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onsemi MC74ACT20NG
- Part No.:
- MC74ACT20NG
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
MC74ACT20NG.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,954
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Product details
Overview
MC74ACT20NG from onsemi is a dual 4-input NAND gate in high-performance silicon-gate CMOS technology, designed for TTL-compatible logic interfacing. It operates at 4.5 V to 5.5 V supply, delivers ±24 mA output drive, exhibits 6.5 ns typical propagation delay at 5 V/50 pF, and supports industrial temperature range (−40°C to +85°C). It is used in digital control logic, address decoding, and bus interface circuits where robust noise immunity and fast switching are required.
For engineers reviewing the MC74ACT20NG datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, validated SOIC-14 pin mapping, confirmed DC/AC electrical specifications, real-world use scenarios, and two technically documented alternative parts with explicit interface and voltage-level differences.
Technical Context
The MC74ACT20NG implements two independent 4-input NAND gates using advanced CMOS process technology. Each gate accepts four logic inputs (A₀–D₀ and A₁–D₁) and produces one complementary output (O₀ and O₁), with no internal feedback or enable logic - pure combinational logic operation.
Its TTL-compatible inputs accept VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V, enabling direct interfacing with legacy 5 V TTL families. Output VOH ≥ 4.4 V and VOL ≤ 0.44 V at IOL = 24 mA / IOH = −24 mA ensure reliable signal integrity across loaded PCB traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual independent 4-input NAND gate - enables compact implementation of multi-input logic without external gating. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL and CMOS systems; not rated for 3.3 V operation. |
| Propagation Delay | 6.5 ns typical (tPLH/tPHL, VCC = 5.0 V, CL = 50 pF) - supports >100 MHz toggle rates in short-path logic designs. |
| Output Drive | ±24 mA (IOH/IOL) - sufficient to directly drive multiple 74-series TTL inputs or LED indicators without buffers. |
| Input Compatibility | TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - eliminates need for level-shifting when interfacing with 74LS/74F devices. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications. |
| Package | SOIC-14 (Case 751A) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns. |
Pinout & Package
MC74ACT20NG is housed in a 14-lead SOIC package (Case 751A), measuring 8.75 mm × 3.90 mm × 1.75 mm (max height), with 1.27 mm pitch and Pb-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A₀ | First NAND gate input A - active-high logic input; referenced to GND/VCC rails. |
| 2 | B₀ | First NAND gate input B - identical electrical behavior to A₀; no internal differentiation. |
| 3 | NC | No connection - internally unconnected; must remain floating or tied to GND per layout best practice. |
| 4 | C₀ | First NAND gate input C - electrically identical to A₀/B₀; all four inputs fully interchangeable. |
| 5 | D₀ | First NAND gate input D - completes 4-input NAND function for output O₀ (pin 6). |
| 6 | O₀ | First NAND gate output - low when all A₀–D₀ are high; open-circuit CMOS totem-pole structure. |
| 7 | GND | Ground reference - mandatory 0 V return path for all internal logic and I/O current sinks. |
| 8 | A₁ | Second NAND gate input A - independent of first gate; shares no internal nodes with A₀–D₀. |
| 9 | B₁ | Second NAND gate input B - identical timing and drive specs as A₀–D₀ inputs. |
| 10 | NC | No connection - same isolation and handling requirements as pin 3. |
| 11 | C₁ | Second NAND gate input C - completes second 4-input NAND group with A₁, B₁, D₁. |
| 12 | D₁ | Second NAND gate input D - final input for O₁ (pin 13); no internal fanout limitation. |
| 13 | O₁ | Second NAND gate output - complements O₀ in function; electrically isolated and independently loaded. |
| 14 | VCC | Positive supply rail - must be decoupled locally (0.1 µF ceramic) within 5 mm of pin for stable AC performance. |
Key Features
| Feature | Design Value |
|---|---|
| ±24 mA output drive capability | Enables direct driving of up to 10 standard TTL inputs or discrete LEDs without external buffers. |
| TTL-compatible input thresholds | Accepts 5 V TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) without level shifters or pull-ups. |
| Low propagation delay (6.5 ns typ) | Supports high-speed address decoding and synchronous control paths in microcontroller peripherals. |
| Pb-free SOIC-14 package | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity Level 1. |
| Industrial temperature rating | Guaranteed functionality from −40°C to +85°C ambient - suitable for factory automation and outdoor electronics. |
Applications
| Microcontroller Address Decoding | Industrial Bus Interface Logic |
|---|---|
|
Use Scenario: Generating chip-select signals for peripheral ICs (e.g., ADCs, DACs, EEPROMs) based on upper address bits from an 8-bit MCU. IC Role / Device Role / Timing Role: Combinational logic decoder - converts parallel address lines into active-low enable pulses with sub-10 ns setup/hold margin. Use Value: Eliminates need for larger PLD or FPGA resources; reduces BOM count while maintaining deterministic timing. |
Use Scenario: Conditioning control signals between a PLC CPU module and field I/O cards operating under noisy factory EMI conditions. IC Role / Device Role / Timing Role: Noise-immune logic gate - rejects transients < 2 ns due to fast edge rate and Schmitt-free hysteresis-free design. Use Value: Prevents spurious toggling of relay drivers or analog muxes during motor switching events. |
| Legacy System Logic Retrofit | LED Status Indicator Driver |
|
Use Scenario: Replacing obsolete 74F20 or 74LS20 dual NAND packages in aging test equipment without board redesign. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement - matches 14-pin SOIC footprint and truth table exactly. Use Value: Extends product lifecycle without requalification; maintains original timing margins and loading behavior. |
