1N5990C Equivalent & Substitute Parts Reference

Part Overview

The 1N5990C, manufactured by Microchip Technology, is an active Zener diode within the Diodes, Zener category. It features a nominal Zener voltage of 3.9 V, maximum power dissipation of 500 mW, and is packaged in DO-204AH (DO-35) through-hole format. The need for substitute or equivalent models stems from requirements such as inventory shortages, compliance, or manufacturer preference within the same electrical and mechanical operability parameters.

Key Parameters

Parameter	1N5990C Value
Manufacturer	Microchip Technology
Category	Diodes, Zener
Voltage - Zener (Nom) (Vz)	3.9 V
Tolerance	±2%
Power - Max	500 mW
Impedance (Max) (Zzt)	90 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA
Operating Temperature	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Supplier Device Package	DO-35
RoHS Status	RoHS non-compliant
Inventory	1029 Pcs New Original In Stock
Product Status	Active

Substitute Part Grouping Explanation

Substitute and equivalent part selection for Zener diodes is based strictly on the match of critical parameters: Zener voltage (Vz), tolerance, maximum power dissipation, Zener impedance (Zzt), reverse leakage current at defined voltage, forward voltage at specified current, operating temperature range, mounting type, and physical package/case. Only those parts matching or aligning with these specifications are listed as substitutes, ensuring compatibility in Diodes, Zener applications with DO-35 axial through-hole form factor.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power - Max	Zzt (Max)	I_R @ V_R	V_F @ I_F	Operating Temp (°C)	Mounting Type	Package / Case	RoHS Status	Product Status
1N5990C	Microchip Technology	3.9 V	±2%	500 mW	90 Ohms	10 µA @ 1 V	1.1 V @ 200 mA	-65 ~ 175	Through Hole	DO-204AH, DO-35, Axial	RoHS non-compliant	Active
1N5228B	Microchip Technology	3.9 V	±5%	500 mW	23 Ohms	10 µA @ 1 V	1.5 V @ 200 mA	-65 ~ 175	Through Hole	DO-204AH, DO-35, Axial	RoHS non-compliant	Active
1N5228BTR	Fairchild Semiconductor	3.9 V	±5%	500 mW	23 Ohms	10 µA @ 1 V	1.2 V @ 200 mA	-65 ~ 200	Through Hole	DO-204AH, DO-35, Axial	-	Active
BZX79-B3V9,113	Nexperia USA Inc.	3.9 V	±2%	400 mW	90 Ohms	3 µA @ 1 V	900 mV @ 10 mA	-65 ~ 200	Through Hole	DO-204AH, DO-35, Axial	ROHS3 Compliant	Active
BZX79-B3V9,133	Nexperia USA Inc.	3.9 V	±2%	400 mW	90 Ohms	3 µA @ 1 V	900 mV @ 10 mA	-65 ~ 200	Through Hole	DO-204AH, DO-35, Axial	ROHS3 Compliant	Active
TZX3V9C-TAP	Vishay General Semiconductor	3.9 V	-	500 mW	100 Ohms	5 µA @ 1 V	1.5 V @ 200 mA	-65 ~ 175	Through Hole	DO-204AH, DO-35, Axial	ROHS3 Compliant	Active

Engineering Selection Recommendations

Selection should be based on the active product status and inventory availability. Consider the parts' RoHS status and REACH compliance when regulatory conditions apply.

1N5990C and 1N5228B are RoHS non-compliant; suitable only where RoHS is not mandated.
BZX79-B3V9,113, BZX79-B3V9,133, and TZX3V9C-TAP are ROHS3 compliant and REACH unaffected, suitable for applications requiring EU and international environmental compliance.
Package format and mounting type are consistent across all substitutes.
Substitute part selection can include any listed active part with matched compliance requirements.

Frequently Asked Questions (FAQ)

Q: What are the key criteria for substituting the 1N5990C Zener diode?
A: Key criteria are Zener voltage (3.9 V), tolerance, maximum power rating, impedance, package/case type (DO-204AH, DO-35, Axial), through-hole mounting, and environmental compliance parameters.

Q: Are all substitutes compatible with the same PCB footprint?
A: All listed substitutes feature the DO-204AH, DO-35, Axial package and through-hole mounting, ensuring direct physical compatibility.

Q: How does RoHS status affect substitution?
A: Substitute selection must match the application's compliance requirements. Use only ROHS3 compliant parts when RoHS conformity is a design or regulatory constraint.

Q: Can a substitute with lower power rating (e.g., 400 mW vs 500 mW) be used?
A: Parameter matching should be strictly observed; select only substitutes meeting the exact or higher maximum power requirement as specified for 1N5990C.

Q: Why do tolerances vary among substitutes?
A: Tolerance impacts voltage regulation precision. Ensure the tolerance of the substitute matches the circuit specifications for consistent performance.

Q: Are forward voltage and reverse leakage important in substitution?
A: Yes, these values must align with circuit expectations to avoid excess losses or leakage, and are included in the comparison for direct selection.

Q: What if a certain manufacturer's part is not available?
A: Any part listed, provided all key electrical and mechanical parameters are met, is suitable as an equivalent substitute in the Diodes, Zener, DO-35 category for 1N5990C.

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