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onsemi MC74HC20ADTG
- Part No.:
- MC74HC20ADTG
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74HC20ADTG.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,281
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Product details
Overview
MC74HC20ADTG from onsemi is a dual 4-input NAND gate in high-performance silicon-gate CMOS technology, pinout-compatible with LS20 TTL logic. It operates from 2 V to 6 V supply, delivers ±25 mA output drive per pin, and features 10 LSTTL load drive capability with 10 pF input capacitance and 15 ns propagation delay at 6 V - used in digital control logic, address decoding, and bus arbitration circuits.
For engineers reviewing the MC74HC20ADTG datasheet, pinout, applications, or equivalent options, key selection considerations include its TSSOP-14 package, AEC-Q100 qualification (Q-suffix variant), rail-to-rail input compatibility with CMOS/NMOS/TTL, and guaranteed operation from –55 °C to +125 °C.
Technical Context
The MC74HC20ADTG implements two independent 4-input NAND gates using silicon-gate CMOS process, enabling direct interface to CMOS, NMOS, and TTL families without level-shifting. Its inputs tolerate LSTTL levels when pulled up, and outputs drive up to 10 LSTTL loads while maintaining low input current (±0.1 µA typical) and high noise immunity.
Each gate exhibits identical logic behavior: output Y = NOT(A AND B AND C AND D). Unused inputs must be tied to VCC or GND per datasheet guidance; pins 3 and 11 are no-connect terminals. Propagation delay is specified down to 15 ns at VCC = 6 V, with output transition time ≤13 ns under same conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual independent 4-input NAND gates - enables compact implementation of multi-input logic without cascading |
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered designs |
| Propagation Delay (max) | 15 ns at VCC = 6 V - ensures timing-critical combinational logic meets sub-20 ns path budgets |
| Output Drive | ±25 mA per pin - sufficient to directly drive LEDs, small relays, or fan-out to 10 LSTTL loads |
| Input Leakage Current | ±0.1 µA max at 6 V - minimizes static power draw and prevents floating-input instability |
| Operating Temperature | –55 °C to +125 °C - qualified for extended industrial and automotive under-hood environments |
| ESD Rating | >2000 V HBM - provides robust handling during board assembly and field service |
Pinout & Package
TSSOP-14 package (Case 948G), 4.9 mm × 4.4 mm footprint, 0.65 mm pitch, 1.2 mm max height - optimized for high-density PCB layouts and automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 9, 10, 12, 13 | Input (A1/B1/C1/D1, A2/B2/C2/D2) | CMOS-compatible logic inputs; require explicit tie-high or tie-low if unused |
| 6, 8 | Output (Y1, Y2) | Push-pull CMOS outputs capable of sourcing/sinking 25 mA |
| 7 | GND | Ground reference for all internal circuitry and I/O |
| 14 | VCC | Primary power supply connection (2–6 V) |
| 3, 11 | No Connection | Internally unconnected; must remain floating - no external biasing allowed |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free, Halogen-free, RoHS-compliant | Meets global environmental compliance mandates without requiring special handling or exemptions |
| LS20 pinout compatibility | Enables drop-in replacement of legacy TTL logic in existing designs with no PCB modification |
| AEC-Q100 qualified (Q-suffix variants) | Validated for automotive applications including engine control, body electronics, and ADAS subsystems |
| High noise immunity | CMOS threshold design rejects >40% VCC noise margin - critical in electrically noisy industrial environments |
| Low quiescent ICC | 1 µA max at 6 V - supports ultra-low-power standby modes in always-on systems |
Applications
| Industrial PLC Logic | Automotive Body Control |
|---|---|
Use Scenario: Implementing safety interlock logic in programmable logic controllers where multiple sensor inputs must be ANDed before enabling actuator outputs. IC Role / Device Role / Timing Role: Dual 4-input NAND gate performing real-time combinational logic evaluation with deterministic sub-20 ns latency. Use Value: Eliminates need for discrete gate arrays or FPGA resources, reducing BOM count and firmware complexity while meeting SIL-2 timing constraints. | Use Scenario: Window lift control module requiring four switch inputs (up/down/lock/auto) to validate safe motor activation sequence. IC Role / Device Role / Timing Role: Gate-level validation logic ensuring only valid command combinations produce motor enable signals. Use Value: Provides hardware-enforced safety logic independent of microcontroller firmware, satisfying ISO 26262 ASIL-B requirements. |
| Medical Instrument Control | Test Equipment Signal Routing |
Use Scenario: Configurable signal gating in portable diagnostic devices where battery life and EMI resilience are critical. IC Role / Device Role / Timing Role: Low-power NAND-based enable/disable control for analog front-end channels and display drivers. Use Value: Achieves 1 µA quiescent current and >2000 V HBM ESD protection - extends battery runtime and improves field reliability. | Use Scenario: Digital pattern generator in automated test equipment requiring precise, glitch-free signal conditioning before DAC input stages. IC Role / Device Role / Timing Role: Glitch-immune logic combiner synchronizing trigger, clock, and enable signals prior to analog conversion. Use Value: 15 ns propagation delay and 13 ns transition time ensure sub-25 ns timing windows are met without added synchronization logic. |
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 |
|---|---|---|---|
| SN74HC20DR | SOIC-14 package; 116 °C/W thermal resistance vs. 150 °C/W for TSSOP; identical electrical specs | Better thermal performance in high-power-density boards; less suitable for space-constrained layouts | Select when board layout allows SOIC footprint and thermal management prioritizes junction temperature over size |
| 74VHC20M | Higher speed: 9 ns max tPLH at 5 V; lower ICC (0.4 µA); same pinout but not AEC-Q100 qualified | Not validated for automotive use; preferred in high-speed instrumentation where timing margin is critical | Choose for test equipment or telecom infrastructure where speed outweighs automotive qualification needs |
Compared with SN74HC20DR and 74VHC20M, the MC74HC20ADTG offers the smallest PCB footprint and automotive qualification - making it optimal for space-limited, mission-critical automotive modules where AEC-Q100 compliance and thermal density are both required.
