FOD8143S Equivalent & Substitute Parts

Part Overview

The FOD8143S is an optoisolator with transistor output manufactured by onsemi, designed for high-voltage isolation applications requiring 5000Vrms isolation rating. This component is classified as an active product with full RoHS3 compliance and REACH unaffected status. Alternative models become necessary when addressing specific application constraints such as packaging format requirements, inventory availability, or output voltage and current specifications that differ from the primary part.

Key Parameters

Parameter	Value
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	20% @ 1mA
Current Transfer Ratio (Max)	300% @ 1mA
Maximum Output Voltage	70V
Maximum Output Current	50mA
Rise / Fall Time	4µs, 3µs
Operating Temperature Range	-55°C ~ 105°C
Package Type	4-SMD, Gull Wing
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the FOD8143S is determined by the following critical parameters: isolation voltage rating (5000Vrms), single-channel transistor output configuration, input type (AC/DC), package format (4-SMD Gull Wing), and surface mount capability. Parts meeting these core requirements are classified as parametric equivalents or similar alternatives based on alignment with output voltage, output current, current transfer ratio specifications, and operating temperature range.

FOD814S qualifies as a parametric equivalent, maintaining identical specifications across all critical parameters. LTV-814HS and LTV-814HS-TA1 are classified as similar alternatives, sharing the same isolation voltage, channel count, output type, and package geometry, while differing in output voltage maximum (35V vs 70V), output current maximum (80mA vs 50mA), current transfer ratio ranges, and operating temperature range (-30°C ~ 100°C vs -55°C ~ 105°C). The distinction between LTV-814HS and LTV-814HS-TA1 is packaging format: tube versus tape & reel.

Parameter Comparison

Parameter	FOD8143S	FOD814S	LTV-814HS	LTV-814HS-TA1
Manufacturer	onsemi	onsemi	Lite-On Inc.	Lite-On Inc.
Isolation Voltage	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1
Output Type	Transistor	Transistor	Transistor	Transistor
Current Transfer Ratio (Min)	20% @ 1mA	20% @ 1mA	20% @ 100mA	20% @ 100mA
Current Transfer Ratio (Max)	300% @ 1mA	300% @ 1mA	80% @ 100mA	80% @ 100mA
Maximum Output Voltage	70V	70V	35V	35V
Maximum Output Current	50mA	50mA	80mA	80mA
Rise / Fall Time	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Operating Temperature Range	-55°C ~ 105°C	-55°C ~ 105°C	-30°C ~ 100°C	-30°C ~ 100°C
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Packaging Format	Tube	Tube	Tube	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

FOD814S is the direct parametric equivalent to FOD8143S, offering identical electrical specifications and operating characteristics. Selection between these onsemi parts depends on inventory availability and procurement lead times, as both maintain active product status and equivalent compliance certifications.

LTV-814HS and LTV-814HS-TA1 are suitable alternatives when application requirements permit reduced maximum output voltage (35V) and accommodate higher maximum output current (80mA). These Lite-On components maintain the same isolation voltage, channel configuration, and switching speed characteristics. The narrower operating temperature range (-30°C ~ 100°C) must be evaluated against application thermal requirements. LTV-814HS-TA1 differs only in packaging format (tape & reel versus tube), making it appropriate for high-volume automated assembly processes.

All substitute parts maintain active product status, RoHS3 compliance, and REACH unaffected designation, ensuring regulatory alignment with the primary part.

Frequently Asked Questions (FAQ)

Q: Can FOD814S be used as a direct replacement for FOD8143S? A: Yes. FOD814S is a parametric equivalent with identical isolation voltage, current transfer ratio, output voltage, output current, switching characteristics, and operating temperature range. Both are onsemi products with equivalent compliance status.

Q: What are the key differences between FOD8143S and LTV-814HS? A: The primary differences are manufacturer (onsemi vs Lite-On), maximum output voltage (70V vs 35V), maximum output current (50mA vs 80mA), current transfer ratio test conditions (1mA vs 100mA), and operating temperature range (-55°C ~ 105°C vs -30°C ~ 100°C). Isolation voltage, channel count, output type, and package geometry remain identical.

Q: When should LTV-814HS-TA1 be selected over LTV-814HS? A: LTV-814HS-TA1 should be selected when tape & reel packaging is required for automated pick-and-place assembly operations. Both parts are electrically and mechanically identical; the distinction is packaging format only.

Q: Are all substitute parts RoHS3 compliant? A: Yes. FOD814S, LTV-814HS, and LTV-814HS-TA1 are all RoHS3 compliant and REACH unaffected, matching the compliance status of FOD8143S.

Q: What is the impact of the narrower operating temperature range in LTV-814HS variants? A: LTV-814HS and LTV-814HS-TA1 operate from -30°C to 100°C, compared to FOD8143S at -55°C to 105°C. Applications requiring operation below -30°C or above 100°C must use FOD8143S or FOD814S.

Q: Can output voltage and current specifications be exceeded when substituting? A: No. Substitute parts must not be operated beyond their specified maximum ratings. LTV-814HS variants with 35V maximum output voltage and 80mA maximum output current are not suitable for applications requiring the 70V and 50mA capabilities of FOD8143S.

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