CMPZ5235B BK PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5235B BK PBFREE is a 6.8 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 (MSL 1).

Substitute parts are necessary when the original CMPZ5235B becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible alternatives from qualified manufacturers. The substitute parts listed maintain electrical equivalence within specified parameter tolerances while offering different availability, packaging options, or enhanced certifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	6.8	V
Tolerance	±5%	—
Power - Maximum	350	mW
Impedance (Maximum)	5	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 5 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 of the CMPZ5235B is determined by strict equivalence in the following critical parameters:

Primary Equivalence Criteria:

Voltage - Zener (Nominal): 6.8 V (exact match required)
Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, SOT-23-3 (physically compatible)
Operating Temperature Range: Minimum -65°C to maximum 150°C (or better)
RoHS3 Compliance: Required for regulatory compatibility

Secondary Compatibility Parameters:

Tolerance: ±5% or tighter (±1%, ±2%, ±6% are acceptable)
Power - Maximum: 350 mW or greater (250 mW or 300 mW substitutes operate within derated conditions)
Impedance (Maximum): 5 Ohms or lower (higher impedance values acceptable for most applications)
Current - Reverse Leakage: 3 µA @ 5 V or lower (2 µA @ 4 V is acceptable)
Voltage - Forward (Maximum): 900 mV @ 10 mA or lower

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching all primary and secondary parameters) and Compatible Alternatives (meeting primary criteria with acceptable parameter variations for standard applications).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Vf (mV)	Temp Range (°C)	Package	Status
CMPZ5235B BK PBFREE	Central Semiconductor Corp	6.8	±5%	350	5	3 @ 5V	900 @ 10mA	-65 to 150	SOT-23-3	Active
MMBZ5235B-7-F	Diodes Incorporated	6.8	±5%	350	5	3 @ 5V	900 @ 10mA	-65 to 150	SOT-23-3	Active
BZX84-A6V8,215	NXP Semiconductors	6.8	±1%	250	15	2 @ 4V	900 @ 10mA	-65 to 150	TO-236AB	Active
BZX84-B6V8,215	Nexperia USA Inc.	6.8	±2%	250	15	2 @ 4V	900 @ 10mA	-65 to 150	TO-236AB	Active
BZX84-C6V8,215	Nexperia USA Inc.	6.8	±5%	250	15	2 @ 4V	900 @ 10mA	-65 to 150	TO-236AB	Active
BZX84-C6V8,235	NXP Semiconductors	6.8	±5%	250	15	2 @ 4V	900 @ 10mA	-65 to 150	TO-236AB	Active
BZX84B6V8-E3-08	Vishay General Semiconductor	6.8	±2%	300	15	2 @ 4V	—	-55 to 150	SOT-23-3	Active
BZX84C6V8-7-F	Diodes Incorporated	6.8	±6%	300	15	2 @ 4V	900 @ 10mA	-65 to 150	SOT-23-3	Active
BZX84C6V8-E3-08	Vishay General Semiconductor	6.8	±5%	300	15	3 @ 4V	—	-55 to 150	SOT-23-3	Active
BZX84C6V8-G3-08	Vishay General Semiconductor	6.8	±5%	300	15	3 @ 4V	—	-55 to 150	SOT-23-3	Active
BZX84C6V8-HE3-08	Vishay General Semiconductor	6.8	±5%	300	15	3 @ 4V	—	-55 to 150	SOT-23-3	Obsolete

Engineering Selection Recommendations

Direct Electrical Equivalent (Preferred):

MMBZ5235B-7-F from Diodes Incorporated is the primary substitute for CMPZ5235B BK PBFREE. This part maintains identical electrical specifications across all critical parameters: 6.8 V nominal voltage, ±5% tolerance, 350 mW power rating, 5 Ohms maximum impedance, and -65°C to 150°C operating range. Both parts are Active in product status and RoHS3 compliant. The primary difference is packaging format (Tape & Reel versus Bulk), which affects manufacturing process compatibility rather than electrical performance.

Compatible Alternatives for Standard Applications:

The BZX84 series from Vishay General Semiconductor (BZX84C6V8-E3-08, BZX84C6V8-G3-08) and Diodes Incorporated (BZX84C6V8-7-F) provide compatible substitution with the following considerations:

These parts operate at 300 mW power rating versus the original 350 mW specification. Applications requiring the full 350 mW dissipation capacity should not use these alternatives.
Operating temperature minimum is -55°C instead of -65°C. Applications requiring operation below -55°C require the original part or MMBZ5235B-7-F.
All BZX84 alternatives maintain 6.8 V nominal voltage and are RoHS3 compliant.
BZX84C6V8-E3-08 from Vishay offers the highest inventory availability (518,200 pcs) among all substitutes.

