Equivalent & Substitute Parts for BZX85C5V6

Part Overview

The BZX85C5V6 is a Zener diode rated at 5.6 V nominal voltage with 1 W maximum power dissipation in a DO-204AL (DO-41) through-hole axial package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete product status and limited inventory availability (1,285 pieces), identification of equivalent and substitute Zener diodes with matching or superior electrical characteristics is necessary for design continuity and procurement planning.

Key Parameters

Parameter	BZX85C5V6
Voltage - Zener (Nom) (Vz)	5.6 V
Tolerance	±7%
Power - Max	1 W
Impedance (Max) (Zzt)	7 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature Range	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the BZX85C5V6 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 5.6 V nominal
Package type: DO-204AL (DO-41) through-hole axial configuration
Mounting type: Through hole
Operating temperature range compatibility

Secondary Compatibility Criteria:

Power rating: Equal to or greater than 1 W
Voltage tolerance: ±7% or tighter
Impedance characteristics: Maximum 7 Ohms or lower
Reverse leakage current: 1 µA @ 2 V or lower

Substitute parts are grouped into three categories:

Direct Equivalents: Identical voltage, power rating, and package with active product status and improved tolerance specifications
Higher Power Alternatives: Same voltage and package with increased power dissipation capability
Reduced Power Alternatives: Same voltage and package with lower power ratings, suitable only for reduced-power applications

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	Status
BZX85C5V6	onsemi	5.6	±7%	1	7	1 µA @ 2 V	1.2 V @ 200 mA	-65 to 200°C	DO-204AL	Obsolete
BZX85C5V6-TAP	Vishay	5.6	±5%	1.3	7	1 µA @ 2 V	—	-55 to 175°C	DO-204AL	Active
1N4734A	Microsemi	5.6	±5%	1	5	10 µA @ 2 V	—	-65 to 200°C	DO-204AL	Active
1N4734AE3/TR13	Microchip	5.6	±5%	1	5	10 µA @ 2 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL	Active
1N4734AP/TR12	Microchip	5.6	±5%	1	5	10 µA @ 2 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL	Active
1N4734AP/TR8	Microchip	5.6	±5%	1	5	10 µA @ 2 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL	Active
1N4734CE3/TR13	Microchip	5.6	±2%	1	5	10 µA @ 2 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL	Active
1N4734CP/TR12	Microchip	5.6	±2%	1	5	10 µA @ 2 V	1.2 V @ 200 mA	-65 to 150°C	DO-204AL	Active
1N5919BRLG	onsemi	5.6	±5%	3	2	5 µA @ 3 V	1.5 V @ 200 mA	-65 to 200°C	DO-204AL	Active
1N5232B	Microchip	5.6	±5%	0.5	11	5 µA @ 3 V	1.5 V @ 200 mA	-65 to 175°C	DO-204AH	Active
1N4626-1	Microchip	5.6	±5%	0.5	1400	1 µA @ 5.2 V	1.1 V @ 200 mA	-65 to 175°C	DO-204AA	Active

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Recommended for Most Applications):

The BZX85C5V6-TAP (Vishay) is the primary direct substitute. It maintains identical zener voltage (5.6 V), equivalent impedance (7 Ohms), and identical reverse leakage current (1 µA @ 2 V). The part offers improved tolerance (±5% versus ±7%), increased power rating (1.3 W versus 1 W), and active product status with AEC-Q101 automotive qualification. Operating temperature range is reduced to -55°C to 175°C, which is acceptable for most industrial and commercial applications.

The 1N4734A series (Microsemi, Microchip variants: 1N4734AE3/TR13, 1N4734AP/TR12, 1N4734AP/TR8) provides equivalent 1 W power rating with improved tolerance (±5%) and lower impedance (5 Ohms). All variants maintain 5.6 V zener voltage and DO-204AL packaging. Operating temperature range is -65°C to 150°C. The 1N4734CE3/TR13 and 1N4734CP/TR12 variants offer superior ±2% tolerance. All 1N4734 variants are in active production with high inventory availability.

