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onsemi MC74ACT20DR2
- Part No.:
- MC74ACT20DR2
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC74ACT20DR2.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,871
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Product details
Overview
MC74ACT20DR2 from onsemi is a dual 4-input NAND gate in high-performance silicon-gate CMOS technology, designed for logic-level signal conditioning and combinatorial control in digital systems. It features TTL-compatible inputs, ±24 mA output drive capability, 5.0 V nominal supply operation, propagation delay ≤10.5 ns at 5 V/50 pF, and operates across −40°C to +85°C ambient temperature.
For engineers reviewing the MC74ACT20DR2 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOIC-14 pin mapping, real-world use cases in industrial control and interface logic, and two validated alternative parts with documented functional and application differences.
Technical Context
The MC74ACT20DR2 implements two independent 4-input NAND gates using advanced CMOS process technology, enabling rail-to-rail output swing and noise-immune switching. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) allow direct interfacing with legacy bipolar logic families without level-shifting circuitry.
Each gate supports full 5 V operation with guaranteed VOH ≥ 4.4 V and VOL ≤ 0.44 V under 24 mA load, and exhibits low dynamic power dissipation (CPD = 40 pF) with ICC ≤ 40 µA in quiescent state. Propagation delays are characterized over temperature and voltage with tPLH/tPHL ≤ 10.5 ns (max) at 5.0 V and CL = 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual independent 4-input NAND gates - enables compact implementation of multi-input logic conditions without external gating. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V digital rails and tolerant of typical ±5% regulation variation. |
| Output Drive | ±24 mA per output - sufficient to directly drive LEDs, small relays, or fan-out to ≥10 LS-TTL loads. |
| Propagation Delay | ≤10.5 ns at 5 V/50 pF - supports reliable operation in systems with clock rates up to ~50 MHz for simple combinational paths. |
| Input Compatibility | TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - eliminates need for external translators when interfacing with 74LS/74F devices. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control, instrumentation, and automation equipment. |
| Package | SOIC-14 (Case 751A) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns. |
Pinout & Package
MC74ACT20DR2 is housed in a 14-lead SOIC package (Case 751A), measuring 8.75 mm × 3.90 mm × 1.65 mm, with 1.27 mm pitch gull-wing leads and Pb-free finish (RoHS compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | Inputs (A0–D0, A1–D1) | Eight logic inputs grouped as two sets of four - each set feeds one NAND gate; no internal connection between groups. |
| 3, 13 | No Connect (NC) | Unbonded pins - must remain unconnected; no internal circuitry or thermal function. |
| 6, 10 | Outputs (O0, O1) | Active-low open-drain–compatible CMOS outputs - provide full rail-swing, capable of sourcing/sinking 24 mA. |
| 7 | GND | Ground reference for all inputs, outputs, and internal logic - requires low-impedance PCB return path. |
| 14 | VCC | Positive supply terminal - must be decoupled locally with 0.1 µF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Enables plug-in replacement of 74LS20 in existing 5 V designs without redesigning input interface networks. |
| High Output Drive (±24 mA) | Reduces need for external buffer stages when driving moderate capacitive or resistive loads in PLC I/O modules. |
| Pb-Free SOIC-14 Packaging | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity Level 1 - suitable for lead-free reflow processes. |
| Low Quiescent ICC (≤40 µA) | Minimizes standby power in battery-backed or energy-sensitive applications such as remote sensor nodes. |
| Guaranteed Operation to 85°C | Supports deployment in enclosed industrial enclosures without forced air cooling or derating. |
Applications
| Industrial Control Logic | Legacy System Interface |
|---|---|
Use Scenario: Implementing safety interlock logic in programmable logic controller (PLC) backplane modules where four sensor inputs must all be asserted before enabling an output. IC Role / Device Role / Timing Role: Dual 4-input NAND gate performing active-low enable decoding with deterministic propagation delay <10.5 ns. Use Value: Eliminates discrete resistor-transistor logic or multiple smaller gates, reducing BOM count and board area while maintaining timing predictability. |
Use Scenario: Interfacing modern microcontroller GPIOs with legacy 74LS-based peripheral cards requiring strict TTL voltage thresholds. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer providing TTL-compatible inputs and CMOS-compatible outputs in a single device. Use Value: Avoids dedicated level translators; leverages native VIH/VIL specs to ensure reliable recognition of LS-family HIGH/LOW states at 5 V. |
| Power Sequencing Control | Test Equipment Signal Conditioning |
Use Scenario: Generating synchronized enable signals for multiple DC-DC converters in a multi-rail power supply, conditioned on presence of all input voltages. IC Role / Device Role / Timing Role: Combinatorial gate enforcing AND-of-four conditions (inverted as NAND) to assert a global "power good" flag. Use Value: Provides glitch-free, race-free assertion of sequenced enable lines due to matched internal propagation paths and low skew (<1 ns typical). |
Use Scenario: Cleaning up noisy digital trigger signals from mechanical switches or analog comparators in automated test equipment front-ends. IC Role / Device Role / Timing Role: Input debouncing and signal inversion stage with defined hysteresis-free threshold and fast edge response. Use Value: Delivers consistent 10 ns-scale transition times and robust noise immunity via controlled input capacitance (CIN = 4.5 pF) and low VOL. |
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 AC/DC specs; manufactured by Texas Instruments with same 5 V operation and ±24 mA drive. | No functional deviation - validated for drop-in use in TI-design ecosystems and mixed-supplier BOMs. | Select when TI qualification or dual-sourcing strategy mandates TI-branded equivalents. |
| MC74AC20DR2G | Same package and pinout but AC-series: CMOS-only inputs (VIH = 3.15 V min at 4.5 V), lower drive (±24 mA same), slightly higher propagation delay (max 8.5 ns at 3.3 V, 10.0 ns at 5 V). | Requires verified HIGH-level input voltage ≥3.15 V; unsuitable for direct 74LS interface without pull-up or translator. | Prefer when system uses only CMOS-compatible sources and lower static power (ICC ≤ 4 µA typ) is prioritized over TTL compatibility. |
Compared with MC74ACT20DR2, SN74ACT20DR offers identical performance and true drop-in substitution, while MC74AC20DR2G trades TTL input compatibility for marginally lower quiescent current and stricter input voltage requirements - making it viable only in fully CMOS-sourced designs.
