MMBZ5236B Zener Diode 7.5V 350mW SOT-23-3 Equivalent & Substitute Parts

Part Overview

The MMBZ5236B is a surface-mount Zener diode manufactured by onsemi, rated for 7.5 V nominal Zener voltage with 350 mW maximum power dissipation in a SOT-23-3 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including Zener voltage, power rating, impedance, and thermal operating range while accommodating variations in tolerance and leakage current specifications.

Key Parameters

Parameter	MMBZ5236B Value	Unit
Voltage - Zener (Nom)	7.5	V
Tolerance	±5%	%
Power - Max	350	mW
Impedance (Max)	6	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 6 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3

Substitute Part Grouping Explanation

Substitution of the MMBZ5236B is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 7.5 V nominal (fixed requirement)
Package type: SOT-23-3 / TO-236-3 / SC-59 (mechanical compatibility)
Mounting type: Surface Mount (process compatibility)
Forward voltage: 900 mV maximum @ 10 mA (circuit performance)

Secondary Compatibility Parameters:

Power rating: 350 mW or higher (thermal capability)
Impedance: 6 Ohms or lower (circuit stability)
Reverse leakage: 3 µA @ 6 V or lower (static performance)
Operating temperature range: -55°C to 150°C minimum (environmental operation)

Tolerance Consideration: Zener voltage tolerance of ±5% is the baseline specification. Parts with tighter tolerance (±1%, ±2%) are acceptable substitutes. Parts with wider tolerance (±6%) are acceptable if circuit design permits.

Product Status Hierarchy: Active parts are preferred over discontinued or obsolete parts. RoHS3 compliance and automotive qualification (AEC-Q101) are beneficial attributes for long-term supply assurance.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 10mA (mV)	Temp Range (°C)	Status	RoHS
MMBZ5236B	onsemi	7.5	±5%	350	6	900	-55 to 150	Obsolete	Unaffected
MMBZ5236BLT1G	onsemi	7.5	±5%	225	6	900	-65 to 150	Active	ROHS3
CMPZ5236B TR PBFREE	Central Semiconductor	7.5	±5%	350	6	900	-65 to 150	Active	ROHS3
MMBZ5236B-7	Diodes Incorporated	7.5	±5%	350	6	900	-65 to 150	Discontinued	Non-compliant
MMBZ5236B-7-F	Diodes Incorporated	7.5	±5%	350	6	900	-65 to 150	Active	ROHS3
MMBZ5236BQ-7-F	Diodes Incorporated	7.5	±5%	350	6	900	-65 to 150	Active	ROHS3
BZX84-A7V5,215	Nexperia USA Inc.	7.5	±1%	250	15	900	-65 to 150	Active	ROHS3
BZX84B7V5-TP	Micro Commercial Co	7.5	±2%	350	15	900	-55 to 150	Active	Not specified
BZX84C7V5 TR PBFREE	Central Semiconductor	7.5	±5%	350	15	900	-65 to 150	Active	ROHS3
BZX84C7V5-7-F	Diodes Incorporated	7.5	±6%	300	15	900	-65 to 150	Active	ROHS3
BZX84C7V5-TP	Micro Commercial Co	7.5	±5%	350	15	900	-55 to 150	Active	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Electrical & Mechanical Equivalents (Preferred):

MMBZ5236BLT1G (onsemi) and CMPZ5236B TR PBFREE (Central Semiconductor) are the primary substitutes. Both maintain the 7.5 V nominal voltage, ±5% tolerance, 6 Ohm impedance, and SOT-23-3 package. MMBZ5236BLT1G is active with RoHS3 compliance and extended temperature range (-65°C to 150°C). CMPZ5236B TR PBFREE matches the original 350 mW power rating with active status and RoHS3 compliance.

