BZX85B100-TAP Equivalent & Substitute Parts

Part Overview

The BZX85B100-TAP is a 100 V, 1.3 W Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-204AL (DO-41) axial through-hole package. This component is classified as obsolete, indicating discontinuation from the original manufacturer. The part carries AEC-Q101 automotive qualification and ROHS3 compliance. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary for ongoing design support, production continuity, and new system implementations.

Key Parameters

Parameter	BZX85B100-TAP
Voltage - Zener (Nom)	100 V
Power - Max	1.3 W
Tolerance	±2%
Impedance (Max)	350 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 75 V
Operating Temperature	175°C
Package / Case	DO-204AL, DO-41, Axial
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the BZX85B100-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 100 V nominal
Package type: DO-204AL (DO-41) axial through-hole
Mounting configuration: Through-hole

Secondary Compatibility Factors:

Power dissipation rating (1.3 W nominal; substitutes range from 1 W to 2 W)
Voltage tolerance (original ±2%; substitutes range from ±1% to ±20%)
Impedance characteristics (original 350 Ohms; substitutes range from 175 to 350 Ohms)
Reverse leakage current specifications
Operating temperature range

All substitute parts listed maintain the 100 V zener voltage specification and DO-204AL package format, ensuring mechanical and electrical compatibility. Variations in power rating, tolerance, and impedance reflect different performance grades available from active manufacturers. Parts with higher power ratings (1.25 W, 2 W) provide enhanced thermal margin. Parts with tighter tolerance (±1%, ±2%) offer improved voltage regulation accuracy compared to wider tolerance variants (±5%, ±10%, ±20%).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Reverse Leakage @ Vr	Operating Temp	Product Status	RoHS Status
BZX85B100-TAP	Vishay	100 V	1.3 W	±2%	350 Ohms	500 nA @ 75 V	175°C	Obsolete	ROHS3
1N4764 G	Microsemi	100 V	1 W	±10%	350 Ohms	5 µA @ 76 V	-65°C ~ 175°C	Active	Non-compliant
1N5949AG	Microsemi	100 V	1.25 W	±10%	250 Ohms	1 µA @ 76 V	-65°C ~ 175°C	Active	Non-compliant
1N5949DG	Microsemi	100 V	1.25 W	±1%	250 Ohms	1 µA @ 76 V	-65°C ~ 175°C	Active	Non-compliant
2EZ100D/TR8	Microsemi	100 V	2 W	±20%	175 Ohms	500 nA @ 76 V	-65°C ~ 150°C	Active	Non-compliant
2EZ100D10E3/TR12	Microsemi	100 V	2 W	±10%	175 Ohms	500 nA @ 76 V	-65°C ~ 150°C	Active	ROHS3
2EZ100D2/TR12	Microsemi	100 V	2 W	±2%	175 Ohms	500 nA @ 76 V	-65°C ~ 150°C	Active	Non-compliant
2EZ100D2E3/TR12	Microsemi	100 V	2 W	±2%	175 Ohms	500 nA @ 76 V	-65°C ~ 150°C	Active	ROHS3
2EZ100D2E3/TR8	Microsemi	100 V	2 W	±2%	175 Ohms	500 nA @ 76 V	-65°C ~ 150°C	Active	ROHS3
2EZ100D5	Microsemi	100 V	2 W	±5%	175 Ohms	500 nA @ 76 V	-65°C ~ 150°C	Active	Non-compliant
2EZ100D5/TR8	Microsemi	100 V	2 W	±5%	175 Ohms	500 nA @ 76 V	-65°C ~ 150°C	Active	Non-compliant

Engineering Selection Recommendations

For ROHS3 Compliance Requirement: Select from the following active parts that maintain ROHS3 compliance:

2EZ100D10E3/TR12 (2 W, ±10% tolerance)
2EZ100D2E3/TR12 (2 W, ±2% tolerance)
2EZ100D2E3/TR8 (2 W, ±2% tolerance)

These parts provide direct compliance alignment with the original BZX85B100-TAP specification and are suitable for applications requiring regulatory compliance documentation.

