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

Part Overview

The CMPZ4101 TR is a surface mount Zener diode rated at 8.2 V nominal voltage with 350 mW maximum power dissipation in SOT-23 packaging. Manufactured by Central Semiconductor Corp, this component is classified as obsolete. Due to its obsolete status and limited availability, identifying equivalent and substitute parts is necessary for design continuity and procurement reliability. Substitute parts must maintain the same nominal Zener voltage (8.2 V), compatible package format (SOT-23-3), and surface mount mounting type while meeting or exceeding the electrical performance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	8.2	V
Tolerance	±5%	—
Power - Maximum	350	mW
Impedance (Maximum)	200	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 6.3 V
Voltage - Forward (Maximum) @ If	1	V @ 200 mA
Operating Temperature Range	-65 to 150	°C (TJ)
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 CMPZ4101 TR is determined by the following critical parameters:

Primary Substitution Criteria:

Nominal Zener voltage: 8.2 V (exact match required)
Package format: SOT-23-3 / TO-236-3 (physical and electrical compatibility)
Mounting type: Surface Mount (assembly process compatibility)
Maximum power rating: 350 mW or greater (thermal capability)
Operating temperature range: Must encompass or match -65°C to 150°C

Secondary Compatibility Factors:

Voltage tolerance: ±5% or tighter acceptable
Impedance characteristics: Lower impedance values indicate improved performance
Reverse leakage current: Lower values indicate superior performance
RoHS3 compliance: Required for modern supply chains
Moisture sensitivity: MSL 1 (Unlimited) preferred for storage and handling

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

Category A (350 mW Power Rating - Direct Replacement): Parts with 350 mW maximum power dissipation provide equivalent thermal performance to the original CMPZ4101 TR.

Category B (250-300 mW Power Rating - Functional Equivalent): Parts with reduced power ratings (250-300 mW) are functionally equivalent for applications where thermal dissipation does not approach the 350 mW limit. These parts maintain the same voltage regulation characteristics and package compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nominal)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Temp Range	Status
CMPZ4101 TR	Central Semiconductor Corp	8.2 V	±5%	350 mW	200 Ω	1 µA @ 6.3 V	-65 to 150°C	Obsolete
BZX84B8V2-E3-08	Vishay General Semiconductor	8.2 V	±2%	300 mW	15 Ω	700 nA @ 5 V	-55 to 150°C	Active
BZX84C8V2-7-F	Diodes Incorporated	8.2 V	±6%	300 mW	15 Ω	700 nA @ 5 V	-65 to 150°C	Active
BZX84C8V2-E3-18	Vishay General Semiconductor	8.2 V	±5%	300 mW	15 Ω	700 nA @ 5 V	-55 to 150°C	Active
BZX84C8V2-G3-08	Vishay General Semiconductor	8.2 V	±5%	300 mW	15 Ω	700 nA @ 5 V	-55 to 150°C	Active
BZX84C8V2LT1G	onsemi	8.2 V	±5%	250 mW	15 Ω	700 nA @ 5 V	-65 to 150°C	Active
CZRT5237B-G	Comchip Technology	8.2 V	±5%	300 mW	8 Ω	3 µA @ 6.5 V	-65 to 150°C	Active
CZRT55C8V2-G	Comchip Technology	8.2 V	±6%	350 mW	15 Ω	700 nA @ 5 V	-65 to 150°C	Active
DDZX8V2C-7	Diodes Incorporated	8.2 V	±2.55%	300 mW	8 Ω	100 nA @ 6.5 V	-65 to 150°C	Active
MMBZ4694-E3-08	Vishay General Semiconductor	8.2 V	±5%	350 mW	—	10 µA @ 6.2 V	-55 to 150°C	Obsolete
MMBZ5237B-7-F	Diodes Incorporated	8.2 V	±5%	350 mW	8 Ω	3 µA @ 6.5 V	-65 to 150°C	Active

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement (350 mW Equivalent):

MMBZ5237B-7-F (Diodes Incorporated) is the preferred substitute for CMPZ4101 TR. This part maintains the 350 mW power rating, 8.2 V nominal voltage, and ±5% tolerance matching the original specification. The component is in active production status, ensuring long-term availability. Operating temperature range of -65°C to 150°C encompasses the original specification. RoHS3 compliance and MSL 1 rating confirm suitability for modern manufacturing environments. The 8 Ohm impedance provides superior performance compared to the original 200 Ohm specification.

Alternative for 350 mW Requirement:

CZRT55C8V2-G (Comchip Technology) provides 350 mW power rating with active product status. This part is suitable where Comchip sourcing is preferred or where supply chain diversification is required. Operating temperature range extends to -65°C to 150°C. Voltage tolerance of ±6% is acceptable for most applications requiring ±5% or looser tolerance.

