BZX55A11-TAP Equivalent & Substitute Parts

Part Overview

The BZX55A11-TAP is a Zener diode rated at 11 V nominal with 500 mW power dissipation, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, though 1146 pieces remain in stock as new original inventory. The part is housed in a DO-204AH (DO-35) axial through-hole package and meets automotive-grade specifications with AEC-Q101 qualification.

Due to the obsolete status of BZX55A11-TAP, equivalent and substitute parts are necessary for ongoing design support, production continuity, and long-term component availability. Active alternatives with matching or comparable electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	11	V
Power - Maximum	500	mW
Tolerance	±1%	—
Impedance (Maximum)	20	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 8.2 V
Voltage - Forward (Maximum) @ 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	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the BZX55A11-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 11 V nominal
Power rating: 500 mW
Package type: DO-204AH (DO-35) axial through-hole
Mounting: Through-hole configuration

Secondary Compatibility Factors:

Tolerance range (±1%, ±2%, or ±5%)
Impedance (Zzt) maximum value
Reverse leakage current specifications
Forward voltage characteristics
Operating temperature range
Regulatory compliance (RoHS, REACH, AEC-Q101)

Substitute parts are grouped based on tolerance class and product status. Parts with tighter tolerance (±1% or ±2%) provide closer electrical matching to the original specification. Parts with ±5% tolerance represent broader substitution options suitable for applications with relaxed precision requirements.

Parameter Comparison

Parameter	BZX55A11-TAP	BZX55B11-TAP	1N5241B TR PBFREE	1N5737B	1N6001B	1N6001C
Manufacturer	Vishay	Vishay	Central Semiconductor	Microchip	Microchip	Microchip
Voltage - Zener (Nom)	11 V	11 V	11 V	11 V	11 V	11 V
Tolerance	±1%	±2%	±5%	±5%	±5%	±2%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	20 Ω	20 Ω	22 Ω	20 Ω	18 Ω	18 Ω
Current - Reverse Leakage @ Vr	100 nA @ 8.2 V	100 nA @ 8.2 V	2 µA @ 8.4 V	100 nA @ 8 V	100 nA @ 8.4 V	100 nA @ 8.4 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	900 mV @ 10 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	175°C	-65°C ~ 175°C	-65°C ~ 200°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Package / Case	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35	DO-204AH, DO-35
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant
AEC-Q101	Yes	Yes	No	No	No	No

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Highest Compatibility):

BZX55B11-TAP is the primary direct substitute. This part is manufactured by the same supplier (Vishay) and shares identical electrical specifications with the original BZX55A11-TAP except for tolerance (±2% versus ±1%) and expanded operating temperature range (-65°C to 175°C). The BZX55B11-TAP maintains AEC-Q101 automotive qualification and ROHS3 compliance. Product status is active with substantial inventory availability (19,808 pieces).

Tier 2 - Functional Equivalents (Tighter Tolerance):

1N6001C (Microchip Technology) provides ±2% tolerance matching, equivalent to BZX55B11-TAP. This part features lower impedance (18 Ω versus 20 Ω) and identical forward voltage characteristics. Operating temperature range extends to -65°C to 175°C. However, RoHS compliance status is non-compliant, and AEC-Q101 qualification is not specified. Inventory is available (1,072 pieces).

Tier 3 - Functional Equivalents (Broader Tolerance):

1N5241B TR PBFREE (Central Semiconductor Corp), 1N5737B (Microchip), and 1N6001B (Microchip) all provide ±5% tolerance. These parts maintain the 11 V nominal zener voltage and 500 mW power rating in DO-35 packages. 1N5241B TR PBFREE offers the widest operating temperature range (-65°C to 200°C) and ROHS3 compliance. 1N5737B and 1N6001B have RoHS non-compliant status. All three are active products with available inventory.

Compliance Considerations:

For applications requiring ROHS3 compliance, select from BZX55B11-TAP or 1N5241B TR PBFREE. For automotive-grade applications requiring AEC-Q101 qualification, BZX55B11-TAP is the only active substitute meeting this requirement.

Frequently Asked Questions (FAQ)

Q: Can BZX55B11-TAP directly replace BZX55A11-TAP?

A: Yes. BZX55B11-TAP is a direct substitute manufactured by Vishay with identical zener voltage (11 V), power rating (500 mW), and package (DO-35). The tolerance differs (±2% versus ±1%), and the operating temperature range is expanded. Both parts maintain AEC-Q101 qualification and ROHS3 compliance.

Q: What is the difference between ±1%, ±2%, and ±5% tolerance parts?

A: Tolerance specifies the allowable deviation of the zener voltage from the nominal 11 V specification. ±1% tolerance (BZX55A11-TAP) allows ±0.11 V deviation. ±2% tolerance (BZX55B11-TAP, 1N6001C) allows ±0.22 V deviation. ±5% tolerance (1N5241B TR PBFREE, 1N5737B, 1N6001B) allows ±0.55 V deviation. Tighter tolerance provides more precise voltage regulation but may have higher cost or longer lead times.

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

A: Yes. All listed substitute parts use the DO-204AH (DO-35) axial through-hole package, ensuring mechanical and electrical compatibility with the original BZX55A11-TAP footprint.

Q: Which substitute is recommended for automotive applications?

A: BZX55B11-TAP is the recommended substitute for automotive applications. It maintains AEC-Q101 qualification, ROHS3 compliance, and is manufactured by Vishay with active product status and substantial inventory.

Q: What is the impact of impedance differences between substitute parts?

A: Impedance (Zzt) affects the dynamic resistance of the zener diode at specified current levels. BZX55A11-TAP specifies 20 Ω maximum impedance. Substitute parts range from 18 Ω to 22 Ω. Lower impedance (18 Ω) provides slightly better voltage regulation; higher impedance (22 Ω) has minimal impact in most applications. Differences within this range are typically acceptable for general-purpose zener applications.

Q: Can I use 1N5737B or 1N6001B if RoHS compliance is not required?

A: Yes. Both 1N5737B and 1N6001B are active products with matching 11 V zener voltage and 500 mW power rating. However, these parts lack RoHS3 compliance and AEC-Q101 qualification. Use only in applications where these certifications are not mandatory.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current affects the standby power consumption and temperature stability of the zener diode. BZX55A11-TAP specifies 100 nA @ 8.2 V. 1N5241B TR PBFREE specifies 2 µA @ 8.4 V, which is 20 times higher. For low-power or precision applications, lower leakage current is preferable. For general-purpose applications, this difference is typically negligible.

Q: Why does BZX55A11-TAP have a narrower operating temperature range than some substitutes?

A: The original BZX55A11-TAP specifies only the upper temperature limit (175°C), while substitute parts specify the full range (-65°C to 175°C or -65°C to 200°C). This reflects different datasheet documentation practices. The substitutes provide expanded temperature specifications, which is advantageous for applications requiring operation at lower temperatures.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message