CMPZ5232B BK PBFREE Zener Diode 5.6V 350mW SOT-23 Equivalent & Substitute Parts

Part Overview

The CMPZ5232B BK PBFREE is a surface mount zener diode manufactured by Central Semiconductor Corp, rated at 5.6V nominal zener voltage with 350mW maximum power dissipation in a SOT-23 package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the SOT-23/TO-236-3 package family. Substitutes are necessary when the primary part experiences supply constraints, lead time issues, or when alternative manufacturers' components meet identical or superior performance criteria.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.6	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	11	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 3V
Voltage - Forward (Vf) (Max) @ 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	-
MSL Rating	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the CMPZ5232B BK PBFREE are classified into two categories based on electrical and mechanical compatibility:

Category 1: Direct Electrical Equivalents (350mW Power Rating) These parts maintain identical zener voltage (5.6V), tolerance (±5%), power rating (350mW), impedance (11 Ohms), and reverse leakage specifications. They are pin-compatible within the SOT-23-3 package and require no circuit redesign.

Category 2: Functional Equivalents with Reduced Power Rating (250-300mW) These parts maintain the 5.6V zener voltage and SOT-23-3 package compatibility but operate at reduced maximum power dissipation (250mW or 300mW). Substitution is valid only when circuit design permits lower power handling. These parts feature improved impedance characteristics (40 Ohms maximum) and lower reverse leakage (1µA @ 2V), with automotive-grade qualification (AEC-Q101) available from Nexperia.

Key Parameters Determining Substitutability:

Zener voltage: 5.6V (mandatory match)
Package: SOT-23-3 / TO-236-3 (mandatory match)
Operating temperature range: -65°C to 150°C minimum (or -55°C acceptable)
RoHS3 compliance (mandatory)
MSL rating: 1 (Unlimited)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power Max (mW)	Zzt Max (Ohms)	Reverse Leakage @ Vr	Vf Max @ If	Temp Range (°C)	Package	RoHS
CMPZ5232B BK PBFREE	Central Semiconductor Corp	5.6	±5%	350	11	5 µA @ 3V	900 mV @ 10mA	-65 to 150	SOT-23-3	ROHS3
MMBZ5232B-7-F	Diodes Incorporated	5.6	±5%	350	11	5 µA @ 3V	900 mV @ 10mA	-65 to 150	SOT-23-3	ROHS3
BZX84-A5V6,215	Nexperia USA Inc.	5.6	±1%	250	40	1 µA @ 2V	900 mV @ 10mA	-65 to 150	TO-236AB	ROHS3
BZX84-B5V6,215	Nexperia USA Inc.	5.6	±2%	250	40	1 µA @ 2V	900 mV @ 10mA	-65 to 150	TO-236AB	ROHS3
BZX84-B5V6,235	Nexperia USA Inc.	5.6	±2%	250	40	1 µA @ 2V	900 mV @ 10mA	-65 to 150	TO-236AB	ROHS3
BZX84-C5V6,215	Nexperia USA Inc.	5.6	±5%	250	40	1 µA @ 2V	900 mV @ 10mA	-65 to 150	TO-236AB	ROHS3
BZX84-C5V6,235	Nexperia USA Inc.	5.6	±5%	250	40	1 µA @ 2V	900 mV @ 10mA	-65 to 150	TO-236AB	ROHS3
BZX84B5V6-7-F	Diodes Incorporated	5.6	±2%	300	40	1 µA @ 2V	900 mV @ 10mA	-65 to 150	SOT-23-3	ROHS3
BZX84B5V6-E3-08	Vishay General Semiconductor	5.6	±2%	300	40	1 µA @ 2V	900 mV @ 10mA	-55 to 150	SOT-23-3	ROHS3
BZX84B5V6-E3-18	Vishay General Semiconductor	5.6	±2%	300	40	1 µA @ 2V	900 mV @ 10mA	-55 to 150	SOT-23-3	ROHS3
BZX84B5V6-G3-08	Vishay General Semiconductor	5.6	±2%	300	40	1 µA @ 2V	900 mV @ 10mA	-55 to 150	SOT-23-3	ROHS3