Functional Equivalents for Power-Limited Applications (300 mW):

BZX84C8V2-7-F (Diodes Incorporated) offers the highest inventory availability (62,400 pcs) among active substitutes. This part maintains 8.2 V voltage and ±6% tolerance with 300 mW power rating. Operating temperature range of -65°C to 150°C matches the original. Use this part when application thermal requirements do not approach 350 mW dissipation.

BZX84C8V2-E3-18 (Vishay General Semiconductor) provides ±5% tolerance matching the original specification with 300 mW power rating. This part is suitable where tighter voltage tolerance is required.

DDZX8V2C-7 (Diodes Incorporated) offers the tightest voltage tolerance (±2.55%) and lowest reverse leakage current (100 nA @ 6.5 V) among 300 mW options. This part is specified for applications requiring superior voltage regulation characteristics.

Reduced Power Option (250 mW):

BZX84C8V2LT1G (onsemi) provides the largest inventory availability (596,300 pcs) with 250 mW power rating. This part is suitable only for applications where maximum power dissipation remains below 250 mW. Operating temperature range of -65°C to 150°C matches the original specification.

Obsolete Parts to Avoid:

MMBZ4694-E3-08 (Vishay General Semiconductor) is classified as obsolete and should not be selected for new designs despite matching the 350 mW power rating.

Frequently Asked Questions (FAQ)

Q: Can BZX84C8V2-7-F (300 mW) replace CMPZ4101 TR (350 mW) in all applications?

A: BZX84C8V2-7-F is functionally equivalent for applications where the circuit does not require the full 350 mW thermal capability. If the design operates near or exceeds 300 mW dissipation, select MMBZ5237B-7-F or CZRT55C8V2-G to maintain the 350 mW rating. Verify actual power dissipation in your circuit before substitution.

Q: What is the difference between ±2%, ±5%, and ±6% voltage tolerance?

A: Voltage tolerance specifies the acceptable deviation from the nominal 8.2 V Zener voltage. ±2% tolerance (±0.164 V) provides the tightest regulation, suitable for precision applications. ±5% tolerance (±0.41 V) is standard for general-purpose applications. ±6% tolerance (±0.492 V) is acceptable where voltage regulation requirements are less stringent. Select based on your circuit's voltage regulation requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed are RoHS3 compliant. The original CMPZ4101 TR is also RoHS3 compliant. This compliance is mandatory for modern supply chains and ensures lead-free construction.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity limitations. These parts do not require special moisture-controlled storage or handling procedures. All listed parts carry MSL 1 rating, ensuring compatibility with standard warehouse and assembly processes.

Q: Can I use DDZX8V2C-7 instead of MMBZ5237B-7-F?

A: DDZX8V2C-7 has 300 mW power rating versus MMBZ5237B-7-F's 350 mW rating. Both maintain 8.2 V voltage and SOT-23 packaging. DDZX8V2C-7 offers superior voltage tolerance (±2.55%) and lower reverse leakage (100 nA). Use DDZX8V2C-7 only if your application does not require the full 350 mW thermal capability. For applications requiring 350 mW dissipation, use MMBZ5237B-7-F.

Q: Why do some parts have different impedance values (8 Ω vs. 15 Ω vs. 200 Ω)?

A: Impedance (Zzt) represents the dynamic resistance of the Zener diode at the test current. Lower impedance values (8 Ω, 15 Ω) indicate better voltage regulation and lower output impedance. The original CMPZ4101 TR has 200 Ω impedance, which is higher than modern alternatives. Substitutes with lower impedance provide improved performance characteristics. This difference is beneficial for most applications.

Q: What is the significance of operating temperature range -55°C vs. -65°C?

A: The original CMPZ4101 TR operates from -65°C to 150°C. Some substitutes (BZX84B8V2-E3-08, BZX84C8V2-E3-18, BZX84C8V2-G3-08, MMBZ4694-E3-08) have a minimum operating temperature of -55°C. If your application requires operation below -55°C, select substitutes with -65°C minimum rating: BZX84C8V2-7-F, BZX84C8V2LT1G, CZRT5237B-G, CZRT55C8V2-G, DDZX8V2C-7, or MMBZ5237B-7-F.

Q: Is packaging identical across all substitute parts?

A: Yes. All parts use SOT-23-3 packaging (also designated TO-236-3 or SC-59). This ensures mechanical and electrical compatibility with the original CMPZ4101 TR. All parts are surface mount components suitable for automated assembly processes.

Q: Which substitute offers the best overall performance?

A: MMBZ5237B-7-F provides the optimal balance of specifications: 350 mW power rating matching the original, ±5% voltage tolerance, 8 Ohm impedance for superior regulation, active production status, -65°C to 150°C operating range, and high inventory availability (23,400 pcs). This part is the recommended primary substitute.

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