BZX84C75LT3 Equivalent & Substitute Parts

Part Overview

The BZX84C75LT3 is a Zener diode rated at 75 V nominal voltage with 225 mW maximum power dissipation, manufactured by onsemi in a surface mount SOT-23-3 (TO-236) package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement.

The BZX84C75LT3 operates across a temperature range of -65°C to 150°C (TJ) with ±6% voltage tolerance and is RoHS non-compliant. Due to its obsolete status, active equivalent parts from onsemi and alternative manufacturers must be evaluated for direct substitution in new designs and legacy system maintenance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	75	V
Tolerance	±6%	-
Power - Max	225	mW
Impedance (Max)	255	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 52.5 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C (TJ)
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-

Substitute Part Grouping Explanation

Substitution of the BZX84C75LT3 is determined by the following critical parameters:

Electrical Parameters (Must Match):

Voltage - Zener (Nom): 75 V
Impedance (Max): 255 Ohms
Current - Reverse Leakage @ Vr: 50 nA @ 52.5 V
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA
Operating Temperature Range: -65°C to 150°C (TJ)

Mechanical Parameters (Must Match):

Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, SOT-23-3

Tolerance Consideration: The BZX84C75LT3 specifies ±6% voltage tolerance. Substitute parts with equal or tighter tolerance (±5%, ±2%, ±1%) are electrically compatible and provide equivalent or superior performance.

Power Dissipation: The BZX84C75LT3 is rated at 225 mW maximum power. Substitute parts rated at 225 mW or higher (250 mW) are acceptable for direct substitution.

Compliance and Status: Active substitute parts are preferred over obsolete components. RoHS3 compliance and AEC-Q101 automotive qualification are available in substitute options but are not required for functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status	RoHS
BZX84C75LT3	onsemi	75 V	±6%	225 mW	255 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Obsolete	Non-compliant
BZX84C75LT1G	onsemi	75 V	±6%	225 mW	255 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
SZBZX84C75ET1G	onsemi	75 V	±6%	225 mW	255 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
SZBZX84C75LT1G	onsemi	75 V	±6%	225 mW	255 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84-C75,235	Nexperia USA Inc.	75 V	±5%	250 mW	255 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84-A75,215	Nexperia USA Inc.	75 V	±1%	250 mW	255 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84-B75,215	NXP Semiconductors	75 V	±2%	250 mW	255 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84-C75,215	NXP Semiconductors	75 V	±5%	250 mW	255 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BZX84C75LT1G (onsemi)

The BZX84C75LT1G is the direct active equivalent from the original manufacturer onsemi. It maintains identical electrical specifications to the BZX84C75LT3 (75 V nominal, ±6% tolerance, 225 mW power, 255 Ω impedance) while offering active product status and ROHS3 compliance. This part is the preferred choice for direct substitution in legacy designs requiring the original onsemi part family.

Secondary Recommendation: SZBZX84C75LT1G (onsemi)

The SZBZX84C75LT1G is an automotive-grade equivalent from onsemi with AEC-Q101 qualification. It provides identical electrical performance to the BZX84C75LT3 with enhanced reliability for automotive applications. This part is suitable for designs requiring automotive-grade components or enhanced qualification documentation.

Alternative Recommendation: SZBZX84C75ET1G (onsemi)

The SZBZX84C75ET1G is an automotive-grade onsemi part with AEC-Q101 qualification and identical electrical specifications. It provides an alternative within the onsemi product family for applications requiring automotive qualification.

Cross-Manufacturer Alternatives: Nexperia / NXP Semiconductors

The BZX84-C75,235 (Nexperia), BZX84-A75,215 (Nexperia), BZX84-B75,215 (NXP), and BZX84-C75,215 (NXP) are functionally equivalent parts with identical 75 V nominal voltage, 255 Ω impedance, and operating temperature range. These parts feature higher power ratings (250 mW versus 225 mW) and tighter voltage tolerances (±5%, ±2%, ±1% versus ±6%), providing superior performance margins. All cross-manufacturer alternatives are active, ROHS3 compliant, and AEC-Q101 qualified.

Compliance Consideration:

The BZX84C75LT3 is RoHS non-compliant. All recommended substitute parts are ROHS3 compliant, supporting transition to current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the BZX84C75LT1G directly replace the BZX84C75LT3?

A: Yes. The BZX84C75LT1G is the direct active equivalent from onsemi with identical electrical specifications (75 V nominal, ±6% tolerance, 225 mW power, 255 Ω impedance) and identical SOT-23-3 package. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: What is the difference between onsemi and Nexperia/NXP substitute parts?

A: All substitute parts maintain the same 75 V nominal voltage, 255 Ω impedance, and SOT-23-3 package. Nexperia and NXP alternatives offer higher power ratings (250 mW versus 225 mW) and tighter voltage tolerances (±5%, ±2%, ±1% versus ±6%). These differences provide superior performance margins but do not affect functional compatibility.

Q: Are automotive-grade parts (SZBZX84C75LT1G, SZBZX84C75ET1G) required for non-automotive applications?

A: No. Automotive-grade parts with AEC-Q101 qualification are not required for non-automotive applications. The standard onsemi BZX84C75LT1G is sufficient for general-purpose applications. Automotive-grade parts are specified only when automotive qualification is a design requirement.

Q: Can I use a substitute part with tighter voltage tolerance (±1%, ±2%, ±5%) in place of the ±6% BZX84C75LT3?

A: Yes. Substitute parts with tighter voltage tolerance are electrically compatible and provide superior performance. A ±1% tolerance part (BZX84-A75,215) provides tighter voltage regulation than the original ±6% specification.

Q: What is the significance of the higher power rating (250 mW) in substitute parts?

A: Substitute parts rated at 250 mW (versus the original 225 mW) provide additional thermal margin and are suitable for applications with higher power dissipation requirements. This higher rating does not affect compatibility with designs using the original 225 mW part.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: Yes. All substitute parts listed are available in SOT-23-3 (TO-236-3, SC-59) surface mount package, ensuring mechanical and footprint compatibility with the original BZX84C75LT3.

Q: What is the difference between BZX84-C75,235 and BZX84-C75,215?

A: Both parts are 75 V Zener diodes with ±5% tolerance and 250 mW power rating. The BZX84-C75,235 is manufactured by Nexperia USA Inc. in Tape & Reel packaging, while the BZX84-C75,215 is manufactured by NXP Semiconductors in Bulk packaging. Electrical specifications are identical.

Q: Is RoHS compliance a functional requirement for substitution?

A: RoHS compliance is a regulatory and procurement requirement, not a functional electrical requirement. The BZX84C75LT3 is RoHS non-compliant, while all active substitute parts are ROHS3 compliant. For new designs and procurement, ROHS3 compliant parts are required to meet current regulatory standards.

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