CMPZ5252B BK PBFREE Zener Diode 24V 350mW Equivalent & Substitute Parts

Part Overview

The CMPZ5252B BK PBFREE is a 24V 350mW Zener diode manufactured by Central Semiconductor Corp in SOT-23 surface mount packaging. This component is classified as an active product with ROHS3 compliance and unlimited moisture sensitivity rating. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications. Alternative equivalent parts may be required due to supply chain availability, packaging preferences, or specific manufacturer certifications for particular applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	24	V
Tolerance	±5%	-
Power - Maximum	350	mW
Impedance (Maximum)	33	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 18V
Voltage - Forward (Maximum) @ If	900	mV @ 10mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the CMPZ5252B BK PBFREE is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 24V nominal
Tolerance: ±5% or tighter
Power dissipation: minimum 350mW (or lower if application permits)
Package compatibility: SOT-23-3 / TO-236-3 / SC-59
Mounting type: Surface Mount
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance

Secondary Compatibility Factors:

Impedance (Zzt): 33 to 70 Ohms acceptable
Reverse leakage current: 50 to 100 nA range
Forward voltage: 900mV @ 10mA

Parts are grouped into three categories based on power rating alignment:

Group 1 - Full Power Match (350mW): MMBZ5252B-7-F, BZX84C24-TP Group 2 - Reduced Power (250-300mW): BZX84-B24,215, BZX84-C24,215, BZX84-C24,235, BZX84B24-7-F, BZX84C24-E3-08, BZX84C24-G3-18 Group 3 - Moderate Power (225-300mW): DDZX24C-7, MMBZ5252BLT1G

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Package	RoHS3
CMPZ5252B BK PBFREE	Central Semiconductor	24	±5%	350	33	100 @ 18V	900 @ 10mA	-65 to 150	SOT-23-3	Yes
MMBZ5252B-7-F	Diodes Incorporated	24	±5%	350	33	100 @ 18V	900 @ 10mA	-65 to 150	SOT-23-3	Yes
BZX84-B24,215	NXP Semiconductors	24	±2%	250	70	50 @ 16.8V	900 @ 10mA	-65 to 150	TO-236AB	Yes
BZX84-C24,215	NXP Semiconductors	24	±5%	250	70	50 @ 16.8V	900 @ 10mA	-65 to 150	TO-236AB	Yes
BZX84-C24,235	Nexperia USA Inc.	24	±5%	250	70	50 @ 16.8V	900 @ 10mA	-65 to 150	TO-236AB	Yes
BZX84B24-7-F	Diodes Incorporated	24	±2%	300	70	100 @ 16.8V	900 @ 10mA	-65 to 150	SOT-23-3	Yes
BZX84C24-E3-08	Vishay General Semiconductor	24	±5%	300	70	50 @ 16.8V	-	-55 to 150	SOT-23-3	Yes
BZX84C24-G3-18	Vishay General Semiconductor	24	±5%	300	70	50 @ 16.8V	-	-55 to 150	SOT-23-3	Yes
BZX84C24-TP	Micro Commercial Co	24	±5%	350	70	100 @ 16.8V	900 @ 10mA	-55 to 150	SOT-23	Yes
DDZX24C-7	Diodes Incorporated	24	±3%	300	35	50 @ 19V	900 @ 10mA	-65 to 150	SOT-23-3	Yes
MMBZ5252BLT1G	onsemi	24	±5%	225	33	100 @ 18V	900 @ 10mA	-65 to 150	SOT-23-3	Yes

Engineering Selection Recommendations

Direct Equivalent (Full Specification Match): MMBZ5252B-7-F from Diodes Incorporated is the direct equivalent to CMPZ5252B BK PBFREE. Both parts share identical electrical specifications: 24V nominal, ±5% tolerance, 350mW power rating, 33 Ohms impedance, and -65°C to 150°C operating range. Both are ROHS3 compliant with MSL 1 rating. The primary difference is packaging format (Tape & Reel vs. Bulk) and manufacturer. This part is suitable for direct substitution without circuit redesign.

Full Power Alternative (350mW): BZX84C24-TP from Micro Commercial Co maintains the 350mW power rating and ±5% tolerance. Operating temperature range is -55°C to 150°C (narrower than the main part). Impedance is 70 Ohms versus 33 Ohms in the main part. This part is suitable for applications where the -55°C lower temperature limit is acceptable and higher impedance does not affect circuit performance.

