PZM36NB,115 Zener Diode Equivalent & Substitute Parts

Part Overview

The PZM36NB,115 is a 36 V, 300 mW Zener diode manufactured by NXP USA Inc. in Surface Mount TO-236-3 (SOT-23-3) packaging. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across the temperature range of -65°C to 150°C and maintains RoHS3 compliance with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	36	V
Tolerance	±5%	-
Power - Max	300	mW
Impedance (Max)	60	Ohms
Current - Reverse Leakage @ Vr	70 nA @ 27 V	-
Voltage - Forward (Max) @ If	1.1 V @ 100 mA	-
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the PZM36NB,115 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 36 V nominal
Package type: TO-236-3 / SOT-23-3 / SC-59 (identical physical form factor)
Mounting type: Surface Mount
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance requirement

Secondary Compatibility Parameters:

Power dissipation: Minimum 225 mW (substitute parts rated 225-250 mW are acceptable for applications requiring ≤300 mW)
Voltage tolerance: ±5% to ±6% acceptable
Impedance: 60-90 Ohms acceptable range
Reverse leakage current: 50-100 nA acceptable range

All substitute parts listed maintain identical package geometry, zener voltage specification, and temperature operating range. Differences in maximum power rating, impedance, and reverse leakage current remain within acceptable engineering tolerances for 36 V zener diode applications.

Parameter Comparison

Parameter	PZM36NB,115 (Main)	BZX84-C36,215	BZX84C36LT1G	SZBZX84C36ET1G	SZBZX84C36LT1G	SZMMBZ5258BLT1G
Manufacturer	NXP USA Inc.	Nexperia USA Inc.	onsemi	onsemi	onsemi	onsemi
Voltage - Zener (Nom)	36 V	36 V	36 V	36 V	36 V	36 V
Tolerance	±5%	±5%	±6%	±6%	±5%	±5%
Power - Max	300 mW	250 mW	225 mW	225 mW	250 mW	225 mW
Impedance (Max)	60 Ohms	90 Ohms	90 Ohms	90 Ohms	90 Ohms	70 Ohms
Current - Reverse Leakage @ Vr	70 nA @ 27 V	50 nA @ 25.2 V	50 nA @ 25.2 V	50 nA @ 25.2 V	50 nA @ 25.2 V	100 nA @ 27 V
Voltage - Forward (Max) @ If	1.1 V @ 100 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Package / Case	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3	TO-236-3, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	-	Automotive	-	Automotive	Automotive	Automotive
Qualification	-	AEC-Q101	-	AEC-Q101	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

Primary Recommendation: SZBZX84C36LT1G

The SZBZX84C36LT1G is the preferred substitute for the obsolete PZM36NB,115. This part maintains the 36 V zener voltage specification with ±5% tolerance matching the original component. The 250 mW maximum power rating accommodates applications designed for the original 300 mW part. Automotive-grade qualification (AEC-Q101) and active product status ensure long-term availability and supply chain stability. Impedance of 90 Ohms and reverse leakage of 50 nA @ 25.2 V remain within acceptable engineering tolerances.

Secondary Recommendation: BZX84-C36,215

The BZX84-C36,215 from Nexperia USA Inc. provides an alternative with identical electrical specifications to SZBZX84C36LT1G. Automotive-grade qualification and AEC-Q101 certification support applications requiring automotive-level reliability. The 250 mW power rating and ±5% tolerance match the original component's core specifications.

Alternative Options: BZX84C36LT1G, SZBZX84C36ET1G, SZMMBZ5258BLT1G

These parts provide functional equivalence with minor parameter variations. BZX84C36LT1G and SZBZX84C36ET1G feature ±6% tolerance and 225 mW power rating, suitable for applications with relaxed power requirements. SZMMBZ5258BLT1G offers 225 mW power with ±5% tolerance and 70 Ohms impedance, providing an intermediate option between the primary recommendations and lower-power alternatives.

All substitute parts maintain RoHS3 compliance, identical package geometry (TO-236-3 / SOT-23-3), and the required -65°C to 150°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the PZM36NB,115 be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts share identical package geometry (TO-236-3 / SOT-23-3), zener voltage (36 V), and operating temperature range (-65°C to 150°C). Direct PCB-level substitution is possible without layout modifications.

Q: What is the significance of the power rating difference between the original 300 mW and substitute parts rated 225-250 mW?

A: The substitute parts are rated for lower maximum power dissipation. Applications designed for the original 300 mW part can use 250 mW substitutes without functional impact, provided the actual operating power remains below 250 mW. For applications requiring the full 300 mW capability, verify actual power dissipation requirements before substitution.

Q: Why do some substitute parts have ±6% tolerance instead of ±5%?

A: Tolerance variation reflects different manufacturer specifications. Both ±5% and ±6% tolerances are acceptable for 36 V zener applications. The ±5% tolerance parts (SZBZX84C36LT1G, BZX84-C36,215, SZMMBZ5258BLT1G) provide tighter voltage regulation if required by circuit design.

Q: What is the difference between automotive-grade and standard-grade zener diodes?

A: Automotive-grade parts (BZX84-C36,215, SZBZX84C36ET1G, SZBZX84C36LT1G, SZMMBZ5258BLT1G) carry AEC-Q101 qualification, indicating compliance with automotive reliability and environmental stress testing standards. Standard-grade parts (BZX84C36LT1G) meet general industrial requirements. Automotive-grade parts are recommended for applications requiring enhanced reliability.

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

A: Yes. All substitute parts use TO-236-3 / SOT-23-3 / SC-59 surface mount packaging. Tape & Reel (TR) packaging is standard for all active parts, ensuring compatibility with automated assembly processes.

Q: How does impedance affect zener diode substitution?

A: Impedance (Zzt) affects voltage regulation quality under varying load conditions. The original part specifies 60 Ohms maximum; substitute parts range from 70-90 Ohms. This variation is acceptable for most applications. Circuits requiring precise voltage regulation at specific impedance values should verify compatibility with actual load characteristics.

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

A: Reverse leakage current affects standby power consumption and temperature stability. The original part specifies 70 nA @ 27 V; substitutes range from 50-100 nA. These differences are negligible for most applications. High-impedance circuits or precision analog applications should verify leakage specifications against circuit requirements.

Q: Is the forward voltage specification critical for substitution?

A: Forward voltage (Vf) is relevant only when the zener diode operates in forward-biased mode. The original part specifies 1.1 V @ 100 mA; substitutes specify 900 mV @ 10 mA at different test conditions. These differences do not affect zener regulation performance in reverse-biased operation.

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