BZX85B82-TAP Zener Diode Equivalent & Substitute Parts

Part Overview

The BZX85B82-TAP is an 82 V, 1.3 W through-hole zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-204AL (DO-41) axial package. This component is classified as obsolete, though 871 pieces remain in stock as new original inventory. The part carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant.

Due to the obsolete status of the BZX85B82-TAP, identification of equivalent and substitute parts is necessary for design continuity, procurement planning, and long-term supply chain management. Substitute parts must maintain electrical compatibility across the critical parameters of zener voltage, power dissipation, impedance, and package form factor.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	82	V
Tolerance	±2%	—
Power - Max	1.3	W
Impedance (Max)	200	Ohms
Current - Reverse Leakage @ Vr	500 nA @ 62 V	—
Operating Temperature	175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL (DO-41)	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the BZX85B82-TAP is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Zener voltage: 82 V nominal
Package form factor: DO-204AL (DO-41) through-hole axial configuration
Impedance (Max): 200 Ohms or lower
Operating temperature range: minimum 175°C upper limit

Secondary Compatibility Factors:

Power dissipation rating: 1.3 W or greater
Tolerance: ±2% or tighter preferred for precision applications
Reverse leakage current: specification-dependent on application requirements

Substitute parts are grouped into two categories:

Category 1: Direct Parametric Equivalents (Identical Specifications) Parts that match all primary criteria with identical or superior electrical characteristics and the same through-hole DO-41 package.

Category 2: Functional Equivalents (Acceptable Substitutes) Parts that maintain 82 V zener voltage and DO-41 package but with variations in power rating, tolerance, or leakage current specifications. These parts are suitable for applications where the specific parameter variance does not impact circuit performance.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Package	Mounting	Status
BZX85B82-TAP	Vishay	82 V	±2%	1.3 W	200 Ω	500 nA @ 62 V	DO-204AL	Through Hole	Obsolete
BZX85B82-TR	Vishay	82 V	±2%	1.3 W	200 Ω	500 nA @ 62 V	DO-204AL	Through Hole	Obsolete
1N3042B-1	Microchip	82 V	±5%	1 W	200 Ω	10 µA @ 62.2 V	DO-204AL	Through Hole	Active
1N4762G	Microsemi	82 V	±10%	1 W	200 Ω	5 µA @ 62.2 V	DO-204AL	Through Hole	Active
1N4762AG	Microsemi	82 V	±5%	1 W	200 Ω	5 µA @ 62.2 V	DO-204AL	Through Hole	Active
1N5947AG	Microsemi	82 V	±10%	1.25 W	160 Ω	1 µA @ 62.2 V	DO-204AL	Through Hole	Active
1N5947CG	Microsemi	82 V	±2%	1.25 W	160 Ω	1 µA @ 62.2 V	DO-204AL	Through Hole	Active
1N5947DG	Microsemi	82 V	±1%	1.25 W	160 Ω	1 µA @ 62.2 V	DO-204AL	Through Hole	Active

Engineering Selection Recommendations

BZX85B82-TR (Vishay)

This part is the direct parametric equivalent to the BZX85B82-TAP, differing only in packaging format (Tape & Reel versus individual packaging). Both parts share identical electrical specifications: 82 V nominal zener voltage, ±2% tolerance, 1.3 W power rating, and 200 Ohm maximum impedance. The BZX85B82-TR is also classified as obsolete but carries 1,327 pieces in stock. Selection of this part is appropriate when packaging format compatibility with automated assembly processes is required.

1N5947CG (Microsemi)

This part offers the closest active-status alternative with matching ±2% tolerance and superior electrical characteristics. The 1N5947CG provides 1.25 W power dissipation (compared to 1.3 W), lower impedance (160 Ohms versus 200 Ohms), and significantly reduced reverse leakage current (1 µA versus 500 nA). The part is active and carries 673 pieces in stock. This selection is recommended for new designs and long-term supply continuity.