Engineering Selection Recommendations

Direct Replacement (No Circuit Modification Required): The MMBZ5232B-7-F from Diodes Incorporated is a direct electrical and mechanical equivalent to the CMPZ5232B BK PBFREE. Both parts share identical zener voltage (5.6V), tolerance (±5%), power rating (350mW), impedance (11 Ohms), and SOT-23-3 package specifications. Both are Active product status and ROHS3 compliant with MSL rating 1 (Unlimited). This substitute requires no design changes and provides pin-for-pin compatibility.

Functional Substitutes with Power Derating: The Nexperia BZX84 series (BZX84-A5V6, BZX84-B5V6, BZX84-C5V6 variants) and Diodes Incorporated BZX84B5V6-7-F are functional substitutes when circuit design permits operation at reduced power dissipation (250-300mW versus 350mW). These parts offer improved impedance characteristics (40 Ohms maximum) and lower reverse leakage (1µA @ 2V), with automotive-grade AEC-Q101 qualification available from Nexperia. Substitution is valid only when the application's power budget does not exceed the substitute part's maximum rating.

Automotive Applications: For automotive-qualified designs, the Nexperia BZX84-A5V6,215, BZX84-B5V6,215, BZX84-B5V6,235, BZX84-C5V6,215, and BZX84-C5V6,235 variants carry AEC-Q101 qualification. These parts are suitable for automotive-grade applications requiring certified component traceability.

Temperature Range Consideration: Vishay BZX84B5V6 variants (E3-08, E3-18, G3-08) operate over -55°C to 150°C, which is narrower than the CMPZ5232B's -65°C to 150°C range. Substitution with Vishay parts is valid only when the application's minimum operating temperature does not fall below -55°C.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5232B-7-F replace CMPZ5232B BK PBFREE without any circuit modifications? A: Yes. The MMBZ5232B-7-F is a direct equivalent with identical electrical specifications (5.6V, ±5%, 350mW, 11 Ohms impedance) and SOT-23-3 package. No circuit redesign is required.

Q: What is the difference between the 350mW CMPZ5232B and the 250-300mW Nexperia/Diodes substitutes? A: The primary difference is maximum power dissipation. The CMPZ5232B handles 350mW, while Nexperia BZX84 series handles 250mW and Diodes BZX84B5V6-7-F handles 300mW. Substitution is valid only when the circuit's power dissipation does not exceed the substitute part's rating. The Nexperia and Diodes alternatives offer lower impedance (40 Ohms) and lower reverse leakage (1µA @ 2V).

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant with MSL rating 1 (Unlimited), matching the CMPZ5232B BK PBFREE compliance status.

Q: Can I use Vishay BZX84B5V6-E3-08 in applications requiring -65°C operation? A: No. The Vishay BZX84B5V6-E3-08 operates from -55°C to 150°C. For applications requiring -65°C minimum operation, use the CMPZ5232B, MMBZ5232B-7-F, or Nexperia BZX84 series, which all support -65°C to 150°C.

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

Q: Which substitute offers the best tolerance specification? A: The Nexperia BZX84-A5V6,215 offers ±1% tolerance, superior to the CMPZ5232B's ±5% tolerance. However, this tighter tolerance comes with reduced power rating (250mW). For applications requiring both tight tolerance and 350mW power handling, the CMPZ5232B or MMBZ5232B-7-F are the appropriate choices.

Q: Are automotive-qualified versions available? A: Yes. Nexperia BZX84-A5V6,215, BZX84-B5V6,215, BZX84-B5V6,235, BZX84-C5V6,215, and BZX84-C5V6,235 carry AEC-Q101 automotive qualification. These are suitable for automotive applications requiring certified component qualification.

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