CMPZ5245B BK PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5245B BK PBFREE is a 15 V Zener diode manufactured by Central Semiconductor Corp, rated for 350 mW power dissipation in a surface mount SOT-23 package. This component is classified as Active and RoHS3 compliant. Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit alternative manufacturers with equivalent electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	15	V
Tolerance	±5%	—
Power - Maximum	350	mW
Impedance (Maximum)	16	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 11 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
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 eligibility is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 15 V (nominal)
Package type: SOT-23-3 / TO-236-3 / SC-59 (physically and electrically compatible)
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance and MSL rating

Secondary Compatibility Factors:

Power rating: 350 mW (main part) to 250–300 mW (acceptable for lower-power applications)
Tolerance: ±5% (main part) to ±1%, ±2% (tighter tolerances acceptable)
Impedance: 16 Ohms (main part) to 30 Ohms (acceptable within zener diode specifications)
Reverse leakage current: 100 nA @ 11 V (main part) to 50 nA @ 10.5 V (acceptable)

Substitute parts are grouped into two categories: Direct Equivalents (matching 350 mW power rating) and Functional Equivalents (250–300 mW power rating, suitable for applications not requiring maximum power dissipation).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Temp Range (°C)	Package	Status
CMPZ5245B BK PBFREE	Central Semiconductor Corp	15	±5%	350	16	100 @ 11 V	-65 to 150	SOT-23-3	Active
MMBZ5245B-7-F	Diodes Incorporated	15	±5%	350	16	100 @ 11 V	-65 to 150	SOT-23-3	Active
BZX84-A15,215	Nexperia USA Inc.	15	±1%	250	30	50 @ 10.5 V	-65 to 150	TO-236AB	Active
BZX84-B15,215	Nexperia USA Inc.	15	±2%	250	30	50 @ 10.5 V	-65 to 150	TO-236AB	Active
BZX84-B15,235	Nexperia USA Inc.	15	±2%	250	30	50 @ 10.5 V	-65 to 150	TO-236AB	Active
BZX84-C15,215	Nexperia USA Inc.	15	±5%	250	30	50 @ 10.5 V	-65 to 150	TO-236AB	Active
BZX84-C15,235	Nexperia USA Inc.	15	±5%	250	30	50 @ 10.5 V	-65 to 150	TO-236AB	Active
BZX84B15-7-F	Diodes Incorporated	15	±2%	300	30	100 @ 10.5 V	-65 to 150	SOT-23-3	Active
BZX84B15-E3-08	Vishay General Semiconductor - Diodes Division	15	±2%	300	30	50 @ 10.5 V	-55 to 150	SOT-23-3	Active
BZX84B15-E3-18	Vishay General Semiconductor - Diodes Division	15	±2%	300	30	50 @ 10.5 V	-55 to 150	SOT-23-3	Active
BZX84B15-HE3-08	Vishay General Semiconductor - Diodes Division	15	±2%	300	30	50 @ 10.5 V	-55 to 150	SOT-23-3	Obsolete

Engineering Selection Recommendations

Direct Equivalent (Preferred for Drop-In Replacement):

MMBZ5245B-7-F (Diodes Incorporated) is the primary direct equivalent. It matches all electrical specifications of the CMPZ5245B BK PBFREE: 15 V nominal zener voltage, ±5% tolerance, 350 mW power rating, 16 Ohms impedance, and SOT-23-3 package. Both parts are Active status and RoHS3 compliant with MSL 1 rating. This part is suitable for applications requiring identical electrical performance without design modification.

Functional Equivalents (250–300 mW Power Rating):

The Nexperia BZX84 series (BZX84-A15,215; BZX84-B15,215; BZX84-B15,235; BZX84-C15,215; BZX84-C15,235) and Diodes Incorporated BZX84B15-7-F are functional equivalents with reduced power ratings (250–300 mW). These parts are suitable for applications where the circuit design does not require the full 350 mW dissipation capability. All Nexperia parts carry AEC-Q101 automotive qualification and are Active status. The BZX84-C15 series matches the ±5% tolerance of the main part.

Parts to Avoid:

BZX84B15-HE3-08 (Vishay) is marked Obsolete and should not be selected for new designs or long-term supply planning.

Temperature Range Consideration:

BZX84B15-E3-08, BZX84B15-E3-18, and BZX84B15-HE3-08 (Vishay) operate from -55°C to 150°C, which is narrower than the main part's -65°C to 150°C range. These parts are acceptable only if the application's minimum operating temperature does not fall below -55°C.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5245B-7-F replace CMPZ5245B BK PBFREE in all applications?

A: Yes. MMBZ5245B-7-F is a direct electrical and mechanical equivalent with identical zener voltage (15 V), tolerance (±5%), power rating (350 mW), impedance (16 Ohms), and package (SOT-23-3). Both are Active status and RoHS3 compliant. No circuit modification is required.

Q: Why do some substitute parts have lower power ratings (250–300 mW vs. 350 mW)?

A: Lower power ratings indicate reduced maximum power dissipation capability. These parts are suitable for circuits where the zener diode operates below 300 mW. If your application requires the full 350 mW dissipation, select MMBZ5245B-7-F or confirm that the circuit design operates within the lower power limit.

Q: Are Nexperia BZX84 parts with AEC-Q101 qualification suitable for non-automotive applications?

A: Yes. AEC-Q101 qualification indicates automotive-grade reliability and is acceptable for general industrial and consumer applications. The qualification does not restrict use to automotive circuits.

Q: What is the difference between BZX84-A15, BZX84-B15, and BZX84-C15?

A: These designations indicate tolerance grades: BZX84-A15 is ±1%, BZX84-B15 is ±2%, and BZX84-C15 is ±5%. All three have identical zener voltage (15 V), power rating (250 mW), and package. Select based on tolerance requirements: tighter tolerance (±1% or ±2%) for precision applications, or standard tolerance (±5%) for general-purpose circuits.

Q: Can I use BZX84B15-E3-08 if my circuit operates at -60°C?

A: No. BZX84B15-E3-08 operates from -55°C to 150°C. At -60°C, this part is outside its specified operating range. Use CMPZ5245B BK PBFREE or MMBZ5245B-7-F, which are rated to -65°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the main part's compliance status.

Q: What packaging formats are available for these substitute parts?

A: MMBZ5245B-7-F is supplied in Tape & Reel (TR). Nexperia BZX84 series parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel formats. Central Semiconductor CMPZ5245B is supplied in Bulk. Confirm packaging availability with your supplier based on assembly requirements.

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