S310FA Schottky Diode Equivalent & Substitute Parts

Part Overview

The S310FA is a 100V, 3A Schottky rectifier diode manufactured by onsemi in SOD-123FA surface mount packaging. This component is classified as Not For New Designs, indicating it has reached end-of-life status. The part carries automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. Due to its discontinued status, equivalent and substitute parts from active manufacturers are necessary for ongoing production requirements and design continuity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 100 V
Operating Temperature - Junction	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123W
Technology	Schottky
RoHS Status	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the S310FA is determined by the following critical parameters: reverse voltage rating (100V), average rectified current (3A), forward voltage drop (850 mV @ 3A), fast recovery speed (≤ 500ns), operating temperature range (-55°C ~ 150°C), surface mount technology, and RoHS3 compliance.

Substitute parts are grouped into two categories:

Parametric Equivalents (Full Electrical Match): Parts that match all critical electrical specifications and operating temperature range while maintaining the same 3A current rating and 100V reverse voltage. These parts are direct functional replacements.

Functional Substitutes (Current Derating): Parts that meet the voltage and speed requirements but operate at reduced current ratings (1A instead of 3A). These are suitable only for applications where the circuit current demand does not exceed the substitute part's rating.

Package Variants: Substitute parts may use alternative surface mount packages (SOD-123W or DO-219AB) that are mechanically compatible with standard PCB layouts for these diode form factors.

Parameter Comparison

Parameter	S310FA (onsemi)	SS310LW (TSC)	SS310LWH (TSC)	SS110LWH (TSC)	V3FM10-M3/H (Vishay)
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	3 A	3 A	3 A	1 A	3 A
Voltage - Forward (Vf) (Max) @ If	850 mV @ 3 A	850 mV @ 3 A	850 mV @ 3 A	800 mV @ 1 A	830 mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	100 µA @ 100 V	20 µA @ 100 V	20 µA @ 100 V	10 µA @ 100 V	85 µA @ 100 V
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-40°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123W	SOD-123W	SOD-123W	SOD-123W	DO-219AB
Product Status	Not For New Designs	Active	Active	Active	Active
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

The SS310LW and SS310LWH from Taiwan Semiconductor Corporation are parametric equivalents to the S310FA. Both parts maintain the 3A current rating, 100V reverse voltage, and 850 mV forward voltage drop at 3A. These parts are in active production status and carry identical RoHS3 compliance and MSL ratings. The SS310LW and SS310LWH differ only in packaging designation (standard versus high-temperature variant designation) but share identical electrical specifications and operating temperature range (-55°C ~ 150°C). Both are suitable for direct substitution in existing designs without circuit modification.

For Current-Limited Applications:

The SS110LWH from Taiwan Semiconductor Corporation is a functional substitute for applications where circuit current demand does not exceed 1A. This part maintains the 100V reverse voltage rating and fast recovery speed characteristics. The forward voltage drop is slightly lower (800 mV @ 1A) compared to the S310FA. This part is suitable only for low-current rectification circuits and cannot be used in applications requiring the full 3A capability.

For Alternative Package Consideration:

The V3FM10-M3/H from Vishay General Semiconductor is a parametric equivalent using the DO-219AB (SMF) surface mount package instead of SOD-123W. This part maintains the 3A current rating and 100V reverse voltage. The forward voltage drop is 830 mV @ 3A, which is within acceptable tolerance of the S310FA specification. The operating temperature range extends to 175°C maximum junction temperature, providing additional thermal margin. This part is suitable for applications where the DO-219AB package footprint is compatible with the PCB layout.

All substitute parts listed carry RoHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, matching the environmental and regulatory compliance profile of the S310FA.

Frequently Asked Questions (FAQ)

Q: Can SS310LW or SS310LWH be used as direct replacements for S310FA?

A: Yes. Both SS310LW and SS310LWH are parametric equivalents with identical electrical specifications (100V, 3A, 850 mV forward voltage drop) and operating temperature range (-55°C ~ 150°C). Both are in active production and carry the same RoHS3 compliance status. No circuit modification is required.

Q: What is the difference between SS310LW and SS310LWH?

A: Both parts share identical electrical specifications and operating temperature range. The designation difference reflects packaging or qualification variants from Taiwan Semiconductor Corporation. Both are suitable for the S310FA application.

Q: Can SS110LWH replace S310FA in all applications?

A: No. The SS110LWH is rated for 1A average rectified current, while the S310FA is rated for 3A. The SS110LWH can only be used in applications where the circuit current demand does not exceed 1A. For circuits requiring 3A capability, use SS310LW, SS310LWH, or V3FM10-M3/H.

Q: Is the V3FM10-M3/H package compatible with S310FA PCB layouts?

A: The V3FM10-M3/H uses DO-219AB (SMF) packaging, while the S310FA uses SOD-123W packaging. These are different surface mount packages with different footprints. PCB layout compatibility depends on whether the design accommodates the DO-219AB package dimensions. Verify footprint compatibility before selecting this substitute.

Q: Do all substitute parts meet automotive qualification requirements?

A: The S310FA carries AEC-Q101 automotive qualification. The substitute parts provided (SS310LW, SS310LWH, SS110LWH, V3FM10-M3/H) are listed as active components with RoHS3 compliance and REACH Unaffected status. Verify specific automotive qualification requirements with the component manufacturer if AEC-Q101 certification is mandatory for your application.

Q: What is the reverse leakage current difference between S310FA and the substitutes?

A: The S310FA specifies 100 µA @ 100V reverse leakage. The SS310LW and SS310LWH specify 20 µA @ 100V, the SS110LWH specifies 10 µA @ 100V, and the V3FM10-M3/H specifies 85 µA @ 100V. Lower reverse leakage current in substitute parts represents improved performance characteristics and does not affect compatibility.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (SS310LW, SS310LWH, SS110LWH, V3FM10-M3/H) are RoHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the S310FA compliance profile.

Q: What is the temperature operating range difference between S310FA and V3FM10-M3/H?

A: The S310FA operates from -55°C to 150°C junction temperature. The V3FM10-M3/H operates from -40°C to 175°C junction temperature. The V3FM10-M3/H provides extended high-temperature capability (25°C additional margin) but has a slightly higher minimum operating temperature (-40°C versus -55°C). For applications requiring -55°C minimum operation, use SS310LW or SS310LWH.

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