JANS1N4477D Zener Diode Equivalent & Substitute Parts Reference

Part Overview

JANS1N4477D is a military-grade Zener diode manufactured by Microchip Technology, designed for voltage regulation and reference applications. It provides a nominal Zener voltage of 33 V, with a maximum power dissipation of 1.5 W, and a tight tolerance of ±1%. Its through-hole DO-41 (DO-204AL, Axial) package is suitable for various high-reliability and military applications. Alternatives to JANS1N4477D are necessary due to factors such as inventory availability, qualification requirements, or regulatory compliance needs.

Key Parameters

Parameter	JANS1N4477D Value
Voltage - Zener (Nom) (Vz)	33 V
Tolerance	±1%
Power - Max	1.5 W
Impedance (Max) (Zzt)	25 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 26.4 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A
Operating Temperature	-65°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Supplier Device Package	DO-41
RoHS Status	RoHS non-compliant
REACH Status	REACH Unaffected
Product Status	Active
Grade	Military
Qualification	MIL-PRF-19500/406

Substitute Part Grouping Explanation

Substitute Zener diodes for JANS1N4477D are grouped strictly by matching the following key parameters: nominal Zener voltage (Vz), power rating, tolerance, maximum impedance, operating temperature range, reverse leakage current, package type, mounting method, and compliance or grade status. All listed substitute parts are DO-41 (DO-204AL, Axial) through-hole Zener diodes with a nominal Zener voltage of 33 V. Matching is limited to the provided electrical, mechanical, and compliance attributes.

Parameter Comparison

Parameter	JANS1N4477D	1N4752A-T50A	1N4752ATR	2EZ33D5-TP
Manufacturer	Microchip Technology	onsemi	onsemi	Micro Commercial Co
Voltage - Zener (Nom) (Vz)	33 V	33 V	33 V	33 V
Tolerance	±1%	±5%	±5%	±5%
Power - Max	1.5 W	1 W	1 W	2 W
Impedance (Max) (Zzt)	25 Ohms	45 Ohms	45 Ohms	23 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 26.4 V	5 µA @ 25.1 V	5 µA @ 25.1 V	500 nA @ 25.1 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A	-	-	1.2 V @ 200 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 200°C	-65°C ~ 200°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Supplier Device Package	DO-41	DO-41	DO-41	DO-41
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

Selection between JANS1N4477D and its substitutes—1N4752A-T50A, 1N4752ATR, and 2EZ33D5-TP—should be based on product status (all listed as Active), RoHS status, and REACH compliance. JANS1N4477D is RoHS non-compliant and military qualified (MIL-PRF-19500/406), while the substitute parts are ROHS3 compliant with no military qualification listed. Application-specific requirements related to compliance and qualification should guide part selection.

Frequently Asked Questions (FAQ)

Q1: What are the main parameters to compare when selecting a Zener diode substitute?
A1: The key parameters are Zener voltage (Vz), tolerance, maximum power rating, impedance (Zzt), reverse leakage current, operating temperature range, mounting type, and DO-41 package compatibility.

Q2: Why is Zener voltage (Vz) matching critical?
A2: The nominal Zener voltage determines the clamping or regulation value the diode provides, which must match across substitutes for functional equivalence.

Q3: How does package compatibility affect substitution?
A3: All parts listed use the DO-204AL, DO-41, Axial package, ensuring physical and mounting compatibility on existing PCBs designed for this outline.

Q4: Can a ROHS3 compliant substitute replace a RoHS non-compliant part?
A4: Yes, based strictly on RoHS status, a ROHS3 compliant part can be used as a substitute for a non-compliant part if all required electrical and mechanical parameters also match.

Q5: Is military qualification required for all applications?
A5: Military qualification (such as MIL-PRF-19500/406 on JANS1N4477D) is only necessary if specified by end-use requirements. The listed substitutes do not specify military qualification.

Q6: Are there differences in tolerance and power ratings among substitutes?
A6: Yes. Substitute parts have a wider tolerance (±5%) and different power ratings (1 W or 2 W), compared to the main part’s ±1% tolerance and 1.5 W rating.

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