CZRT5230B-HF Zener Diode 4.7V 350mW SOT-23-3 Equivalent & Substitute Parts

Part Overview

The CZRT5230B-HF is a surface mount Zener diode manufactured by Comchip Technology, rated at 4.7 V nominal with 350 mW maximum power dissipation in SOT-23-3 packaging. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.7	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	19	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65°C 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 CZRT5230B-HF is determined by strict equivalence in the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 4.7 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

Power rating: 350 mW (substitute parts rated 300 mW or higher are acceptable)
Impedance: 19 Ohms (substitute parts with impedance ≤80 Ohms are acceptable)
Reverse leakage current: ≤5 µA @ 2 V
Forward voltage: 900 mV maximum @ 10 mA
Tolerance: ±5% or tighter

Substitute parts are grouped into two categories: MFR Recommended (manufacturer-endorsed alternatives) and Parametric Equivalent (parts meeting all electrical and mechanical specifications).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max)	Temp Range	Package	Status
CZRT5230B-HF	Comchip Technology	4.7 V	±5%	350 mW	19 Ω	5 µA @ 2 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	Active
BZX84B4V7-7-F	Diodes Incorporated	4.7 V	±2%	300 mW	80 Ω	3 µA @ 2 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	Active
BZX84B4V7Q-7-F	Diodes Incorporated	4.7 V	±2%	300 mW	80 Ω	3 µA @ 2 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	Active
BZX84C4V7-7-F	Diodes Incorporated	4.7 V	±6%	300 mW	80 Ω	3 µA @ 2 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	Active
BZX84C4V7-TP	Micro Commercial Co	4.7 V	±5%	350 mW	80 Ω	3 µA @ 2 V	900 mV @ 10 mA	-55°C to 150°C	SOT-23-3	Active
MMBZ5230B-TP	Micro Commercial Co	4.7 V	±5%	350 mW	19 Ω	5 µA @ 2 V	900 mV @ 10 mA	-55°C to 150°C	SOT-23-3	Active
CMPZ5230B TR PBFREE	Central Semiconductor Corp	4.7 V	±5%	350 mW	19 Ω	5 µA @ 2 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	Active
MMBZ5230B-7-F	Diodes Incorporated	4.7 V	±5%	350 mW	19 Ω	5 µA @ 2 V	900 mV @ 10 mA	-65°C to 150°C	SOT-23-3	Active

Engineering Selection Recommendations

MFR Recommended Substitutes (Manufacturer-Endorsed):

BZX84B4V7-7-F (Diodes Incorporated) is a manufacturer-recommended substitute with tighter tolerance (±2%) and lower reverse leakage (3 µA). Power rating is 300 mW, which is acceptable for applications not requiring the full 350 mW capability. Impedance is 80 Ohms, higher than the original part. Operating temperature range matches the original specification.

BZX84B4V7Q-7-F (Diodes Incorporated) is an automotive-grade alternative (AEC-Q101 qualified) with identical electrical specifications to BZX84B4V7-7-F. This part is suitable for automotive and high-reliability applications requiring formal qualification documentation.

BZX84C4V7-7-F (Diodes Incorporated) offers the widest tolerance (±6%) with 300 mW power rating and 80 Ohms impedance. This part is suitable for cost-sensitive applications where tolerance relaxation is acceptable.

Parametric Equivalent Substitutes (Full Specification Match):

CMPZ5230B TR PBFREE (Central Semiconductor Corp) provides complete parametric equivalence with the original CZRT5230B-HF, including 350 mW power rating, 19 Ohms impedance, and -65°C to 150°C operating range. All electrical characteristics match the original specification exactly.

MMBZ5230B-7-F (Diodes Incorporated) is a parametric equivalent with identical power rating (350 mW), impedance (19 Ohms), and operating temperature range (-65°C to 150°C). This part is available in Cut Tape & Digi-Reel packaging.

