BYW178-TAP Equivalent & Substitute Parts

Part Overview

The BYW178-TAP is an 800 V, 3 A avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, housed in a SOD-64 axial package for through-hole mounting applications. This component is classified as Active and RoHS3 compliant. Substitute parts are identified when equivalent electrical performance is required across different package configurations, manufacturing sources, or when inventory constraints necessitate alternative sourcing while maintaining circuit functionality.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.9 V @ 3 A
Technology	Avalanche
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	60 ns
Current - Reverse Leakage @ Vr	1 µA @ 800 V
Mounting Type	Through Hole
Package / Case	SOD-64, Axial
Operating Temperature - Junction	-55°C ~ 175°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BYW178-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 3 A minimum
Mounting Type: Through Hole
Package / Case: Axial configuration

Secondary Compatibility Factors:

Technology type (Avalanche vs. Standard)
Forward voltage characteristics
Reverse recovery time performance
Operating temperature range
RoHS3 compliance status

Substitute parts identified in this reference maintain the core electrical specifications (800 V, 3 A) and through-hole axial mounting requirement. Variations in package designation (SOD-64 vs. DO-27 vs. DO-201AD), technology classification (Avalanche vs. Standard), and recovery characteristics are noted to enable informed selection based on circuit requirements and design constraints.

Parameter Comparison

Parameter	BYW178-TAP (Main)	1N5407-G	1N5407G	1N5407RLG	EGP30K	FR307GP-TP
Manufacturer	Vishay	Comchip Technology	Taiwan Semiconductor	onsemi	Fairchild Semiconductor	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	800 V	1000 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	1.9 V @ 3 A	1 V @ 3 A	1 V @ 3 A	1 V @ 3 A	1.7 V @ 3 A	1.3 V @ 3 A
Technology	Avalanche	Standard	Standard	Standard	Standard	Standard
Speed Classification	Fast Recovery ≤ 500 ns	Standard Recovery > 500 ns	Standard Recovery > 500 ns	Standard Recovery > 500 ns	Fast Recovery ≤ 500 ns	Fast Recovery ≤ 500 ns
Reverse Recovery Time (trr)	60 ns	Not specified	Not specified	Not specified	75 ns	500 ns
Current - Reverse Leakage @ Vr	1 µA @ 800 V	5 µA @ 800 V	5 µA @ 800 V	10 µA @ 800 V	5 µA @ 800 V	Not specified
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	SOD-64, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AA, DO-27, Axial	DO-201AD, Axial	DO-201AD, Axial
Operating Temperature - Junction	-55°C ~ 175°C	-65°C ~ 125°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Active	Active	Active	Not For New Designs	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

1N5407G (Taiwan Semiconductor Corporation) and 1N5407-G (Comchip Technology) are the preferred substitutes for the BYW178-TAP. Both parts maintain the 800 V, 3 A electrical specification and through-hole axial mounting configuration. These components are classified as Active and RoHS3 compliant. The 1N5407G variant offers the highest inventory availability (4462 Pcs) and operates across a -55°C to 150°C junction temperature range, providing compatibility with the BYW178-TAP's upper temperature limit of 175°C for most applications.

Secondary Substitutes (Conditional Use):

EGP30K (Fairchild Semiconductor) maintains 800 V, 3 A specifications with fast recovery characteristics (75 ns trr) comparable to the BYW178-TAP. This part is suitable for applications requiring fast switching performance and is available in bulk packaging (5092 Pcs inventory).

FR307GP-TP (Micro Commercial Co) provides elevated voltage rating (1000 V) with 3 A current capacity and fast recovery performance. This part is applicable in circuits where higher voltage margin is required, though the 1000 V rating exceeds the BYW178-TAP specification.

Not Recommended for New Designs:

1N5407RLG (onsemi) is classified as "Not For New Designs" and should not be selected for new circuit implementations, despite meeting the core electrical parameters.

Compliance Considerations:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, consistent with the BYW178-TAP classification. Moisture Sensitivity Level (MSL) is rated as 1 (Unlimited) across all active substitutes, indicating no special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1N5407G directly replace the BYW178-TAP in existing designs?

A: The 1N5407G maintains the critical electrical specifications (800 V, 3 A) and through-hole axial mounting configuration required for direct substitution. However, the package designation differs (DO-201AD vs. SOD-64). Physical dimensions and lead spacing should be verified against the PCB layout to confirm mechanical compatibility. The 1N5407G operates across -55°C to 150°C, which covers the BYW178-TAP's operating range for most applications.

Q: What is the difference between the BYW178-TAP's avalanche technology and the standard technology used in substitute parts?

A: The BYW178-TAP employs avalanche diode technology with a 60 ns reverse recovery time, classified as fast recovery. Most substitute parts (1N5407-G, 1N5407G, 1N5407RLG) use standard diode technology with recovery times exceeding 500 ns. The EGP30K and FR307GP-TP offer fast recovery characteristics (75 ns and 500 ns respectively) more closely aligned with the BYW178-TAP's performance profile. Technology selection should be based on circuit switching frequency and transient response requirements.

Q: Are there packaging considerations when selecting a substitute?

A: Yes. The BYW178-TAP uses SOD-64 packaging, while most substitutes employ DO-201AD or DO-27 packaging. All are through-hole axial configurations, but physical dimensions and lead spacing differ. The DO-201AD package is the most common among substitutes (1N5407-G, 1N5407G, EGP30K, FR307GP-TP). PCB hole spacing and component clearance must be verified before substitution to ensure mechanical fit.

Q: Which substitute offers the best inventory availability?

A: The 1N5407G (Taiwan Semiconductor Corporation) provides the highest inventory level at 4462 Pcs, followed by FR307GP-TP (5939 Pcs) and EGP30K (5092 Pcs). The 1N5407-G (Comchip Technology) offers 883 Pcs, and 1N5407RLG (onsemi) provides 1169 Pcs.

Q: Is the FR307GP-TP suitable as a substitute despite its 1000 V rating?

A: The FR307GP-TP's 1000 V rating exceeds the BYW178-TAP's 800 V specification and provides additional voltage margin in the circuit. This part is electrically compatible and maintains 3 A current capacity with fast recovery characteristics. However, the elevated voltage rating may introduce unnecessary cost or size considerations. Selection should be based on circuit voltage requirements and design margins.

Q: What compliance certifications should I verify when selecting a substitute?

A: All recommended active substitutes maintain RoHS3 compliance and REACH unaffected status, consistent with the BYW178-TAP. Moisture Sensitivity Level (MSL) is rated as 1 (Unlimited) for all active parts, indicating no special storage or handling requirements. The 1N5407RLG is classified as "Not For New Designs" and should be avoided for new circuit implementations despite meeting electrical specifications.

Q: How do forward voltage characteristics affect substitution?

A: The BYW178-TAP specifies 1.9 V forward voltage at 3 A, while most substitutes (1N5407-G, 1N5407G, 1N5407RLG) specify 1 V at 3 A. The EGP30K specifies 1.7 V, and FR307GP-TP specifies 1.3 V. Lower forward voltage reduces power dissipation and heat generation. Circuit designs with tight thermal budgets or high-frequency switching may benefit from substitutes with lower forward voltage, while designs with adequate thermal management can accommodate the BYW178-TAP's higher forward voltage specification.

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