MMBZ5221BT-7-F Equivalent & Substitute Parts

Part Overview

The MMBZ5221BT-7-F is a Zener Diode rated at 2.4 V nominal with 150 mW maximum power dissipation, manufactured by Diodes Incorporated in SOT-523 surface mount packaging. This component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are necessary when SOT-523 packaging is unavailable, when higher power ratings are required, or when alternative package geometries are mandated by circuit board design constraints.

Substiute Parts

MMBZ5221BT-7-F

Diodes IncorporatedIn Stock: 96310MMBZ5221BT-7-F Datasheet

Current PartRFQ

BZX84C2V4W-7-F

Diodes IncorporatedIn Stock: 33461BZX84C2V4W-7-F Datasheet

MFR RecommendedRFQ

BZX84-A2V4,215

NXP USA Inc.In Stock: 3543BZX84-A2V4,215 Datasheet

MFR RecommendedRFQ

BZX84-A2V4,235

NXP USA Inc.In Stock: 33563BZX84-A2V4,235 Datasheet

MFR RecommendedRFQ

BZX884-C2V4,315

Nexperia USA Inc.In Stock: 20693BZX884-C2V4,315 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMBZ5221BT-7-F is determined by the following critical parameters: nominal Zener voltage (2.4 V), forward voltage characteristics (900 mV @ 10 mA), operating temperature range capability, and surface mount mounting type. All substitute parts maintain the 2.4 V nominal Zener voltage specification. Substitutes differ in power dissipation ratings (150 mW to 250 mW), package form factors (SOT-523, SOT-323, SOT-23, DFN1006-2), impedance specifications, and tolerance ranges (±1% to ±8%). The MMBZ5221BT-7-F operates from -65°C to 150°C; substitute parts operate within -65°C to 125°C or -65°C to 150°C ranges. All substitute parts are surface mount devices with ROHS3 compliance and MSL 1 rating.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain the 2.4 V nominal Zener voltage and 900 mV forward voltage characteristics required for functional equivalence. Selection among substitutes depends on specific application constraints:

BZX84C2V4W-7-F (Diodes Incorporated): Provides 200 mW power rating in SOT-323 packaging. Operating temperature range is -65°C to 125°C, which is 25°C lower than the main part at the upper limit. This substitute is suitable for applications not requiring the full 150°C upper temperature capability. ROHS3 compliant with MSL 1 rating.

BZX84-A2V4,215 and BZX84-A2V4,235 (NXP USA Inc.): Both offer 250 mW power rating with ±1% tolerance in SOT-23 packaging. Operating temperature range extends to 150°C, matching the main part specification. Both parts carry AEC-Q101 automotive qualification. BZX84-A2V4,215 is supplied in tape and reel; BZX84-A2V4,235 is supplied in bulk packaging. These substitutes provide superior tolerance specification and higher power dissipation capability.

BZX884-C2V4,315 (Nexperia USA Inc.): Delivers 250 mW power rating in DFN1006-2 (SOD-882) ultra-compact packaging. Operating temperature range is -65°C to 150°C. Carries AEC-Q100 automotive qualification. ROHS3 compliant with MSL 1 rating. This substitute is optimal for space-constrained applications requiring higher power dissipation.

All substitute parts are Active product status with ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the main part.

Frequently Asked Questions (FAQ)

Q: Can BZX84C2V4W-7-F replace MMBZ5221BT-7-F in all applications?

A: BZX84C2V4W-7-F maintains the 2.4 V nominal Zener voltage and 900 mV forward voltage specification. However, the operating temperature range is -65°C to 125°C, compared to -65°C to 150°C for the main part. Applications requiring operation above 125°C require alternative substitutes. The 200 mW power rating exceeds the 150 mW requirement of the main part.

Q: What is the difference between BZX84-A2V4,215 and BZX84-A2V4,235?

A: Both parts are electrically identical with 2.4 V nominal Zener voltage, 250 mW power rating, ±1% tolerance, and -65°C to 150°C operating range. The primary difference is packaging: BZX84-A2V4,215 is supplied in tape and reel format; BZX84-A2V4,235 is supplied in bulk. Both are SOT-23 package devices with AEC-Q101 automotive qualification.

Q: Is BZX884-C2V4,315 compatible with SOT-523 footprints?

A: No. BZX884-C2V4,315 uses DFN1006-2 (SOD-882) packaging, which has a different footprint than SOT-523. Circuit board redesign is required to accommodate this substitute. DFN1006-2 is a smaller ultra-compact package suitable for space-constrained designs.

Q: Which substitute offers the best tolerance specification?

A: BZX84-A2V4,215 and BZX84-A2V4,235 both offer ±1% tolerance, compared to ±5% for the main part and ±8% for BZX84C2V4W-7-F. BZX884-C2V4,315 matches the main part at ±5% tolerance.

Q: Are all substitutes automotive qualified?

A: BZX84-A2V4,215 and BZX84-A2V4,235 carry AEC-Q101 qualification. BZX884-C2V4,315 carries AEC-Q100 qualification. BZX84C2V4W-7-F does not specify automotive qualification. Selection depends on automotive grade requirements for the application.

Q: What is the impedance difference between the main part and substitutes?

A: The main part MMBZ5221BT-7-F specifies 30 Ohms maximum impedance. All substitute parts specify 100 Ohms maximum impedance. This higher impedance may affect circuit performance in applications sensitive to Zener impedance characteristics.

Q: Do all parts have the same reverse leakage current specification?

A: No. The main part specifies 100 µA @ 1 V reverse leakage current. All substitute parts specify 50 µA @ 1 V, representing lower leakage current. This improved specification in substitutes may benefit low-power applications.