BZX55F30-TR Equivalent & Substitute Parts

Part Overview

The BZX55F30-TR is a 30 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in a through-hole DO-35 package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. The part carries automotive-grade qualification (AEC-Q101) and ROHS3 compliance. Substitute parts must maintain electrical equivalence across voltage regulation, power dissipation, and thermal characteristics while accommodating available packaging and product status options.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	30	V
Power - Maximum	500	mW
Impedance (Maximum)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA
Voltage - Forward (Maximum)	1.5	V @ 200 mA
Operating Temperature Range	-65 to 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 BZX55F30-TR is determined by equivalence in the following critical parameters:

Electrical Equivalence Requirements:

Zener voltage: 30 V nominal
Maximum power dissipation: 500 mW
Package type: DO-35 (DO-204AH) through-hole axial configuration
Reverse leakage current: 100 nA at specified reverse voltage
Operating temperature range: minimum -65°C to 175°C

Tolerance Considerations: Zener voltage tolerance varies among substitute parts (±1%, ±2%, ±5%). Parts with wider tolerances (±5%) remain functionally equivalent for applications where the ±1% tolerance of the original part is not a design-critical requirement.

Impedance Variation: Maximum impedance ranges from 49 to 80 Ohms across substitute options. Impedance differences affect transient response and noise characteristics but do not preclude functional substitution in standard voltage regulation applications.

Compliance and Availability: Product status transitions from obsolete (BZX55F30-TR) to active status in substitute parts ensure long-term supply continuity. RoHS compliance status varies; ROHS3-compliant options are available for regulated applications.

Parameter Comparison

Parameter	BZX55F30-TR	BZX55B30-TAP	1N5747D	1N5256B TR PBFREE	1N6011B
Manufacturer	Vishay	Vishay	Microchip	Central Semiconductor	Microchip
Voltage - Zener (Nom)	30 V	30 V	30 V	30 V	30 V
Tolerance	±1%	±2%	±1%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	80 Ω	80 Ω	80 Ω	49 Ω	78 Ω
Current - Reverse Leakage @ Vr	100 nA @ 22 V	100 nA @ 22 V	100 nA @ 21 V	100 nA @ 23 V	100 nA @ 23 V
Voltage - Forward (Max)	1.5 V @ 200 mA	1.5 V @ 200 mA	900 mV @ 10 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	175°C	-65 to 175°C	-65 to 175°C	-65 to 200°C	-65 to 175°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	RoHS non-compliant
AEC-Q101	Yes	Yes	No	No	No
Package	DO-35	DO-35	DO-35	DO-35	DO-35

Engineering Selection Recommendations

Primary Substitute: BZX55B30-TAP

The BZX55B30-TAP is the direct successor within the Vishay BZX55 series. It maintains active product status, ROHS3 compliance, and AEC-Q101 automotive qualification. The ±2% tolerance represents a minor deviation from the original ±1% specification. This part is recommended for applications requiring automotive-grade certification and regulatory compliance continuity.

Secondary Substitute: 1N5747D

The 1N5747D, manufactured by Microchip Technology, provides ±1% tolerance matching the original part specification. It maintains active product status and supports the full -65°C to 175°C operating temperature range. However, this part does not carry AEC-Q101 qualification and is RoHS non-compliant. Selection of this part is appropriate for non-automotive applications where tolerance precision is critical and compliance requirements are less stringent.

Alternative Substitute: 1N5256B TR PBFREE

The 1N5256B TR PBFREE, manufactured by Central Semiconductor Corp, offers ROHS3 compliance and an extended operating temperature range to 200°C. The ±5% tolerance and lower impedance (49 Ω) represent trade-offs in precision but may be acceptable for applications with relaxed voltage regulation tolerances. This part lacks AEC-Q101 qualification.

Alternative Substitute: 1N6011B

The 1N6011B, manufactured by Microchip Technology, provides ±5% tolerance and active product status. Operating temperature range matches the original specification (-65°C to 175°C). This part is RoHS non-compliant and lacks AEC-Q101 qualification, limiting its use to non-regulated applications.

Frequently Asked Questions (FAQ)

Q: Can BZX55B30-TAP directly replace BZX55F30-TR in automotive applications?

A: Yes. Both parts carry AEC-Q101 qualification and ROHS3 compliance. The ±2% tolerance of BZX55B30-TAP is tighter than the ±5% tolerance of alternative substitutes. Verify that the application design accommodates the ±2% tolerance specification.

Q: What is the difference between the packaging designations "Cut Tape (CT)" and "Bulk"?

A: Cut Tape (CT) packaging supplies components on continuous tape suitable for automated pick-and-place assembly. Bulk packaging supplies loose components. Both formats contain identical electrical components; packaging selection depends on assembly process requirements.

Q: Does the impedance difference between 1N5256B TR PBFREE (49 Ω) and the original part (80 Ω) affect circuit performance?

A: Impedance affects transient response and high-frequency noise characteristics. Lower impedance (49 Ω) provides faster transient response. For standard voltage regulation applications, this difference is typically not performance-limiting. Verify impedance requirements for noise-sensitive applications.

Q: Why do some substitute parts lack AEC-Q101 qualification?

A: AEC-Q101 qualification requires automotive-grade testing and reliability documentation. Parts from manufacturers without automotive product lines (such as 1N5747D, 1N6011B) do not carry this certification. Use non-qualified parts only in non-automotive applications or where automotive qualification is not a design requirement.

Q: Is RoHS compliance mandatory for all applications?

A: RoHS compliance is mandatory for products sold in regulated markets (EU, China, and others). ROHS3-compliant substitutes (BZX55B30-TAP, 1N5256B TR PBFREE) are required for regulated applications. Non-compliant parts (1N5747D, 1N6011B) are acceptable only for non-regulated markets or legacy systems.

Q: Can I use 1N5256B TR PBFREE in place of BZX55F30-TR if the application tolerates ±5% voltage variation?

A: Yes, provided the application does not require AEC-Q101 qualification. The ±5% tolerance, lower impedance (49 Ω), and extended temperature range (to 200°C) are acceptable trade-offs for applications with relaxed precision requirements.

Q: What is the significance of the operating temperature range difference between parts?

A: BZX55B30-TAP, 1N5747D, and 1N6011B specify -65°C to 175°C. 1N5256B TR PBFREE extends to 200°C. The original BZX55F30-TR specifies only 175°C maximum. For applications operating near or above 175°C, 1N5256B TR PBFREE provides additional thermal margin.

Q: Are all substitute parts pin-compatible with the original BZX55F30-TR?

A: Yes. All substitute parts use the DO-35 (DO-204AH) axial through-hole package with identical pin configuration and mechanical dimensions.

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