream rail readiness and thermal fault flags. Use Value: Provides deterministic sequencing with sub-11 ns propagation and guaranteed operation across −40°C to +85°C ambient extremes. |
Use Scenario: Replacing obsolete 74F20 logic in avionics maintenance test equipment requiring long-term component availability. IC Role / Device Role / Timing Role: Performs identical dual 4-input NAND function as original part but with improved noise immunity and lower ICC. Use Value: Enables drop-in replacement in existing PCBs due to identical SOIC-14 pinout, TTL-compatible inputs, and matched AC/DC specs at 5 V. |
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 |
|---|---|---|---|
| SN74ACT20DR | Same logic function, TTL-compatible inputs, ±24 mA drive, but manufactured by Texas Instruments; propagation delay spec slightly looser (max 12 ns vs. 10.5 ns) | Valid for general-purpose 5 V logic design but not recommended for timing-critical paths requiring <11 ns budget | Select when TI supply chain alignment or dual-sourcing strategy is prioritized over marginal timing advantage |
| 74VHC20M | CMOS-only inputs (VIH = 3.5 V min at 5 V), lower ICC (<1 µA), but only ±8 mA output drive and no TTL compatibility | Requires input level translation when interfacing with TTL or older microcontrollers; unsuitable for direct LS-TTL fan-out | Prefer only in new low-power 5 V systems with purely CMOS signaling and no legacy interface requirements |
Compared with SN74ACT20DR and 74VHC20M, the MC74ACT20DG delivers tighter propagation delay control and verified TTL input compatibility-critical for retrofitting legacy systems-while maintaining industrial temperature rating and Pb-free compliance without design compromise.
Availability
MC74ACT20DG is available at Aetrix Electronics and suitable for industrial control logic, microcontroller bus interface, digital power sequencing, and legacy system glue logic requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for MC74ACT20DG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74ACT20DG belongs to onsemi's 74ACT logic family-designed specifically for 5 V systems demanding TTL compatibility, high-speed performance, and industrial-grade reliability without sacrificing CMOS power efficiency.
FAQ
What logic family does MC74ACT20DG belong to, and how does it differ from standard 74AC devices?
The MC74ACT20DG belongs to the 74ACT logic family, distinguished by TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at 5.5 V), unlike standard 74AC parts which require higher VIH (≥ 3.85 V). This allows MC74ACT20DG to interface directly with legacy TTL outputs and microcontroller GPIOs without level-shifting circuitry, while retaining CMOS output drive and low power consumption. The MC74ACT20DG also specifies tighter propagation delay limits than its 74AC counterpart.
Can MC74ACT20DG operate reliably at 3.3 V supply voltage?
No, MC74ACT20DG is not rated for 3.3 V operation. Its recommended supply range is strictly 4.5 V to 5.5 V, as confirmed in the Recommended Operating Conditions table. At 3.3 V, input thresholds would not be met (VIH min = 2.0 V requires ≥ 4.5 V for margin), and output drive capability degrades significantly. For 3.3 V systems, consider 74LVC20 or 74AUP20 devices instead - the MC74ACT20DG must be used only within its specified 5 V domain.
What is the meaning of "NC" pins (pins 3 and 10) on MC74ACT20DG, and how should they be handled on PCB layout?
Pins 3 and 10 on MC74ACT20DG are No-Connect (NC) terminals - physically present but internally unconnected to any circuit node. They must not be tied to VCC, GND, or signal nets. Best practice is to leave them floating or optionally connect to ground via a 0 Ω resistor for mechanical stability, provided no routing stubs or parasitic coupling is introduced. The official datasheet confirms these pins have no electrical function and no internal bond wire attachment.
Does MC74ACT20DG support hot-swap or live-insertion in backplane applications?
No, MC74ACT20DG is not designed for hot-swap operation. It lacks powered-off protection features such as Ioff (power-off isolation) or IOZ (high-impedance on power-down), and its absolute maximum ratings do not cover biased inputs during VCC ramp-up/down sequences. Applying input signals before VCC stabilization may cause latch-up or excessive current flow. For backplane applications requiring hot-swap, use dedicated hot-swap logic buffers or sequenced power architectures - MC74ACT20DG must be powered before signal assertion.
Is MC74ACT20DG pin-compatible with the obsolete 74F20 or 74LS20 logic devices?
Yes, MC74ACT20DG is pin-compatible with 74F20 and 74LS20 in the SOIC-14 package: both feature identical pin 1 location, dual 4-input NAND topology, and matching VCC (pin 14), GND (pin 7), and I/O assignments. However, MC74ACT20DG offers superior parameters - ±24 mA drive vs. ±20 mA (74F20) or ±8 mA (74LS20), lower ICC, and wider temperature range - making it a validated drop-in upgrade for legacy board replacements without layout changes.
MC74ACT20DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- NAND Gate
- Number of Circuits:
- 2
- Number of Inputs:
- 4
- Features:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 4 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 9ns @ 5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MC74ACT20DG FAQ
1.How can I place an order for MC74ACT20DG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74ACT20DG 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 MC74ACT20DG reliable?
The price and inventory of MC74ACT20DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT20DG is usually 5 days.
3.What payment methods are accepted for MC74ACT20DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT20DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74ACT20DG?
MC74ACT20DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74ACT20DG 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 MC74ACT20DG?
For technical support, including MC74ACT20DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT20DG requirements.
6.How does Aetrix verify that MC74ACT20DG is sourced from the original manufacturer or authorized distributors?
All MC74ACT20DG 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 MC74ACT20DG meets industry standards.
7.What is the process for return or replacement of MC74ACT20DG?
All MC74ACT20DG units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT20DG, 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 MC74ACT20DG part is unused and in its original packaging.
Return procedure for MC74ACT20DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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