Tier 2 - Active Equivalents with Identical Electrical Specifications:

MMBZ5236B-7-F (Diodes Incorporated) and MMBZ5236BQ-7-F (Diodes Incorporated) provide full electrical equivalence with 350 mW power, 6 Ohm impedance, and extended temperature range. MMBZ5236BQ-7-F includes automotive qualification (AEC-Q101) and is suitable for automotive applications.

Tier 3 - Acceptable Substitutes with Parameter Variations:

BZX84C7V5-7-F (Diodes Incorporated) operates at 300 mW with 15 Ohm impedance and ±6% tolerance. This part is acceptable where power dissipation is not critical and circuit impedance tolerance permits higher values.

BZX84-A7V5,215 (Nexperia USA Inc.) provides tighter ±1% tolerance with 250 mW power and 15 Ohm impedance. This part is suitable for precision applications where voltage tolerance is critical.

BZX84C7V5 TR PBFREE (Central Semiconductor) and BZX84C7V5-TP (Micro Commercial Co) maintain 350 mW power with 15 Ohm impedance. These parts are acceptable where impedance variation is tolerated.

Avoid:

MMBZ5236B-7 (Diodes Incorporated) is discontinued at DiGi Electronics and carries RoHS non-compliance status, making it unsuitable for new designs.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5236BLT1G replace MMBZ5236B in all applications?

A: MMBZ5236BLT1G is electrically equivalent with identical Zener voltage (7.5 V), tolerance (±5%), impedance (6 Ohms), and forward voltage characteristics. The power rating is reduced from 350 mW to 225 mW. Substitution is valid if circuit thermal design does not require the full 350 mW dissipation capability. The extended temperature range (-65°C to 150°C) provides improved environmental coverage.

Q: What is the difference between impedance values of 6 Ohms and 15 Ohms?

A: Impedance (Zzt) affects dynamic regulation and transient response. Lower impedance (6 Ohms) provides better voltage stability under load changes. Higher impedance (15 Ohms) results in greater voltage variation with current changes. Parts with 15 Ohm impedance are acceptable substitutes only if circuit design accommodates the increased dynamic impedance.

Q: Are BZX84 series parts compatible with MMBZ5236B?

A: BZX84 series parts share the same 7.5 V Zener voltage and SOT-23-3 package. However, they exhibit higher impedance (15 Ohms versus 6 Ohms) and different leakage current specifications (1 µA @ 5 V versus 3 µA @ 6 V). These parts are acceptable substitutes where circuit design permits impedance variation and lower leakage current is beneficial.

Q: What does RoHS3 compliance mean for this component?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. RoHS3 compliant parts are required for most commercial and industrial applications and are mandatory for European Union markets.

Q: Can I use MMBZ5236BQ-7-F in non-automotive applications?

A: MMBZ5236BQ-7-F is qualified to AEC-Q101 automotive standards but is not restricted to automotive use. It is a direct electrical equivalent suitable for any application requiring the MMBZ5236B specifications. The automotive qualification provides additional reliability assurance.

Q: Why does MMBZ5236BLT1G have lower power rating (225 mW) than the original (350 mW)?

A: MMBZ5236BLT1G is a variant optimized for lower power applications while maintaining identical voltage and impedance characteristics. Selection depends on circuit thermal requirements. If maximum power dissipation does not exceed 225 mW, this part provides equivalent performance with active product status and RoHS3 compliance.

Q: What packaging formats are available for these substitutes?

A: All listed substitutes use SOT-23-3 / TO-236-3 surface-mount packages. Packaging options include Cut Tape (CT), Digi-Reel, Tape & Reel (TR), and Bulk formats. Selection depends on manufacturing process requirements and order quantities.

Q: Is tolerance variation between ±1%, ±2%, ±5%, and ±6% significant?

A: Tolerance variation affects Zener voltage accuracy. Tighter tolerance (±1%, ±2%) provides more precise voltage regulation. Wider tolerance (±6%) permits greater voltage variation. Selection depends on circuit design requirements. If the application requires voltage within ±5%, parts with ±1% or ±2% tolerance are acceptable upgrades.

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