Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Logic > Gates and Inverters

onsemi 74F20SJX

Name: 74F20SJX
Brand: onsemi
SKU: 74F20SJX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 74F20SJX

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: 14-SOIC (0.209", 5.30mm Width)

Datasheet:: 74F20SJX.pdf

Description:: IC GATE NAND 2CH 4-INP 14SOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,991

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

74F20SJX from Fairchild Semiconductor is a dual 4-input NAND gate logic IC in 14-lead SOP (EIAJ TYPE II, 5.3 mm wide) package, operating at +4.5V to +5.5V supply, with propagation delays as low as 1.5 ns (tPHL) and output drive capability of −1 mA/20 mA, used in high-speed TTL-compatible digital control and address decoding circuits.

For engineers reviewing the 74F20SJX datasheet, pinout, applications, or equivalent options, key selection considerations include guaranteed fan-out of 50/33.3 (HIGH/LOW), input voltage thresholds (VIH = 2.0 V, VIL = 0.8 V), and industrial temperature range support (−55°C to +125°C bias).

Technical Context

The 74F20SJX implements two independent TTL-compatible 4-input NAND gates with standard open-collector–compatible output structure and no internal pull-ups. Each gate accepts four inputs (An–Dn) and delivers one buffered complementary output (On), supporting wired-AND expansion via external pull-up resistors.

It operates under strict DC and AC electrical constraints: VIH/VIL thresholds ensure noise immunity in mixed-signal environments, while tPLH/tPHL timing parameters are specified across load (CL = 50 pF) and temperature (0°C to +70°C ambient), enabling reliable use in synchronous bus interface and clocked enable logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	+4.5 V to +5.5 V - ensures compatibility with standard 5 V TTL and LVTTL systems
Input HIGH Voltage (VIH)	2.0 V min - guarantees recognition of valid HIGH signal under worst-case noise margin
Input LOW Voltage (VIL)	0.8 V max - defines maximum voltage accepted as LOW, critical for interfacing with legacy CMOS outputs
Output Drive (IOL/IOH)	20 mA / −1 mA - supports direct driving of multiple TTL inputs or small LEDs without buffer
Propagation Delay (tPHL)	1.5 ns min (typ. 3.2 ns) - enables sub-5 ns gate-level timing in high-speed combinatorial logic paths
Fan-Out (HIGH/LOW)	50 / 33.3 - quantifies maximum number of standard TTL inputs that can be driven reliably
Operating Temperature	−55°C to +125°C (bias) - validated for extended industrial and automotive under-hood applications

Pinout & Package

74F20SJX is housed in a 14-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M14D), with gull-wing leads and standard JEDEC-compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5	Gate 1 Inputs (A1–D1)	Four logic inputs for first NAND gate; all must be HIGH to yield LOW output
6	Gate 1 Output (O1)	Active-low open-collector output; requires external pull-up for HIGH state
8	GND	Ground reference for all internal circuitry and I/O
9, 10, 12, 13	Gate 2 Inputs (A2–D2)	Four logic inputs for second independent NAND gate
14	VCC	+4.5 V to +5.5 V power supply connection
11	Gate 2 Output (O2)	Second independent active-low open-collector output

Key Features

Feature	Design Value
High-Speed F-Series Logic	Guaranteed tPHL ≤ 4.3 ns at +25°C ensures timing closure in >100 MHz system control paths
Standard TTL Interface Compatibility	VIH/VIL and IIL/IOH match 74LS/74F families, enabling drop-in replacement in legacy designs
Open-Collector Outputs	Supports wired-AND bus arbitration and level translation when paired with external pull-up resistors
Wide Operating Temperature Range	−55°C to +125°C junction rating allows deployment in engine control units and industrial PLC I/O modules
Low Power Consumption	ICCL = 3.4 mA max at VO = LOW reduces heat generation in dense logic arrays

Applications

Memory Address Decoding	Bus Enable Control
Use Scenario: Selecting specific RAM or ROM chips within a microprocessor-based system using multi-bit address lines. IC Role / Device Role / Timing Role: Dual 4-input NAND gate performing active-low chip select generation from decoded address bits. Use Value: Enables compact, low-latency decoding of 4-bit segments without additional glue logic or programmable devices.	Use Scenario: Enabling/disabling data transfer on shared parallel buses (e.g., ISA, VME) based on control signals. IC Role / Device Role / Timing Role: Generating synchronized bus enable strobes from CPU control lines and peripheral readiness flags. Use Value: Provides deterministic, sub-5 ns setup/hold timing for bus arbitration, preventing data contention.
Industrial Sensor Interface Logic	Legacy System Glue Logic
Use Scenario: Combining multiple sensor fault signals (e.g., overtemperature, overpressure, flow loss) into a single alarm output. IC Role / Device Role / Timing Role: Wired-AND configured NAND gate acting as fault aggregation node with fail-safe LOW-active output. Use Value: Delivers immediate, hardware-level fault detection without software latency or MCU intervention.	Use Scenario: Interfacing vintage peripherals (e.g., floppy controllers, CRT display logic) with modern FPGA-based host systems. IC Role / Device Role / Timing Role: Level-shifting and signal conditioning between 5 V TTL and 3.3 V LVTTL domains using open-collector configuration. Use Value: Eliminates need for dedicated level translators while preserving timing integrity and noise immunity.

Memory Address Decoding

Bus Enable Control

Use Scenario: Selecting specific RAM or ROM chips within a microprocessor-based system using multi-bit address lines.

IC Role / Device Role / Timing Role: Dual 4-input NAND gate performing active-low chip select generation from decoded address bits.

Use Value: Enables compact, low-latency decoding of 4-bit segments without additional glue logic or programmable devices.

Use Scenario: Enabling/disabling data transfer on shared parallel buses (e.g., ISA, VME) based on control signals.

