BZX85C16-TAP Equivalent & Substitute Parts

Part Overview

The BZX85C16-TAP is an automotive-grade Zener diode manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component operates at a nominal Zener voltage of 16 V with a maximum power dissipation of 1.3 W, packaged in the DO-204AL (DO-41) axial configuration. The device is AEC-Q101 qualified and RoHS3 compliant, making it suitable for automotive and industrial applications requiring voltage regulation and transient protection.

Substitute parts are necessary when the primary part experiences extended lead times, inventory constraints, or when design flexibility permits the use of functionally equivalent alternatives from different manufacturers. All substitute parts listed maintain electrical compatibility within the specified parameter tolerances and mechanical compatibility with the DO-41 package footprint.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Voltage - Zener (Nom)	16	V	Critical - must match exactly for voltage regulation function
Tolerance	±5%	%	Critical - defines acceptable voltage variation
Power - Max	1.3	W	Critical - determines thermal capability and current handling
Impedance (Max)	15	Ohms	Important - affects voltage stability and transient response
Current - Reverse Leakage	500 nA @ 12 V	nA	Important - indicates leakage characteristics
Operating Temperature	175	°C	Important - defines maximum junction temperature
Package / Case	DO-204AL, DO-41, Axial	-	Critical - ensures mechanical and electrical compatibility
Mounting Type	Through Hole	-	Critical - determines PCB assembly compatibility
Grade	Automotive	-	Important - indicates qualification for automotive environments
Qualification	AEC-Q101	-	Important - automotive reliability standard

Substitute Part Grouping Explanation

Substitution eligibility for the BZX85C16-TAP is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage: 16 V (nominal)
Voltage tolerance: ±5%
Package type: DO-204AL / DO-41 axial configuration
Mounting type: Through hole

Electrical Compatibility Parameters:

Maximum power dissipation: 1.3 W or greater
Impedance (maximum): 15 Ohms or lower
Operating temperature range: minimum 175°C junction temperature
Reverse leakage current: measured at specified voltage conditions

Compliance Parameters:

RoHS3 compliance required
Automotive grade preferred for applications requiring AEC-Q101 qualification

All substitute parts listed maintain the 16 V nominal Zener voltage and ±5% tolerance specification. Variations in maximum power rating, impedance, and reverse leakage characteristics are documented in the parameter comparison table. Substitute parts with lower maximum power ratings (1 W versus 1.3 W) are acceptable only for applications where thermal dissipation does not exceed the substitute part's rated capability.

Parameter Comparison

Parameter	BZX85C16-TAP (Main)	1N4745A-TAP	1N4745A (Lumimax)	1N4745ATR (Fairchild)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Lumimax Optoelectronic Technology	Fairchild Semiconductor
Voltage - Zener (Nom)	16 V	16 V	16 V	16 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1.3 W	1.3 W	1 W	1 W
Impedance (Max)	15 Ohms	16 Ohms	16 Ohms	16 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 12 V	5 µA @ 12.2 V	5 µA @ 12.2 V	5 µA @ 12.2 V
Operating Temperature (Max)	175°C	175°C (TJ)	200°C	200°C
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Grade	Automotive	Automotive	-	-
Qualification	AEC-Q101	AEC-Q101	-	-
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	-

Engineering Selection Recommendations

Primary Substitute: 1N4745A-TAP (Vishay General Semiconductor)

The 1N4745A-TAP is the direct equivalent substitute for the BZX85C16-TAP. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications: 16 V nominal Zener voltage, ±5% tolerance, 1.3 W maximum power dissipation, and DO-41 axial package configuration. Both parts carry automotive grade designation and AEC-Q101 qualification. The 1N4745A-TAP is supplied in cut tape packaging and maintains RoHS3 compliance. This substitute is suitable for all applications where the BZX85C16-TAP is specified.

