BZX85C30 Equivalent & Substitute Parts

Part Overview

The BZX85C30 is a 30 V, 1 W Zener diode manufactured by onsemi in DO-204AL (DO-41) axial through-hole package. This component is classified as obsolete, though 801 pieces remain in stock. The BZX85C30 is ROHS3 compliant and operates across a temperature range of -65°C to 200°C. Due to its obsolete status, equivalent and substitute parts with active product status are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	30	V
Power - Maximum	1	W
Tolerance	±7%	%
Impedance (Maximum)	30	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 21 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 200	°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial

Substitute Part Grouping Explanation

Substitution of the BZX85C30 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nominal): 30 V
Power - Maximum: 1 W or greater
Mounting Type: Through Hole
Package / Case: DO-204AL (DO-41) or compatible axial package

Secondary Compatibility Factors:

Tolerance: ±7% or tighter
Impedance (Maximum): 30 Ohms or lower
Current - Reverse Leakage: 500 nA or lower at specified voltage
Voltage - Forward (Maximum): 1.2 V or lower at 200 mA
Operating Temperature Range: Must encompass or exceed -65°C to 200°C

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (1 W Power Rating) Parts with 1 W power rating in DO-41 package, matching the primary electrical specifications of the BZX85C30.

Category 2: Higher Power Alternatives (5 W Power Rating) Parts with increased power dissipation capability, suitable for applications requiring greater thermal headroom while maintaining 30 V zener voltage.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance (%)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (V)	Temp Range (°C)	Package	Status
BZX85C30	onsemi	30	1	±7	30	500 @ 21 V	1.2 @ 200 mA	-65 to 200	DO-41	Obsolete
1N4751A	Lumimax Optoelectronic Technology	30	1	±5	40	5000 @ 22.8 V	1.2 @ 200 mA	-65 to 200	DO-41G	Active
BZX85C30-TAP	Vishay General Semiconductor - Diodes Division	30	1.3	±5	30	500 @ 22 V	1.2 @ 200 mA	-55 to 175	DO-41	Active
1N3031B-1	Microchip Technology	30	1	±5	40	10000 @ 22.8 V	1.2 @ 200 mA	-55 to 175	DO-41	Active
1N4751AP/TR12	Microchip Technology	30	1	±5	40	5000 @ 22.8 V	1.2 @ 200 mA	-65 to 150	DO-41	Active
1N4751CE3/TR13	Microchip Technology	30	1	±2	40	5000 @ 22.8 V	1.2 @ 200 mA	-65 to 150	DO-41	Active
1N4751CP/TR12	Microchip Technology	30	1	±2	40	5000 @ 22.8 V	1.2 @ 200 mA	-65 to 150	DO-41	Active
1N4751CP/TR8	Microchip Technology	30	1	±2	40	5000 @ 22.8 V	1.2 @ 200 mA	-65 to 150	DO-41	Active
1N4751CPE3/TR12	Microchip Technology	30	1	±2	40	5000 @ 22.8 V	1.2 @ 200 mA	-65 to 150	DO-41	Active
1N4751CPE3/TR8	Microchip Technology	30	1	±2	40	5000 @ 22.8 V	1.2 @ 200 mA	-65 to 150	DO-41	Active
1N5363BRLG	onsemi	30	5	±5	8	500 @ 22.8 V	1.2 @ 1 A	-65 to 200	Axial	Active

Engineering Selection Recommendations

For Direct Replacement (1 W Power Rating):

The BZX85C30-TAP manufactured by Vishay General Semiconductor - Diodes Division is the primary direct substitute. This part maintains the 30 V zener voltage, 1.3 W power rating, DO-41 package, and identical impedance specification (30 Ohms). The BZX85C30-TAP carries active product status, ROHS3 compliance, and AEC-Q101 automotive qualification. Operating temperature range is -55°C to 175°C, which covers the majority of industrial applications, though it does not extend to the full -65°C to 200°C range of the original BZX85C30.

The 1N4751 series from Microchip Technology (part numbers 1N4751AP/TR12, 1N4751CE3/TR13, 1N4751CP/TR12, 1N4751CP/TR8, 1N4751CPE3/TR12, 1N4751CPE3/TR8) provides active alternatives with tighter tolerance specifications (±2% to ±5%). These parts are available in tape and reel packaging and maintain the 30 V zener voltage and 1 W power rating. Operating temperature range is -65°C to 150°C. The 1N4751CE3/TR13 and 1N4751CPE3 variants carry ROHS3 compliance.