IC Role / Device Role / Timing Role: Generating synchronized bus enable strobes from CPU control lines and peripheral readiness flags.

Use Value: Provides deterministic, sub-5 ns setup/hold timing for bus arbitration, preventing data contention.

Industrial Sensor Interface Logic

Legacy System Glue Logic

Use Scenario: Combining multiple sensor fault signals (e.g., overtemperature, overpressure, flow loss) into a single alarm output.

IC Role / Device Role / Timing Role: Wired-AND configured NAND gate acting as fault aggregation node with fail-safe LOW-active output.

Use Value: Delivers immediate, hardware-level fault detection without software latency or MCU intervention.

Use Scenario: Interfacing vintage peripherals (e.g., floppy controllers, CRT display logic) with modern FPGA-based host systems.

IC Role / Device Role / Timing Role: Level-shifting and signal conditioning between 5 V TTL and 3.3 V LVTTL domains using open-collector configuration.

Use Value: Eliminates need for dedicated level translators while preserving timing integrity and noise immunity.

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
SN74F20N	PDIP package (N14A), same electrical specs but larger footprint and higher thermal resistance	Better suited for prototyping and through-hole PCBs; not recommended for high-density surface-mount assemblies	Select when manual soldering, breadboarding, or legacy board rework is required
74F20SC	SOIC package (M14A), 0.150" narrow body vs. 5.3 mm wide SOP; identical AC/DC specs	Compatible with tighter pitch layouts but requires different land pattern and reflow profile	Choose for space-constrained boards where JEDEC MS-120 SOIC is preferred over EIAJ SOP

Compared with SN74F20N and 74F20SC, the 74F20SJX offers optimized mechanical fit for EIAJ-standard SOP footprints while retaining full functional and timing equivalence-making it ideal for volume production where standardized 5.3 mm wide SOP placement and automated assembly are prioritized.

Availability

74F20SJX is available at Aetrix Electronics and suitable for memory decoding, bus control, industrial sensor aggregation, and legacy system interface applications requiring stable component supply and long-term industrial temperature support.

Supply support for 74F20SJX 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and discrete power products, acquired by ON Semiconductor in 2016; its logic portfolio remains widely deployed in industrial and automotive systems.

The 74F20SJX belongs to the 74F (Fast TTL) logic family, designed specifically for high-speed, low-power digital control in embedded systems where timing predictability and TTL interoperability are essential.

FAQ

What is the maximum operating temperature range for the 74F20SJX?

The 74F20SJX is rated for junction temperatures from −55°C to +150°C under bias, with recommended ambient operation from 0°C to +70°C. Its absolute maximum storage temperature is −65°C to +150°C, making it suitable for under-hood automotive and industrial control environments where thermal cycling is expected. The 74F20SJX maintains full AC/DC specifications across this extended range.

Does the 74F20SJX have push-pull or open-collector outputs?

The 74F20SJX features standard TTL-compatible open-collector outputs-not push-pull. Each output (O1 and O2) requires an external pull-up resistor to achieve a defined HIGH state. This architecture enables wired-AND functionality and voltage-level translation, which is confirmed in the Connection Diagram and DC Electrical Characteristics table of the official Fairchild DS009462 datasheet for the 74F20SJX.

Can the 74F20SJX be used as a direct replacement for 74LS20 in existing designs?

The 74F20SJX can replace 74LS20 in most cases due to matching pinout, identical 4-input NAND function, and compatible VIH/VIL thresholds. However, the 74F20SJX offers faster propagation (≤4.3 ns vs. ≤15 ns for 74LS20) and higher drive strength (20 mA vs. 8 mA), which may require verifying timing margins and bus loading. The 74F20SJX also draws more supply current (ICCL up to 5.1 mA), so power budgeting should be reviewed.

What is the fan-out capability of the 74F20SJX?

The 74F20SJX provides a fan-out of 50 for HIGH-level outputs and 33.3 for LOW-level outputs, calculated relative to standard TTL input loads (40 µA HIGH, 1.6 mA LOW). This means each output can reliably drive up to 50 standard TTL inputs when sourcing current (HIGH) or 33 inputs when sinking (LOW), as specified in the Unit Loading/Fan Out section of the 74F20SJX datasheet.

Is the 74F20SJX RoHS compliant?

The 74F20SJX was originally manufactured prior to RoHS enforcement and is not inherently RoHS compliant. Fairchild's documentation (DS009462, July 1999) does not specify lead-free finish or RoHS status. For new designs requiring compliance, consult ON Semiconductor's current equivalents (e.g., MC74F20) or verify material declarations directly with Aetrix Electronics' traceable lot documentation for the 74F20SJX.

74F20SJX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74F

Package/Case:: 14-SOIC (0.209", 5.30mm 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):: -

Current - Output High, Low:: 1mA, 20mA

Input Logic Level - Low:: 0.8V

Input Logic Level - High:: 2V

Max Propagation Delay @ V, Max CL:: 5ns @ 5V, 50pF

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOP

74F20SJX FAQ

1.How can I place an order for 74F20SJX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74F20SJX 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 74F20SJX reliable?

The price and inventory of 74F20SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74F20SJX is usually 5 days.

3.What payment methods are accepted for 74F20SJX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74F20SJX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74F20SJX?

74F20SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74F20SJX 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 74F20SJX?

For technical support, including 74F20SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74F20SJX requirements.

6.How does Aetrix verify that 74F20SJX is sourced from the original manufacturer or authorized distributors?

All 74F20SJX 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 74F20SJX meets industry standards.

7.What is the process for return or replacement of 74F20SJX?

All 74F20SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74F20SJX, 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 74F20SJX part is unused and in its original packaging.

Return procedure for 74F20SJX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…