MMBZ5239B-7 Equivalent & Substitute Parts

Part Overview

The MMBZ5239B-7 is a Zener diode manufactured by Diodes Incorporated, rated at 9.1 V nominal with 350 mW maximum power dissipation in a surface mount SOT-23-3 package. This component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with allowable parameter variations within engineering tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	9.1	V
Tolerance	±5%	—
Power - Maximum	350	mW
Impedance (Maximum)	10	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 7 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5239B-7 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 9.1 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface mount
Operating temperature range: Minimum -55°C to 150°C

Allowable Variations:

Power dissipation: 250 mW to 350 mW (substitute parts rated at 250 mW or 300 mW are acceptable for applications not requiring the full 350 mW specification)
Tolerance: ±1% to ±5% (tighter tolerances are acceptable)
Impedance: 10 to 15 Ohms (substitute parts with higher impedance remain functionally compatible)
Reverse leakage current: 500 nA to 3 µA (lower leakage is acceptable)

Substitute parts are grouped by manufacturer and product status. Parts with active status and RoHS3 compliance are preferred for new designs. Automotive-qualified parts (AEC-Q101) provide additional reliability assurance where applicable.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr	Temp Range (°C)	Package	Product Status	RoHS
MMBZ5239B-7	Diodes Incorporated	9.1	±5%	350	10	3 µA @ 7 V	-65 to 150	SOT-23-3	Discontinued	Non-compliant
MMBZ5239B-7-F	Diodes Incorporated	9.1	±5%	350	10	3 µA @ 7 V	-65 to 150	SOT-23-3	Active	RoHS3 Compliant
BZX84-A9V1,215	Nexperia USA Inc.	9.1	±1%	250	15	500 nA @ 6 V	-65 to 150	SOT-23-3	Active	RoHS3 Compliant
BZX84-B9V1,215	NXP USA Inc.	9.1	±2%	250	15	500 nA @ 6 V	-65 to 150	SOT-23-3	Active	RoHS3 Compliant
BZX84B9V1-G3-08	Vishay General Semiconductor	9.1	±2%	300	15	500 nA @ 6 V	-55 to 150	SOT-23-3	Active	RoHS3 Compliant
BZX84B9V1-G3-18	Vishay General Semiconductor	9.1	±2%	300	15	500 nA @ 6 V	-55 to 150	SOT-23-3	Active	RoHS3 Compliant
BZX84C9V1 TR	Central Semiconductor Corp	9.1	±5%	350	15	500 nA @ 6 V	-65 to 150	SOT-23-3	Active	RoHS3 Compliant
BZX84C9V1-G3-08	Vishay General Semiconductor	9.1	±5%	300	15	500 nA @ 6 V	-55 to 150	SOT-23-3	Active	RoHS3 Compliant
BZX84C9V1-G3-18	Vishay General Semiconductor	9.1	±5%	300	15	500 nA @ 6 V	-55 to 150	SOT-23-3	Active	RoHS3 Compliant
BZX84C9V1-HE3-18	Vishay General Semiconductor	9.1	±5%	300	15	500 nA @ 6 V	-55 to 150	SOT-23-3	Obsolete	RoHS3 Compliant
BZX84C9V1-TP	Micro Commercial Co	9.1	±5%	350	15	500 nA @ 6 V	-55 to 150	SOT-23-3	Active	RoHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred for Replacement):

MMBZ5239B-7-F is the direct equivalent manufactured by Diodes Incorporated. This part maintains identical electrical specifications (9.1 V, ±5%, 350 mW) and package configuration. The primary distinction is product status (active versus discontinued) and RoHS3 compliance. This part is suitable for direct substitution in existing designs without circuit modification.