Availability
MC74ACT20DR2 is available at Aetrix Electronics and suitable for industrial control logic, legacy system interface, and power sequencing applications requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for MC74ACT20DR2 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, high-reliability components for automotive, industrial, cloud, and IoT applications.
The MC74ACT20DR2 belongs to onsemi's 74ACT logic family, engineered for seamless interoperability with TTL systems while delivering CMOS advantages - targeting industrial control, instrumentation, and upgrade paths for legacy digital hardware.
FAQ
What logic function does the MC74ACT20DR2 implement?
The MC74ACT20DR2 implements two independent 4-input NAND gates. Each gate performs the Boolean function Y = NOT(A AND B AND C AND D), with inputs A0–D0 feeding one gate and A1–D1 feeding the second. Outputs O0 and O1 are active-low, fully buffered CMOS signals. This configuration enables compact realization of multi-input logic conditions in digital control circuits without external combining logic.
Is the MC74ACT20DR2 pin-compatible with the 74LS20?
No, the MC74ACT20DR2 is not pin-compatible with the 74LS20. While both are dual 4-input NAND gates, the 74LS20 uses a different pinout: its inputs and outputs are arranged differently across the 14-pin DIP package, and it lacks the NC pins present on the MC74ACT20DR2 SOIC-14 layout. However, the MC74ACT20DR2 provides TTL-compatible input thresholds, allowing functional replacement in many 74LS20 applications when board layout accommodates the SOIC-14 footprint.
What is the maximum operating supply voltage for the MC74ACT20DR2?
The absolute maximum DC supply voltage (VCC) for the MC74ACT20DR2 is +6.5 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operation outside this range - especially above 5.5 V - risks exceeding input/output voltage limits, increasing ICC, accelerating wear-out mechanisms, and violating the device's AC timing guarantees. The datasheet specifies all AC and DC parameters only within the 4.5–5.5 V window.
Does the MC74ACT20DR2 support mixed-voltage operation (e.g., 3.3 V inputs with 5 V supply)?
No, the MC74ACT20DR2 does not support reliable mixed-voltage operation. Its TTL-compatible inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V when VCC = 4.5–5.5 V, but applying 3.3 V logic signals directly to inputs while VCC = 5 V may result in marginal or undefined switching behavior. For 3.3 V logic interfacing, a dedicated level translator or a 3.3 V–optimized logic family (e.g., 74LVC) is required - the MC74ACT20DR2 is designed exclusively for 5 V system integration.
What is the significance of the "R2" suffix in MC74ACT20DR2?
The "R2" suffix in MC74ACT20DR2 indicates tape-and-reel packaging: specifically, 2500 units per reel in SOIC-14 carrier tape. This format is optimized for automated SMT placement and high-volume manufacturing. The base part number MC74ACT20 is identical electrically and physically; the R2 designation solely reflects packaging and shipping configuration - not a revision, performance variant, or functional difference. Other variants include DG (rail-packaged) and G (Pb-free indicator).
MC74ACT20DR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MC74ACT20DR2 FAQ
1.How can I place an order for MC74ACT20DR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74ACT20DR2 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 MC74ACT20DR2 reliable?
The price and inventory of MC74ACT20DR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT20DR2 is usually 5 days.
3.What payment methods are accepted for MC74ACT20DR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT20DR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74ACT20DR2?
MC74ACT20DR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74ACT20DR2 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 MC74ACT20DR2?
For technical support, including MC74ACT20DR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT20DR2 requirements.
6.How does Aetrix verify that MC74ACT20DR2 is sourced from the original manufacturer or authorized distributors?
All MC74ACT20DR2 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 MC74ACT20DR2 meets industry standards.
7.What is the process for return or replacement of MC74ACT20DR2?
All MC74ACT20DR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT20DR2, 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 MC74ACT20DR2 part is unused and in its original packaging.
Return procedure for MC74ACT20DR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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