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

onsemi 74F20SJ

Name: 74F20SJ
Brand: onsemi
SKU: 74F20SJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74F20SJ

Manufacturer:: onsemi

Category:: Gates and Inverters

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

Datasheet:: 74F20SJ.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74F20SJ from Fairchild Semiconductor is a dual 4-input NAND gate logic IC in a 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 digital control and address decoding circuits.

For engineers reviewing the 74F20SJ datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), fan-out of 50 (standard output), AC performance across 0°C to +70°C, and JEDEC-compliant EIAJ TYPE II SOP packaging.

Technical Context

The 74F20SJ implements two independent 4-input NAND gates using Fairchild's F-series bipolar TTL process, delivering improved speed-power trade-offs over standard 74LS logic. It supports standard TTL-level interfacing with defined input clamp diodes and output short-circuit current limits up to −150 mA.

Each gate accepts four inputs (An–Dn) and produces one active-low NAND output (On); no internal enable, latch, or three-state functionality is present. The device requires a single +5 V supply and exhibits asymmetric propagation delays (tPLH > tPHL) due to bipolar transistor switching characteristics.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	+4.5 V to +5.5 V - ensures compatibility with standard 5 V TTL systems and margin against rail droop
Input LOW Voltage (VIL)	0.8 V max - guarantees reliable recognition of logic LOW from legacy TTL or LSTTL sources
Output LOW Current (IOL)	20 mA - drives up to 5 standard TTL loads (fan-out = 50) without exceeding VOL = 0.5 V
Propagation Delay (tPHL)	1.5 ns min at TA = −55°C to +125°C - enables use in high-speed timing-critical paths
Power Supply Current (ICCL)	5.1 mA max at VO = LOW - defines worst-case dynamic power draw per gate under load
Operating Temperature	0°C to +70°C - commercial-grade rating suitable for office, industrial control, and instrumentation environments
Input Clamp Diode Voltage	−1.2 V min at IIN = −18 mA - protects inputs against negative transients during hot insertion or ESD events

Pinout & Package

74F20SJ 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 1.27 mm pitch.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5	Gate 1 Inputs (A1, B1, C1, D1)	Four logic inputs to first NAND gate; TTL-compatible voltage thresholds and current sinking/sourcing
6	Gate 1 Output (O1)	Active-low NAND output; capable of sourcing −1 mA or sinking 20 mA into standard TTL loads
8	GND	Ground reference for all internal circuitry and I/O; must be connected to system common ground plane
9, 10, 12, 13	Gate 2 Inputs (A2, B2, C2, D2)	Four logic inputs to second independent NAND gate; electrically isolated from Gate 1
11	Gate 2 Output (O2)	Active-low NAND output; identical DC/AC specs to O1; no internal coupling or shared resources
14	VCC	+5 V supply pin; bypass capacitor (0.1 µF) recommended near pin to suppress high-frequency noise

Key Features

Feature	Design Value
Dual independent 4-input NAND gates	Enables compact implementation of two separate 4-input logic functions without inter-gate delay coupling
TTL-compatible input thresholds	VIL ≤ 0.8 V and VIH ≥ 2.0 V ensure interoperability with 74LS, 74S, and legacy microprocessor bus signals
High-speed propagation	tPHL as low as 1.5 ns allows use in clocked systems with ≤ 200 MHz toggle rates under nominal conditions
Robust output drive	20 mA sink capability supports direct driving of LEDs, small relays, or multiple downstream TTL inputs
Input clamp diodes	Integrated −1.2 V clamping enables safe operation during negative transient events without external protection

Applications

Address Decoding	Bus Control Logic
Use Scenario: Selecting memory or peripheral chips in 8-bit microprocessor systems (e.g., Z80, 8085) using 4-bit address lines. IC Role / Device Role / Timing Role: Dual 4-input NAND gate performing active-low chip select generation with minimal propagation delay. Use Value: Enables fast, deterministic decode timing with guaranteed setup/hold margins due to sub-5 ns worst-case tPLH/tPHL.	Use Scenario: Managing read/write strobes and direction control in bidirectional data bus interfaces. IC Role / Device Role / Timing Role: Combining control signals (RD, WR, DIR) to generate gated bus-enable outputs. Use Value: Provides noise-immune, high-fan-out logic combining without added propagation skew between parallel paths.
State Machine Encoding	Test Pattern Generation
Use Scenario: Implementing next-state logic in synchronous finite-state machines for industrial PLC sequencers. IC Role / Device Role / Timing Role: Computing state transition conditions from 4-bit register outputs and control flags. Use Value: Delivers deterministic, race-free combinational logic with verified worst-case delay bounds across temperature.	Use Scenario: Generating deterministic stimulus patterns for digital circuit validation in ATE environments. IC Role / Device Role / Timing Role: Producing synchronized multi-bit test vectors via cascaded NAND logic trees. Use Value: Ensures repeatable, jitter-free pattern edges due to matched internal gate delays and low-output impedance.

Address Decoding

Bus Control Logic

Use Scenario: Selecting memory or peripheral chips in 8-bit microprocessor systems (e.g., Z80, 8085) using 4-bit address lines.

IC Role / Device Role / Timing Role: Dual 4-input NAND gate performing active-low chip select generation with minimal propagation delay.

Use Value: Enables fast, deterministic decode timing with guaranteed setup/hold margins due to sub-5 ns worst-case tPLH/tPHL.

Use Scenario: Managing read/write strobes and direction control in bidirectional data bus interfaces.

IC Role / Device Role / Timing Role: Combining control signals (RD, WR, DIR) to generate gated bus-enable outputs.

