MMBZ5251BW-7-F Equivalent & Substitute Parts

Part Overview

The MMBZ5251BW-7-F is a surface mount Zener diode manufactured by Diodes Incorporated, rated at 22 V nominal Zener voltage with 200 mW maximum power dissipation in SOT-323 packaging. This component is classified as Active product status and carries AEC-Q101 automotive qualification. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within specified tolerance ranges and operating conditions.

Substiute Parts

MMBZ5251BW-7-F

Diodes IncorporatedIn Stock: 999MMBZ5251BW-7-F Datasheet

Current PartRFQ

BZX84C22W-7-F

Diodes IncorporatedIn Stock: 2259BZX84C22W-7-F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for Zener diodes is determined by matching the following critical parameters:

1. Nominal Zener Voltage (Vz): Must be 22 V
2. Maximum Power Dissipation: Must be 200 mW
3. Package Type: Must be SOT-323 (SC-70)
4. Mounting Configuration: Must be Surface Mount
5. Voltage Tolerance: Acceptable range ±5% to ±6%
6. Operating Temperature Range: Must support minimum -65°C to 125°C
7. Compliance Standards: RoHS3 compliance and automotive-grade qualification required

The substitute part BZX84C22W-7-F meets these criteria with allowable variations in impedance and reverse leakage specifications within the functional operating envelope.

Parameter Comparison

Engineering Selection Recommendations

Both MMBZ5251BW-7-F and BZX84C22W-7-F are Active product status components manufactured by Diodes Incorporated with ROHS3 compliance and MSL Level 1 rating. The primary distinction is the operating temperature maximum: MMBZ5251BW-7-F supports -65°C to 150°C, while BZX84C22W-7-F supports -65°C to 125°C. Selection between these parts depends on application thermal requirements. The MMBZ5251BW-7-F is specified with AEC-Q101 automotive qualification and ±5% tolerance, whereas BZX84C22W-7-F carries ±6% tolerance. Both components share identical 22 V nominal Zener voltage, 200 mW power rating, SOT-323 package, and forward voltage characteristics. Impedance variation (29 Ohms versus 55 Ohms) reflects manufacturing differences within the same product family and does not preclude functional substitution in standard voltage regulation applications.

Frequently Asked Questions (FAQ)

Q: Can BZX84C22W-7-F replace MMBZ5251BW-7-F in all applications?

A: Substitution is valid for applications operating within -65°C to 125°C temperature range. Applications requiring operation above 125°C junction temperature require the MMBZ5251BW-7-F due to its extended 150°C maximum rating.

Q: What is the significance of the ±5% versus ±6% tolerance difference?

A: The MMBZ5251BW-7-F maintains tighter tolerance (±5%) compared to BZX84C22W-7-F (±6%). Applications with strict Zener voltage regulation requirements should specify the tighter tolerance part.

Q: Are both parts pin-compatible?

A: Yes. Both components use identical SOT-323 (SC-70) packaging with the same pinout configuration, enabling direct mechanical and electrical substitution on PCB layouts.

Q: What does the impedance difference indicate?

A: Impedance (Zzt) of 29 Ohms versus 55 Ohms reflects internal device characteristics. Both values fall within acceptable ranges for standard Zener diode applications and do not affect basic voltage regulation function.

Q: Are both parts suitable for automotive applications?

A: MMBZ5251BW-7-F carries explicit AEC-Q101 automotive qualification. BZX84C22W-7-F is ROHS3 compliant and Active status but does not list AEC-Q101 qualification in the provided specifications. Automotive applications requiring formal qualification should specify MMBZ5251BW-7-F.

Q: What is the reverse leakage current difference?

A: MMBZ5251BW-7-F specifies 100 nA @ 17 V, while BZX84C22W-7-F specifies 100 nA @ 15.4 V. Both maintain equivalent leakage performance within their respective measurement conditions.