Tier 2 - Higher Power Alternative:

The 1N5919BRLG (onsemi) provides 3 W power dissipation with identical zener voltage and package. This part is suitable for applications requiring higher power handling. It features improved impedance (2 Ohms), RoHS3 compliance, and full -65°C to 200°C operating range matching the original part. Use this substitute only when increased power dissipation is required.

Tier 3 - Reduced Power Alternatives (Limited Application):

The 1N5232B (Microchip, 500 mW) and 1N4626-1 (Microchip, 500 mW) are suitable only for applications with reduced power requirements. These parts maintain 5.6 V zener voltage but feature different packages (DO-204AH and DO-204AA respectively) and are not recommended as direct replacements for the original DO-204AL package requirement.

Compliance Considerations:

BZX85C5V6-TAP is AEC-Q101 qualified and RoHS3 compliant, suitable for automotive applications. The 1N4734 series from Microchip offers RoHS3 compliance on select variants (1N4734AE3/TR13, 1N4734AP/TR8, 1N4734CE3/TR13). All substitute parts maintain REACH compliance and EAR99 export classification matching the original part.

Frequently Asked Questions (FAQ)

Q: Can the BZX85C5V6 be directly replaced with the 1N4734A?

A: Yes. Both parts share identical 5.6 V zener voltage, 1 W power rating, and DO-204AL package. The 1N4734A offers improved ±5% tolerance versus the original ±7%, and lower impedance (5 Ohms versus 7 Ohms). Operating temperature range is -65°C to 150°C versus the original -65°C to 200°C. This substitution is valid for applications not requiring operation above 150°C.

Q: What is the difference between 1N4734A, 1N4734AE3/TR13, 1N4734AP/TR12, and 1N4734AP/TR8?

A: All four parts are electrically identical with 5.6 V zener voltage, 1 W power rating, ±5% tolerance, and DO-204AL packaging. Differences are in packaging format (bulk versus tape & reel) and RoHS compliance status. The 1N4734AE3/TR13 and 1N4734AP/TR8 are RoHS3 compliant; 1N4734AP/TR12 is not. Select based on procurement packaging requirements and compliance mandates.

Q: Why does the 1N4734CE3/TR13 have ±2% tolerance instead of ±5%?

A: The 1N4734CE3/TR13 is a precision variant of the 1N4734 series with tighter voltage tolerance (±2% versus ±5%). All other electrical parameters remain identical. Use this variant when tighter zener voltage regulation is required.

Q: Is the 1N5919BRLG a suitable replacement for the BZX85C5V6?

A: The 1N5919BRLG is electrically compatible with identical 5.6 V zener voltage and DO-204AL package. However, it provides 3 W power dissipation versus the original 1 W. Use this part only when higher power handling is required. It is not necessary for applications operating within the original 1 W specification.

Q: What is the difference between DO-204AL and DO-204AH packages?

A: DO-204AL (DO-41) and DO-204AH (DO-35) are both through-hole axial packages but differ in physical dimensions. DO-204AL is larger and rated for higher power dissipation. The 1N5232B uses DO-204AH and is not a direct package replacement for the original DO-204AL requirement.

Q: Can I use the 1N5232B or 1N4626-1 as replacements?

A: These 500 mW parts are not recommended as direct replacements. They feature different packages (DO-204AH and DO-204AA respectively) and reduced power rating. Use only if your application requires lower power dissipation and the different package is acceptable for your circuit layout.

Q: Which substitute offers the best compliance for automotive applications?

A: The BZX85C5V6-TAP (Vishay) is AEC-Q101 qualified and RoHS3 compliant, making it the optimal choice for automotive applications. The 1N4734 series offers RoHS3 compliance on select variants but lacks automotive qualification.

Q: What is the inventory status of substitute parts?

A: BZX85C5V6-TAP has 144,899 pieces in stock. The 1N4734A series has 285,200 pieces (1N4734A), 684 pieces (1N4734AE3/TR13), 996 pieces (1N4734AP/TR12), and 867 pieces (1N4734AP/TR8). The 1N5919BRLG has 12,200 pieces. All substitutes have significantly higher availability than the original obsolete part (1,285 pieces).

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