Use Value: Provides noise-immune, high-fan-out logic combining without added propagation skew between parallel paths.

State Machine Encoding

Test Pattern Generation

Use Scenario: Implementing next-state logic in synchronous finite-state machines for industrial PLC sequencers.

IC Role / Device Role / Timing Role: Computing state transition conditions from 4-bit register outputs and control flags.

Use Value: Delivers deterministic, race-free combinational logic with verified worst-case delay bounds across temperature.

Use Scenario: Generating deterministic stimulus patterns for digital circuit validation in ATE environments.

IC Role / Device Role / Timing Role: Producing synchronized multi-bit test vectors via cascaded NAND logic trees.

Use Value: Ensures repeatable, jitter-free pattern edges due to matched internal gate delays and low-output impedance.

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	Same logic function and AC/DC specs; packaged in PDIP (N14A) instead of SOP (M14D)	Preferred for through-hole prototyping or legacy board rework where SOP footprint unavailable	Select when manual soldering, breadboarding, or socket-based testing is required
74ACT20SCX	CMOS technology; higher noise immunity (VIH = 3.5 V), lower ICC (1 µA typ), but slower tPLH (7 ns min)	Better for mixed-voltage systems (3.3 V/5 V interface) and ultra-low static power designs	Select when power efficiency or noise margin outweighs raw speed requirements

Compared with SN74F20N and 74ACT20SCX, the 74F20SJ offers optimal balance of speed, drive strength, and surface-mount compatibility for cost-sensitive commercial-grade digital control boards requiring proven TTL interoperability.

Availability

74F20SJ is available at Aetrix Electronics and suitable for address decoding, bus control logic, state machine encoding, and test pattern generation requiring stable component supply and long-term industrial availability.

Supply support for 74F20SJ 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 leading designer and manufacturer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016; known for high-reliability logic, power, and interface products.

The 74F20SJ belongs to Fairchild's F-series TTL logic family, engineered for high-speed commercial digital systems where predictable timing, robust fan-out, and backward compatibility with legacy TTL buses were critical design requirements.

FAQ

What logic function does the 74F20SJ implement?

The 74F20SJ implements two independent 4-input NAND gates. Each gate outputs a logic LOW only when all four inputs are HIGH; otherwise, it outputs HIGH. This behavior follows standard Boolean NAND logic (Y = NOT(A AND B AND C AND D)), and the 74F20SJ delivers this function with TTL-compatible voltage thresholds, propagation delays down to 1.5 ns, and output drive sufficient for driving five standard TTL loads.

What is the correct supply voltage range for stable operation of the 74F20SJ?

The 74F20SJ operates reliably within a supply voltage range of +4.5 V to +5.5 V. Operation outside this range risks violating absolute maximum ratings-specifically, VCC must not exceed +7.0 V or drop below −0.5 V relative to GND. At +5.0 V nominal, the device meets all AC and DC specifications including VOH ≥ 2.5 V and VOL ≤ 0.5 V under rated load, making +5.0 V the recommended target for consistent 74F20SJ performance.

Does the 74F20SJ support three-state or open-collector outputs?

No, the 74F20SJ does not support three-state or open-collector outputs. It features standard push-pull TTL outputs capable of sourcing −1 mA (in HIGH state) and sinking 20 mA (in LOW state). The datasheet confirms no enable/disable control pins, no output disable function, and no internal pull-up or pull-down resistors-only active-drive outputs compatible with standard TTL fan-out rules. This applies strictly to the 74F20SJ; other variants like 74F20PC share identical output architecture.

What is the maximum operating ambient temperature for the 74F20SJ?

The 74F20SJ is specified for commercial-grade operation from 0°C to +70°C ambient temperature. While absolute maximum ratings allow bias up to +125°C junction temperature, the AC electrical characteristics-including propagation delay and output drive-are only guaranteed across the 0°C to +70°C range. For extended-temperature applications, engineers should consult derating curves or consider industrial-grade alternatives such as the 74F20SJ's military-spec counterpart if available.

How does the 74F20SJ differ from the 74LS20 in practical design use?

The 74F20SJ offers significantly faster propagation delays (1.5–5.3 ns vs. 15–30 ns for 74LS20), higher output drive (20 mA vs. 8 mA), and lower power consumption per gate at high frequencies. However, it retains full TTL voltage compatibility (VIL = 0.8 V, VIH = 2.0 V), allowing direct replacement in most 74LS20 sockets-provided PCB layout accommodates the narrower SOP package (M14D) and thermal management accounts for higher peak current demands of the 74F20SJ.

74F20SJ Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74F

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

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):: -

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

74F20SJ FAQ

1.How can I place an order for 74F20SJ through Aetrix?

Please submit a Request for Quotation (RFQ) for 74F20SJ 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 74F20SJ reliable?

The price and inventory of 74F20SJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74F20SJ is usually 5 days.

3.What payment methods are accepted for 74F20SJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74F20SJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74F20SJ?

74F20SJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74F20SJ 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 74F20SJ?

For technical support, including 74F20SJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74F20SJ requirements.

6.How does Aetrix verify that 74F20SJ is sourced from the original manufacturer or authorized distributors?

All 74F20SJ 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 74F20SJ meets industry standards.

7.What is the process for return or replacement of 74F20SJ?

All 74F20SJ units undergo pre-shipment inspection (PSI). If there is an issue with 74F20SJ, 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 74F20SJ part is unused and in its original packaging.

Return procedure for 74F20SJ:

1.Submit a request within 90 days.

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

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