Functional Substitutes with Active Product Status:

Parts meeting the 9.1 V zener voltage specification with SOT-23-3 packaging and active product status include:

BZX84C9V1 TR (Central Semiconductor Corp): Matches the original 350 mW power rating and ±5% tolerance. RoHS3 compliant and actively produced.
BZX84C9V1-TP (Micro Commercial Co): Provides 350 mW power dissipation with ±5% tolerance. Operating temperature range extends to -55°C minimum (versus -65°C on original). RoHS3 compliant.
BZX84B9V1-G3-08 and BZX84B9V1-G3-18 (Vishay General Semiconductor): Rated at 300 mW with ±2% tolerance. Operating temperature minimum is -55°C. Both are RoHS3 compliant and actively produced.
BZX84C9V1-G3-08 and BZX84C9V1-G3-18 (Vishay General Semiconductor): Rated at 300 mW with ±5% tolerance. Operating temperature minimum is -55°C. Both are RoHS3 compliant and actively produced.

Lower Power Alternatives (For Power-Constrained Applications):

BZX84-A9V1,215 (Nexperia USA Inc.): 250 mW rated power with superior ±1% tolerance. Suitable for applications where 350 mW dissipation is not required. AEC-Q101 automotive qualified. RoHS3 compliant.
BZX84-B9V1,215 (NXP USA Inc.): 250 mW rated power with ±2% tolerance. AEC-Q101 automotive qualified. RoHS3 compliant.

Parts to Avoid:

BZX84C9V1-HE3-18 (Vishay) is marked as obsolete and should not be selected for new designs despite RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5239B-7-F be used as a direct replacement for MMBZ5239B-7?

A: Yes. MMBZ5239B-7-F is electrically and mechanically identical to MMBZ5239B-7. The primary difference is product status (active versus discontinued) and RoHS3 compliance. No circuit modifications are required.

Q: What is the difference between 250 mW, 300 mW, and 350 mW rated parts?

A: Power rating indicates maximum continuous power dissipation. A 250 mW part operates within specification at lower power levels than a 350 mW part. Selection depends on circuit current and voltage conditions. If circuit analysis confirms power dissipation below 250 mW, lower-rated parts are acceptable. If dissipation approaches or exceeds 250 mW, select 300 mW or 350 mW rated parts.

Q: Are Nexperia and NXP parts interchangeable with Diodes Incorporated parts?

A: Nexperia and NXP parts with matching 9.1 V zener voltage, SOT-23-3 package, and compatible tolerance specifications are functionally interchangeable. Verify that circuit power dissipation requirements do not exceed the substitute part's power rating.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard. Parts bearing this qualification have undergone additional reliability testing. These parts are suitable for automotive and high-reliability applications but are not required for general industrial or consumer applications.

Q: Can I use a part with -55°C minimum operating temperature instead of -65°C?

A: This depends on application requirements. If the circuit operates above -55°C, a part rated to -55°C is acceptable. If the circuit must operate at temperatures below -55°C, only parts rated to -65°C or lower are suitable.

Q: What is the significance of tolerance (±1%, ±2%, ±5%)?

A: Tolerance specifies the allowable deviation from the nominal 9.1 V zener voltage. A ±1% part maintains zener voltage between 9.009 V and 9.191 V. A ±5% part maintains voltage between 8.645 V and 9.555 V. Tighter tolerance (±1%) provides more precise voltage regulation. Circuit design determines whether tighter tolerance is necessary.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant. The original MMBZ5239B-7 is RoHS non-compliant. If RoHS compliance is a design requirement, select from the active substitute parts listed.

Q: What packaging options are available?

A: All listed parts use SOT-23-3 (also designated TO-236-3 or SC-59) surface mount package. Packaging variations include Tape & Reel (TR), Bulk, and Cut Tape (CT) & Digi-Reel. These are supply format variations, not physical package differences. The component footprint and pinout remain identical.

Q: Which substitute part should I select for a new design?

A: For new designs requiring RoHS3 compliance and active product status, MMBZ5239B-7-F (Diodes Incorporated) or BZX84C9V1 TR (Central Semiconductor Corp) are primary selections, as both maintain the original 350 mW power rating and ±5% tolerance. For automotive applications, BZX84-A9V1,215 or BZX84-B9V1,215 (Nexperia/NXP) with AEC-Q101 qualification are appropriate. Verify power dissipation requirements before selecting lower-rated alternatives.

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