BZX85C36 Zener Diode 36V 1W Equivalent & Substitute Parts

Part Overview

The BZX85C36 is a through-hole zener diode rated for 36 V nominal voltage and 1 W maximum power dissipation, manufactured by onsemi in the DO-204AL (DO-41) axial package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Zener diodes in this voltage and power class are used for voltage regulation, overvoltage protection, and reference applications in electronic circuits. The 36 V rating and 1 W power handling capability define the functional requirements for direct substitution.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	36	V
Tolerance	±6%	—
Power - Max	1	W
Impedance (Max)	40	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 25 V
Voltage - Forward (Max) @ 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 BZX85C36 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 36 V nominal
Maximum power rating: 1 W or greater
Package type: DO-204AL / DO-41 axial through-hole
Operating temperature range: Must encompass or exceed -65°C to 200°C

Secondary Compatibility Factors:

Voltage tolerance: ±6% or tighter acceptable
Impedance (Zzt): Maximum 40 Ohms or lower preferred
Reverse leakage current: 500 nA or lower at rated voltage
Forward voltage: 1.2 V or lower at 200 mA

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (1 W rated): Parts with 1 W power rating, matching impedance and leakage specifications, suitable for direct pin-for-pin replacement.

Category B - Enhanced Performance (≥1 W rated): Parts with power ratings exceeding 1 W, offering improved thermal margin and reliability while maintaining electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Reverse Leakage	Vf (Max)	Temp Range (°C)	Package	Status
BZX85C36	onsemi	36	±6%	1	40	500 nA @ 25 V	1.2 V @ 200 mA	-65 to 200	DO-41	Obsolete
1N4753A	Lumimax Optoelectronic Technology	36	±5%	1	50	5 µA @ 27.4 V	1.2 V @ 200 mA	-65 to 200	DO-41G	Active
1N5938BRLG	onsemi	36	±5%	3	38	1 µA @ 27.4 V	1.5 V @ 200 mA	-65 to 200	Axial	Active
BZX85C36-TR	Vishay General Semiconductor - Diodes Division	36	±5%	1.3	40	500 nA @ 27 V	—	-55 to 175	DO-41	Active
1EZ36D5-TP	Micro Commercial Co	36	±5%	1	50	5 µA @ 27.4 V	1.2 V @ 200 mA	-55 to 150	DO-41	Active
1N3033B-1	Microchip Technology	36	±5%	1	50	10 µA @ 27.4 V	1.2 V @ 200 mA	-55 to 175	DO-41	Active
1N4753AP/TR12	Microchip Technology	36	±5%	1	50	5 µA @ 27.4 V	1.2 V @ 200 mA	-65 to 150	DO-41	Active
1N4753CE3/TR13	Microchip Technology	36	±2%	1	50	5 µA @ 27.4 V	1.2 V @ 200 mA	-65 to 150	DO-41	Active
1N4753CP/TR12	Microchip Technology	36	±2%	1	50	5 µA @ 27.4 V	1.2 V @ 200 mA	-65 to 150	DO-41	Active
1N4753CP/TR8	Microchip Technology	36	±2%	1	50	5 µA @ 27.4 V	1.2 V @ 200 mA	-65 to 150	DO-41	Active
1N4753CPE3/TR12	Microchip Technology	36	±2%	1	50	5 µA @ 27.4 V	1.2 V @ 200 mA	-65 to 150	DO-41	Active

Engineering Selection Recommendations

Primary Substitute - BZX85C36-TR (Vishay General Semiconductor - Diodes Division)

The BZX85C36-TR is the most direct substitute for the obsolete BZX85C36. Both parts share the same base part number designation and are manufactured to identical electrical specifications: 36 V nominal zener voltage, 1.3 W power rating (exceeding the original 1 W), and DO-41 package. The BZX85C36-TR carries AEC-Q101 automotive qualification and ROHS3 compliance, indicating active production status and long-term availability. The impedance specification of 40 Ohms matches the original part exactly. Operating temperature range is -55°C to 175°C, which covers the majority of industrial applications, though it does not extend to the original -65°C lower limit or 200°C upper limit.

