CMPZ5258B BK PBFREE Zener Diode 36V 350mW Equivalent & Substitute Parts

Part Overview

The CMPZ5258B BK PBFREE is a 36V 350mW Zener diode manufactured by Central Semiconductor Corp in SOT-23 surface mount package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. The part operates across -65°C to 150°C temperature range with ±5% voltage tolerance and 70 Ohms maximum impedance. Substitute parts are necessary when the original component becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when enhanced electrical specifications (tighter tolerances, lower impedance) are needed for specific circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	36	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	70	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 27 V	-
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	-
Operating Temperature	-65 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 CMPZ5258B BK PBFREE is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): Must equal 36V
Package / Case: Must be TO-236-3, SC-59, or SOT-23-3 (physically compatible)
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must encompass or match -65°C to 150°C
RoHS Status: Must be ROHS3 Compliant

Secondary Compatibility Parameters:

Power - Max: Substitute must be ≥350mW (equal or higher power rating acceptable)
Impedance (Max): Substitute must be ≤70 Ohms (lower impedance acceptable)
Tolerance: Substitute tolerance must be ±5% or tighter (±1%, ±2% acceptable)
Voltage - Forward (Vf): Must be ≤900mV @ 10mA
Current - Reverse Leakage: Must be ≤100nA @ 27V

Substitute parts are grouped into two categories: Direct Pin-Compatible Substitutes (identical SOT-23-3 package) and Functional Equivalents (alternative packages with same electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Status	Automotive Grade
CMPZ5258B BK PBFREE	Central Semiconductor Corp	36	±5%	350	70	SOT-23-3	Active	-
BZX84-A36,215	Nexperia USA Inc.	36	±1%	250	90	TO-236AB	Active	AEC-Q101
BZX84-B36,215	NXP USA Inc.	36	±2%	250	90	SOT-23	Active	AEC-Q101
BZX84-C36,215	Nexperia USA Inc.	36	±5%	250	90	TO-236AB	Active	AEC-Q101
BZX84-C36,235	Nexperia USA Inc.	36	±5%	250	90	TO-236AB	Active	AEC-Q101
BZX84B36-HE3-08	Vishay General Semiconductor	36	±2%	300	90	SOT-23-3	Obsolete	AEC-Q101
BZX84C36-E3-08	Vishay General Semiconductor	36	±5%	300	90	SOT-23-3	Active	-
MMBZ5258B-7-F	Diodes Incorporated	36	±5%	350	70	SOT-23-3	Active	-
MMBZ5258BLT1G	onsemi	36	±5%	225	70	SOT-23-3	Active	-
MMBZ5258BTS-7-F	Diodes Incorporated	36	±5%	200	70	SOT-363	Active	AEC-Q101
MMBZ5258BW-7-F	Diodes Incorporated	36	±5%	200	70	SOT-23-3	Active	-

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Identical Electrical and Package Specifications):

MMBZ5258B-7-F (Diodes Incorporated) is the primary direct substitute. This part matches all critical parameters: 36V nominal voltage, ±5% tolerance, 350mW power rating, 70 Ohms impedance, and SOT-23-3 package. Product status is Active with full RoHS3 compliance. This substitute provides identical electrical performance and mechanical compatibility without design modification.

Tier 2 - Compatible Substitutes (Same Package, Reduced Power Rating):

MMBZ5258BW-7-F (Diodes Incorporated) and MMBZ5258BLT1G (onsemi) are compatible substitutes with SOT-23-3 package compatibility. Both maintain 36V specification and ±5% tolerance. Power ratings are reduced to 200mW and 225mW respectively. These substitutes are suitable for applications where the full 350mW power dissipation is not required. Both are Active status with RoHS3 compliance.

Tier 3 - Automotive-Grade Alternatives:

BZX84-C36,215 and BZX84-C36,235 (Nexperia USA Inc.) offer automotive-grade qualification (AEC-Q101) with ±5% tolerance matching the original part. These parts feature 250mW power rating and 90 Ohms impedance. Package format is TO-236AB (mechanically compatible with SOT-23-3). Both are Active status. Selection of these parts is appropriate for automotive applications requiring AEC-Q101 certification.

