CMPZ5245B TR PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5245B TR PBFREE is a 15 V Zener diode manufactured by Central Semiconductor Corp, rated for 350 mW power dissipation with ±5% voltage tolerance. This surface mount component in SOT-23 packaging is designed for voltage regulation and protection applications in electronic circuits. The part is currently Active in product status with RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching core electrical parameters: nominal Zener voltage of 15 V, surface mount SOT-23/TO-236-3 package compatibility, and operating temperature range of -65°C to 150°C. Substitutes may vary in power rating, voltage tolerance, and impedance within acceptable engineering limits for this component category.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	16	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 11 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
RoHS Status	ROHS3 Compliant	-
MSL	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution eligibility for the CMPZ5245B TR PBFREE is determined by the following criteria:

Primary Matching Parameters:

Nominal Zener voltage: 15 V (exact match required)
Package type: SOT-23-3 / TO-236-3 / SC-59 (pin-compatible surface mount packages)
Operating temperature range: minimum -55°C to -65°C; maximum 150°C
Mounting type: Surface Mount

Secondary Compatibility Parameters:

Power rating: 250 mW to 350 mW (acceptable range for circuit design margin)
Voltage tolerance: ±1% to ±5% (tighter tolerance acceptable; looser tolerance acceptable within circuit requirements)
Impedance (Max): 16 to 30 Ohms (acceptable variation for regulation characteristics)
Forward voltage: 900 mV @ 10 mA (standard across all candidates)
Reverse leakage: 50 nA to 100 nA (acceptable variation)

Compliance Requirements:

RoHS3 Compliant (mandatory)
MSL 1 (Unlimited) preferred; MSL 1 acceptable
REACH Unaffected status (all candidates meet this)

Substitute parts are grouped by manufacturer and tolerance class. Parts with identical electrical specifications but different packaging formats (Tape & Reel vs. Cut Tape) are considered direct substitutes.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Product Status
CMPZ5245B TR PBFREE	Central Semiconductor Corp	15 V	±5%	350 mW	16 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23	Active
BZX84-A15,215	Nexperia USA Inc.	15 V	±1%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	Active
BZX84-B15,215	Nexperia USA Inc.	15 V	±2%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	Active
BZX84-B15,235	Nexperia USA Inc.	15 V	±2%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	Active
BZX84-C15,215	Nexperia USA Inc.	15 V	±5%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	Active
BZX84-C15,235	Nexperia USA Inc.	15 V	±5%	250 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	TO-236AB	Active
BZX84B15-7-F	Diodes Incorporated	15 V	±2%	300 mW	30 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active
BZX84B15-E3-08	Vishay General Semiconductor - Diodes Division	15 V	±2%	300 mW	30 Ω	-	-55 to 150°C	SOT-23-3	Active
BZX84B15-E3-18	Vishay General Semiconductor - Diodes Division	15 V	±2%	300 mW	30 Ω	-	-55 to 150°C	SOT-23-3	Active
BZX84B15-HE3-08	Vishay General Semiconductor - Diodes Division	15 V	±2%	300 mW	30 Ω	-	-55 to 150°C	SOT-23-3	Obsolete
BZX84B15-TP	Micro Commercial Co	15 V	±2%	350 mW	30 Ω	900 mV @ 10 mA	-55 to 150°C	SOT-23	Active

Engineering Selection Recommendations

Preferred Substitutes (Active Status, Full Compliance):

The following parts are recommended as direct substitutes based on Active product status, RoHS3 compliance, and matching electrical specifications:

BZX84B15-TP (Micro Commercial Co): Matches the CMPZ5245B TR PBFREE in power rating (350 mW), tolerance (±2%), and SOT-23 package. Operating temperature range is -55°C to 150°C, which covers the primary operating window. This part provides equivalent performance with tighter voltage tolerance.

BZX84B15-7-F (Diodes Incorporated): Rated at 300 mW with ±2% tolerance in SOT-23-3 package. Suitable for applications where 300 mW power dissipation is acceptable. Operating temperature range -65°C to 150°C matches the original specification.

BZX84-C15,235 (Nexperia USA Inc.): Provides ±5% tolerance matching the original part, with 250 mW power rating. Automotive-grade with AEC-Q101 qualification. Operating temperature -65°C to 150°C. Suitable for cost-optimized designs where lower power dissipation is acceptable.

BZX84-B15,215 and BZX84-B15,235 (Nexperia USA Inc.): Both rated 250 mW with ±2% tolerance. Automotive-grade with AEC-Q101 qualification. Suitable for applications requiring tighter voltage tolerance than ±5%.

BZX84-A15,215 (Nexperia USA Inc.): Provides tightest tolerance (±1%) with 250 mW rating. Automotive-grade with AEC-Q101 qualification. Recommended for precision voltage regulation applications.

Not Recommended:

BZX84B15-HE3-08 (Vishay): Product status is Obsolete. While electrically compatible, obsolete parts present supply chain risk and should be avoided for new designs.

BZX84B15-E3-08 and BZX84B15-E3-18 (Vishay): Operating temperature range limited to -55°C to 150°C, which does not cover the full -65°C lower limit of the original specification. Use only if application does not require operation below -55°C.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower power rating (250 mW vs. 350 mW)?

A: Yes, if circuit design analysis confirms that maximum power dissipation does not exceed 250 mW under worst-case conditions. Lower power rating provides less thermal margin but is electrically compatible. Verify thermal performance in your specific application.

Q: What is the difference between SOT-23 and TO-236AB packages?

A: SOT-23 and TO-236-3/TO-236AB are pin-compatible surface mount packages with identical pinout and footprint. These designations refer to the same physical package from different manufacturers or standards. Parts specified in either package are mechanically and electrically interchangeable on the PCB.

Q: Can I substitute a part with ±1% tolerance for one with ±5% tolerance?

A: Yes. Tighter tolerance (±1%) is a superior specification and is a direct substitute. The part will maintain voltage regulation within a narrower band, which is acceptable for any application designed for ±5% tolerance. Conversely, substituting ±5% for ±1% is not recommended without circuit re-analysis.

Q: Why do some substitute parts have different impedance values (16 Ω vs. 30 Ω)?

A: Impedance (Zzt) affects the dynamic regulation characteristics of the Zener diode. Higher impedance (30 Ω) results in slightly greater voltage variation with load current changes. For most applications, this difference is negligible. Verify impedance impact only if the circuit requires precise dynamic regulation performance.

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

A: Yes. Automotive-grade parts with AEC-Q101 qualification meet or exceed commercial-grade specifications. These parts are fully compatible with non-automotive applications and provide additional reliability margin.

Q: What does "Obsolete" product status mean for BZX84B15-HE3-08?

A: Obsolete status indicates the manufacturer has discontinued production. While existing inventory may be available, obsolete parts present supply chain risk for long-term production. Use only if no Active alternatives are available, and plan migration to an Active substitute.

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

A: No. The BZX84B15-E3-08 operating temperature range is -55°C to 150°C, which does not include -60°C. Use BZX84B15-7-F, BZX84B15-TP, or Nexperia BZX84 series parts with -65°C lower limit instead.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are RoHS3 compliant and REACH unaffected, matching the compliance status of the CMPZ5245B TR PBFREE.

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