BAW76 Equivalent & Substitute Parts

Part Overview

The BAW76 is a general-purpose rectifier diode manufactured by onsemi, rated for 75 V DC reverse voltage and 300 mA average rectified current in a DO-35 through-hole package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Identifying equivalent and substitute parts ensures design continuity and maintains supply chain reliability for applications requiring this diode's electrical and mechanical characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io)	300	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	V
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	100 nA @ 50 V	nA
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-
Operating Temperature - Junction (Max)	175	°C

Substitute Part Grouping Explanation

Substitution of the BAW76 is determined by the following critical parameters:

Voltage Rating (Vr): The substitute must support a minimum DC reverse voltage of 75 V to maintain circuit protection and reliability.

Current Rating (Io): The substitute must support a minimum average rectified current of 300 mA to handle the intended load without thermal stress.

Package Type: All substitutes must use the DO-35 through-hole axial package to ensure mechanical compatibility with existing PCB layouts and assembly processes.

Speed Characteristics: The BAW76 exhibits fast recovery characteristics (≤ 500 ns for currents > 200 mA). Substitutes with equivalent or superior speed performance maintain switching behavior consistency.

Reverse Recovery Time (trr): The 4 ns specification ensures minimal charge storage effects in switching applications.

Temperature Rating: The 175°C maximum junction temperature establishes the thermal operating envelope.

Substitute parts are grouped into two categories:

Direct Equivalents: Parts meeting or exceeding all critical parameters (voltage, current, package, speed, temperature).

Parametric Equivalents: Parts meeting voltage and current requirements with compatible package and thermal ratings, though with minor variations in secondary parameters such as reverse leakage current or capacitance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA/µA]	Package	Temp (Max) [°C]	Status
BAW76	onsemi	75	300	1 @ 100 mA	4	100 nA @ 50 V	DO-35	175	Obsolete
1N4148-TAP	Vishay General Semiconductor	75	300	1 @ 10 mA	8	25 nA @ 20 V	DO-35	150	Active
BAW62	Fairchild Semiconductor	75	300	1 @ 100 mA	4	5 µA @ 75 V	DO-35	175	Active
BAW76-TR	Vishay General Semiconductor	50	300	1 @ 100 mA	4	100 nA @ 50 V	DO-35	175	Active
1N4148-G	Comchip Technology	75	150	1 @ 10 mA	-	5 µA @ 75 V	DO-35	200	Obsolete
1N914B	Taiwan Semiconductor Corporation	100	150	1 @ 100 mA	4	5 µA @ 75 V	DO-35	150	Active

Engineering Selection Recommendations

Primary Substitute: 1N4148-TAP (Vishay General Semiconductor)

The 1N4148-TAP is the recommended direct substitute for the BAW76. It matches the 75 V voltage rating and 300 mA current rating, maintains the DO-35 package format, and is classified as active product status. This part is RoHS3 compliant and carries REACH unaffected status. The slightly higher reverse recovery time (8 ns versus 4 ns) and lower maximum junction temperature (150°C versus 175°C) represent minor deviations that do not preclude substitution in standard rectification applications. The 1N4148-TAP is available in high inventory quantities (300,200 pieces), ensuring supply continuity.

Secondary Substitute: BAW62 (Fairchild Semiconductor)

The BAW62 provides an exact match to the BAW76 across all critical parameters: 75 V voltage rating, 300 mA current rating, 4 ns reverse recovery time, and 175°C maximum junction temperature. The BAW62 is active product status with RoHS3 compliance and REACH unaffected designation. This part is suitable for applications requiring identical thermal and switching characteristics. Inventory availability is substantial (71,064 pieces).

Conditional Substitute: BAW76-TR (Vishay General Semiconductor)

The BAW76-TR is a variant of the BAW76 base product manufactured by Vishay. It maintains the 300 mA current rating, 4 ns reverse recovery time, and 175°C maximum junction temperature. However, the voltage rating is reduced to 50 V, making this substitute applicable only to circuits where the maximum reverse voltage does not exceed 50 V. This part carries AEC-Q101 automotive qualification and is active product status. Use this substitute only when circuit voltage requirements are confirmed to be 50 V or lower.

Not Recommended: 1N4148-G and 1N914B

The 1N4148-G and 1N914B both feature reduced current ratings (150 mA versus 300 mA), making them unsuitable for applications requiring the full 300 mA capacity of the BAW76. These parts may be used only in circuits where the actual operating current does not exceed 150 mA.

Frequently Asked Questions (FAQ)

Q: Can the 1N4148-TAP directly replace the BAW76 in all applications?

A: The 1N4148-TAP is electrically compatible with the BAW76 for standard rectification applications. Both parts share the same 75 V voltage rating, 300 mA current rating, and DO-35 package. The 1N4148-TAP has a slightly longer reverse recovery time (8 ns versus 4 ns) and lower maximum junction temperature (150°C versus 175°C). In applications operating near the thermal or switching speed limits of the original design, these differences should be evaluated against circuit requirements.

Q: What is the difference between the BAW62 and the BAW76?

A: The BAW62 and BAW76 are parametrically equivalent parts with identical voltage (75 V), current (300 mA), reverse recovery time (4 ns), and maximum junction temperature (175°C) ratings. The primary difference is manufacturer: BAW76 is from onsemi (obsolete status), while BAW62 is from Fairchild Semiconductor (active status). The BAW62 is suitable for direct substitution where supply continuity is required.

Q: Why is the BAW76-TR not a complete substitute?

A: The BAW76-TR has a reduced voltage rating of 50 V compared to the BAW76's 75 V rating. This part is suitable only for circuits where the maximum reverse voltage does not exceed 50 V. If the circuit design requires 75 V reverse voltage protection, the BAW76-TR cannot be used.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All substitute parts listed are available in the DO-35 through-hole axial package, ensuring mechanical compatibility with existing PCB layouts and assembly equipment. Packaging variations (such as cut tape versus bulk) do not affect electrical performance or physical fit.

Q: What compliance certifications should I verify for substitute parts?

A: All recommended substitute parts carry RoHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the original BAW76. The BAW76-TR additionally carries AEC-Q101 automotive qualification, which may be relevant for automotive applications.

Q: Can I use the 1N914B as a substitute?

A: The 1N914B is not recommended as a direct substitute due to its reduced current rating of 150 mA versus the BAW76's 300 mA. Use the 1N914B only in applications where the actual operating current does not exceed 150 mA. The 1N914B does offer a higher voltage rating (100 V) and is active product status.

Q: What is the significance of reverse recovery time in selecting a substitute?

A: Reverse recovery time (trr) determines how quickly the diode transitions from conducting to blocking state. The BAW76 specifies 4 ns. Substitutes with longer recovery times (such as the 1N4148-TAP at 8 ns) may exhibit slightly different switching behavior in high-frequency applications. For standard rectification at line frequencies or lower switching rates, this difference is typically negligible.

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