Use Scenario: Driving 8-segment LED displays or multi-color status indicators in medical diagnostic panels requiring visual feedback. IC Role / Device Role / Timing Role: Current-sourcing logic buffer - sinks 24 mA per output to illuminate common-anode LEDs directly. Use Value: Reduces component count by eliminating discrete transistor drivers and associated base resistors. |
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 | Identical logic function, pinout, and DC specs; TI version uses different process but meets same AC timing (tPLH/tPHL ≤ 10.5 ns). | Same industrial temp range and SOIC-14 package; differs only in manufacturer-specific ESD structure and minor ICC variation. | Select when sourcing from TI-authorized channels or requiring TI-specific qualification documentation. |
| 74VHC20M | Higher VIH (3.15 V min @ 4.5 V) and lower IOL (8 mA) - not TTL-compatible; requires 3.3 V or 5 V CMOS-level inputs. | Not suitable for direct 74LS/74F interface; limited to pure CMOS systems; better for ultra-low power (< 2 µA ICC). | Choose only if system uses exclusively CMOS logic and power budget is constrained below 100 µW per gate. |
Compared with SN74ACT20DR and 74VHC20M, the MC74ACT20NG uniquely guarantees TTL-compatible inputs and ±24 mA drive at full industrial temperature range - making it the preferred choice for mixed-logic retrofits and noise-prone environments where signal integrity is non-negotiable.
Availability
MC74ACT20NG is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment repair, and embedded microcontroller peripheral interfacing requiring stable component supply and long-term manufacturability.
Supply support for MC74ACT20NG 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 sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC74ACT20NG belongs to onsemi's 74ACT logic family - engineered for high-speed, TTL-compatible interoperability in industrial and communications equipment where reliability across temperature and voltage extremes is critical.
FAQ
What logic family does the MC74ACT20NG belong to, and how does it differ from the MC74AC20NG?
The MC74ACT20NG belongs to the 74ACT (Advanced CMOS TTL-compatible) family. Unlike the MC74AC20NG, which has CMOS-only inputs (VIH ≥ 3.15 V @ 4.5 V), the MC74ACT20NG features TTL-compatible inputs (VIH ≥ 2.0 V), enabling direct interface with legacy 74LS and 74F devices without level shifting. Both share identical pinout and SOIC-14 packaging, but MC74ACT20NG is specified only for 4.5–5.5 V operation.
Can the MC74ACT20NG operate at 3.3 V supply voltage?
No, the MC74ACT20NG is not characterized or guaranteed for 3.3 V operation. Its Recommended Operating Conditions specify VCC = 4.5 V to 5.5 V only. At 3.3 V, input thresholds (VIH ≥ 2.0 V) would exceed 60% of VCC, risking unreliable logic recognition; output drive and propagation delay are also unspecified below 4.5 V. Use 74LVC20 or 74AUP2G00 for 3.3 V systems.
Are pins 3 and 10 (NC) required to be left floating, or can they be grounded?
Pins 3 and 10 are confirmed no-connect terminals per onsemi's datasheet Figure 1 and ordering information. They must not be connected to any signal or power net. While grounding them poses no immediate damage risk, doing so violates the manufacturer's recommended layout practice and may introduce unintended parasitic coupling. Best practice is to leave them unconnected and exclude from copper pours.
Does the MC74ACT20NG support hot-swap or live-insertion?
No, the MC74ACT20NG is not designed for hot-swap operation. It lacks powered-off protection circuitry (e.g., Ioff), and its absolute maximum ratings do not cover back-driving inputs while VCC = 0 V. Applying input signals before VCC stabilization risks latch-up or excessive ICC, as confirmed by the datasheet's "ILatch-Up" test condition (100 mA at 85°C). Always power VCC before asserting inputs.
What is the maximum capacitive load the MC74ACT20NG can drive while maintaining specified propagation delay?
The MC74ACT20NG's AC Characteristics are specified at CL = 50 pF, with tPLH/tPHL max = 10.5 ns at VCC = 5.0 V and TA = −40°C to +85°C. Driving loads >50 pF increases delay nonlinearly - e.g., at 100 pF, typical delay exceeds 15 ns. For loads >75 pF, add series termination or buffer stages; the device's 24 mA drive supports ≤50 pF reliably without waveform degradation.
MC74ACT20NG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- 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:
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
MC74ACT20NG FAQ
1.How can I place an order for MC74ACT20NG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74ACT20NG 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 MC74ACT20NG reliable?
The price and inventory of MC74ACT20NG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT20NG is usually 5 days.
3.What payment methods are accepted for MC74ACT20NG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT20NG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74ACT20NG?
MC74ACT20NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74ACT20NG 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 MC74ACT20NG?
For technical support, including MC74ACT20NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT20NG requirements.
6.How does Aetrix verify that MC74ACT20NG is sourced from the original manufacturer or authorized distributors?
All MC74ACT20NG 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 MC74ACT20NG meets industry standards.
7.What is the process for return or replacement of MC74ACT20NG?
All MC74ACT20NG units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT20NG, 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 MC74ACT20NG part is unused and in its original packaging.
Return procedure for MC74ACT20NG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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