BZX85B22-TAP Equivalent & Substitute Parts

Part Overview

The BZX85B22-TAP is an automotive-grade Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component is rated for 22 V nominal Zener voltage with 1.3 W maximum power dissipation in a DO-41 axial package. The device is AEC-Q101 qualified and RoHS3 compliant, making it suitable for automotive applications requiring voltage regulation and transient protection.

Substitute parts are necessary when the primary component experiences supply constraints, extended lead times, or when design flexibility permits selection from multiple qualified manufacturers while maintaining electrical and mechanical compatibility.

Substiute Parts

BZX85B22-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 1169BZX85B22-TAP Datasheet

Current PartRFQ

1N4748A

Lumimax Optoelectronic TechnologyIn Stock: 107331N4748A Datasheet

MFR RecommendedRFQ

1N4748A-T50A

onsemiIn Stock: 10441N4748A-T50A Datasheet

MFR RecommendedRFQ

1N4748ATR

onsemiIn Stock: 219881N4748ATR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZX85B22-TAP is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Zener voltage must be 22 V nominal
• Package and mounting type must be DO-41 axial through-hole
• Operating temperature range must encompass the application requirements
• RoHS and REACH compliance status must match or exceed the original specification

Acceptable Parameter Variations:

• Tolerance: Original specification ±2%; substitutes with ±5% tolerance are acceptable as they maintain the 22 V nominal voltage within functional operating margins
• Power rating: Original 1.3 W; substitutes rated at 1 W are acceptable for applications not requiring maximum power dissipation capability
• Impedance: Original 25 Ohms maximum; substitutes at 23 Ohms maximum are acceptable as lower impedance provides improved performance characteristics
• Reverse leakage current: Original 500 nA @ 16 V; substitutes at 5 µA @ 16.7 V represent a measurable increase but remain within acceptable limits for voltage regulation applications
• Operating temperature: Original -55°C to 175°C; substitutes with -65°C to 200°C provide extended range capability

Qualification and Compliance:

• Automotive-grade qualification (AEC-Q101) is specific to the original part; substitute parts without automotive qualification are functionally compatible but not suitable for automotive applications requiring AEC-Q101 certification
• All listed substitutes maintain RoHS3 compliance and REACH unaffected status

Parameter Comparison

Engineering Selection Recommendations

For Automotive Applications (AEC-Q101 Required): The BZX85B22-TAP is the only part in this group with AEC-Q101 automotive qualification. Applications requiring automotive-grade certification must use the original BZX85B22-TAP or source an alternative automotive-qualified 22 V Zener diode from another manufacturer.

For General Industrial and Commercial Applications: The 1N4748A variants from onsemi (1N4748A-T50A and 1N4748ATR) are functionally compatible substitutes. Both maintain RoHS3 compliance and REACH unaffected status. The primary differences are packaging format (Tape & Box versus Cut Tape) and inventory availability.

Packaging and Procurement Considerations:

• BZX85B22-TAP: Tape & Box packaging, 1148 units in stock
• 1N4748A-T50A (onsemi): Tape & Box packaging, 1012 units in stock
• 1N4748ATR (onsemi): Cut Tape packaging, 21963 units in stock
• 1N4748A (Lumimax): Packaging format not specified, 10645 units in stock

Power Dissipation Derating: Applications designed for the full 1.3 W power capability of the BZX85B22-TAP must account for the 1 W maximum rating of substitute parts. Thermal analysis is required to confirm adequate heat dissipation at reduced power ratings.

Tolerance and Voltage Regulation: The BZX85B22-TAP offers ±2% tolerance compared to ±5% for substitute parts. Applications requiring tighter voltage regulation should retain the original part or confirm that ±5% tolerance meets circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can I use 1N4748A-T50A as a direct replacement for BZX85B22-TAP in an automotive application?

A: The 1N4748A-T50A is electrically and mechanically compatible with the BZX85B22-TAP for through-hole mounting in DO-41 packages. However, it lacks AEC-Q101 automotive qualification. Use this substitute only in non-automotive applications or where automotive qualification is not required by design specifications.

Q: What is the difference between 1N4748A-T50A and 1N4748ATR?

A: Both parts are manufactured by onsemi and share identical electrical specifications (22 V nominal, 1 W power, ±5% tolerance). The primary difference is packaging format: 1N4748A-T50A is supplied in Tape & Box format, while 1N4748ATR is supplied in Cut Tape format. Selection depends on procurement and assembly requirements.

Q: Why does the BZX85B22-TAP have higher power rating (1.3 W) than the substitute parts (1 W)?

A: The BZX85B22-TAP is rated for 1.3 W maximum power dissipation, while 1N4748A variants are rated for 1 W. This difference reflects different design specifications from the respective manufacturers. Applications operating near maximum power limits must confirm that 1 W rating is sufficient for the intended circuit.

Q: Are all listed parts RoHS compliant?

A: Yes. The BZX85B22-TAP is ROHS3 compliant. The 1N4748A-T50A and 1N4748ATR are ROHS3 compliant. The 1N4748A from Lumimax is RoHS compliant. All parts maintain REACH unaffected status.

Q: What is the impact of the ±5% tolerance in substitute parts compared to the ±2% tolerance of the original?

A: The BZX85B22-TAP maintains ±2% tolerance around 22 V nominal (21.56 V to 22.44 V). Substitute parts with ±5% tolerance operate within 20.9 V to 23.1 V. For voltage regulation circuits, confirm that the wider tolerance band meets circuit performance requirements before substitution.

Q: Can I use these parts interchangeably in the same circuit board?

A: Yes, for non-automotive applications. All listed parts use identical DO-41 axial through-hole packages and share the same 22 V nominal Zener voltage. Mechanical and electrical compatibility is confirmed. Verify that power dissipation requirements do not exceed 1 W for substitute parts.

Q: What is the difference in reverse leakage current between the original and substitute parts?

A: The BZX85B22-TAP specifies 500 nA reverse leakage at 16 V. Substitute parts specify 5 µA at 16.7 V. This represents a 10-fold increase in leakage current. For applications sensitive to leakage current (such as precision voltage references), evaluate whether this difference affects circuit performance.