For Voltage Regulation Accuracy: Parts with ±2% tolerance match the original specification:

1N5949DG (1.25 W, ±1% tolerance) — tightest tolerance available
2EZ100D2/TR12 (2 W, ±2% tolerance)
2EZ100D2E3/TR12 (2 W, ±2% tolerance, ROHS3)
2EZ100D2E3/TR8 (2 W, ±2% tolerance, ROHS3)

For Thermal Margin Enhancement: Parts rated at 2 W power dissipation provide 54% higher thermal capacity than the original 1.3 W specification:

2EZ100D/TR8 through 2EZ100D5/TR8 series (all 2 W rated)

For Lower Power Applications: If thermal constraints limit power dissipation:

1N4764 G (1 W, ±10% tolerance) — lowest power option
1N5949AG (1.25 W, ±10% tolerance) — intermediate power option

All substitute parts are active products from Microsemi Corporation, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can I directly replace BZX85B100-TAP with any of the listed substitutes?

A: All listed substitutes share the same 100 V zener voltage and DO-204AL through-hole package, enabling direct mechanical and electrical substitution. However, differences in power rating, tolerance, and compliance status require verification against your specific application requirements.

Q: What is the difference between 1N5949AG and 1N5949DG?

A: Both parts are identical except for tolerance specification. The 1N5949AG has ±10% tolerance, while 1N5949DG has ±1% tolerance. The 1N5949DG provides tighter voltage regulation at the cost of stricter manufacturing controls.

Q: Why do the 2EZ100 series parts have higher power ratings than the original?

A: The 2EZ100 series is rated at 2 W maximum power dissipation compared to the original 1.3 W. This higher rating provides additional thermal margin and allows operation at higher current levels while maintaining the same 100 V zener voltage. The higher power rating does not affect compatibility in applications designed for the original 1.3 W part.

Q: Are there RoHS compliance differences I should consider?

A: The original BZX85B100-TAP is ROHS3 compliant. Among substitutes, only 2EZ100D10E3/TR12, 2EZ100D2E3/TR12, and 2EZ100D2E3/TR8 carry ROHS3 compliance. Other substitutes are RoHS non-compliant. Select ROHS3-compliant parts for applications requiring regulatory compliance documentation.

Q: What does the impedance (Zzt) parameter mean for substitution?

A: Impedance (Zzt) affects the dynamic regulation characteristics of the zener diode. The original part specifies 350 Ohms maximum. Substitute parts with lower impedance (175 Ohms in the 2EZ100 series) provide better voltage regulation under varying load conditions. This is a performance enhancement, not a compatibility issue.

Q: Can I use a substitute with wider tolerance (±20%) in place of the ±2% original?

A: Wider tolerance parts (such as 2EZ100D/TR8 at ±20%) are electrically compatible but provide less precise voltage regulation. Use wider tolerance substitutes only if your circuit design accommodates the full tolerance band. For applications requiring tight voltage control, select parts with ±2% or ±1% tolerance.

Q: What is the significance of the operating temperature range difference?

A: The original part specifies 175°C maximum operating temperature. All Microsemi substitutes specify -65°C to 175°C or -65°C to 150°C ranges. The lower temperature limit does not affect compatibility. The 2EZ100 series maximum of 150°C is still adequate for most applications; verify if your design requires operation above 150°C.

Q: How do I choose between different 2EZ100 variants?

A: Selection depends on three factors: (1) RoHS compliance requirement — choose D2E3 variants for ROHS3; (2) tolerance requirement — D2 and D2E3 variants offer ±2% matching the original; (3) packaging preference — TR8 and TR12 designations indicate different tape reel configurations for automated assembly. Electrical performance is identical across these variants.

Q: Is the reverse leakage current difference significant?

A: The original part specifies 500 nA @ 75 V. Substitutes range from 500 nA to 5 µA @ 76 V. Lower leakage (500 nA, 1 µA) indicates better performance in high-impedance circuits. Higher leakage (5 µA) is acceptable for most standard applications. Verify leakage specifications only if your circuit operates in high-impedance conditions.

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