MMBZ5232B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMBZ5232B-TP is a 5.6 V zener diode manufactured by Micro Commercial Co, rated for 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is classified as Active and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical compatibility, and operational parameters. Alternative sources and upgraded variants are available from multiple manufacturers to support supply chain flexibility and design requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	5.6	V
Tolerance	±5%	—
Power - Maximum	350	mW
Impedance (Maximum)	11	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 3 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical and mechanical compatibility with the MMBZ5232B-TP:

Upgrade Substitutes maintain identical electrical specifications (5.6 V nominal, ±5% tolerance, 350 mW power rating, 11 Ohms impedance) and are direct functional replacements. These parts support expanded operating temperature ranges or enhanced availability.

Similar Substitutes share the same zener voltage (5.6 V) and package form factor (SOT-23-3) but differ in one or more of the following parameters: power rating (300 mW or 225 mW), tolerance (±2% or ±7%), impedance (40 Ohms), or reverse leakage current (1 µA @ 2 V). These parts are suitable for applications where the reduced power rating or tighter tolerance does not conflict with circuit requirements.

The critical parameters determining substitution eligibility are:

Zener voltage: 5.6 V (fixed requirement)
Package: SOT-23-3 / TO-236-3 (mechanical compatibility)
Power rating: 350 mW (upgrade), 300 mW or 225 mW (similar)
Tolerance: ±5% (upgrade), ±2% or ±7% (similar)
Operating temperature: -55°C to 150°C minimum (main part), -65°C to 150°C (substitute variants)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Temp Range (°C)	Status	Substitution Type
MMBZ5232B-TP	Micro Commercial Co	5.6	±5%	350	11	-55 to 150	Active	Reference Part
CMPZ5232B TR PBFREE	Central Semiconductor Corp	5.6	±5%	350	11	-65 to 150	Active	Upgrade
MMBZ5232B-7-F	Diodes Incorporated	5.6	±5%	350	11	-65 to 150	Active	Upgrade
BZX84B5V6-7-F	Diodes Incorporated	5.6	±2%	300	40	-65 to 150	Active	Similar
BZX84B5V6-E3-08	Vishay General Semiconductor - Diodes Division	5.6	±2%	300	40	-55 to 150	Active	Similar
BZX84B5V6-E3-18	Vishay General Semiconductor - Diodes Division	5.6	±2%	300	40	-55 to 150	Active	Similar
BZX84B5V6-G3-08	Vishay General Semiconductor - Diodes Division	5.6	±2%	300	40	-55 to 150	Active	Similar
BZX84B5V6-HE3-08	Vishay General Semiconductor - Diodes Division	5.6	±2%	300	40	-55 to 150	Obsolete	Similar
BZX84B5V6LT1G	onsemi	5.6	±2%	225	40	-65 to 150	Active	Similar
BZX84C5V6 TR PBFREE	Central Semiconductor Corp	5.6	±5%	350	40	-65 to 150	Active	Similar
BZX84C5V6-7-F	Diodes Incorporated	5.6	±7%	300	40	-65 to 150	Active	Similar

Engineering Selection Recommendations

Upgrade Substitutes (CMPZ5232B TR PBFREE and MMBZ5232B-7-F) are direct electrical equivalents with identical power ratings and impedance specifications. Both are Active status components with ROHS3 compliance and REACH Unaffected designation. CMPZ5232B TR PBFREE offers expanded lower temperature operation (-65°C vs. -55°C) and higher inventory availability (12,781 units). MMBZ5232B-7-F from Diodes Incorporated provides the largest inventory (61,436 units) and equivalent temperature range expansion.

Similar Substitutes with 300 mW power rating (BZX84B5V6 variants from Diodes Incorporated and Vishay) are suitable for applications where power dissipation does not exceed 300 mW. These parts feature tighter tolerance (±2%) and higher impedance (40 Ohms). The Vishay BZX84B5V6-HE3-08 is marked Obsolete and carries AEC-Q101 automotive qualification; new designs should avoid this part number.

Similar Substitutes with 225 mW power rating (BZX84B5V6LT1G from onsemi) are appropriate for low-power applications. This part maintains ±2% tolerance and supports the expanded temperature range (-65°C to 150°C).

Similar Substitute BZX84C5V6 TR PBFREE from Central Semiconductor Corp maintains 350 mW power rating and ±5% tolerance but exhibits higher impedance (40 Ohms vs. 11 Ohms). This part is suitable where impedance variation is acceptable.

All substitute parts are ROHS3 compliant and REACH Unaffected. Selection should prioritize Active status components and consider inventory availability and temperature range requirements for the specific application.

Frequently Asked Questions (FAQ)

Q: Can CMPZ5232B TR PBFREE or MMBZ5232B-7-F be used as direct replacements for MMBZ5232B-TP?

A: Yes. Both parts are upgrade substitutes with identical electrical specifications (5.6 V, ±5%, 350 mW, 11 Ohms impedance) and the same SOT-23-3 package. Both support expanded operating temperature ranges and are Active status components with full compliance certifications.

Q: What is the difference between upgrade and similar substitutes?

A: Upgrade substitutes maintain all electrical parameters of the reference part (MMBZ5232B-TP) and differ only in temperature range or manufacturer. Similar substitutes share the same zener voltage and package but have different power ratings, tolerance, or impedance. Similar substitutes require circuit analysis to confirm compatibility.

Q: Can I use a 300 mW zener diode (BZX84B5V6-7-F) in place of the 350 mW MMBZ5232B-TP?

A: Substitution is possible only if the circuit design ensures power dissipation does not exceed 300 mW under all operating conditions. The 300 mW rating is a hard limit; exceeding it causes device failure. Circuit simulation or thermal analysis is required to confirm safe operation.

Q: What is the significance of impedance differences (11 Ohms vs. 40 Ohms)?

A: Impedance affects the zener diode's dynamic response and voltage regulation characteristics. The MMBZ5232B-TP has lower impedance (11 Ohms), providing better voltage stability under load transients. Similar substitutes with 40 Ohms impedance exhibit higher dynamic impedance and may not provide equivalent regulation performance in sensitive applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference are ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: Why is BZX84B5V6-HE3-08 marked as Obsolete?

A: BZX84B5V6-HE3-08 is classified as Obsolete by the manufacturer. New designs should not use this part number. Active alternatives include BZX84B5V6-E3-08, BZX84B5V6-G3-08, or BZX84B5V6-7-F from other manufacturers.

Q: What is the difference between ±2%, ±5%, and ±7% tolerance specifications?

A: Tolerance defines the allowable deviation of the zener voltage from the nominal 5.6 V specification. ±2% tolerance (±0.112 V) is tighter than ±5% (±0.28 V) or ±7% (±0.392 V). Tighter tolerance is required for precision voltage regulation; looser tolerance is acceptable for general-purpose applications.

Q: Can I substitute a 225 mW part (BZX84B5V6LT1G) for the 350 mW reference part?

A: Substitution is valid only if circuit power dissipation is confirmed to remain below 225 mW under all operating conditions, including worst-case scenarios. The lower power rating is a design constraint that must be verified through circuit analysis.

Q: What is the operating temperature range significance?

A: The operating temperature range defines the ambient and junction temperature limits for reliable operation. The reference part operates from -55°C to 150°C. Upgrade substitutes extend the lower limit to -65°C, providing operation in colder environments. Similar substitutes maintain the same or equivalent range. Applications requiring operation below -55°C require upgrade or similar substitutes with -65°C rating.

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