Secondary Substitute: 1N4745A (Lumimax Optoelectronic Technology)

The 1N4745A from Lumimax maintains the 16 V nominal Zener voltage and ±5% tolerance specification. This part is supplied in DO-41G package configuration and is RoHS compliant. The maximum power dissipation is rated at 1 W, which is lower than the primary part's 1.3 W rating. The operating temperature range extends to 200°C, exceeding the primary part's 175°C specification. This substitute is suitable for applications where thermal dissipation does not exceed 1 W. Automotive grade and AEC-Q101 qualification are not specified for this part.

Tertiary Substitute: 1N4745ATR (Fairchild Semiconductor)

The 1N4745ATR from Fairchild Semiconductor maintains the 16 V nominal Zener voltage and ±5% tolerance specification. This part is supplied in bulk packaging and rated for 1 W maximum power dissipation. The operating temperature range extends to 200°C. Automotive grade and AEC-Q101 qualification are not specified. This substitute is suitable for applications where thermal dissipation does not exceed 1 W and automotive qualification is not required.

Selection Criteria:

For applications requiring automotive qualification and AEC-Q101 compliance, use 1N4745A-TAP (Vishay). For applications where maximum power dissipation is limited to 1 W or less, 1N4745A (Lumimax) or 1N4745ATR (Fairchild) are acceptable alternatives. All substitute parts maintain mechanical compatibility with the DO-41 through-hole package footprint and electrical compatibility within the specified voltage and tolerance parameters.

Frequently Asked Questions (FAQ)

Q: Can the 1N4745A-TAP be used as a direct replacement for the BZX85C16-TAP?

A: Yes. The 1N4745A-TAP is a direct equivalent substitute. Both parts are manufactured by Vishay General Semiconductor, share identical electrical specifications (16 V, ±5%, 1.3 W), and are packaged in DO-41 axial configuration. Both carry automotive grade designation and AEC-Q101 qualification.

Q: What is the difference between the 1N4745A-TAP and the 1N4745A from Lumimax?

A: The primary differences are manufacturer, maximum power rating, and qualification status. The 1N4745A-TAP (Vishay) is rated for 1.3 W and carries AEC-Q101 qualification. The 1N4745A (Lumimax) is rated for 1 W and does not carry automotive qualification. Both maintain 16 V nominal voltage and ±5% tolerance. The Lumimax part is suitable only for applications where power dissipation does not exceed 1 W.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts are packaged in DO-204AL / DO-41 axial configuration with through-hole mounting. They are mechanically compatible with PCB designs specified for the BZX85C16-TAP.

Q: Why does the BZX85C16-TAP have lower reverse leakage current (500 nA) compared to the substitute parts (5 µA)?

A: Reverse leakage current is a measured characteristic that varies between manufacturers and manufacturing processes. The BZX85C16-TAP exhibits lower leakage at the specified measurement condition (500 nA @ 12 V), while substitute parts exhibit higher leakage (5 µA @ 12.2 V). Both values are within acceptable ranges for Zener diode operation. Applications sensitive to leakage current should specify the BZX85C16-TAP or verify that substitute part leakage characteristics are acceptable for the circuit design.

Q: Can I use the 1N4745A (Lumimax) or 1N4745ATR (Fairchild) in an automotive application requiring AEC-Q101 qualification?

A: No. The 1N4745A (Lumimax) and 1N4745ATR (Fairchild) do not carry automotive grade designation or AEC-Q101 qualification. For automotive applications requiring AEC-Q101 compliance, use the BZX85C16-TAP or 1N4745A-TAP (Vishay).

Q: What is the impedance difference between the main part and substitute parts?

A: The BZX85C16-TAP has a maximum impedance of 15 Ohms, while all substitute parts have a maximum impedance of 16 Ohms. This 1 Ohm difference is negligible for most applications and does not affect functional compatibility. Impedance affects voltage stability and transient response characteristics; applications with stringent impedance requirements should specify the BZX85C16-TAP.

Q: Are all parts RoHS compliant?

A: The BZX85C16-TAP and 1N4745A-TAP are RoHS3 compliant. The 1N4745A (Lumimax) is RoHS compliant. The 1N4745ATR (Fairchild) RoHS status is not specified in the provided data. Verify RoHS compliance status with the manufacturer if required for your application.

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