CMPZ4101 BK Zener Diode 8.2V 350mW SOT-23 Equivalent & Substitute Parts

Part Overview

The CMPZ4101 BK is a surface mount Zener diode rated at 8.2 V nominal voltage with 350 mW maximum power dissipation in a SOT-23 package. Manufactured by Central Semiconductor Corp, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	8.2	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	200	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 6.3 V
Voltage - Forward (Max) @ If	1	V @ 200 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	—

Substitute Part Grouping Explanation

Substitution of the CMPZ4101 BK is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 8.2 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
RoHS compliance: ROHS3 Compliant
Operating temperature range: -65°C to 150°C or compatible subset

Secondary Compatibility Factors:

Power rating: 350 mW (main part) or 300 mW (acceptable for lower power applications)
Voltage tolerance: ±5% or tighter
Impedance and leakage characteristics: Must support circuit requirements

Substitute parts are grouped into two categories based on power rating alignment:

Category A - Full Power Rating Match (350 mW): Parts with 350 mW maximum power dissipation provide direct functional equivalence to the CMPZ4101 BK.

Category B - Reduced Power Rating (250-300 mW): Parts with 250 mW or 300 mW ratings are suitable for applications where the circuit design permits lower power dissipation, offering improved thermal performance and wider availability.

All substitute parts maintain the 8.2 V nominal Zener voltage, SOT-23-3 package, surface mount configuration, and ROHS3 compliance required for direct replacement.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Temp Range	Product Status	Packaging
CMPZ4101 BK	Central Semiconductor Corp	8.2 V	±5%	350 mW	200 Ω	-65 to 150°C	Obsolete	SOT-23
BZX84B8V2-E3-08	Vishay General Semiconductor	8.2 V	±2%	300 mW	15 Ω	-55 to 150°C	Active	SOT-23-3
BZX84C8V2-7-F	Diodes Incorporated	8.2 V	±6%	300 mW	15 Ω	-65 to 150°C	Active	SOT-23-3
BZX84C8V2-E3-18	Vishay General Semiconductor	8.2 V	±5%	300 mW	15 Ω	-55 to 150°C	Active	SOT-23-3
BZX84C8V2-G3-08	Vishay General Semiconductor	8.2 V	±5%	300 mW	15 Ω	-55 to 150°C	Active	SOT-23-3
BZX84C8V2LT1G	onsemi	8.2 V	±5%	250 mW	15 Ω	-65 to 150°C	Active	SOT-23-3
CZRT5237B-G	Comchip Technology	8.2 V	±5%	300 mW	8 Ω	-65 to 150°C	Active	SOT-23-3
CZRT55C8V2-G	Comchip Technology	8.2 V	±6%	350 mW	15 Ω	-65 to 150°C	Active	SOT-23-3
DDZX8V2C-7	Diodes Incorporated	8.2 V	±2.55%	300 mW	8 Ω	-65 to 150°C	Active	SOT-23-3
MMBZ4694-E3-08	Vishay General Semiconductor	8.2 V	±5%	350 mW	—	-55 to 150°C	Obsolete	SOT-23-3
MMBZ5237B-7-F	Diodes Incorporated	8.2 V	±5%	350 mW	8 Ω	-65 to 150°C	Active	SOT-23-3

Engineering Selection Recommendations

For Direct Replacement with Full Power Rating (350 mW):

Select CZRT55C8V2-G (Comchip Technology) or MMBZ5237B-7-F (Diodes Incorporated) when the circuit design requires the full 350 mW power dissipation capability of the original CMPZ4101 BK. Both parts are active products with ROHS3 compliance, extended operating temperature range (-65°C to 150°C), and SOT-23-3 packaging. MMBZ5237B-7-F offers superior impedance characteristics (8 Ω) and is available in high inventory quantities (23,400 pcs).