NXP Semiconductors BZX84-A6V8, BZX84-B6V8, and BZX84-C6V8 Series:

These parts are rated at 250 mW power dissipation, representing a 28.6% reduction from the original 350 mW specification. These alternatives are suitable only for applications where power dissipation does not exceed 250 mW. All three variants are Active in product status, RoHS3 compliant, and carry AEC-Q101 automotive qualification. The BZX84-A6V8 offers ±1% tolerance (superior to the original ±5%), while BZX84-B6V8 and BZX84-C6V8 provide ±2% and ±5% tolerance respectively.

Obsolete Part Consideration:

BZX84C6V8-HE3-08 from Vishay is marked as Obsolete in product status. While this part meets all electrical specifications, its obsolete classification indicates discontinued manufacturing. This part should not be selected for new designs or long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5235B-7-F be used as a direct replacement for CMPZ5235B BK PBFREE?

A: Yes. MMBZ5235B-7-F is a direct electrical equivalent. Both parts specify 6.8 V nominal voltage, ±5% tolerance, 350 mW power rating, 5 Ohms maximum impedance, and -65°C to 150°C operating temperature. The only difference is packaging format (Tape & Reel versus Bulk). Verify that your manufacturing process accommodates the packaging format before substitution.

Q: What is the difference between the 350 mW CMPZ5235B and the 300 mW BZX84C6V8-E3-08?

A: The 50 mW difference represents the maximum continuous power dissipation rating. The BZX84C6V8-E3-08 is rated for 300 mW, while CMPZ5235B is rated for 350 mW. If your circuit dissipates more than 300 mW in the Zener diode, the BZX84C6V8-E3-08 will exceed its power rating and may fail. For applications dissipating 300 mW or less, the BZX84C6V8-E3-08 is acceptable.

Q: Are the NXP BZX84-A6V8, BZX84-B6V8, and BZX84-C6V8 suitable substitutes?

A: These parts are suitable only if your application dissipates 250 mW or less in the Zener diode. All three maintain the 6.8 V nominal voltage and -65°C to 150°C operating range. The primary limitation is the 250 mW power rating, which is 28.6% lower than the original 350 mW specification. Verify power dissipation in your circuit before selecting these alternatives.

Q: What does the operating temperature difference between -65°C and -55°C mean for substitution?

A: The CMPZ5235B and MMBZ5235B-7-F are rated for operation down to -65°C. The Vishay BZX84 series (BZX84B6V8-E3-08, BZX84C6V8-E3-08, BZX84C6V8-G3-08) are rated down to -55°C only. If your application requires operation below -55°C, you must use CMPZ5235B or MMBZ5235B-7-F. For applications with minimum operating temperature of -55°C or higher, the Vishay parts are acceptable.

Q: Why is BZX84C6V8-HE3-08 listed if it is obsolete?

A: BZX84C6V8-HE3-08 is included for reference purposes only, as it appears in the original substitute list. This part is marked as Obsolete in product status, indicating that the manufacturer has discontinued production. New designs should not specify this part. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed.

Q: What does ±5% tolerance mean for the 6.8 V Zener voltage?

A: ±5% tolerance on a 6.8 V Zener diode means the actual Zener voltage can range from 6.46 V to 7.14 V (6.8 V ± 0.34 V). All substitute parts listed maintain this tolerance or tighter (±1%, ±2%, ±6%). Tighter tolerances (±1%, ±2%) provide more precise voltage regulation. Looser tolerances (±6%) are acceptable if your circuit design accommodates the wider voltage range.

Q: Can I use BZX84C6V8-7-F with ±6% tolerance instead of ±5%?

A: Yes, if your circuit design accommodates the wider tolerance range. The ±6% tolerance on BZX84C6V8-7-F means the Zener voltage can range from 6.39 V to 7.21 V, compared to 6.46 V to 7.14 V for ±5% tolerance. If your application requires tighter voltage regulation, verify that the ±6% range is acceptable before substitution.

Q: What is the significance of the impedance (Zzt) parameter in substitution?

A: Impedance (Zzt) affects the dynamic voltage regulation characteristics of the Zener diode. The CMPZ5235B specifies 5 Ohms maximum impedance, while most substitute parts specify 15 Ohms maximum. Lower impedance provides better voltage regulation under varying load conditions. If your circuit requires precise voltage regulation with low impedance, CMPZ5235B or MMBZ5235B-7-F are preferred. For standard voltage regulation applications, 15 Ohms impedance is acceptable.

Q: Are all listed substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant, matching the compliance status of the original CMPZ5235B. This ensures compatibility with RoHS3 regulated applications and supply chains.

Q: What does AEC-Q101 qualification mean for the NXP and Vishay parts?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this qualification have undergone additional testing and reliability validation for automotive applications. The original CMPZ5235B does not specify AEC-Q101 qualification. If your application requires automotive-grade components, the NXP BZX84 series (BZX84-A6V8, BZX84-B6V8, BZX84-C6V8) and Vishay BZX84C6V8-HE3-08 provide this qualification.

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