BZX55A16-TAP Equivalent & Substitute Parts

Part Overview

The BZX55A16-TAP is a 16 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part carries automotive-grade qualification (AEC-Q101) and ROHS3 compliance.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	16 V
Tolerance	±1%
Power - Max	500 mW
Impedance (Max)	40 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 12 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA
Operating Temperature	175°C
Package / Case	DO-204AH (DO-35), Axial
Mounting Type	Through Hole
Grade	Automotive
Qualification	AEC-Q101

Substitute Part Grouping Explanation

Substitution of the BZX55A16-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 16 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 (DO-204AH) through-hole axial configuration
Mounting type: Through hole

Secondary Compatibility Factors:

Voltage tolerance (±1% to ±5% acceptable within design margin)
Impedance (Zzt) range: 17 to 48 Ohms
Reverse leakage current: 100 nA specification
Forward voltage characteristics
Operating temperature range

Substitute parts are grouped into three categories based on tolerance specifications and product status:

Category 1 - Direct Replacement (Active Status, Matching Tolerance): BZX55B16-TAP maintains identical electrical specifications with ±2% tolerance and active product status.

Category 2 - Functional Equivalents (Active Status, Tighter Tolerance): 1N5741C and 1N5741D provide ±1% tolerance matching the original specification with active product status.

Category 3 - Broader Tolerance Alternatives (Active Status, Relaxed Tolerance): 1N5246B, 1N5246B TR PBFREE, 1N6005A, 1N6005B, and 1N6005C offer ±2% to ±10% tolerance with active product status and varying impedance characteristics.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Operating Temp	Product Status	RoHS Status
BZX55A16-TAP	Vishay	16 V	±1%	500 mW	40 Ohms	1.5 V @ 200 mA	175°C	Obsolete	ROHS3
BZX55B16-TAP	Vishay	16 V	±2%	500 mW	40 Ohms	1.5 V @ 200 mA	-65°C ~ 175°C	Active	ROHS3
1N5741C	Microchip	16 V	±1%	500 mW	40 Ohms	900 mV @ 10 mA	-65°C ~ 175°C	Active	Non-compliant
1N5741D	Microchip	16 V	±1%	500 mW	40 Ohms	900 mV @ 10 mA	-65°C ~ 175°C	Active	Non-compliant
1N5246B	Microchip	16 V	±5%	500 mW	17 Ohms	1.5 V @ 200 mA	-65°C ~ 175°C	Active	Non-compliant
1N5246B TR PBFREE	Central Semiconductor	16 V	±5%	500 mW	17 Ohms	1.1 V @ 200 mA	-65°C ~ 200°C	Active	ROHS3
1N6005A	Microchip	16 V	±10%	500 mW	48 Ohms	1.1 V @ 200 mA	-65°C ~ 175°C	Active	Non-compliant
1N6005B	Microchip	16 V	±5%	500 mW	36 Ohms	1.1 V @ 200 mA	-65°C ~ 175°C	Active	Non-compliant
1N6005C	Microchip	16 V	±2%	500 mW	36 Ohms	1.1 V @ 200 mA	-65°C ~ 175°C	Active	Non-compliant

Engineering Selection Recommendations

For Automotive Applications with AEC-Q101 Requirement:

BZX55B16-TAP is the primary substitute, maintaining Vishay manufacturing continuity, ROHS3 compliance, and AEC-Q101 automotive qualification. The ±2% tolerance and expanded operating temperature range (-65°C to 175°C) provide enhanced reliability over the obsolete BZX55A16-TAP.

For Applications Requiring ROHS3 Compliance:

1N5246B TR PBFREE (Central Semiconductor) is the only substitute offering both ROHS3 compliance and active product status. This part extends the operating temperature to 200°C and provides ±5% tolerance with lower impedance (17 Ohms).

For Applications with Tighter Tolerance Requirements (±1%):

1N5741C and 1N5741D (Microchip) maintain the original ±1% tolerance specification with active product status and expanded operating temperature range. These parts are suitable for precision voltage regulation circuits where tolerance is critical. Note that RoHS compliance status differs from the original part.

For General-Purpose Applications with Relaxed Tolerance:

1N6005B and 1N6005C (Microchip) offer ±5% and ±2% tolerance respectively with active product status. These parts provide cost-effective alternatives with impedance characteristics suitable for standard voltage regulation applications.

For Extended Temperature Range Applications:

1N5246B TR PBFREE supports operation to 200°C, exceeding the original specification of 175°C maximum.

Frequently Asked Questions (FAQ)

Q: Can BZX55B16-TAP directly replace BZX55A16-TAP in all applications?

A: BZX55B16-TAP is a direct functional replacement. The primary difference is tolerance specification (±2% versus ±1%) and expanded operating temperature range. Applications requiring ±1% tolerance precision should evaluate circuit margin requirements before substitution.

Q: What is the significance of the impedance (Zzt) parameter in selecting a substitute?

A: Impedance affects the dynamic response of the Zener diode under transient load conditions. The BZX55A16-TAP specifies 40 Ohms maximum. Substitutes with lower impedance (such as 1N5246B at 17 Ohms) provide faster transient response, while higher impedance parts (1N6005A at 48 Ohms) may exhibit slower response. Circuit design should account for this parameter if transient regulation is critical.

Q: Are all substitute parts available in the same DO-35 package?

A: All listed substitute parts are available in DO-35 (DO-204AH) through-hole axial package configuration, ensuring mechanical compatibility with the original BZX55A16-TAP footprint.

Q: Which substitute offers the best compliance profile?

A: BZX55B16-TAP and 1N5246B TR PBFREE both offer ROHS3 compliance. BZX55B16-TAP additionally maintains AEC-Q101 automotive qualification matching the original part. 1N5246B TR PBFREE extends temperature range to 200°C.

Q: What is the difference between 1N5741C and 1N5741D?

A: Both parts are functionally identical with ±1% tolerance, 16 V nominal voltage, and 500 mW power rating. The designation difference reflects manufacturing lot or date code variations. Both are active products from Microchip Technology.

Q: Can I use 1N6005A as a substitute if tolerance is not critical?

A: 1N6005A is functionally compatible with ±10% tolerance specification. This part is suitable for applications where voltage regulation tolerance of ±1.6 V (at 16 V nominal) is acceptable. Impedance is specified at 48 Ohms maximum, which is higher than the original part.

Q: What is the impact of forward voltage (Vf) differences between substitutes?

A: Forward voltage differences affect power dissipation during forward conduction. The original BZX55A16-TAP specifies 1.5 V @ 200 mA. Substitutes with lower Vf (such as 900 mV @ 10 mA for 1N5741 series) reduce power loss during forward operation. This parameter is relevant only in applications where the diode conducts in forward bias mode.

Q: Is 1N5246B TR PBFREE suitable for automotive applications?

A: 1N5246B TR PBFREE is not qualified to AEC-Q101 automotive standard. While it offers ROHS3 compliance and extended temperature range, applications requiring automotive qualification should specify BZX55B16-TAP instead.

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