1N5947DG (Microsemi)

This part provides the tightest tolerance specification at ±1%, exceeding the original ±2% tolerance of the BZX85B82-TAP. It shares the same 82 V zener voltage, 1.25 W power rating, and DO-204AL package. The 1N5947DG is active with 747 pieces in stock. Selection is appropriate for precision voltage regulation applications requiring superior tolerance performance.

1N4762AG (Microsemi)

This part maintains the 82 V zener voltage and DO-204AL package with ±5% tolerance. Power dissipation is rated at 1 W, which is lower than the original 1.3 W specification. The part is active with 919 pieces in stock. Selection is suitable for applications where the reduced power rating does not constrain circuit operation.

1N3042B-1 (Microchip)

This part provides 82 V zener voltage in the DO-204AL package with ±5% tolerance and 1 W power rating. The part is active with 726 pieces in stock. However, this part carries RoHS non-compliant status, which may restrict use in regulated industries or applications with RoHS compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the BZX85B82-TAP be directly replaced with the BZX85B82-TR?

A: Yes. Both parts are manufactured by Vishay and share identical electrical specifications: 82 V nominal zener voltage, ±2% tolerance, 1.3 W power dissipation, and 200 Ohm maximum impedance. The difference is packaging format only (Tape & Reel versus standard packaging). Direct substitution is valid for through-hole applications.

Q: What is the primary difference between the BZX85B82-TAP and the 1N5947CG?

A: The primary differences are product status and impedance characteristics. The BZX85B82-TAP is obsolete with 1.3 W power rating and 200 Ohm impedance, while the 1N5947CG is active with 1.25 W power rating and 160 Ohm impedance. Both maintain 82 V zener voltage and ±2% tolerance. The 1N5947CG offers lower impedance and is recommended for new designs.

Q: Are all substitute parts available in the same DO-41 package?

A: Yes. All substitute parts listed in this reference are available in the DO-204AL (DO-41) through-hole axial package configuration. The 1N4762AUR is an exception, as it is supplied in the DO-213AB (MELF) surface-mount package and is not suitable for through-hole applications.

Q: What tolerance specification should I select for precision voltage regulation?

A: The 1N5947DG offers ±1% tolerance, the tightest specification available among active substitutes. The 1N5947CG provides ±2% tolerance, matching the original BZX85B82-TAP specification. Both parts are suitable for precision applications. The 1N4762AG and 1N3042B-1 offer ±5% tolerance, and the 1N4762G offers ±10% tolerance, which are appropriate for general-purpose voltage regulation where tighter tolerance is not required.

Q: Can I use a substitute part with lower power dissipation rating?

A: Substitution with lower power dissipation is valid only if circuit analysis confirms that the actual power dissipation in the application does not exceed the substitute part's rating. The 1N4762AG and 1N3042B-1 are rated at 1 W, compared to the original 1.3 W specification. Use of these parts requires verification that circuit conditions do not demand the full 1.3 W dissipation capability.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current affects circuit performance in high-impedance applications and precision voltage reference circuits. The BZX85B82-TAP specifies 500 nA at 62 V. The 1N5947 series parts (1N5947AG, 1N5947CG, 1N5947DG) offer significantly lower leakage at 1 µA at 62.2 V, providing superior performance in sensitive applications. The 1N4762 series parts offer intermediate leakage specifications (5 µA), suitable for general-purpose applications.

Q: Are there RoHS compliance considerations for substitute selection?

A: The original BZX85B82-TAP is ROHS3 compliant. The 1N5947 series parts (1N5947AG, 1N5947CG, 1N5947DG) and 1N4762 series parts are RoHS non-compliant. The 1N3042B-1 is also RoHS non-compliant. Applications subject to RoHS compliance requirements should prioritize the BZX85B82-TR, which maintains ROHS3 compliance status.

Q: What is the operating temperature range for substitute parts?

A: The original BZX85B82-TAP specifies a maximum operating temperature of 175°C. The 1N5947 series and 1N4762 series parts extend the operating range to -65°C to 175°C, providing superior low-temperature performance. The 1N3042B-1 specifies -55°C to 175°C. All parts meet or exceed the original upper temperature limit of 175°C.

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