BZT52B3V6-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The BZT52B3V6-TP is a 3.6 V Zener diode manufactured by Micro Commercial Co, rated for 410 mW maximum power dissipation in a surface mount SOD-123 package. This component is classified as Active and is ROHS3 compliant. Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit tolerance or performance variations within specified electrical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	3.6	V
Tolerance	±2%	—
Power - Maximum	410	mW
Impedance (Maximum)	95	Ohms
Current - Reverse Leakage @ Vr	15	µA @ 1 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-55 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the BZT52B3V6-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 3.6 V nominal
Package type: SOD-123 surface mount
Mounting type: Surface mount
RoHS compliance: ROHS3 Compliant
REACH status: REACH Unaffected

Secondary Substitution Criteria:

Power rating: Minimum 410 mW (higher ratings acceptable)
Voltage tolerance: ±2% to ±5% (wider tolerances acceptable)
Operating temperature range: Minimum -55°C to 150°C (extended ranges acceptable)
Forward voltage and reverse leakage characteristics within specified ranges

Substitute parts must maintain the 3.6 V Zener voltage specification and SOD-123 package format. Parts with higher power ratings (500 mW) are acceptable as they provide equivalent or superior performance. Tolerance variations from ±2% to ±5% are permissible depending on circuit requirements. Operating temperature ranges may vary; applications requiring the full -55°C to 175°C range of the primary part require verification of substitute temperature specifications.

Parameter Comparison

Parameter	BZT52B3V6-TP (Main)	BZT52C3V6-HE3-08	DDZ9685-7	MMSZ3V6T1G	MMSZ4685T1G
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	Diodes Incorporated	onsemi	onsemi
Voltage - Zener (Nom)	3.6 V	3.6 V	3.6 V	3.6 V	3.6 V
Tolerance	±2%	±5%	±5%	±5%	±5%
Power - Max	410 mW	410 mW	500 mW	500 mW	500 mW
Impedance (Max)	95 Ohms	95 Ohms	—	90 Ohms	—
Current - Reverse Leakage @ Vr	15 µA @ 1 V	—	7.5 µA @ 2 V	5 µA @ 1 V	7.5 µA @ 2 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	—	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-55°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123	SOD-123	SOD-123	SOD-123
Product Status	Active	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status):

DDZ9685-7, MMSZ3V6T1G, and MMSZ4685T1G are all Active products with ROHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the BZT52B3V6-TP. These three parts maintain the 3.6 V Zener voltage and SOD-123 package specification. All three offer 500 mW power ratings, providing superior thermal performance compared to the 410 mW primary part. Tolerance specifications widen to ±5%, which is acceptable for applications not requiring the ±2% precision of the primary part.

Secondary Substitute (Obsolete Status):

BZT52C3V6-HE3-08 is classified as Obsolete and carries an Automotive grade qualification with AEC-Q101 certification. This part maintains the 410 mW power rating and 95 Ohm impedance specification of the primary part but operates only to 150°C maximum junction temperature. The ±5% tolerance and Obsolete status make this part suitable only when automotive qualification is a specific design requirement and supply availability is confirmed.

Temperature Range Consideration:

Applications requiring operation across the full -55°C to 175°C range of the BZT52B3V6-TP must use the primary part, as all substitute options are limited to 150°C maximum operating temperature.

Frequently Asked Questions (FAQ)

Q: Can MMSZ3V6T1G or MMSZ4685T1G replace BZT52B3V6-TP in all applications?

A: Both onsemi parts are electrically compatible substitutes for the 3.6 V Zener function in SOD-123 packages. However, applications requiring operation above 150°C junction temperature cannot use these substitutes. The ±5% tolerance of these parts differs from the ±2% tolerance of the primary part; circuit designs dependent on tighter voltage tolerance must account for this difference.

Q: What is the difference between DDZ9685-7 and the onsemi alternatives?

A: DDZ9685-7 is manufactured by Diodes Incorporated and offers a -65°C minimum operating temperature compared to -55°C for the onsemi parts. All three maintain the 3.6 V Zener voltage and SOD-123 package. DDZ9685-7 specifies reverse leakage at 2 V, while MMSZ3V6T1G specifies it at 1 V; both values are within acceptable ranges for this device category.

Q: Why is BZT52C3V6-HE3-08 listed as Obsolete?

A: BZT52C3V6-HE3-08 carries an Obsolete product status designation. This part is included in the substitute list for reference only. Obsolete parts may have limited availability and should not be selected for new designs unless automotive qualification per AEC-Q101 is a mandatory requirement and supply can be confirmed.

Q: Can I use a 500 mW rated substitute in place of the 410 mW primary part?

A: Yes. The 500 mW power rating of DDZ9685-7, MMSZ3V6T1G, and MMSZ4685T1G exceeds the 410 mW specification of the primary part. Higher power ratings provide equivalent or improved thermal performance and are acceptable substitutes from a power dissipation standpoint.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts—BZT52C3V6-HE3-08, DDZ9685-7, MMSZ3V6T1G, and MMSZ4685T1G—are ROHS3 compliant and REACH Unaffected, matching the regulatory status of the primary BZT52B3V6-TP part.

Q: What packaging formats are available for these substitutes?

A: The primary part BZT52B3V6-TP is supplied in Tape & Reel (TR) format. BZT52C3V6-HE3-08 is available in Cut Tape (CT) and Digi-Reel format. DDZ9685-7 is supplied in Tape & Reel (TR). MMSZ3V6T1G and MMSZ4685T1G are available in Cut Tape (CT) and Digi-Reel format. Packaging format selection depends on assembly process requirements and volume specifications.

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