Equivalent & Substitute Parts Reference: 1N6311

Part Overview

The Microchip Technology 1N6311 is a Zener diode designed for voltage regulation applications. It features a nominal Zener voltage of 3 V, a maximum power dissipation rating of 500 mW, and is packaged in the DO-35 through-hole format. This diode maintains an active product status with a broad operating temperature range. Alternate models with matching electrical and mechanical parameters are required for supply continuity, compliance needs, or manufacturing preferences.

Key Parameters

Manufacturer Part Number	Manufacturer	Category	Voltage - Zener (Nom) (Vz)	Tolerance	Power - Max	Impedance (Max) (Zzt)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	Product Status	Moisture Sensitivity Level (MSL)	REACH Status	ECCN	HTSUS
1N6311	Microchip Technology	Diodes, Zener	3 V	±5%	500 mW	29 Ohms	30 µA @ 1 V	1.4 V @ 1 A	-65°C ~ 175°C	Through Hole	DO-204AH, DO-35, Axial	DO-35	RoHS non-compliant	Active	1 (Unlimited)	REACH Unaffected	EAR99	8541.10.0050

Substitute Part Grouping Explanation

Substitute selection is based strictly on electrical, mechanical, and regulatory parameters: nominal Zener voltage (Vz), tolerance, maximum power rating, impedance (Zzt), reverse leakage current, forward voltage, operating temperature range, mounting type, and package. All substitutions retain the DO-35 through-hole form factor and feature matching voltage, power, and mechanical characteristics within specified tolerances. RoHS and automotive qualification are considered for regulatory and compliance alignment.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Zener (Nom) (Vz)	Tolerance	Power - Max	Impedance (Max) (Zzt)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	Product Status	Moisture Sensitivity Level (MSL)	REACH Status	ECCN	HTSUS
1N6311	Microchip Technology	3 V	±5%	500 mW	29 Ohms	30 µA @ 1 V	1.4 V @ 1 A	-65°C ~ 175°C	Through Hole	DO-204AH, DO-35, Axial	DO-35	RoHS non-compliant	Active	1 (Unlimited)	REACH Unaffected	EAR99	8541.10.0050
BZX55B3V0-TAP	Vishay General Semiconductor - Diodes Division	3 V	±2%	500 mW	85 Ohms	4 µA @ 1 V	1.5 V @ 200 mA	-65°C ~ 175°C	Through Hole	DO-204AH, DO-35, Axial	DO-204AH (DO-35)	ROHS3 Compliant	Active	1 (Unlimited)	REACH Unaffected	EAR99	8541.10.0050

Engineering Selection Recommendations

The 1N6311 is RoHS non-compliant, while the BZX55B3V0-TAP offers ROHS3 compliance and AEC-Q101 automotive qualification. Both parts are active and available in DO-35 through-hole packaging, with matching Zener voltage and power handling capacity. For applications requiring RoHS compliance or automotive grade certification, BZX55B3V0-TAP is a suitable substitute. All substitute parts maintain unrestricted Moisture Sensitivity Level (MSL 1) and identical operating temperature ranges.

Frequently Asked Questions (FAQ)

Q1: What determines substitutability between Zener diodes in this category?
A1: Substitutability is determined by Zener voltage, tolerance, power rating, package format, mounting type, and matching environmental ratings.

Q2: Is the BZX55B3V0-TAP mechanically compatible with 1N6311?
A2: Both parts share the DO-35 axial through-hole package and mounting type.

Q3: Are there compliance differences between the main and substitute part?
A3: 1N6311 is not RoHS compliant; BZX55B3V0-TAP is ROHS3 compliant and is automotive qualified to AEC-Q101.

Q4: Can substitutes be directly used in the same circuit as the original?
A4: When electrical and mechanical parameters are matched as provided, direct substitution is possible within the rated specifications.

Q5: How important is tolerance when selecting substitutes?
A5: Tolerance affects voltage precision. The substitute BZX55B3V0-TAP offers tighter voltage tolerance (±2%) compared to 1N6311 (±5%).

Q6: Are reverse leakage current and impedance relevant for substitution?
A6: Reverse leakage and impedance affect performance. Both parts specify these parameters for comparison, ensuring selection is based on provided ratings.

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