MMBZ5232C-E3-08 Equivalent & Substitute Parts

Part Overview

The MMBZ5232C-E3-08 is a Zener diode rated at 5.6 V nominal with 225 mW maximum power dissipation in a surface mount SOT-23-3 package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete status and limited availability (760 pieces in stock), identification of functionally equivalent substitute parts is necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	5.6	V
Tolerance	±2%	—
Power - Maximum	225	mW
Impedance (Maximum)	11	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 3 V
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	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5232C-E3-08 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 5.6 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface mount
Compliance: RoHS3 compliant, REACH unaffected

Secondary Compatibility Factors:

Power rating: 225 mW or higher
Voltage tolerance: ±2% preferred; ±5% to ±7% acceptable with design verification
Operating temperature range: -55°C to 150°C minimum
Impedance: 11 to 40 Ohms
Reverse leakage current: 1 to 5 µA

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (±2% Tolerance, 225 mW): Parts with identical voltage tolerance and power rating, suitable for direct replacement without circuit redesign.

Category B - Functional Equivalents (Higher Power Rating or Relaxed Tolerance): Parts with 5.6 V nominal voltage, SOT-23-3 package, but with increased power dissipation (250–350 mW) or relaxed tolerance (±5% to ±7%), suitable for applications where higher power margin or tolerance variance is acceptable.

Category C - Specialized Variants: Automotive-grade parts (AEC-Q101 qualified) and array configurations for specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA)	Temp Range (°C)	Status	Package
MMBZ5232C-E3-08	Vishay	5.6	±2%	225	11	5 @ 3V	-55 to 150	Obsolete	SOT-23-3
BZX84B5V6-TP	Micro Commercial Co	5.6	±2%	350	40	1 @ 2V	-55 to 150	Active	SOT-23-3
BZX84B5V6LT1G	onsemi	5.6	±2%	225	40	1 @ 2V	-65 to 150	Active	SOT-23-3
BZX84B5V6Q-7-F	Diodes Incorporated	5.6	±2%	300	40	1 @ 2V	-65 to 150	Active	SOT-23-3
BZX84C5V6LT3G	onsemi	5.6	±7%	225	40	1 @ 2V	-65 to 150	Active	SOT-23-3
BZX84C5V6TS-7-F	Diodes Incorporated	5.6	±6%	200	40	1 @ 2V	-65 to 150	Active	SOT-363
CZRT5232B-HF	Comchip Technology	5.6	±5%	350	12	5 @ 3V	-65 to 150	Active	SOT-23-3
CZRT55C5V6-G	Comchip Technology	5.6	±7%	350	40	1 @ 2V	-65 to 150	Active	SOT-23-3
MMBZ5232B-TP	Micro Commercial Co	5.6	±5%	350	11	5 @ 3V	-55 to 150	Active	SOT-23-3
SZBZX84B5V6LT1G	onsemi	5.6	±2%	225	40	1 @ 2V	-65 to 150	Active	SOT-23-3
SZBZX84C5V6ET1G	onsemi	5.6	±7%	225	40	1 @ 2V	-65 to 150	Active	SOT-23-3

Engineering Selection Recommendations

For Direct Replacement (No Circuit Modification Required):

Select BZX84B5V6LT1G (onsemi) or SZBZX84B5V6LT1G (onsemi, automotive-grade). Both parts maintain the ±2% voltage tolerance and 225 mW power rating of the original MMBZ5232C-E3-08. The onsemi BZX84B5V6LT1G offers extended operating temperature range (-65°C to 150°C) and is in active production with 26,100 pieces in stock. The SZBZX84B5V6LT1G variant includes AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade reliability.

For Applications Tolerating Higher Power Dissipation:

Select BZX84B5V6-TP (Micro Commercial Co) or BZX84B5V6Q-7-F (Diodes Incorporated). Both maintain ±2% tolerance with increased power ratings (350 mW and 300 mW respectively), providing additional thermal margin. BZX84B5V6Q-7-F includes AEC-Q101 qualification for automotive applications.

For Applications Tolerating Relaxed Voltage Tolerance:

Select BZX84C5V6LT3G (onsemi, ±7% tolerance) or CZRT55C5V6-G (Comchip Technology, ±7% tolerance) when circuit design permits voltage tolerance variance. Both are in active production with substantial inventory.

For Automotive Applications:

Select BZX84B5V6Q-7-F (Diodes Incorporated, AEC-Q101) or SZBZX84B5V6LT1G (onsemi, AEC-Q101). Both parts carry automotive qualification and extended temperature range.

All recommended substitutes are RoHS3 compliant, REACH unaffected, and available in active production status.

Frequently Asked Questions (FAQ)

Q: Can BZX84B5V6-TP replace MMBZ5232C-E3-08 directly?

A: Yes. Both parts have 5.6 V nominal voltage, ±2% tolerance, SOT-23-3 package, and surface mount configuration. BZX84B5V6-TP has higher power rating (350 mW vs. 225 mW), which is compatible with the original application. No circuit modification is required.

Q: What is the difference between BZX84B5V6LT1G and BZX84C5V6LT3G?

A: The primary difference is voltage tolerance: BZX84B5V6LT1G maintains ±2% tolerance (matching the original part), while BZX84C5V6LT3G has ±7% tolerance. Both have identical 5.6 V nominal voltage, 225 mW power rating, and SOT-23-3 package. Selection depends on circuit tolerance requirements.

Q: Are automotive-grade variants (AEC-Q101) compatible with non-automotive applications?

A: Yes. Automotive-grade parts (SZBZX84B5V6LT1G, BZX84B5V6Q-7-F) meet or exceed standard commercial specifications and are fully compatible with non-automotive applications. They offer enhanced reliability and extended temperature range.

Q: Why does BZX84C5V6TS-7-F have a different package (SOT-363)?

A: BZX84C5V6TS-7-F is a three-independent-diode array in SOT-363 package, not a single diode. It is not a direct substitute for the single-diode MMBZ5232C-E3-08 in SOT-23-3 package. This part is listed for reference only if array configuration is required.

Q: What is the significance of impedance (Zzt) variation among substitutes?

A: Impedance affects dynamic resistance and voltage regulation characteristics. The original MMBZ5232C-E3-08 has 11 Ohms impedance. Most active substitutes have 40 Ohms impedance, which is acceptable for general voltage regulation applications. CZRT5232B-HF and MMBZ5232B-TP maintain 11–12 Ohms impedance for applications requiring lower dynamic resistance.

Q: Can parts with lower power rating (200 mW) substitute for the 225 mW original?

A: BZX84C5V6TS-7-F has 200 mW rating per diode in an array configuration. For single-diode applications, this is not recommended as it provides insufficient thermal margin. Select parts with 225 mW or higher rating.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the compliance status of the original MMBZ5232C-E3-08.

Q: What is the difference between reverse leakage specifications (5 µA @ 3V vs. 1 µA @ 2V)?

A: Reverse leakage is measured at different reference voltages. The original part specifies 5 µA @ 3V, while most substitutes specify 1 µA @ 2V. Lower leakage current at lower reference voltage indicates superior performance. This difference does not prevent substitution in standard applications.

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