BZX84C36-E3-08 (Vishay General Semiconductor) provides Active status with 300mW power rating, ±5% tolerance, and SOT-23-3 package. Operating temperature range is -55°C to 150°C (narrower than original -65°C to 150°C). This substitute is suitable for applications not requiring the extended low-temperature specification.

Tier 4 - Not Recommended:

BZX84B36-HE3-08 (Vishay) carries Obsolete product status and should not be selected for new designs despite electrical compatibility.

MMBZ5258BTS-7-F is a 3-independent zener diode array in SOT-363 package. This part is not a direct substitute due to different package format and configuration, though electrical specifications align.

Frequently Asked Questions (FAQ)

Q: Can I use BZX84-C36,215 as a direct replacement for CMPZ5258B BK PBFREE?

A: BZX84-C36,215 is functionally compatible but not a direct pin-for-pin substitute. The part uses TO-236AB package format instead of SOT-23-3. While both packages are mechanically similar and fit the same PCB footprint, the supplier device package designation differs. Electrical specifications align: 36V nominal, ±5% tolerance, 900mV forward voltage, and equivalent reverse leakage. This substitute is suitable if your PCB layout accommodates TO-236AB package dimensions.

Q: What is the difference between MMBZ5258B-7-F and MMBZ5258BLT1G?

A: Both parts are manufactured by different suppliers (Diodes Incorporated vs. onsemi) and share identical 36V specification, ±5% tolerance, SOT-23-3 package, and 70 Ohms impedance. The primary difference is power rating: MMBZ5258B-7-F is rated 350mW (matching the original CMPZ5258B), while MMBZ5258BLT1G is rated 225mW. Select MMBZ5258B-7-F if your circuit requires full 350mW dissipation capability. Select MMBZ5258BLT1G only if your application power requirements are ≤225mW.

Q: Why do some substitutes have lower power ratings than the original part?

A: Lower power ratings (250mW, 300mW, 225mW, 200mW) compared to the original 350mW reflect different die designs and thermal management capabilities across manufacturers. A substitute with lower power rating is acceptable only if your circuit's actual power dissipation does not exceed that rating. Oversizing power rating (selecting 350mW when 200mW is needed) is acceptable; undersizing is not. Verify your circuit's maximum power dissipation before selecting a lower-rated substitute.

Q: Are automotive-grade parts (AEC-Q101) required for my application?

A: AEC-Q101 qualification is required only for automotive applications. BZX84-A36,215, BZX84-B36,215, BZX84-C36,215, BZX84-C36,235, BZX84B36-HE3-08, and MMBZ5258BTS-7-F carry AEC-Q101 certification. The original CMPZ5258B BK PBFREE does not specify automotive qualification. If your application is non-automotive, AEC-Q101 certification is not a requirement, though it does not prevent use in non-automotive circuits.

Q: Can I use MMBZ5258BTS-7-F (array package) instead of a single diode?

A: MMBZ5258BTS-7-F is a 3-independent zener diode array in SOT-363 package. This is not a direct substitute for single-diode applications. The SOT-363 package has 6 pins (3 diodes × 2 pins each) versus SOT-23-3's 3 pins. Use this part only if your circuit design specifically requires multiple independent zener diodes and your PCB layout accommodates SOT-363 footprint.

Q: What is the operating temperature difference between CMPZ5258B and BZX84C36-E3-08?

A: CMPZ5258B operates -65°C to 150°C. BZX84C36-E3-08 operates -55°C to 150°C. The substitute has a narrower low-temperature range (10°C higher minimum). This substitute is suitable only if your application does not require operation below -55°C. If your circuit must function at -65°C, select MMBZ5258B-7-F or MMBZ5258BW-7-F instead.

Q: What does ±1%, ±2%, and ±5% tolerance mean for zener voltage?

A: Tolerance specifies the acceptable deviation of actual zener voltage from the nominal 36V specification. ±1% tolerance means actual voltage is 35.64V to 36.36V. ±2% tolerance means 35.28V to 36.72V. ±5% tolerance means 34.2V to 37.8V. Tighter tolerance (±1%, ±2%) provides more precise voltage regulation. The original part specifies ±5%. Substitutes with tighter tolerance (±1%, ±2%) are acceptable and provide improved regulation accuracy.

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