BZX85C3V3 Equivalent & Substitute Parts

Part Overview

The BZX85C3V3 is a 3.3 V, 1 W Zener diode manufactured by onsemi in DO-204AL (DO-41) axial through-hole package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical specifications, while substitute parts provide functional alternatives with modified parameters within acceptable operating ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±6%	-
Power - Max	1	W
Impedance (Max)	20	Ohms
Current - Reverse Leakage @ Vr	60	µA @ 1 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-

Substitute Part Grouping Explanation

Substitution of the BZX85C3V3 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Zener voltage (Nom): 3.3 V (primary specification)
Power dissipation capability: minimum 1 W
Operating temperature range: must encompass or match -65°C to 200°C
Package type: DO-204AL (DO-41) axial through-hole configuration

Acceptable Parameter Variations:

Tolerance: ±6% or tighter (±5%, ±2%, ±1% acceptable)
Impedance (Max): 20 Ohms or lower
Reverse leakage current: up to 100 µA @ 1 V
Forward voltage: up to 1.5 V @ 200 mA

Substitute parts are grouped by power rating capability and tolerance specification. Parts with equal or greater power ratings and matching zener voltage are direct functional substitutes. Tolerance variations are acceptable provided the application does not require the original ±6% specification.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Status
BZX85C3V3	onsemi	3.3 V	±6%	1 W	20 Ω	60 µA @ 1 V	1.2 V @ 200 mA	-65 to 200°C	Obsolete
1N4728A	Lumimax Optoelectronic Technology	3.3 V	±5%	1 W	10 Ω	100 µA @ 1 V	1.2 V @ 200 mA	-65 to 200°C	Active
1N5913BRLG	onsemi	3.3 V	±5%	3 W	10 Ω	100 µA @ 1 V	1.5 V @ 200 mA	-65 to 200°C	Active
BZX85C3V3-TR	Vishay General Semiconductor - Diodes Division	3.3 V	±5%	1.3 W	20 Ω	40 µA @ 1 V	-	-55 to 175°C	Active
1N5913AG	Microsemi Corporation	3.3 V	±10%	1.25 W	10 Ω	100 µA @ 1 V	1.2 V @ 200 mA	-65 to 175°C	Active
1N5913CG	Microsemi Corporation	3.3 V	±2%	1.25 W	10 Ω	100 µA @ 1 V	1.2 V @ 200 mA	-65 to 175°C	Active
1N5913DG	Microsemi Corporation	3.3 V	±1%	1.25 W	10 Ω	100 µA @ 1 V	1.2 V @ 200 mA	-65 to 175°C	Active

Engineering Selection Recommendations

Direct Equivalent (Preferred for Obsolescence Replacement):

BZX85C3V3-TR (Vishay General Semiconductor - Diodes Division) is the primary equivalent. This part maintains the same base product number (BZX85C3V3), identical zener voltage (3.3 V), matching impedance specification (20 Ohms), and equivalent power rating (1.3 W exceeds 1 W requirement). The part is active in production with AEC-Q101 automotive qualification and ROHS3 compliance. Operating temperature range (-55 to 175°C) is narrower than the original but covers standard industrial and automotive applications.

Active Substitutes with Enhanced Power Rating:

1N5913BRLG (onsemi) provides 3 W power dissipation with identical zener voltage and improved impedance (10 Ohms). This part is suitable for applications requiring higher thermal margin or increased power handling. Operating temperature range matches the original specification (-65 to 200°C). ROHS3 compliance is confirmed.

Active Substitutes with Tighter Tolerance:

1N5913CG and 1N5913DG (Microsemi Corporation) offer ±2% and ±1% tolerance respectively, compared to the original ±6%. These parts are applicable where voltage regulation precision is critical. Both maintain 3.3 V zener voltage, 1.25 W power rating, and 10 Ohms impedance. Operating temperature range is -65 to 175°C. RoHS non-compliance status must be evaluated against application requirements.

General-Purpose Substitute:

1N4728A (Lumimax Optoelectronic Technology) is a 1 W, 3.3 V zener diode with ±5% tolerance and improved impedance (10 Ohms). This part is widely available with 20,200 units in stock and maintains full operating temperature range compatibility (-65 to 200°C).

Tolerance Consideration:

1N5913AG (Microsemi Corporation) features ±10% tolerance, which is wider than the original ±6% specification. This part is suitable only for applications with relaxed voltage regulation requirements.

Frequently Asked Questions (FAQ)

Q: Can BZX85C3V3-TR directly replace BZX85C3V3 in all applications?

A: BZX85C3V3-TR is electrically compatible for most applications. The operating temperature range is narrower (-55 to 175°C versus -65 to 200°C). Verify that your application does not require operation below -55°C or above 175°C. The part is automotive-qualified (AEC-Q101) and ROHS3 compliant.

Q: What is the difference between 1N5913BRLG and BZX85C3V3?

A: Both are 3.3 V zener diodes in DO-41 package. The primary difference is power rating: 1N5913BRLG is rated 3 W versus 1 W for BZX85C3V3. The 1N5913BRLG has lower impedance (10 Ohms versus 20 Ohms) and slightly higher forward voltage (1.5 V versus 1.2 V at 200 mA). Use 1N5913BRLG when higher power dissipation capability is required.

Q: Are all substitute parts in DO-41 package?

A: Yes. All listed substitute parts are through-hole axial components in DO-204AL (DO-41) package configuration, maintaining mechanical and electrical compatibility with the original BZX85C3V3.

Q: Which substitute has the best voltage tolerance?

A: 1N5913DG offers ±1% tolerance, the tightest specification among all listed parts. 1N5913CG provides ±2% tolerance. Both are manufactured by Microsemi Corporation. The original BZX85C3V3 specifies ±6% tolerance.

Q: Is RoHS compliance required for my application?

A: BZX85C3V3-TR, 1N4728A, and 1N5913BRLG are RoHS compliant (ROHS3). The Microsemi parts (1N5913AG, 1N5913CG, 1N5913DG) are listed as RoHS non-compliant. Verify your application requirements before selection.

Q: Can I use a higher power-rated zener diode as a substitute?

A: Yes. A higher power-rated zener diode (such as 1N5913BRLG at 3 W) is functionally compatible with applications designed for 1 W operation. The higher power rating provides additional thermal margin and does not degrade circuit performance. Verify that circuit board thermal design accommodates the substitute component.

Q: What is the significance of impedance (Zzt) specification?

A: Impedance affects voltage regulation quality. Lower impedance (10 Ohms in substitutes versus 20 Ohms in original) provides better voltage stability under load changes. Substitutes with 10 Ohms impedance offer improved regulation performance compared to the original 20 Ohms specification.

Q: Are there inventory considerations for part selection?

A: BZX85C3V3-TR has 20,648 units in stock. 1N4728A has 20,200 units available. 1N5913BRLG has 2,761 units. Microsemi parts (1N5913AG, 1N5913CG, 1N5913DG) have lower inventory (647, 960, and 770 units respectively). Verify availability for production volume requirements.

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