CZRT55C20-G Zener Diode 20V 350mW SOT-23-3 Equivalent & Substitute Parts

Part Overview

The CZRT55C20-G is a 20V Zener diode manufactured by Comchip Technology, rated for 350mW power dissipation in a surface mount SOT-23-3 package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications including nominal Zener voltage, power rating, impedance characteristics, and package compatibility. Alternative sources become necessary for supply chain continuity, inventory availability, or design flexibility across manufacturing partners.

Substiute Parts

CZRT55C20-G

Comchip TechnologyIn Stock: 833CZRT55C20-G Datasheet

Current PartRFQ

BZX84B20-7-F

Diodes IncorporatedIn Stock: 4692BZX84B20-7-F Datasheet

MFR RecommendedRFQ

BZX84B20Q-7-F

Diodes IncorporatedIn Stock: 29416BZX84B20Q-7-F Datasheet

MFR RecommendedRFQ

BZX84C20-7-F

Diodes IncorporatedIn Stock: 9168BZX84C20-7-F Datasheet

MFR RecommendedRFQ

BZX84C20-TP

Micro Commercial CoIn Stock: 3822BZX84C20-TP Datasheet

MFR RecommendedRFQ

MMBZ5250B-7-F

Diodes IncorporatedIn Stock: 38170MMBZ5250B-7-F Datasheet

MFR RecommendedRFQ

MMBZ5250B-TP

Micro Commercial CoIn Stock: 14456MMBZ5250B-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the CZRT55C20-G is based on the following critical parameters that must align for direct replacement:

Primary Matching Criteria:

• Nominal Zener voltage: 20V (exact match required)
• Package type: SOT-23-3 surface mount (mechanical and electrical compatibility)
• Reverse leakage current: 100nA @ 14V (functional equivalence)
• Forward voltage: 900mV @ 10mA (circuit behavior consistency)
• Operating temperature range: -65°C to 150°C minimum (thermal compatibility)

Secondary Matching Criteria:

• Power rating: 350mW or higher (allows downrating to 300mW in specific cases)
• Impedance: 55 Ohms maximum (electrical characteristic tolerance)
• Tolerance: ±6% or tighter (voltage regulation precision)

Compliance Requirements:

• ROHS3 compliant
• Moisture Sensitivity Level 1 (Unlimited)
• Active product status

Substitute parts are grouped into two categories based on power rating alignment: 350mW direct equivalents and 300mW alternatives with tighter voltage tolerance specifications.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (350mW Power Rating):

BZX84C20-TP and MMBZ5250B-TP are direct functional equivalents with 350mW power ratings matching the CZRT55C20-G. Both maintain the 20V nominal Zener voltage and SOT-23-3 package compatibility. BZX84C20-TP operates across -55°C to 150°C, while MMBZ5250B-TP shares the same temperature range. Both are ROHS3 compliant with MSL 1 rating. The MMBZ5250B series offers lower impedance (25Ω vs 55Ω), providing improved voltage regulation characteristics in applications requiring tighter output stability.

Tighter Tolerance Alternatives (300mW Power Rating):

BZX84B20-7-F and BZX84B20Q-7-F provide ±2% voltage tolerance compared to the ±6% specification of the main part. These 300mW rated devices are suitable for applications where power dissipation does not exceed 300mW and tighter voltage regulation is required. BZX84B20Q-7-F carries AEC-Q101 automotive qualification and operates across the full -65°C to 150°C range. BZX84C20-7-F maintains ±6% tolerance with 300mW rating, offering a middle-ground option.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and Active product status. MMBZ5250B-7-F offers the highest inventory availability (38,100 pcs) with full temperature range coverage (-65°C to 150°C). BZX84B20Q-7-F provides 29,400 pcs inventory with automotive-grade qualification.

Frequently Asked Questions (FAQ)

Q: Can BZX84B20-7-F replace CZRT55C20-G in all applications?

A: BZX84B20-7-F is electrically compatible for applications where power dissipation does not exceed 300mW. The main part is rated 350mW; the substitute is rated 300mW. Both share identical 20V nominal voltage, 55Ω impedance, 900mV forward voltage, and -65°C to 150°C operating range. Verify circuit power requirements before substitution.

Q: What is the difference between BZX84C20-7-F and BZX84B20-7-F?

A: Both are 300mW rated Zener diodes in SOT-23-3 packages with 20V nominal voltage. BZX84B20-7-F specifies ±2% tolerance, while BZX84C20-7-F specifies ±6% tolerance. The tighter tolerance of BZX84B20-7-F provides more precise voltage regulation. Both operate across -65°C to 150°C.

Q: Why do MMBZ5250B parts have lower impedance (25Ω vs 55Ω)?

A: Impedance is a characteristic of the Zener diode design and manufacturing process. Lower impedance (25Ω) in MMBZ5250B series results in better voltage regulation and lower output impedance under load changes. This is a design advantage for applications requiring stable reference voltages.

Q: Is BZX84C20-TP suitable for -65°C operation?

A: BZX84C20-TP operates across -55°C to 150°C. It is not rated for operation below -55°C. If the application requires -65°C minimum temperature, select alternatives such as BZX84B20-7-F, BZX84C20-7-F, MMBZ5250B-7-F, or the original CZRT55C20-G.

Q: Can I use MMBZ5250B-TP instead of MMBZ5250B-7-F?

A: Both parts are electrically identical with 20V nominal voltage, 350mW power rating, ±5% tolerance, and 25Ω impedance. MMBZ5250B-TP operates -55°C to 150°C, while MMBZ5250B-7-F operates -65°C to 150°C. Select based on minimum operating temperature requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (BZX84B20-7-F, BZX84B20Q-7-F, BZX84C20-7-F, BZX84C20-TP, MMBZ5250B-7-F, MMBZ5250B-TP) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What does AEC-Q101 qualification on BZX84B20Q-7-F indicate?

A: AEC-Q101 is an automotive electronics qualification standard. BZX84B20Q-7-F meets automotive-grade reliability and performance requirements. This qualification is relevant only if the application requires automotive-grade components.