BZX84C36-TP Equivalent & Substitute Parts

Part Overview

The BZX84C36-TP is a 36 V Zener diode manufactured by Micro Commercial Co, rated for 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is classified as Active and is ROHS3 compliant. The part is used in voltage regulation and protection circuits where precise 36 V reference voltage is required. Substitute parts are identified based on matching nominal Zener voltage, compatible package geometry, and electrical performance within specified tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	36	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	90	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 25.2 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZX84C36-TP is determined by the following critical parameters:

Nominal Zener Voltage: All substitute parts must maintain 36 V nominal Zener voltage to preserve circuit reference voltage accuracy.
Package Compatibility: All substitute parts use TO-236-3, SC-59, or SOT-23-3 package geometry, ensuring mechanical and electrical compatibility with existing PCB layouts.
Voltage Tolerance: The main part specifies ±5% tolerance. Substitute parts with ±1%, ±5%, or ±6% tolerance are functionally compatible, as tighter tolerances represent improved performance.
Power Dissipation: The main part is rated for 350 mW. Substitute parts rated at 225 mW, 250 mW, 300 mW, or 350 mW are acceptable; lower power ratings require circuit verification for thermal margin.
Impedance: Maximum impedance of 70 to 90 Ohms is acceptable across all substitute parts.
Reverse Leakage Current: Specified at 50 nA to 100 nA across the temperature and voltage range; all substitutes meet this criterion.
Forward Voltage: All parts specify 900 mV maximum at 10 mA forward current.
Operating Temperature Range: The main part operates from -55°C to 150°C. Substitute parts with -65°C to 150°C range provide extended low-temperature performance.
Compliance & Certification: All substitute parts are ROHS3 compliant and REACH unaffected. Automotive-grade parts with AEC-Q101 qualification are available as enhanced alternatives.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	AEC-Q101
BZX84C36-TP	Micro Commercial Co	36 V	±5%	350 mW	90 Ω	100 nA @ 25.2 V	900 mV @ 10 mA	-55 to 150°C	SOT-23-3	—
BZX84-A36,215	Nexperia USA Inc.	36 V	±1%	250 mW	90 Ω	50 nA @ 25.2 V	900 mV @ 10 mA	-65 to 150°C	TO-236AB	Yes
BZX84-C36,215	Nexperia USA Inc.	36 V	±5%	250 mW	90 Ω	50 nA @ 25.2 V	900 mV @ 10 mA	-65 to 150°C	TO-236AB	Yes
BZX84-C36,235	Nexperia USA Inc.	36 V	±5%	250 mW	90 Ω	50 nA @ 25.2 V	900 mV @ 10 mA	-65 to 150°C	TO-236AB	Yes
BZX84C36-7-F	Diodes Incorporated	36 V	±6%	300 mW	90 Ω	100 nA @ 25.2 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	—
BZX84C36LT1G	onsemi	36 V	±6%	225 mW	90 Ω	50 nA @ 25.2 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	—
MMBZ5258B-7-F	Diodes Incorporated	36 V	±5%	350 mW	70 Ω	100 nA @ 27 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	—
MMBZ5258BW-7-F	Diodes Incorporated	36 V	±5%	200 mW	70 Ω	100 nA @ 27 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	—
SZMMBZ5258BLT1G	onsemi	36 V	±5%	225 mW	70 Ω	100 nA @ 27 V	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Yes

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical Performance)

The MMBZ5258B-7-F (Diodes Incorporated) is the closest electrical equivalent, offering identical 36 V nominal voltage, ±5% tolerance, 350 mW power rating, and SOT-23-3 package. This part provides extended operating temperature range (-65°C to 150°C) and improved impedance characteristics (70 Ω vs. 90 Ω).

Automotive-Grade Alternatives

For applications requiring automotive qualification, the BZX84-A36,215 and BZX84-C36,215 (Nexperia USA Inc.) are AEC-Q101 certified. Both maintain 36 V nominal voltage and SOT-23-compatible TO-236AB package. The BZX84-A36,215 offers superior ±1% tolerance; the BZX84-C36,215 matches the ±5% tolerance of the main part. Both are rated for 250 mW, requiring thermal margin verification in high-power applications.

Extended Temperature Range

All substitute parts operate from -65°C to 150°C, providing 10°C additional low-temperature margin compared to the main part's -55°C minimum.

Compliance Status

All substitute parts are ROHS3 compliant and REACH unaffected, matching the main part's regulatory status.

Power Derating Consideration

The MMBZ5258BW-7-F is rated for 200 mW maximum power. This part is suitable only for applications where circuit power dissipation does not exceed 200 mW.

Frequently Asked Questions (FAQ)

Q: Can I substitute BZX84C36-TP with a part rated for lower power dissipation?

A: Yes, provided circuit analysis confirms that actual power dissipation remains below the substitute part's rating. The BZX84C36LT1G (225 mW) and MMBZ5258BW-7-F (200 mW) are acceptable if thermal margins are verified. The MMBZ5258B-7-F (350 mW) and BZX84C36-7-F (300 mW) require no derating analysis.

Q: Are all substitute parts mechanically compatible with the original PCB layout?

A: Yes. All substitute parts use TO-236-3, SC-59, or SOT-23-3 package geometry. These designations are mechanically equivalent and interchangeable on standard SOT-23 PCB footprints.

Q: What is the difference between ±1%, ±5%, and ±6% tolerance specifications?

A: Tolerance defines the allowable deviation from the nominal 36 V Zener voltage. ±1% tolerance (BZX84-A36,215) provides the tightest voltage regulation, ±5% (main part and most substitutes) is standard, and ±6% (BZX84C36-7-F, BZX84C36LT1G) is acceptable for general-purpose applications. Selection depends on circuit voltage regulation requirements.

Q: Which substitute part is recommended for automotive applications?

A: The SZMMBZ5258BLT1G (onsemi) is AEC-Q101 qualified and automotive-grade, offering 36 V nominal voltage, ±5% tolerance, 225 mW power rating, and extended temperature range. Alternatively, the BZX84-A36,215 or BZX84-C36,215 (Nexperia) provide AEC-Q101 certification with 250 mW power rating.

Q: What is the significance of impedance (Zzt) values of 70 Ω versus 90 Ω?

A: Impedance affects dynamic voltage regulation under transient load conditions. Lower impedance (70 Ω) provides superior transient response. The MMBZ5258 series (70 Ω) offers improved performance compared to the BZX84 series (90 Ω) in applications with rapid current changes.

Q: Can I use BZX84-A36,215 or BZX84-C36,215 if my circuit requires 350 mW dissipation?

A: No. These parts are rated for 250 mW maximum. Using them in applications requiring 350 mW operation will cause thermal stress and potential failure. Use MMBZ5258B-7-F or BZX84C36-7-F instead.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the main part.

Q: What is the difference between reverse leakage current specifications at different voltages?

A: Reverse leakage current is temperature and voltage dependent. The main part specifies 100 nA at 25.2 V; some substitutes specify 50 nA at 25.2 V (lower leakage) or 100 nA at 27 V (slightly higher test voltage). These variations are within acceptable operating margins for voltage regulation circuits.

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