BZT52C39-13 Equivalent & Substitute Parts

Part Overview

The BZT52C39-13 is a Zener diode rated at 39 V nominal voltage with 500 mW power dissipation in a surface mount SOD-123 package. Manufactured by Diodes Incorporated, this component is classified as discontinued at DiGi Electronics, with RoHS non-compliant status. The discontinuation of this part number necessitates identification of equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	39	V
Tolerance	±5	%
Power - Maximum	500	mW
Impedance (Maximum)	130	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 27.3 V
Voltage - Forward (Maximum) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—

Substitute Part Grouping Explanation

Substitution of the BZT52C39-13 is determined by the following critical parameters: nominal Zener voltage (39 V), voltage tolerance (±5%), maximum power dissipation (500 mW), package type (SOD-123), and mounting configuration (surface mount). Components meeting these core electrical and mechanical specifications are classified as direct equivalents. Variations in impedance, reverse leakage current, and forward voltage within the specified tolerances do not preclude substitution. Compliance status (RoHS3 compliance) and product status (active vs. discontinued) are secondary considerations that influence selection priority but do not affect electrical compatibility.

The substitute parts are organized into the following categories:

Direct Manufacturer Equivalent: Parts with identical electrical specifications and active product status from the original manufacturer.

Manufacturer Recommended Equivalent: Parts from alternative manufacturers meeting all core electrical parameters with active status and RoHS3 compliance.

Parametric Equivalent: Parts with matching core specifications but different packaging formats (tape & reel vs. cut tape).

Upgrade Consideration: Parts with reduced power rating (200 mW vs. 500 mW) suitable only for applications with lower power requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance (%)	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Package	RoHS Status	Product Status
BZT52C39-13	Diodes Incorporated	39	±5	500	130	100 @ 27.3	900 @ 10	-65 to 150	SOD-123	Non-compliant	Discontinued
BZT52C39-13-F	Diodes Incorporated	39	±5	500	130	100 @ 27.3	900 @ 10	-65 to 150	SOD-123	ROHS3 Compliant	Active
MMSZ5259B-7-F	Diodes Incorporated	39	±5	500	80	100 @ 30	900 @ 10	-65 to 150	SOD-123	ROHS3 Compliant	Active
BZT52C39-7-F	Diodes Incorporated	39	±5	500	130	100 @ 27.3	900 @ 10	-65 to 150	SOD-123	ROHS3 Compliant	Active
BZT52C39-TP	Micro Commercial Co	39	±5	200	130	100 @ 27.3	900 @ 10	-65 to 150	SOD-123	ROHS3 Compliant	Active
CMHZ5259B TR PBFREE	Central Semiconductor Corp	39	±5	500	80	100 @ 30	900 @ 10	-65 to 150	SOD-123	ROHS3 Compliant	Active
MMSZ39T1G	onsemi	39	±5	500	130	50 @ 27.3	900 @ 10	-55 to 150	SOD-123	ROHS3 Compliant	Active
SZMMSZ39T1G	onsemi	39	±5	500	130	50 @ 27.3	900 @ 10	-55 to 150	SOD-123	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Selection: BZT52C39-13-F is the direct equivalent from the original manufacturer with identical electrical specifications, active product status, and RoHS3 compliance. This part provides the most direct replacement path for the discontinued BZT52C39-13.

Secondary Selection: BZT52C39-7-F offers parametric equivalence with identical electrical characteristics and active status. The difference in packaging format (Cut Tape & Digi-Reel vs. Tape & Reel) does not affect electrical performance and may be selected based on procurement and assembly requirements.

Alternative Selections: MMSZ5259B-7-F and CMHZ5259B TR PBFREE are functionally equivalent with lower impedance specifications (80 Ohms vs. 130 Ohms). These parts maintain all critical electrical parameters and are suitable for applications where impedance variation is acceptable within circuit design tolerances.

Cross-Manufacturer Options: MMSZ39T1G and SZMMSZ39T1G from onsemi provide equivalent performance with improved reverse leakage characteristics (50 nA vs. 100 nA). SZMMSZ39T1G includes automotive qualification (AEC-Q101) and is suitable for automotive applications. The operating temperature range for onsemi parts is -55°C to 150°C, which is acceptable for most applications but does not extend to the lower -65°C limit of the original part.

Not Recommended for Direct Substitution: BZT52C39-TP has reduced power dissipation (200 mW vs. 500 mW) and is suitable only for applications with lower power requirements. This part should not be used as a direct replacement without circuit re-evaluation.

Frequently Asked Questions (FAQ)

Q: Can BZT52C39-13-F be used as a direct replacement for BZT52C39-13?

A: Yes. BZT52C39-13-F is the direct equivalent with identical electrical specifications (39 V, ±5%, 500 mW, SOD-123). The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). Electrical performance is equivalent.

Q: What is the difference between BZT52C39-13-F and MMSZ5259B-7-F?

A: Both parts meet the core specifications (39 V, ±5%, 500 mW, SOD-123). The difference is impedance: BZT52C39-13-F has 130 Ohms maximum impedance, while MMSZ5259B-7-F has 80 Ohms. Lower impedance may provide improved voltage regulation in some applications. Reverse leakage current is also slightly different (100 nA @ 27.3 V vs. 100 nA @ 30 V).

Q: Are onsemi parts (MMSZ39T1G, SZMMSZ39T1G) compatible with the original BZT52C39-13?

A: Yes, with one consideration. Both onsemi parts meet all core electrical specifications and are in SOD-123 packages. However, the operating temperature range is -55°C to 150°C, which does not extend to the -65°C lower limit of the original part. If the application requires operation below -55°C, these parts are not suitable. Reverse leakage current is improved (50 nA vs. 100 nA).

Q: What is the significance of the packaging designation (TR, CT, Digi-Reel)?

A: Packaging designations indicate the physical format for delivery and assembly: Tape & Reel (TR) is standard for automated pick-and-place assembly, Cut Tape (CT) & Digi-Reel is for lower-volume or manual assembly. These designations do not affect electrical performance. Selection depends on manufacturing process and volume requirements.

Q: Can BZT52C39-TP be used instead of BZT52C39-13?

A: BZT52C39-TP is not a direct replacement. While it maintains the 39 V specification and SOD-123 package, power dissipation is reduced to 200 mW (vs. 500 mW). This part is suitable only for applications with lower power requirements. Circuit re-evaluation is required before substitution.

Q: What does RoHS3 compliance mean for this component?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials. All active substitute parts listed are RoHS3 compliant. The original BZT52C39-13 is non-compliant, making RoHS3-compliant alternatives necessary for new designs subject to RoHS regulations.

Q: Is SZMMSZ39T1G suitable for automotive applications?

A: Yes. SZMMSZ39T1G includes automotive qualification (AEC-Q101) and is specifically designed for automotive use. If the application is automotive, this part is the recommended selection among the onsemi options.

Q: How do I choose between multiple equivalent parts?

A: Selection priority: (1) Product status (active preferred), (2) RoHS compliance (ROHS3 required for regulated applications), (3) Manufacturer availability and inventory, (4) Packaging format (based on assembly process), (5) Impedance and leakage specifications (if circuit design requires specific values). BZT52C39-13-F is the recommended first choice for most applications.

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