BZX85C36-T50R Equivalent & Substitute Parts

Part Overview

The BZX85C36-T50R is a 36 V, 1 W Zener diode manufactured by onsemi in a through-hole DO-41 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part operates across a temperature range of -65°C to 200°C with a nominal Zener voltage of 36 V at ±6% tolerance and maximum impedance of 40 Ohms. Substitution is required to maintain circuit functionality using active, readily available alternatives.

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 (Vf) (Max) @ If	1.2 V @ 200 mA	-
Operating Temperature	-65°C ~ 200°C	-
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Product Status	Obsolete	-

Substitute Part Grouping Explanation

Substitution of the BZX85C36-T50R is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 36 V (exact match required)
Mounting Type: Through Hole (mechanical compatibility)
Package / Case: DO-41 or equivalent axial package (physical fit)

Secondary Compatibility Factors:

Power - Max: Equal to or greater than 1 W
Tolerance: ±5% or ±6% (voltage regulation accuracy)
Operating Temperature: Must encompass or match the required range
Impedance (Max): Lower impedance values provide improved performance
Current - Reverse Leakage: Lower values indicate better diode characteristics

Substitute parts are grouped into three categories based on power rating and package configuration: 1 W to 1.5 W rated devices in DO-41 packages (direct replacements), higher power devices (3 W to 5 W) for applications requiring increased thermal capacity, and alternative package configurations maintaining 36 V Zener voltage specification.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Operating Temp	Package	Product Status
BZX85C36-T50R	onsemi	36 V	±6%	1 W	40 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-41	Obsolete
1N4753A	Lumimax Optoelectronic Technology	36 V	±5%	1 W	50 Ω	1.2 V @ 200 mA	-65°C ~ 200°C	DO-41G	Active
BZX85C36-TR	Vishay General Semiconductor - Diodes Division	36 V	±5%	1.3 W	40 Ω	-	-55°C ~ 175°C	DO-41	Active
1EZ36D5-TP	Micro Commercial Co	36 V	±5%	1 W	50 Ω	1.2 V @ 200 mA	-55°C ~ 150°C	DO-41	Active
1N5938BP-TP	Micro Commercial Co	36 V	±5%	1.5 W	38 Ω	1.5 V @ 200 mA	-55°C ~ 175°C	DO-41	Active
2EZ36D5	Microsemi Corporation	36 V	±5%	2 W	25 Ω	1.2 V @ 200 mA	-65°C ~ 150°C	DO-41	Active
1N5938BRLG	onsemi	36 V	±5%	3 W	38 Ω	1.5 V @ 200 mA	-65°C ~ 200°C	Axial	Active
1N5938B3P-AP	Micro Commercial Co	36 V	±5%	3 W	38 Ω	1.5 V @ 200 mA	-55°C ~ 175°C	DO-41	Active
1N5938B3P-TP	Micro Commercial Co	36 V	±5%	3 W	38 Ω	1.5 V @ 200 mA	-55°C ~ 175°C	DO-41	Active
1N5079	Microchip Technology	36 V	±5%	3 W	21 Ω	-	-65°C ~ 175°C	Axial	Active
1N5365B	Microsemi Corporation	36 V	±5%	5 W	11 Ω	1.2 V @ 1 A	-65°C ~ 150°C	T-18	Active

Engineering Selection Recommendations

Direct Replacement (1 W Power Rating, DO-41 Package):

The 1N4753A, 1EZ36D5-TP, and BZX85C36-TR are direct functional replacements for the BZX85C36-T50R. All three maintain the 36 V Zener voltage specification, through-hole DO-41 package configuration, and 1 W to 1.3 W power rating. The 1N4753A and 1EZ36D5-TP are active products with standard availability. The BZX85C36-TR is an active Vishay product with AEC-Q101 automotive qualification and ROHS3 compliance, suitable for applications requiring automotive-grade components.

Enhanced Performance Alternatives (1.5 W to 2 W Power Rating, DO-41 Package):

The 1N5938BP-TP and 2EZ36D5 provide increased power dissipation capacity while maintaining DO-41 package compatibility. The 1N5938BP-TP offers 1.5 W rating with ROHS3 compliance. The 2EZ36D5 provides 2 W rating with improved impedance characteristics (25 Ω maximum) and ROHS3 compliance. These alternatives are suitable for applications with higher thermal requirements or improved voltage regulation performance.

