74F280SJX Parity Generator/Checker - Equivalent & Substitute Parts

Part Overview

The 74F280SJX is a 9-bit parity generator/checker logic integrated circuit manufactured by onsemi in a 14-SOP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74F280 series provides parallel parity generation and checking functionality for digital systems requiring error detection in 9-bit data paths.

Key Parameters

Parameter	Specification
Logic Type	Parity Generator/Checker
Number of Circuits	9-Bit
Voltage Supply Range	4.5 V ~ 5.5 V
Output Current (High/Low)	1 mA / 20 mA
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Moisture Sensitivity Level	MSL 1 (Unlimited)
Series	74F

Substitute Part Grouping Explanation

Substitute parts for the 74F280SJX are qualified based on the following criteria:

Identical logic function: 9-bit parity generator/checker
Matching electrical specifications: 4.5 V ~ 5.5 V supply voltage, 1 mA / 20 mA output current, 0°C ~ 70°C operating temperature
Surface mount technology with compatible package footprints
Same base product number (74F280) ensuring functional equivalence
Moisture sensitivity level MSL 1 or better

All substitute parts listed maintain these core parameters, with variations only in packaging format (tube, tape & reel) and product status (active vs. last time buy).

Parameter Comparison

Parameter	74F280SJX (onsemi)	SN74F280BD (TI)	SN74F280BDR (TI)	SN74F280BNSR (TI)
Manufacturer	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	Parity Generator/Checker	Parity Generator/Checker	Parity Generator/Checker	Parity Generator/Checker
Number of Circuits	9-Bit	9-Bit	9-Bit	9-Bit
Voltage Supply	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V
Output Current (High/Low)	1 mA / 20 mA	1 mA / 20 mA	1 mA / 20 mA	1 mA / 20 mA
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	14-SOIC (0.209", 5.30mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.209", 5.30mm Width)
Product Status	Obsolete	Last Time Buy	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SN74F280BDR (Texas Instruments) is the primary recommended substitute. This part is currently active in production, ROHS3 compliant, and available in tape & reel packaging suitable for automated assembly. The electrical and functional specifications are identical to the 74F280SJX, with the same 9-bit parity generation/checking capability and operating parameters.

SN74F280BNSR (Texas Instruments) provides an alternative with matching package dimensions (0.209", 5.30mm width) to the original 74F280SJX, ensuring direct footprint compatibility without PCB redesign. This part is also active and ROHS3 compliant.

SN74F280BD (Texas Instruments) is available but classified as last time buy, indicating limited future availability. This option is suitable only for legacy system maintenance where immediate redesign is not feasible.

All three Texas Instruments substitutes maintain full electrical equivalence with the obsolete onsemi part across supply voltage, output current, operating temperature, and functional specifications.

Frequently Asked Questions (FAQ)

Q: Can SN74F280BDR directly replace 74F280SJX on existing PCBs?

A: SN74F280BDR uses a narrower 14-SOIC package (0.154", 3.90mm width) compared to the 74F280SJX (0.209", 5.30mm width). While electrically equivalent, PCB footprint modification is required. SN74F280BNSR maintains the original package width and provides direct footprint compatibility.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging (SN74F280BD) is suitable for manual assembly and small-volume applications. Tape & reel packaging (SN74F280BDR, SN74F280BNSR) is designed for automated pick-and-place assembly and high-volume production. Both contain identical components with the same electrical specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All three Texas Instruments substitutes (SN74F280BD, SN74F280BDR, SN74F280BNSR) are ROHS3 compliant. The original 74F280SJX RoHS status was not specified in available documentation.

Q: Which substitute should be selected for new designs?

A: SN74F280BDR is recommended for new designs due to active production status and tape & reel availability for automated assembly. If PCB redesign is not feasible, SN74F280BNSR maintains the original package dimensions.

Q: Do all parts share the same moisture sensitivity rating?

A: Yes. All parts, including the original 74F280SJX and all three substitutes, carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity concerns for storage and handling.

Q: Are there any functional differences between the substitute parts?

A: No. All substitute parts provide identical 9-bit parity generation/checker functionality with matching electrical specifications (4.5 V ~ 5.5 V supply, 1 mA / 20 mA output current, 0°C ~ 70°C operating temperature). Differences exist only in packaging format and product lifecycle status.

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