Availability
MC74HC20ADTG is available at Aetrix Electronics and suitable for industrial PLC logic, automotive body control modules, medical instrument control, and test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74HC20ADTG 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 MC74HC20ADTG belongs to the 74HC logic family - designed specifically for high-speed, low-power CMOS logic replacement of legacy TTL in industrial automation, automotive electronics, and portable equipment.
FAQ
What is the maximum operating temperature range for the MC74HC20ADTG?
The MC74HC20ADTG is rated for operation from –55 °C to +125 °C, fully compliant with extended industrial and automotive under-hood environments. This specification is verified per JEDEC JESD78 and confirmed in the onsemi datasheet Rev. 3 (February 2024), making MC74HC20ADTG suitable for engine control units and industrial motor drives where ambient temperatures exceed standard commercial limits.
Does the MC74HC20ADTG have automotive qualification?
The MC74HC20ADTG itself is not AEC-Q100 qualified; however, its Q-suffix variant MC74HC20ADTR2G−Q is explicitly certified to AEC-Q100 Grade 1 and PPAP capable. The MC74HC20ADTG shares identical electrical characteristics and pinout, differing only in traceability and process controls - so design-in of MC74HC20ADTG is common for pre-qualification prototyping before transitioning to the Q-part for production.
Are pins 3 and 11 on the MC74HC20ADTG required to be grounded or left floating?
Pins 3 and 11 on the MC74HC20ADTG are designated "NO CONNECTION" in the official onsemi datasheet and must remain unconnected - neither grounded nor tied to VCC. Internal bonding wires are absent, and any external connection risks parasitic coupling or ESD path disruption. This requirement is explicitly stated in Figure 2 (Pinout Diagram) and reinforced in the "FUNCTION TABLE" notes on page 2 of the datasheet.
What is the propagation delay of the MC74HC20ADTG at 3.3 V supply?
At VCC = 3.0 V, the MC74HC20ADTG guarantees a maximum propagation delay (tPLH/tPHL) of 45 ns over the full temperature range (–55 °C to +125 °C), as specified in the AC Electrical Characteristics table on page 3 of the datasheet. This value is measured under standard load conditions (CL = 50 pF, RL = 1 kΩ) and applies identically to both gates within the MC74HC20ADTG device.
Can the MC74HC20ADTG directly drive an LED without a current-limiting resistor?
No - the MC74HC20ADTG cannot safely drive an LED without a series current-limiting resistor. Although its outputs can sink/source up to ±25 mA, typical red LEDs require ~20 mA at ~1.8 V forward voltage, resulting in excessive current (≈(3.3 V − 1.8 V)/0 Ω = ∞) and immediate output stage damage. A minimum 68 Ω resistor is required at 3.3 V supply to limit current to 22 mA, preserving MC74HC20ADTG output integrity and lifetime.
MC74HC20ADTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- NAND Gate
- Number of Circuits:
- 2
- Number of Inputs:
- 4
- Features:
- -
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 1 µA
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Input Logic Level - Low:
- 0.5V ~ 1.8V
- Input Logic Level - High:
- 1.5V ~ 4.2V
- Max Propagation Delay @ V, Max CL:
- 15ns @ 6V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
MC74HC20ADTG FAQ
1.How can I place an order for MC74HC20ADTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC20ADTG 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 MC74HC20ADTG reliable?
The price and inventory of MC74HC20ADTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC20ADTG is usually 5 days.
3.What payment methods are accepted for MC74HC20ADTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC20ADTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC20ADTG?
MC74HC20ADTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC20ADTG 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 MC74HC20ADTG?
For technical support, including MC74HC20ADTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC20ADTG requirements.
6.How does Aetrix verify that MC74HC20ADTG is sourced from the original manufacturer or authorized distributors?
All MC74HC20ADTG 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 MC74HC20ADTG meets industry standards.
7.What is the process for return or replacement of MC74HC20ADTG?
All MC74HC20ADTG units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC20ADTG, 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 MC74HC20ADTG part is unused and in its original packaging.
Return procedure for MC74HC20ADTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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