BZX85C16 R0G Equivalent & Substitute Parts

Part Overview

The BZX85C16 R0G is a Zener diode manufactured by Taiwan Semiconductor Corporation, rated at 16 V nominal voltage with 1.3 W maximum power dissipation. The device is packaged in DO-204AL (DO-41) axial through-hole configuration and is compliant with ROHS3 and REACH standards. The part is currently active in production with 881 pieces in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers are preferred for supply chain diversification, or when specific packaging or compliance requirements necessitate alternative sourcing.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5%	%
Power - Max	1.3	W
Impedance (Max)	15	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 12 V
Voltage - Forward (Max) @ If	1.2	V @ 10 mA
Operating Temperature	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): Must match or fall within acceptable circuit tolerance
Power - Max: Must equal or exceed the application requirement
Tolerance: Must be ±5% or better
Package / Case: Must be DO-204AL, DO-41, or Axial through-hole configuration
Operating Temperature Range: Must encompass the application's thermal requirements
Mounting Type: Must be Through Hole

Secondary Compatibility Factors:

Impedance (Max): Lower impedance values indicate better regulation characteristics
Current - Reverse Leakage: Lower leakage indicates superior performance
RoHS and REACH Compliance: Required for regulated applications

Substitute parts are grouped into two categories based on voltage matching:

Category A - Exact Voltage Match (16 V): Parts with 16 V nominal Zener voltage provide direct functional equivalence. These include 1N4745A, 1N4745A-T50A, 1N4745A-TAP, and 1N4745ATR.

Category B - Near-Voltage Match (15 V): Parts with 15 V nominal Zener voltage operate within ±5% tolerance band of the 16 V specification. These include 1N4744A, 1N4744A-T50A, 1N4744A-T50R, 1N4744ATR, and 1N5929BG. These are suitable for applications where 15 V regulation is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Impedance (Max)	Reverse Leakage @ Vr	Operating Temp	Package	RoHS Status	Product Status
BZX85C16 R0G	Taiwan Semiconductor	16 V	1.3 W	15 Ω	500 nA @ 12 V	-65 to 200°C	DO-204AL	ROHS3	Active
1N4744A	Microchip Technology	15 V	1 W	14 Ω	5 µA @ 11.4 V	-65 to 175°C	DO-204AL	Non-compliant	Discontinued
1N4744A-T50A	onsemi	15 V	1 W	14 Ω	5 µA @ 11.4 V	-65 to 200°C	DO-41	ROHS3	Active
1N4744A-T50R	Fairchild Semiconductor	15 V	1 W	14 Ω	5 µA @ 11.4 V	-65 to 200°C	DO-41	Not applicable	Active
1N4744ATR	onsemi	15 V	1 W	14 Ω	5 µA @ 11.4 V	-65 to 200°C	DO-41	ROHS3	Active
1N4745A	Lumimax Optoelectronic	16 V	1 W	16 Ω	5 µA @ 12.2 V	-65 to 200°C	DO-41	RoHS Compliant	Active
1N4745A-T50A	onsemi	16 V	1 W	16 Ω	5 µA @ 12.2 V	-65 to 200°C	DO-41	ROHS3	Active
1N4745A-TAP	Vishay General Semiconductor	16 V	1.3 W	16 Ω	5 µA @ 12.2 V	-65 to 175°C	DO-204AL	ROHS3	Active
1N4745ATR	Fairchild Semiconductor	16 V	1 W	16 Ω	5 µA @ 12.2 V	-65 to 200°C	DO-41	Not specified	Active
1N5929BG	Microsemi Corporation	15 V	1.25 W	9 Ω	1 µA @ 11.4 V	-65 to 175°C	DO-204AL	Non-compliant	Active
1N5929BRLG	onsemi	15 V	3 W	9 Ω	1 µA @ 11.4 V	-65 to 200°C	Axial	ROHS3	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended for Primary Substitution):

1N4745A-TAP (Vishay General Semiconductor) is the closest functional equivalent to BZX85C16 R0G. It matches the 16 V nominal voltage, 1.3 W power rating, and DO-204AL package. Both parts are ROHS3 compliant and rated for -65 to 175°C operation. The part is AEC-Q101 qualified for automotive applications and carries active product status with 35,400 units in stock.

