TZX8V2B-TAP Equivalent & Substitute Parts

Part Overview

The TZX8V2B-TAP is an 8.2 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-35 (DO-204AH) through-hole package. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and operational specifications are required due to supply constraints, design revisions, or manufacturing discontinuation of the primary component.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	8.2	V
Power - Maximum	500	mW
Impedance (Maximum)	20	Ohms
Voltage - Forward (Maximum) @ If	1.5 V @ 200 mA	V @ mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the TZX8V2B-TAP is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 8.2 V nominal
Maximum power dissipation: 500 mW
Package type: DO-35 (DO-204AH) through-hole axial configuration
Operating temperature range: minimum -65°C to 175°C
Forward voltage and reverse leakage characteristics within acceptable operational limits

Secondary Compliance Considerations:

RoHS status (ROHS3 preferred for new designs)
REACH compliance status
Product status (Active)
Moisture sensitivity level

All substitute parts listed maintain the core electrical specifications required for direct functional replacement in 8.2 V Zener diode applications. Variations in impedance, forward voltage, and reverse leakage are within acceptable tolerances for standard voltage regulation and transient suppression circuits.

Parameter Comparison

Parameter	TZX8V2B-TAP (Main)	1N5237B	1N5237B TR PBFREE	1N5237BTR	1N756A BK PBFREE	BZX79C8V2-T50A
Manufacturer	Vishay	Microchip	Central Semiconductor	Fairchild	Central Semiconductor	Fairchild
Voltage - Zener (Nom)	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V	8.2 V
Tolerance	—	±5%	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	20 Ohms	8 Ohms	8 Ohms	8 Ohms	8 Ohms	15 Ohms
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 100 mA
Operating Temperature	-65 to 175°C	-65 to 175°C	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Preferred):

1N5237B TR PBFREE and 1N756A BK PBFREE are the preferred substitutes for new designs. Both components maintain ROHS3 compliance, matching the environmental and regulatory status of the TZX8V2B-TAP. The 1N5237B TR PBFREE offers extended operating temperature range (-65°C to 200°C) and lower forward voltage (1.1 V @ 200 mA), providing improved thermal performance in high-current applications. The 1N756A BK PBFREE provides superior reverse leakage characteristics (100 nA @ 1 V) suitable for precision voltage reference circuits.

Secondary Substitutes (Conditional):

1N5237BTR (Fairchild) and BZX79C8V2-T50A (Fairchild) are functionally equivalent but lack specified RoHS compliance documentation. These components are suitable for applications where RoHS compliance is not a design requirement. The 1N5237BTR provides standard performance characteristics with extended temperature range. The BZX79C8V2-T50A offers intermediate impedance (15 Ohms) and lower reverse leakage (700 nA @ 5 V).

Not Recommended:

1N5237B (Microchip) is not recommended for new designs due to RoHS non-compliance status, despite equivalent electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can the TZX8V2B-TAP be directly replaced with any of the listed substitutes?

A: All listed substitute parts maintain the core electrical specifications (8.2 V nominal, 500 mW power rating) and identical DO-35 package configuration. Direct mechanical and electrical substitution is supported. However, RoHS compliance status should be verified against design requirements before selection.

Q: What is the significance of the impedance variation among substitute parts?

A: Impedance (Zzt) affects the dynamic response of the Zener diode in transient suppression and voltage regulation circuits. The TZX8V2B-TAP specifies 20 Ohms maximum impedance, while most substitutes specify 8 Ohms. Lower impedance provides faster transient response. The BZX79C8V2-T50A at 15 Ohms offers a middle ground. Selection depends on circuit bandwidth requirements.

Q: Are there temperature range differences that affect substitution?

A: The TZX8V2B-TAP operates from -65°C to 175°C. Most substitute parts extend to 200°C maximum operating temperature. This extended range does not prevent substitution but provides additional thermal margin in high-temperature applications. Designs operating within the -65°C to 175°C window are fully compatible with all substitutes.

Q: What packaging options are available for these Zener diodes?

A: All listed parts are supplied in DO-35 (DO-204AH) through-hole axial package configuration. Packaging variations among substitutes (Bulk, Cut Tape, Tape & Box) refer to supply format only and do not affect electrical or mechanical compatibility. Component selection should consider procurement and assembly requirements.

Q: How do forward voltage differences impact circuit design?

A: Forward voltage specifications range from 1.1 V to 1.5 V at 200 mA. These variations are within typical circuit tolerance margins for voltage regulation and protection applications. Forward voltage becomes significant only in precision current-limiting or biasing circuits where voltage drop directly affects circuit performance. Standard applications tolerate the specified range without design modification.

Q: Is AEC-Q101 qualification required for all applications?

A: The TZX8V2B-TAP carries AEC-Q101 automotive qualification. Substitute parts do not specify this qualification. AEC-Q101 is required for automotive and safety-critical applications. Non-automotive applications may use substitutes without this qualification. Verify qualification requirements against design specifications before component selection.

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