For Applications Permitting Reduced Power Rating (300 mW):

Select BZX84C8V2-7-F (Diodes Incorporated) for maximum inventory availability (62,400 pcs) and extended temperature range matching the original part (-65°C to 150°C). Alternatively, select DDZX8V2C-7 (Diodes Incorporated) for superior voltage tolerance (±2.55%) and low impedance (8 Ω), or CZRT5237B-G (Comchip Technology) for comparable performance with extended temperature range.

For Applications Permitting Reduced Power Rating (250 mW):

Select BZX84C8V2LT1G (onsemi) when thermal constraints or circuit design permits 250 mW operation. This part offers the highest inventory availability (596,300 pcs), extended temperature range (-65°C to 150°C), and active product status.

Compliance and Availability Considerations:

All recommended substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited). Selection should prioritize active product status and inventory availability for supply chain continuity. The CMPZ4101 BK is obsolete; therefore, transition to an active substitute part is required for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can I use a 300 mW Zener diode as a direct replacement for the 350 mW CMPZ4101 BK?

A: Yes, if your circuit design permits operation at the lower power rating. The 300 mW parts (BZX84C8V2-7-F, BZX84C8V2-E3-18, BZX84C8V2-G3-08, CZRT5237B-G, DDZX8V2C-7) maintain the 8.2 V nominal voltage and SOT-23-3 package. Verify that your application does not require the full 350 mW dissipation capability. If maximum power dissipation is a design requirement, select CZRT55C8V2-G or MMBZ5237B-7-F.

Q: What is the difference between the various Vishay BZX84 part numbers (BZX84B8V2-E3-08, BZX84C8V2-E3-18, BZX84C8V2-G3-08)?

A: These parts differ in packaging format and tolerance specifications. BZX84B8V2-E3-08 offers ±2% tolerance with 300 mW rating. BZX84C8V2-E3-18 and BZX84C8V2-G3-08 both provide ±5% tolerance with 300 mW rating. The suffix designates packaging format (E3-08 = Cut Tape, E3-18 and G3-08 = Tape & Reel). All three are functionally equivalent for 8.2 V Zener applications.

Q: Why does the CMPZ4101 BK have a 200 Ω impedance specification while substitute parts show 8-15 Ω?

A: The impedance specification reflects the dynamic impedance of the Zener diode at the rated current. Lower impedance values in substitute parts indicate improved voltage regulation characteristics and lower noise performance. This is a beneficial improvement over the original part and does not prevent substitution.

Q: Is the onsemi BZX84C8V2LT1G suitable for my application if I need 350 mW?

A: No. The BZX84C8V2LT1G is rated for 250 mW maximum power dissipation. If your circuit requires 350 mW capability, select CZRT55C8V2-G or MMBZ5237B-7-F instead.

Q: Can I substitute parts with different operating temperature ranges?

A: Yes, provided the substitute part's temperature range encompasses your application requirements. The CMPZ4101 BK operates from -65°C to 150°C. Substitute parts with -55°C to 150°C range (BZX84B8V2-E3-08, BZX84C8V2-E3-18, BZX84C8V2-G3-08, MMBZ4694-E3-08) are suitable for applications not requiring operation below -55°C. For full temperature range compatibility, select parts rated -65°C to 150°C.

Q: What is the significance of the different tolerance ratings (±2%, ±2.55%, ±5%, ±6%)?

A: Tolerance specifies the allowable deviation of the Zener voltage from the nominal 8.2 V value. Tighter tolerances (±2%, ±2.55%) provide more precise voltage regulation. For applications requiring strict voltage control, select DDZX8V2C-7 (±2.55%) or BZX84B8V2-E3-08 (±2%). For general applications, ±5% or ±6% tolerance is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the original CMPZ4101 BK.

Q: Which substitute part has the best inventory availability?

A: BZX84C8V2-7-F (Diodes Incorporated) offers the highest inventory availability at 62,400 pcs, followed by BZX84C8V2LT1G (onsemi) at 596,300 pcs. For 350 mW applications, MMBZ5237B-7-F provides 23,400 pcs in stock.

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