Equivalent & Substitute Parts for TZX33B-TR Zener Diode

Part Overview

The Vishay General Semiconductor TZX33B-TR is an active Zener diode with a nominal Zener voltage of 33 V, rated for 500 mW power dissipation, packaged in DO-204AH (DO-35) for through-hole mounting. It is designed for applications requiring precise voltage regulation and is qualified to automotive-grade (AEC-Q101). Alternative part selection may be necessary due to availability, inventory requirements, or specific electrical/mechanical parameter matching.

Substiute Parts

TZX33B-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 10727TZX33B-TR Datasheet

Current PartRFQ

1N5257B TR PBFREE

Central Semiconductor CorpIn Stock: 53161N5257B TR PBFREE Datasheet

MFR RecommendedRFQ

NZX33B,133

Nexperia USA Inc.In Stock: 70438NZX33B,133 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute Zener diodes must strictly match the essential electrical and mechanical parameters to ensure form, fit, and functional equivalence. The key parameters governing substitute selection for the TZX33B-TR within the Diodes, Zener category include: nominal Zener voltage, maximum power dissipation, package and mounting type, impedance, reverse leakage current, forward voltage at specified current, operating temperature range, RoHS status, MSL, part status, and REACH status.

Parameter Comparison

Engineering Selection Recommendations

The main part TZX33B-TR and its substitutes 1N5257B TR PBFREE and NZX33B,133 are all active, RoHS3 compliant, have MSL 1 (Unlimited), and REACH unaffected status. Selection can be made on the basis of matching part status, required environmental compliance certifications, and guaranteed electrical parameters as listed.

Frequently Asked Questions (FAQ)

Q1: What are the critical electrical parameters when substituting Zener diodes in this category? A1: Nominal Zener voltage (Vz), maximum power dissipation, impedance, reverse leakage current, and forward voltage at a specified current are essential for functional equivalence.

Q2: How important is package and mounting type for Zener diode substitution? A2: The package and mounting type (DO-204AH, DO-35, Through Hole) must match to ensure mechanical compatibility and correct fitment in existing designs.

Q3: Are the substitute parts compliant with RoHS and REACH regulations? A3: All listed alternatives are ROHS3 compliant and REACH unaffected, ensuring regulatory compliance.

Q4: Can differences in impedance or tolerance affect substitution? A4: Provided parameters must strictly match or be within the specified limits for the application. Only those impedance and tolerance values explicitly listed are suitable for direct substitution.

Q5: Do part status and inventory affect selection criteria? A5: Only active parts are considered suitable. Inventory levels may influence procurement strategies but are not a technical criteria.

Q6: Are all substitute Zener diodes compatible across operating temperature ranges? A6: Substitute devices meet or exceed the operating temperature range requirements specified for the main part.

Q7: Is qualification grade (e.g., AEC-Q101 automotive) considered in substitution? A7: Qualification grade is referenced if explicitly provided, but only AEC-Q101 status for the main part is listed; substitutes must use the parameters as stated.