BZT52B43-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The BZT52B43-TP is a 43 V, 410 mW surface mount Zener diode manufactured by Micro Commercial Co in SOD-123 package. This component is classified as Active and maintains full RoHS3 compliance. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits. Substitute parts become necessary due to inventory availability, lead time constraints, or specific application requirements such as automotive qualification or enhanced power dissipation capability.

Substiute Parts

BZT52B43-TP

Micro Commercial CoIn Stock: 967BZT52B43-TP Datasheet

Current PartRFQ

SZMMSZ43T1G

onsemiIn Stock: 8037SZMMSZ43T1G Datasheet

SimilarRFQ

SZMMSZ5260BT1G

onsemiIn Stock: 65197SZMMSZ5260BT1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZT52B43-TP is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage (Vz) must equal 43 V nominal
• Package must be SOD-123 surface mount
• Operating temperature range must encompass the application requirement
• RoHS3 compliance must be maintained

Secondary Compatibility Factors:

• Power dissipation (Pmax) of substitute must equal or exceed 410 mW
• Impedance (Zzt) and tolerance variations are acceptable within application circuit design margins
• Forward voltage (Vf) characteristics must remain consistent at specified test conditions

The substitute parts SZMMSZ43T1G and SZMMSZ5260BT1G both meet the primary substitution criteria with identical 43 V Zener voltage and SOD-123 packaging. Both substitutes provide enhanced power dissipation (500 mW) compared to the original specification.

Parameter Comparison

Engineering Selection Recommendations

BZT52B43-TP (Original): Select this part when ±2% tolerance is a circuit design requirement and operating temperature must reach 175°C. This part maintains the tightest tolerance specification among the three options.

SZMMSZ43T1G (Substitute): This onsemi part is suitable for applications requiring AEC-Q101 automotive qualification. The 500 mW power rating provides margin above the original 410 mW specification. The ±5% tolerance is acceptable for most voltage regulation applications. Operating temperature is limited to 150°C. Packaging is Tape & Reel (TR).

SZMMSZ5260BT1G (Substitute): This onsemi part offers the lowest impedance (93 Ohms) among the three options and maintains AEC-Q101 automotive qualification. The 500 mW power rating and ±5% tolerance match SZMMSZ43T1G. Operating temperature is limited to 150°C. Packaging is Cut Tape (CT) & Digi-Reel®, providing alternative supply chain options.

All three parts maintain RoHS3 compliance and REACH Unaffected status. Selection between substitutes depends on tolerance requirements, temperature operating range, packaging format preference, and automotive qualification necessity.

Frequently Asked Questions (FAQ)

Q: Can SZMMSZ43T1G or SZMMSZ5260BT1G be used as direct replacements for BZT52B43-TP?

A: Both onsemi parts are functionally compatible as substitutes. The 43 V Zener voltage, SOD-123 package, and surface mount configuration are identical. The primary differences are tolerance (±5% vs. ±2%), maximum operating temperature (150°C vs. 175°C), and power dissipation (500 mW vs. 410 mW). Substitution is valid when the application circuit can tolerate ±5% voltage variation and does not require operation above 150°C.

Q: What is the difference between SZMMSZ43T1G and SZMMSZ5260BT1G?

A: Both parts share identical Zener voltage (43 V), power rating (500 mW), tolerance (±5%), and operating temperature range (-55°C to 150°C). The key differences are impedance (150 Ohms vs. 93 Ohms), reverse leakage current specifications, and packaging format. SZMMSZ43T1G uses Tape & Reel packaging, while SZMMSZ5260BT1G uses Cut Tape & Digi-Reel® packaging. The lower impedance of SZMMSZ5260BT1G may provide superior performance in high-frequency applications.

Q: Is automotive qualification required for my application?

A: The BZT52B43-TP does not carry automotive qualification. Both onsemi substitutes (SZMMSZ43T1G and SZMMSZ5260BT1G) are AEC-Q101 qualified. If your application requires automotive-grade components, either onsemi substitute is appropriate. If automotive qualification is not required, the original BZT52B43-TP remains valid.

Q: Why does the BZT52B43-TP have a higher maximum operating temperature than the substitutes?

A: The BZT52B43-TP operates to 175°C, while both onsemi substitutes are rated to 150°C. This is a manufacturer specification difference. If your circuit requires operation above 150°C, the original BZT52B43-TP must be used. For applications with maximum operating temperature at or below 150°C, the substitutes are fully compatible.

Q: What does the ±2% tolerance on BZT52B43-TP mean compared to ±5% on the substitutes?

A: Tolerance specifies the allowable deviation from the nominal 43 V Zener voltage. The BZT52B43-TP guarantees the Zener voltage will be between 42.14 V and 43.86 V. The onsemi substitutes guarantee between 40.85 V and 45.15 V. For precision voltage reference applications, the ±2% tolerance of BZT52B43-TP is preferred. For general voltage regulation and protection circuits, ±5% tolerance is typically acceptable.

Q: Can I use these parts interchangeably in my PCB design?

A: Yes, all three parts use identical SOD-123 surface mount packaging and pinout. No PCB layout modifications are required for substitution. However, circuit performance may vary slightly due to impedance and tolerance differences. Verify that your circuit design margins accommodate the ±5% tolerance and 93–150 Ohm impedance range of the substitutes.