Reduced Power Alternatives (250-300mW): Parts in this category include BZX84-B24,215, BZX84-C24,215, BZX84-C24,235 (NXP/Nexperia), BZX84B24-7-F (Diodes), and BZX84C24-E3-08, BZX84C24-G3-18 (Vishay). These parts have lower power dissipation (250-300mW) compared to the 350mW main part. Selection from this group is appropriate only when circuit design permits reduced power handling. NXP parts include AEC-Q101 automotive qualification. Vishay parts have narrower temperature range (-55°C minimum).

Moderate Power Alternative (300mW with Enhanced Tolerance): DDZX24C-7 from Diodes Incorporated offers 300mW power with ±3% tolerance (tighter than ±5%). Impedance is 35 Ohms, close to the main part's 33 Ohms. Operating range is -65°C to 150°C, matching the main part. This part is suitable when tighter voltage tolerance is required and 300mW power is sufficient.

Lower Power Alternative (225mW): MMBZ5252BLT1G from onsemi provides 225mW power rating. Electrical characteristics match the main part (24V, ±5%, 33 Ohms impedance, -65°C to 150°C). This part is suitable only for applications with reduced power dissipation requirements.

All substitute parts listed are active products with ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5252B-7-F replace CMPZ5252B BK PBFREE directly? A: Yes. MMBZ5252B-7-F is a direct electrical equivalent with identical specifications: 24V nominal, ±5% tolerance, 350mW power, 33 Ohms impedance, and -65°C to 150°C operating range. The only difference is packaging format (Tape & Reel vs. Bulk) and manufacturer. No circuit modifications are required.

Q: What is the difference between parts rated 350mW and 250mW? A: Power rating indicates maximum continuous power dissipation. A 350mW part can safely dissipate more heat than a 250mW part. Selection depends on circuit current and voltage conditions. If your circuit requires more than 250mW dissipation, use 350mW or 300mW rated parts. If your circuit dissipates less than 250mW, lower-rated parts are acceptable.

Q: Are NXP BZX84-C24 parts suitable replacements? A: NXP BZX84-C24,215 and BZX84-C24,235 are suitable if your application permits 250mW power dissipation (versus 350mW in the main part). Both maintain 24V nominal, ±5% tolerance, and -65°C to 150°C operating range. These parts include AEC-Q101 automotive qualification. Higher impedance (70 Ohms vs. 33 Ohms) may affect circuit performance in sensitive applications.

Q: What does impedance (Zzt) mean in Zener diode selection? A: Impedance (Zzt) is the dynamic resistance of the Zener diode in its operating region. Lower impedance (33 Ohms) provides better voltage regulation and lower output impedance. Higher impedance (70 Ohms) results in greater voltage variation with load changes. For precision voltage regulation, prefer parts with lower impedance values.

Q: Can I use BZX84C24-E3-08 or BZX84C24-G3-18 if my circuit operates below -55°C? A: No. These Vishay parts have minimum operating temperature of -55°C. If your circuit requires operation at -65°C, use parts with -65°C minimum rating: CMPZ5252B BK PBFREE, MMBZ5252B-7-F, BZX84-B24,215, BZX84-C24,215, BZX84-C24,235, BZX84B24-7-F, DDZX24C-7, or MMBZ5252BLT1G.

Q: What is the significance of ±2% versus ±5% tolerance? A: Tolerance indicates the accuracy of the Zener voltage. ±2% tolerance (BZX84-B24,215, BZX84B24-7-F) provides tighter voltage regulation than ±5% tolerance. Use ±2% parts when precise voltage reference is critical. ±5% parts are acceptable for general voltage regulation and protection applications.

Q: Are all listed parts ROHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant and have MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard PCB assembly processes and storage conditions.

Q: What is the difference between SOT-23-3 and TO-236AB packaging? A: SOT-23-3 and TO-236AB are equivalent package designations for the same physical form factor. Both refer to a three-lead surface mount package with identical pin spacing and dimensions. Parts specified as either SOT-23-3 or TO-236AB are mechanically and electrically interchangeable on the PCB.

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