BZT52B15-TP Equivalent & Substitute Parts

Part Overview

The BZT52B15-TP is a 15 V Zener diode manufactured by Micro Commercial Co, rated at 410 mW maximum power dissipation in a surface mount SOD-123 package. This component is currently in active product status with 938 units in stock. The BZT52B15-TP is specified with ±2% voltage tolerance and operates across a temperature range of -55°C to 175°C.

Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required, or when design specifications permit operation within the electrical parameters of equivalent devices. The substitute parts listed maintain the core 15 V nominal Zener voltage and SOD-123 package format while offering variations in power rating, tolerance, and operating temperature ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±2%	—
Power - Max	410	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 11 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 175	°C
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BZT52B15-TP is determined by the following critical parameters:

Primary Matching Criteria:

Nominal Zener voltage of 15 V
Surface mount SOD-123 package format
RoHS3 compliance
Operating temperature range compatibility with application requirements

Secondary Compatibility Factors:

Power dissipation rating (minimum 410 mW for direct replacement; higher ratings acceptable)
Voltage tolerance (±2% preferred; ±5% acceptable for less stringent applications)
Impedance characteristics (30 Ohms maximum for primary part)
Reverse leakage current specifications

All substitute parts maintain the 15 V nominal Zener voltage and SOD-123 package. Variations exist in power rating (410 mW vs. 500 mW), voltage tolerance (±2% vs. ±5%), impedance (16 Ohms to 30 Ohms), and operating temperature ranges (-55°C to 175°C vs. -55°C to 150°C or -65°C to 150°C).

Parameter Comparison

Parameter	BZT52B15-TP (Main)	BZT52B15-HE3-08	MMSZ4702T1G	MMSZ5245ET1G
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	onsemi	onsemi
Voltage - Zener (Nom)	15 V	15 V	15 V	15 V
Tolerance	±2%	±2%	±5%	±5%
Power - Max	410 mW	410 mW	500 mW	500 mW
Impedance (Max)	30 Ohms	30 Ohms	—	16 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 11 V	100 nA @ 11 V	50 nA @ 11.4 V	100 nA @ 11 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	—	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-55 to 175°C	-65 to 150°C	-55 to 150°C	-55 to 150°C
Package / Case	SOD-123	SOD-123	SOD-123	SOD-123
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

BZT52B15-HE3-08 (Vishay General Semiconductor)

This part provides electrical equivalence to the BZT52B15-TP with identical voltage tolerance (±2%), power rating (410 mW), and impedance (30 Ohms). However, the BZT52B15-HE3-08 is classified as obsolete product status. Selection of this part is appropriate only when existing inventory is available and design requirements do not mandate active product status. The operating temperature range is -65°C to 150°C, which is narrower at the upper limit (150°C vs. 175°C). The part carries AEC-Q101 automotive qualification and Moisture Sensitivity Level 1 (Unlimited).

MMSZ4702T1G (onsemi)

This part maintains the 15 V nominal Zener voltage and SOD-123 package with active product status. The power rating is increased to 500 mW, providing additional thermal margin. Voltage tolerance is ±5%, which is wider than the primary part. Operating temperature range is -55°C to 150°C. This part is suitable for applications where the ±5% tolerance is acceptable and the upper operating temperature limit of 150°C is sufficient. Reverse leakage current is reduced to 50 nA at 11.4 V.

MMSZ5245ET1G (onsemi)

This part is functionally equivalent to MMSZ4702T1G with identical electrical specifications: 15 V nominal voltage, ±5% tolerance, 500 mW power rating, and -55°C to 150°C operating temperature. The key distinction is the lower impedance of 16 Ohms (compared to 30 Ohms in the primary part), which may provide improved voltage regulation characteristics. This part is supplied in Tape & Reel packaging, matching the primary part format. Active product status and ROHS3 compliance are confirmed.

Frequently Asked Questions (FAQ)

Q: Can MMSZ4702T1G or MMSZ5245ET1G be used as direct replacements for BZT52B15-TP?

A: Both onsemi parts maintain the 15 V nominal Zener voltage and SOD-123 package, enabling direct physical substitution. The ±5% voltage tolerance is wider than the ±2% specification of the primary part. The 500 mW power rating exceeds the 410 mW requirement. Applications requiring the tighter ±2% tolerance must evaluate whether the ±5% specification is acceptable for circuit performance.

Q: What is the significance of the operating temperature range difference between BZT52B15-TP (-55°C to 175°C) and the substitute parts (-55°C to 150°C)?

A: The primary part supports operation at junction temperatures up to 175°C, while the onsemi substitutes are rated to 150°C maximum. Applications operating near the upper temperature limit require confirmation that the substitute part's 150°C maximum is compatible with the thermal environment. The BZT52B15-HE3-08 operates to 150°C and the primary part to 175°C, representing a 25°C difference.

Q: Why does BZT52B15-HE3-08 show obsolete product status?

A: Obsolete status indicates the part is no longer in active production. While existing inventory may be available (3592 units reported), new production orders cannot be placed. For new designs or long-term supply requirements, active status parts such as MMSZ4702T1G or MMSZ5245ET1G are preferred.

Q: What is the difference between impedance values of 30 Ohms (BZT52B15-TP) and 16 Ohms (MMSZ5245ET1G)?

A: Impedance (Zzt) represents the dynamic resistance of the Zener diode in the reverse breakdown region. Lower impedance (16 Ohms) provides better voltage regulation and lower output impedance under load changes. The 30 Ohms specification of the primary part is acceptable for most applications; the 16 Ohms of MMSZ5245ET1G offers improved performance in voltage regulation circuits.

Q: Are packaging format differences between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® significant?

A: Packaging format affects handling and assembly processes but not electrical performance. Tape & Reel (TR) is standard for high-volume automated assembly. Cut Tape (CT) & Digi-Reel® formats are suitable for lower-volume or mixed-component assembly. Selection depends on manufacturing process requirements, not circuit functionality.

Q: Can the reverse leakage current difference (100 nA vs. 50 nA) affect circuit performance?

A: Reverse leakage current is typically negligible in most applications. The MMSZ4702T1G specification of 50 nA at 11.4 V is lower than the 100 nA at 11 V of the primary part, representing improved leakage characteristics. For high-impedance circuits or precision applications, the lower leakage may provide marginal benefits.

Q: Is RoHS3 compliance maintained across all substitute parts?

A: Yes. All listed substitute parts (BZT52B15-HE3-08, MMSZ4702T1G, and MMSZ5245ET1G) are ROHS3 compliant, matching the primary part specification. REACH status is unaffected for all parts.

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