TLZ39B-GS08 Equivalent & Substitute Parts

Part Overview

The TLZ39B-GS08 is a Zener diode manufactured by Vishay General Semiconductor - Diodes Division, rated at 39 V nominal Zener voltage with 500 mW maximum power dissipation in a surface mount SOD-80 MiniMELF package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances. The primary substitute identified operates at a closely related Zener voltage with identical power rating and compatible packaging, enabling direct functional replacement in applications where the voltage differential is acceptable within circuit design margins.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Voltage - Zener (Nom)	39	V	Primary electrical specification; determines voltage regulation point
Power - Max	500	mW	Critical thermal rating; must match or exceed application requirements
Impedance (Max)	85	Ohms	Affects voltage stability and transient response
Package / Case	DO-213AC, MINI-MELF, SOD-80	—	Mechanical compatibility with PCB footprint and assembly process
Mounting Type	Surface Mount	—	Assembly method compatibility
Operating Temperature	-65°C ~ 175°C	°C	Defines thermal operating envelope
RoHS Status	ROHS3 Compliant	—	Regulatory compliance requirement
Moisture Sensitivity Level	1 (Unlimited)	—	Handling and storage requirements

Substitute Part Grouping Explanation

Substitution eligibility for the TLZ39B-GS08 is determined by the following criteria:

Electrical Compatibility:

Zener voltage within acceptable circuit tolerance (36 V to 39 V nominal range)
Power dissipation rating equal to or greater than 500 mW
Impedance characteristics compatible with application stability requirements
Operating temperature range encompassing or exceeding -65°C to 175°C

Mechanical Compatibility:

Surface mount package type (SOD-80 / DO-213AC / MiniMELF)
Identical or compatible PCB footprint
Lead-free construction for RoHS compliance

Regulatory Compliance:

RoHS3 compliance status
REACH unaffected classification
Moisture sensitivity level MSL 1 or equivalent

The identified substitute BZV55-B36,115 meets these criteria with a nominal Zener voltage of 36 V (3 V differential from the primary part), matching power rating, compatible package geometry, and equivalent regulatory certifications.

Parameter Comparison

Parameter	TLZ39B-GS08 (Main Part)	BZV55-B36,115 (Substitute)	Compatibility Notes
Manufacturer	Vishay General Semiconductor	NXP Semiconductors	Different manufacturers; both active product status
Voltage - Zener (Nom)	39 V	36 V	3 V differential; circuit design must accommodate voltage tolerance
Tolerance	—	±2%	Substitute specifies tighter tolerance
Power - Max	500 mW	500 mW	Identical thermal rating
Impedance (Max)	85 Ohms	90 Ohms	5 Ohm differential; negligible impact on most applications
Current - Reverse Leakage	40 nA @ 33.6 V	50 nA @ 700 mV	Measured at different reference points; both within low leakage specification
Voltage - Forward (Vf) (Max)	1.5 V @ 200 mA	900 mV @ 10 mA	Measured at different current levels; not directly comparable
Operating Temperature	-65°C ~ 175°C	-65°C ~ 200°C	Substitute offers extended upper temperature range (+25°C)
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	Identical package specifications; direct footprint compatibility
Mounting Type	Surface Mount	Surface Mount	Identical assembly method
RoHS Status	ROHS3 Compliant	ROHS3 Compliant (implied)	Both meet regulatory requirements
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical handling requirements
REACH Status	REACH Unaffected	REACH Unaffected	Both compliant with chemical regulations

Engineering Selection Recommendations

Primary Consideration: Zener Voltage Differential

The substitute part BZV55-B36,115 operates at 36 V nominal Zener voltage compared to the 39 V specification of the TLZ39B-GS08. This 3 V differential (7.7% variance) requires circuit-level evaluation. Selection of this substitute is appropriate only when:

The application circuit design accommodates a 36 V regulation point
System voltage tolerance specifications permit the lower Zener voltage
Load regulation and line regulation performance remain within acceptable margins at the reduced voltage

Thermal Performance

Both parts share identical 500 mW power dissipation ratings. The substitute offers an extended operating temperature range to 200°C (versus 175°C for the main part), providing additional thermal margin in high-temperature applications.

Regulatory and Compliance Status

Both parts maintain Active product status with RoHS3 compliance, REACH unaffected classification, and MSL 1 moisture sensitivity rating. No compliance barriers exist for substitution from a regulatory perspective.

Package and Assembly Compatibility

Identical SOD-80 MiniMELF package specifications ensure direct mechanical compatibility with existing PCB layouts and automated assembly processes. No redesign or rework is required at the board level.

Impedance Characteristics

The 5 Ohm impedance differential (85 Ohms versus 90 Ohms) produces negligible impact on voltage stability and transient response in typical applications.

Frequently Asked Questions (FAQ)

Q: Can the BZV55-B36,115 be used as a direct replacement for the TLZ39B-GS08 without circuit modification?

A: Direct mechanical and thermal replacement is possible due to identical package and power ratings. However, the 3 V Zener voltage difference requires circuit-level verification. Applications with fixed voltage regulation requirements must confirm that 36 V operation meets system specifications. Applications with voltage tolerance bands may accommodate substitution without modification.

Q: What is the significance of the 3 V voltage difference between the two parts?

A: The TLZ39B-GS08 regulates at 39 V nominal while the BZV55-B36,115 regulates at 36 V nominal. In voltage regulation circuits, this difference directly affects the output voltage level. In overvoltage protection circuits, the protection threshold shifts 3 V lower. Circuit design must confirm this voltage shift is acceptable for the intended application.

Q: Are the package dimensions identical between these two parts?

A: Yes. Both parts use the DO-213AC / SOD-80 MiniMELF package specification. PCB footprints, solder pad layouts, and component placement are identical. No board redesign is required for mechanical substitution.

Q: What are the thermal operating range differences?

A: The TLZ39B-GS08 operates from -65°C to 175°C. The BZV55-B36,115 extends the upper limit to 200°C, providing 25°C additional thermal margin. Both share the same lower temperature limit of -65°C. For applications operating near 175°C, the substitute offers improved thermal headroom.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both parts are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity ratings. No compliance barriers exist for substitution. Both maintain Active product status with full manufacturer support.

Q: How do the impedance specifications compare?

A: The TLZ39B-GS08 specifies 85 Ohms maximum impedance while the BZV55-B36,115 specifies 90 Ohms maximum. This 5 Ohm difference produces minimal impact on voltage stability and transient response in typical applications. Both values fall within acceptable ranges for standard Zener diode performance.

Q: What inventory considerations apply to these parts?

A: The TLZ39B-GS08 has 10,300 pieces in stock. The BZV55-B36,115 has 773,458 pieces in stock, representing significantly higher availability. For applications where substitution is electrically acceptable, the substitute offers superior supply chain continuity.

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