Secondary Substitute - 1N4753AP/TR12 (Microchip Technology)

The 1N4753AP/TR12 provides a fully compatible alternative with 36 V nominal voltage, 1 W power rating, and DO-41 package. This part is actively produced and widely available. Electrical parameters are equivalent: 1.2 V forward voltage at 200 mA and 50 Ohms impedance. The ±5% tolerance is tighter than the original ±6%. Operating temperature range extends to -65°C, matching the original lower limit, though the upper limit is 150°C rather than 200°C. This part is suitable for applications not requiring the full 200°C upper temperature specification.

Enhanced Performance Substitute - 1N5938BRLG (onsemi)

The 1N5938BRLG offers superior thermal performance with a 3 W power rating, double the original specification. Manufactured by onsemi (the original BZX85C36 manufacturer), this part maintains 36 V nominal voltage and DO-41 axial package compatibility. The 38 Ohms impedance is superior to the original 40 Ohms specification. This part is recommended for applications requiring improved thermal margin or where power dissipation margins are critical. Operating temperature range is -65°C to 200°C, fully matching the original specification.

Compliance and Availability Considerations

All recommended substitutes are in active production status with substantial inventory availability. The BZX85C36-TR and 1N5938BRLG carry RoHS3 compliance certifications. The 1N4753AP/TR12 is RoHS non-compliant but remains widely available. All parts are REACH unaffected and classified under ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can the 1N5938BRLG (3 W) be used as a direct replacement for the BZX85C36 (1 W)?

A: Yes. The 1N5938BRLG maintains the same 36 V nominal zener voltage, DO-41 axial package, and operating temperature range (-65°C to 200°C). The higher power rating (3 W versus 1 W) does not create compatibility issues; it provides additional thermal margin. The impedance specification (38 Ohms) is superior to the original (40 Ohms). This substitution is electrically and mechanically valid.

Q: What is the difference between the 1N4753AP/TR12 and 1N4753CE3/TR13?

A: Both parts are 36 V, 1 W zener diodes in DO-41 packages manufactured by Microchip Technology. The primary difference is voltage tolerance: 1N4753AP/TR12 has ±5% tolerance, while 1N4753CE3/TR13 has ±2% tolerance. The 1N4753CE3/TR13 offers tighter voltage regulation. Both are electrically compatible with the BZX85C36. Selection depends on tolerance requirements for the application.

Q: Does the BZX85C36-TR meet the full operating temperature range of the original BZX85C36?

A: The BZX85C36-TR operates from -55°C to 175°C, which does not extend to the original -65°C lower limit or 200°C upper limit. For applications requiring operation at -65°C or above 175°C, the 1N5938BRLG (-65°C to 200°C) or 1N4753AP/TR12 (-65°C to 150°C) are more suitable.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts listed are through-hole axial components in DO-41 or DO-204AL packages, maintaining mechanical compatibility with the original BZX85C36. Packaging formats vary between tape and reel (TR), cut tape (CT), and bulk, but the physical component package remains consistent.

Q: What is the significance of the impedance (Zzt) specification in zener diode selection?

A: Impedance (Zzt) defines the dynamic resistance of the zener diode in the reverse breakdown region. Lower impedance values indicate better voltage regulation and lower output impedance. The original BZX85C36 specifies 40 Ohms maximum. Substitute parts with 38 to 50 Ohms impedance are functionally compatible; lower values (38 Ohms) provide superior regulation performance.

Q: Can the 1N3033B-1 be used as a substitute?

A: The 1N3033B-1 is electrically compatible with 36 V nominal voltage, 1 W power rating, and DO-41 package. However, it carries RoHS non-compliant status and higher reverse leakage current (10 µA at 27.4 V) compared to the original (500 nA at 25 V). For new designs or applications with strict compliance requirements, the RoHS3-compliant alternatives (BZX85C36-TR, 1N4753CE3/TR13, 1N4753CPE3/TR12) are preferred.

Q: What is the difference between tape and reel (TR) and cut tape (CT) packaging?

A: Tape and reel (TR) packaging supplies components on continuous carrier tape wound on reels, suitable for automated assembly processes. Cut tape (CT) provides the same components on shorter tape segments. Both formats contain identical components; the difference is in supply format and handling for manufacturing operations. Selection depends on production volume and assembly equipment compatibility.

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