CMPZ5225B BK PBFREE Zener Diode Equivalent & Substitute Parts

Part Overview

The CMPZ5225B BK PBFREE is a 3 V, 350 mW surface mount zener diode manufactured by Central Semiconductor Corp in SOT-23 packaging. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The part is designed for voltage regulation and protection applications requiring a nominal zener voltage of 3 V with ±5% tolerance.

Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit selection from alternative manufacturers offering compatible electrical and mechanical specifications within the same package family.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	3	V
Power - Maximum	350	mW
Tolerance	±5%	—
Impedance (Maximum)	29	Ohms
Current - Reverse Leakage @ 1 V	50	µA
Voltage - Forward (Maximum) @ 10 mA	900	mV
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	—

Substitute Part Grouping Explanation

Substitution of the CMPZ5225B BK PBFREE is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

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

Allowable Variation Parameters:

Power - Maximum: 250 mW to 350 mW (equal or greater than 250 mW acceptable)
Tolerance: ±1% to ±7% (tighter or equal tolerance acceptable)
Impedance (Maximum): 29 Ohms to 95 Ohms (equal or greater acceptable)
Current - Reverse Leakage @ 1 V: 10 µA to 50 µA (equal or lower acceptable)

Substitute parts are grouped by power rating and tolerance class. Parts with 250 mW maximum power rating represent a reduction from the original 350 mW specification and are suitable only when circuit design permits lower power dissipation. Parts with 300 mW maximum power rating provide intermediate capability between the original and reduced-power alternatives.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Power Max (mW)	Tolerance	Zzt Max (Ω)	Ir @ 1V (µA)	Temp Range (°C)	Package	Status
CMPZ5225B BK PBFREE	Central Semiconductor Corp	3	350	±5%	29	50	-65 to 150	SOT-23	Active
BZX84-A3V0,215	NXP USA Inc.	3	250	±1%	95	10	-65 to 150	SOT-23-3	Active
BZX84-B3V0,215	Nexperia USA Inc.	3	250	±2%	95	10	-65 to 150	TO-236AB	Active
BZX84-B3V0,235	Nexperia USA Inc.	3	250	±2%	95	10	-65 to 150	TO-236AB	Active
BZX84-C3V0,215	NXP Semiconductors	3	250	±5%	95	10	-65 to 150	TO-236AB	Active
BZX84-C3V0,235	Nexperia USA Inc.	3	250	±5%	95	10	-65 to 150	TO-236AB	Active
BZX84B3V0-E3-08	Vishay General Semiconductor	3	300	±2%	95	10	-55 to 150	SOT-23-3	Active
BZX84B3V0-HE3-08	Vishay General Semiconductor	3	300	±2%	95	10	-55 to 150	SOT-23-3	Obsolete
BZX84C3V0-7-F	Diodes Incorporated	3	300	±7%	95	10	-65 to 150	SOT-23-3	Active
BZX84C3V0-E3-08	Vishay General Semiconductor	3	300	±5%	95	10	-55 to 150	SOT-23-3	Active
BZX84C3V0-G3-08	Vishay General Semiconductor	3	300	±5%	95	10	-55 to 150	SOT-23-3	Active

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Preferred):

BZX84C3V0-E3-08 and BZX84C3V0-G3-08 from Vishay General Semiconductor are the primary substitutes. Both parts maintain the 3 V nominal zener voltage, operate across -55°C to 150°C (encompassing the original -65°C lower limit with reduced cold-temperature capability), and provide 300 mW maximum power dissipation. These parts are Active status with RoHS3 compliance and SOT-23-3 packaging compatible with the original TO-236-3 / SC-59 footprint. The ±5% tolerance matches the original specification.

BZX84C3V0-7-F from Diodes Incorporated offers 300 mW power rating with ±7% tolerance and full -65°C to 150°C operating range, providing superior low-temperature performance. Active status and RoHS3 compliance confirmed.

Tier 2 - Reduced Power Substitutes (Conditional):

BZX84-A3V0,215, BZX84-B3V0,215, BZX84-B3V0,235, BZX84-C3V0,215, and BZX84-C3V0,235 from NXP and Nexperia provide 250 mW maximum power dissipation. These parts are suitable only when circuit design analysis confirms that power dissipation does not exceed 250 mW under worst-case operating conditions. All maintain 3 V nominal zener voltage, -65°C to 150°C operating range (except BZX84-A3V0,215 which specifies -65°C to 150°C), and RoHS3 compliance. Tolerance ranges from ±1% to ±5%.

Obsolete Parts:

BZX84B3V0-HE3-08 is marked Obsolete and should not be selected for new designs despite technical compatibility.

Frequently Asked Questions (FAQ)

Q: Can BZX84-C3V0,215 replace CMPZ5225B BK PBFREE in all applications?

A: BZX84-C3V0,215 is electrically compatible for 3 V zener voltage regulation. However, the maximum power rating is 250 mW compared to the original 350 mW. Substitution is valid only if circuit analysis confirms power dissipation remains below 250 mW under all operating conditions including worst-case temperature and load scenarios.

Q: What is the difference between BZX84C3V0-E3-08 and BZX84C3V0-G3-08?

A: Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications: 3 V nominal zener voltage, 300 mW maximum power, ±5% tolerance, and SOT-23-3 packaging. The suffix designations (-E3-08 and -G3-08) indicate different manufacturing process or date code series. Both are Active status and suitable substitutes.

Q: Why does BZX84C3V0-7-F have ±7% tolerance while the original has ±5%?

A: Tolerance specification reflects the manufacturing process capability of Diodes Incorporated. The ±7% tolerance is wider than the original ±5%, meaning the actual zener voltage may deviate further from the nominal 3 V value. This is acceptable in applications where the circuit design accommodates the wider voltage tolerance band. The part remains suitable for voltage regulation and protection functions where exact voltage precision is not critical.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant. The original CMPZ5225B BK PBFREE is also RoHS3 compliant. Compliance status is consistent across all alternatives.

Q: What is the significance of the operating temperature range difference between -65°C to 150°C and -55°C to 150°C?

A: The original CMPZ5225B BK PBFREE operates from -65°C to 150°C. Substitute parts from Vishay (BZX84B3V0-E3-08, BZX84C3V0-E3-08, BZX84C3V0-G3-08) specify -55°C to 150°C, representing a 10°C reduction in minimum operating temperature. Substitution is valid only if the application does not require operation below -55°C. Applications limited to -55°C minimum temperature or higher can use these parts without restriction.

Q: Can I use BZX84B3V0-HE3-08 as a substitute?

A: BZX84B3V0-HE3-08 is marked Obsolete product status. Although electrical specifications are compatible, obsolete parts should not be selected for new designs due to uncertain future availability and potential manufacturing discontinuation.

Q: What packaging compatibility exists between SOT-23 and SOT-23-3?

A: SOT-23 and SOT-23-3 refer to the same physical package outline (TO-236-3, SC-59). The designations are equivalent. All substitute parts using SOT-23-3 designation are mechanically and electrically compatible with the original SOT-23 footprint.

Q: How do I determine if a 250 mW substitute is suitable for my application?

A: Calculate the maximum power dissipation using P = Vz × Iz, where Vz is the zener voltage (3 V) and Iz is the maximum zener current under worst-case conditions. If this calculated power remains below 250 mW, the substitute is suitable. If power dissipation approaches or exceeds 250 mW, select a 300 mW or 350 mW rated part.

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