Higher Power Alternatives (3 W to 5 W Power Rating):

The 1N5938BRLG, 1N5938B3P-AP, 1N5938B3P-TP, 1N5079, and 1N5365B are higher power variants maintaining 36 V Zener voltage. The 1N5938BRLG is an onsemi product with 3 W rating and operating temperature range matching the original part (-65°C to 200°C). The 1N5365B provides maximum power dissipation at 5 W with lowest impedance (11 Ω), suitable for demanding voltage regulation applications. Higher power devices are selected when circuit design requires increased thermal margin or when the original 1 W specification proves insufficient.

Compliance and Availability:

All substitute parts listed are active products with current manufacturing status. The BZX85C36-TR carries AEC-Q101 automotive qualification. Multiple parts carry ROHS3 compliance certification. Selection should prioritize active products with established supply chain availability and compliance certifications matching application requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1N4753A directly replace the BZX85C36-T50R?

A: Yes. The 1N4753A maintains identical 36 V Zener voltage, 1 W power rating, and DO-41 package configuration. Operating temperature range is identical (-65°C to 200°C). Tolerance is ±5% compared to ±6% on the original part, providing equivalent or superior voltage regulation accuracy.

Q: What is the difference between DO-41 and DO-41G packages?

A: Both designations refer to the same physical package configuration (DO-204AL axial package). The "G" suffix on DO-41G indicates a specific supplier variant. Mechanical and electrical compatibility is maintained between these designations.

Q: Can I use a 3 W Zener diode as a substitute for the 1 W BZX85C36-T50R?

A: Yes. Higher power-rated Zener diodes (3 W, 5 W) are functionally compatible substitutes when the 36 V Zener voltage and through-hole mounting type are maintained. Higher power ratings provide increased thermal capacity and improved performance margin. Package configuration must be verified for physical fit in the circuit board layout.

Q: Why does the BZX85C36-TR have a narrower operating temperature range (-55°C to 175°C) compared to the original part (-65°C to 200°C)?

A: The BZX85C36-TR is specified for automotive applications with AEC-Q101 qualification. The narrower temperature range reflects automotive-grade specifications. Selection depends on application temperature requirements. For applications requiring the full -65°C to 200°C range, alternative parts such as the 1N4753A or 1N5938BRLG are appropriate.

Q: What does impedance (Zzt) mean in Zener diode specifications?

A: Impedance (Zzt) is the maximum dynamic impedance of the Zener diode in the reverse breakdown region. Lower impedance values indicate better voltage regulation performance and lower output impedance. The BZX85C36-T50R specifies 40 Ω maximum impedance. Substitute parts with lower impedance (such as 2EZ36D5 at 25 Ω or 1N5365B at 11 Ω) provide improved regulation characteristics.

Q: Is the 1N5365B suitable for my application if I need a DO-41 package?

A: The 1N5365B is packaged in T-18 (axial) configuration, not DO-41. While the 36 V Zener voltage is maintained, the physical package differs. Verify circuit board layout compatibility before selection. For DO-41 package requirement, select from 1N4753A, BZX85C36-TR, 1EZ36D5-TP, 1N5938BP-TP, 2EZ36D5, or the 3 W variants 1N5938B3P-AP and 1N5938B3P-TP.

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

A: Reverse leakage current indicates the small current flowing through the Zener diode when reverse-biased below the breakdown voltage. Lower leakage current values indicate better diode quality and lower power consumption in standby conditions. The BZX85C36-T50R specifies 500 nA at 25 V. Substitute parts with comparable or lower leakage current (such as 2EZ36D5 at 500 nA or 1N5365B at 500 nA) maintain equivalent performance characteristics.

Q: Are all listed substitute parts RoHS compliant?

A: Most substitute parts carry ROHS3 compliance certification. The 1N5365B is marked as RoHS non-compliant. Verify RoHS compliance requirements for your application before final part selection. The BZX85C36-TR, 1N5938BP-TP, and 2EZ36D5 explicitly carry ROHS3 compliance certification.

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