MMBZ5230B-TP (Micro Commercial Co) matches all electrical specifications of the original part with 350 mW power and 19 Ohms impedance. Operating temperature range is -55°C to 150°C, which is acceptable for most applications but does not extend to -65°C.

BZX84C4V7-TP (Micro Commercial Co) provides 350 mW power rating matching the original specification. Operating temperature range is -55°C to 150°C. Impedance is 80 Ohms. This part is suitable for applications not requiring the full -65°C lower temperature limit.

All substitute parts are ROHS3 compliant, Moisture Sensitivity Level 1, and Active product status.

Frequently Asked Questions (FAQ)

Q: Can BZX84B4V7-7-F replace CZRT5230B-HF in all applications?

A: BZX84B4V7-7-F is electrically compatible for most applications. The 300 mW power rating is lower than the original 350 mW specification. Applications requiring full 350 mW dissipation capability must use CMPZ5230B TR PBFREE, MMBZ5230B-7-F, MMBZ5230B-TP, or BZX84C4V7-TP. The ±2% tolerance of BZX84B4V7-7-F is tighter than the original ±5%, providing improved voltage regulation accuracy.

Q: What is the difference between BZX84B4V7-7-F and BZX84B4V7Q-7-F?

A: Both parts have identical electrical specifications (4.7 V, ±2%, 300 mW, SOT-23-3). BZX84B4V7Q-7-F is automotive-grade with AEC-Q101 qualification, suitable for automotive and high-reliability applications requiring formal qualification documentation. BZX84B4V7-7-F is the standard industrial version.

Q: Which substitute provides the closest match to CZRT5230B-HF?

A: CMPZ5230B TR PBFREE and MMBZ5230B-7-F provide complete parametric equivalence, matching all electrical specifications including 350 mW power rating, 19 Ohms impedance, ±5% tolerance, and -65°C to 150°C operating range. MMBZ5230B-TP is also a full match except for the lower temperature limit (-55°C instead of -65°C).

Q: Are all substitute parts available in the same packaging?

A: All substitute parts use SOT-23-3 package (TO-236-3, SC-59). Packaging format differs: CZRT5230B-HF is supplied in Tape & Reel (TR). BZX84B4V7-7-F, BZX84B4V7Q-7-F, and BZX84C4V7-7-F are available in Cut Tape (CT) & Digi-Reel. BZX84C4V7-TP, MMBZ5230B-TP, and CMPZ5230B TR PBFREE are supplied in Tape & Reel. MMBZ5230B-7-F is available in Cut Tape & Digi-Reel.

Q: What is the impedance difference between substitute parts?

A: The original CZRT5230B-HF has 19 Ohms maximum impedance. BZX84B4V7-7-F, BZX84B4V7Q-7-F, BZX84C4V7-7-F, and BZX84C4V7-TP have 80 Ohms impedance. CMPZ5230B TR PBFREE, MMBZ5230B-7-F, and MMBZ5230B-TP maintain 19 Ohms impedance. Lower impedance provides better voltage regulation and faster transient response.

Q: Can I use BZX84C4V7-7-F if my application requires -65°C operation?

A: No. BZX84C4V7-7-F operating temperature range is -65°C to 150°C, which meets the -65°C requirement. However, verify your specific application's lower temperature limit. For guaranteed -65°C operation, use CZRT5230B-HF, CMPZ5230B TR PBFREE, or MMBZ5230B-7-F.

Q: What is the tolerance difference between substitute parts?

A: CZRT5230B-HF has ±5% tolerance. BZX84B4V7-7-F and BZX84B4V7Q-7-F offer tighter ±2% tolerance. BZX84C4V7-7-F has ±6% tolerance. CMPZ5230B TR PBFREE, MMBZ5230B-7-F, MMBZ5230B-TP, and BZX84C4V7-TP maintain ±5% tolerance. Tighter tolerance improves voltage regulation accuracy but may increase component cost.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts are Active product status.

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