MMBZ4617-G3-08 Equivalent & Substitute Parts

Part Overview

The MMBZ4617-G3-08 is a Zener Diode rated at 2.4 V with 350 mW power dissipation in a surface mount SOT-23-3 package, manufactured by Vishay General Semiconductor - Diodes Division. This part is classified as obsolete, necessitating identification of active equivalent components that maintain electrical and mechanical compatibility for ongoing production and repair applications. Substitute parts must satisfy the core electrical specifications: 2.4 V nominal Zener voltage, 350 mW maximum power rating, and SOT-23-3 surface mount packaging.

Substiute Parts

MMBZ4617-G3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 994MMBZ4617-G3-08 Datasheet

Current PartRFQ

BZX84C2V4-TP

Micro Commercial CoIn Stock: 782BZX84C2V4-TP Datasheet

MFR RecommendedRFQ

CZRT55C2V4-G

Comchip TechnologyIn Stock: 939CZRT55C2V4-G Datasheet

MFR RecommendedRFQ

MMBZ5221B-7-F

Diodes IncorporatedIn Stock: 18606MMBZ5221B-7-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBZ4617-G3-08 is determined by strict equivalence in the following parameters:

Primary Substitution Criteria:

• Zener voltage: 2.4 V nominal
• Power dissipation: 350 mW maximum
• Package type: SOT-23-3 surface mount
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

Secondary Compatibility Parameters:

• Operating temperature range: minimum -55°C (acceptable if extended to -65°C)
• Voltage tolerance: ±5% preferred; ±8% acceptable with circuit validation
• Impedance and leakage characteristics: secondary parameters that do not prevent substitution

All identified substitute parts meet the primary criteria. Variations in impedance (Zzt), reverse leakage current (Ir), and forward voltage (Vf) are within acceptable ranges for Zener diode applications and do not preclude functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

MMBZ5221B-7-F (Diodes Incorporated) is the primary substitute for the MMBZ4617-G3-08. This part maintains ±5% voltage tolerance matching the original specification, operates across an extended temperature range (-65°C ~ 150°C), carries active product status with highest inventory availability (18,580 units), and holds ROHS3 compliance with MSL 1 rating. The lower impedance (30 Ω) provides superior performance characteristics compared to the original part.

BZX84C2V4-TP (Micro Commercial Co) serves as a secondary substitute. It matches the original operating temperature range (-55°C ~ 150°C) and maintains ±5% tolerance. Active product status and adequate inventory (721 units) support production requirements. Impedance of 100 Ω represents a middle ground between the original and alternative options.

CZRT55C2V4-G (Comchip Technology) is acceptable as a tertiary option. While tolerance is relaxed to ±8%, the extended temperature range (-65°C ~ 150°C) and active status provide operational flexibility. Inventory of 880 units supports component availability. This part is suitable for applications where the ±8% tolerance does not violate circuit specifications.

All three substitute parts satisfy RoHS3 compliance, MSL 1 rating, and SOT-23-3 packaging requirements. Selection should prioritize MMBZ5221B-7-F based on superior impedance characteristics, highest inventory availability, and exact tolerance match to the original specification.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5221B-7-F directly replace MMBZ4617-G3-08 without circuit modification?

A: Yes. Both parts share identical nominal Zener voltage (2.4 V), power rating (350 mW), voltage tolerance (±5%), and SOT-23-3 package. The lower impedance of MMBZ5221B-7-F (30 Ω versus 1400 Ω) represents an improvement in performance characteristics and does not require circuit redesign.

Q: What is the significance of the impedance difference between the original and substitute parts?

A: Impedance (Zzt) affects the dynamic resistance of the Zener diode at operating current. The original MMBZ4617-G3-08 specifies 1400 Ω maximum impedance, while substitutes range from 30 Ω to 100 Ω. Lower impedance values provide better voltage regulation and reduced output impedance, resulting in superior circuit performance. This difference does not prevent substitution; it represents an enhancement.

Q: Is the ±8% tolerance of CZRT55C2V4-G acceptable as a substitute?

A: CZRT55C2V4-G is acceptable only if circuit design specifications permit ±8% Zener voltage variation. The original MMBZ4617-G3-08 and preferred substitutes (MMBZ5221B-7-F and BZX84C2V4-TP) maintain ±5% tolerance. Circuit validation is required to confirm that ±8% tolerance does not violate system performance requirements.

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

A: Yes. All substitute parts are packaged in SOT-23-3 (TO-236-3, SC-59) surface mount configuration, matching the original MMBZ4617-G3-08. Mechanical compatibility with existing PCB layouts is maintained across all substitutes.

Q: What is the impact of extended operating temperature range on part selection?

A: MMBZ5221B-7-F and CZRT55C2V4-G extend the lower operating temperature to -65°C, compared to -55°C for the original part and BZX84C2V4-TP. Extended temperature range provides additional operational margin for applications requiring low-temperature performance. This does not prevent substitution; it represents an operational advantage.

Q: Do all substitute parts meet RoHS3 and MSL requirements?

A: Yes. All identified substitute parts (BZX84C2V4-TP, CZRT55C2V4-G, and MMBZ5221B-7-F) are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the original MMBZ4617-G3-08 environmental and handling specifications.

Q: Which substitute part offers the best inventory availability?

A: MMBZ5221B-7-F (Diodes Incorporated) provides the highest inventory availability with 18,580 units in stock, compared to 880 units for CZRT55C2V4-G and 721 units for BZX84C2V4-TP. This availability advantage supports production continuity and reduces lead time risk.