The 1N4751A from Lumimax Optoelectronic Technology offers active status with ±5% tolerance and full -65°C to 200°C operating range, matching the temperature capability of the original BZX85C30.

The 1N3031B-1 from Microchip Technology is an active alternative with ±5% tolerance and DO-41 package, though it operates only to -55°C to 175°C.

For Higher Power Applications (5 W Power Rating):

The 1N5363BRLG manufactured by onsemi provides a higher power alternative at 5 W dissipation with 30 V zener voltage. This part maintains active product status, ROHS3 compliance, and operates across -65°C to 200°C. The axial package and lower impedance (8 Ohms) make this suitable for applications requiring greater thermal margin.

Compliance Considerations:

All substitute parts listed maintain REACH Unaffected status and EAR99 ECCN classification. ROHS3 compliance is available in multiple variants (BZX85C30-TAP, 1N4751CE3/TR13, 1N4751CPE3/TR12, 1N4751CPE3/TR8, 1N5363BRLG). Non-compliant alternatives exist but should be evaluated against specific design requirements.

Frequently Asked Questions (FAQ)

Q: Can the BZX85C30 be replaced with any 30 V Zener diode?

A: No. Substitution requires matching the 30 V zener voltage, 1 W minimum power rating, through-hole mounting type, and DO-41 package configuration. Additional parameters including impedance, reverse leakage current, and forward voltage must fall within acceptable ranges for the application.

Q: What is the difference between the 1 W and 5 W alternatives?

A: The 1 W alternatives (1N4751 series, 1N3031B-1, 1N4751A) maintain the same power dissipation capability as the BZX85C30. The 5 W alternative (1N5363BRLG) provides five times greater power dissipation, suitable for applications with higher current or thermal requirements. Both categories maintain the 30 V zener voltage specification.

Q: Does the operating temperature range affect substitution?

A: Yes. The BZX85C30 operates from -65°C to 200°C. Substitute parts with narrower ranges (-55°C to 175°C or -65°C to 150°C) may not be suitable for applications requiring the full original temperature specification. The 1N4751A and 1N5363BRLG maintain the full -65°C to 200°C range.

Q: What is the significance of tolerance specifications?

A: The BZX85C30 carries ±7% tolerance. Substitute parts with ±5% or ±2% tolerance provide tighter voltage regulation. Applications requiring precise zener voltage should select parts with ±2% tolerance (1N4751CE3/TR13, 1N4751CP/TR12, 1N4751CP/TR8, 1N4751CPE3/TR12, 1N4751CPE3/TR8).

Q: Are tape and reel packaged parts compatible with through-hole assembly?

A: Yes. Tape and reel (TR) packaging is a delivery format for through-hole components. Parts such as 1N4751AP/TR12, 1N4751CE3/TR13, 1N4751CP/TR12, 1N4751CP/TR8, 1N4751CPE3/TR12, and 1N4751CPE3/TR8 are supplied on tape and reel but are identical through-hole components suitable for standard PCB assembly processes.

Q: Which substitute offers the best compliance profile?

A: The BZX85C30-TAP from Vishay carries ROHS3 compliance and AEC-Q101 automotive qualification, making it suitable for regulated applications. Among the 1N4751 series, the 1N4751CE3/TR13 and 1N4751CPE3 variants carry ROHS3 compliance. The 1N5363BRLG also maintains ROHS3 compliance.

Q: Can impedance differences affect circuit performance?

A: Yes. The BZX85C30 specifies 30 Ohms maximum impedance. Substitute parts with higher impedance (40 Ohms for 1N4751 series and 1N3031B-1) may exhibit slightly different dynamic response characteristics. The 1N5363BRLG with 8 Ohms impedance provides superior dynamic performance. Application-specific circuit analysis is necessary to determine acceptable impedance ranges.

Q: What is the reverse leakage current significance?

A: The BZX85C30 specifies 500 nA reverse leakage at 21 V. Higher leakage currents in substitute parts (5 µA to 10 µA) may affect circuit performance in high-impedance applications. Applications sensitive to leakage current should prioritize parts with lower specifications or conduct circuit validation.

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