Alternative Equivalents (16 V Voltage Match):

1N4745A-T50A (onsemi) provides 16 V nominal voltage with 1 W power rating in DO-41 package. ROHS3 compliant and active status with 5,695 units available. Suitable where 1 W power dissipation is sufficient.

1N4745ATR (Fairchild Semiconductor) offers 16 V nominal voltage with 1 W power rating. Active product status with 17,506 units in stock. Operating temperature range extends to -65 to 200°C.

Secondary Alternatives (15 V Voltage Match):

1N4744A-T50A (onsemi) and 1N4744ATR (onsemi) both provide 15 V nominal voltage with 1 W power rating. Both are ROHS3 compliant and active. These are suitable for applications where 15 V regulation falls within circuit tolerance specifications.

1N5929BG (Microsemi Corporation) provides 15 V nominal voltage with 1.25 W power rating in DO-204AL package. Superior impedance characteristics (9 Ω) and lower reverse leakage (1 µA) compared to the main part. However, RoHS non-compliant status may restrict use in regulated applications.

1N5929BRLG (onsemi) offers 15 V nominal voltage with 3 W power rating in axial package. ROHS3 compliant and active status. Suitable for applications requiring higher power dissipation capacity.

Parts to Avoid:

1N4744A (Microchip Technology) is discontinued at DiGi Electronics and RoHS non-compliant. Not recommended for new designs.

1N4744A-T50R (Fairchild Semiconductor) carries unspecified RoHS status and should be verified for compliance requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 15 V Zener diode for the 16 V BZX85C16 R0G?

A: Yes, within circuit tolerance limits. The ±5% tolerance specification allows 15 V to 16.8 V operation. A 15 V Zener operates at the lower tolerance boundary. Verify that your circuit design accepts this voltage variation before substitution.

Q: What is the difference between DO-204AL and DO-41 packages?

A: DO-204AL and DO-41 are equivalent designations for the same axial through-hole package. Both refer to a cylindrical component with leads at each end. Mechanical compatibility is identical.

Q: Why does 1N4745A-TAP show a maximum operating temperature of 175°C while the main part specifies 200°C?

A: The 1N4745A-TAP is AEC-Q101 qualified for automotive applications, which typically specifies 175°C as the maximum junction temperature. The BZX85C16 R0G allows 200°C operation. For non-automotive applications, this difference is not significant. For automotive use, the 1N4745A-TAP is the preferred choice due to its qualification status.

Q: Is 1N5929BRLG a suitable substitute despite its 3 W power rating?

A: Yes, for applications where higher power dissipation capacity is beneficial. The 3 W rating provides design margin and thermal headroom. However, the 15 V nominal voltage requires circuit tolerance verification. The axial package is mechanically compatible with DO-41 through-hole mounting.

Q: What does ROHS3 compliance mean?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. ROHS3 compliant parts are required for most regulated markets and consumer applications.

Q: Can I use 1N4744A-T50A as a direct replacement?

A: 1N4744A-T50A is functionally compatible for applications where 15 V regulation is acceptable. It is ROHS3 compliant and active. The primary difference is the 1 W power rating versus 1.3 W on the main part. Verify that your circuit's power dissipation does not exceed 1 W before substitution.

Q: Why is reverse leakage current specified at different voltages across parts?

A: Reverse leakage is voltage-dependent. The main part specifies 500 nA @ 12 V, while most substitutes specify 5 µA @ 11.4 V. These measurements are taken at different bias points. Lower leakage values indicate superior performance characteristics, but direct comparison requires normalization to the same voltage reference.

Q: Is 1N5929BG recommended despite RoHS non-compliance?

A: 1N5929BG is not recommended for new designs or regulated applications due to RoHS non-compliance. It may be used only in legacy systems or applications where RoHS compliance is not required. Verify regulatory requirements before selection.

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