BZX84C43-7 Equivalent & Substitute Parts

Part Overview

The BZX84C43-7 is a Zener diode manufactured by Diodes Incorporated, rated at 43V nominal voltage with 350mW power dissipation in SOT-23-3 surface mount packaging. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications (voltage rating, power dissipation, tolerance, and thermal characteristics) and mechanical compatibility (package type and mounting configuration). Alternative sources and variants are necessary to support supply chain flexibility, packaging preferences, and application-specific performance requirements.

Key Parameters

Parameter	BZX84C43-7 Value
Voltage - Zener (Nom) (Vz)	43 V
Power - Max	350 mW
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BZX84C43-7 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 43 V (exact match required)
Package / Case: TO-236-3, SC-59, SOT-23-3 (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Operating Temperature Range: -65°C to 150°C minimum (thermal envelope)

Secondary Compatibility Factors:

Power - Max: 350 mW or greater (equal or higher rating acceptable)
Tolerance: ±1% to ±7% (application-dependent)
RoHS Status: ROHS3 Compliant (regulatory requirement)
Moisture Sensitivity Level: 1 (Unlimited) (handling and storage)

Substitute parts are grouped into two categories: Direct Substitutes (identical packaging and power rating from the same manufacturer) and Functional Equivalents (alternative manufacturers with matching voltage and package specifications but varying power ratings and electrical characteristics).

Parameter Comparison

Part Number	Manufacturer	Voltage - Zener (Nom)	Power - Max	Tolerance	Impedance (Max)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Package / Case	RoHS Status
BZX84C43-7	Diodes Incorporated	43 V	350 mW	Not specified	Not specified	Not specified	Not specified	Not specified	SOT-23-3	ROHS3 Compliant
BZX84C43-7-F	Diodes Incorporated	43 V	300 mW	±7%	150 Ohms	100 nA @ 30.1 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	ROHS3 Compliant
BZX84-A43,215	NXP Semiconductors	43 V	250 mW	±1%	150 Ohms	50 nA @ 30.1 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	Not specified
BZX84-C43,215	NXP USA Inc.	43 V	250 mW	±5%	150 Ohms	50 nA @ 30.1 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	ROHS3 Compliant
BZX84C43-TP	Micro Commercial Co	43 V	350 mW	±5%	150 Ohms	100 nA @ 30.1 V	900 mV @ 10 mA	-55°C ~ 150°C	SOT-23-3	ROHS3 Compliant
BZX84C43LT1G	onsemi	43 V	225 mW	±7%	150 Ohms	50 nA @ 30.1 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	ROHS3 Compliant
MMBZ5260BLT1G	onsemi	43 V	225 mW	±5%	93 Ohms	100 nA @ 33 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	ROHS3 Compliant
SZBZX84C43LT1G	onsemi	43 V	225 mW	±7%	150 Ohms	50 nA @ 30.1 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	ROHS3 Compliant
SZMMBZ5260BLT1G	onsemi	43 V	225 mW	±5%	93 Ohms	100 nA @ 33 V	900 mV @ 10 mA	-65°C ~ 150°C	SOT-23-3	ROHS3 Compliant

Engineering Selection Recommendations

Direct Manufacturer Equivalent: BZX84C43-7-F (Diodes Incorporated) is the direct equivalent from the same manufacturer, available in Tape & Reel packaging. This part maintains the 43V nominal voltage and SOT-23-3 package specification. Power rating is 300mW, which is lower than the original 350mW specification. This part is suitable for applications where the reduced power dissipation is acceptable within the circuit design margins.

Highest Power Rating Substitute: BZX84C43-TP (Micro Commercial Co) matches the original 350mW power rating and 43V voltage specification in SOT-23-3 packaging. Operating temperature range is -55°C to 150°C, which is narrower at the lower end compared to the original -65°C specification. This part is suitable for applications operating above -55°C.

Automotive-Qualified Alternatives: BZX84-A43,215 (NXP Semiconductors) and BZX84-C43,215 (NXP USA Inc.) are automotive-grade components with AEC-Q101 qualification. Both maintain 43V voltage and SOT-23-3 packaging with 250mW power rating. The BZX84-A43,215 offers ±1% tolerance, providing tighter voltage regulation. These parts are suitable for automotive and mission-critical applications requiring AEC-Q101 certification.

Lower Power Rating Alternatives: BZX84C43LT1G, MMBZ5260BLT1G, SZBZX84C43LT1G, and SZMMBZ5260BLT1G (all onsemi) provide 225mW power rating in SOT-23-3 packaging. SZBZX84C43LT1G and SZMMBZ5260BLT1G carry automotive-grade qualification with AEC-Q101 certification. These parts are suitable for applications with lower power dissipation requirements or where automotive qualification is mandated.

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and operating temperature range of -65°C to 150°C (except BZX84C43-TP at -55°C minimum).

Frequently Asked Questions (FAQ)

Q: Can BZX84C43-7-F replace BZX84C43-7 directly? A: BZX84C43-7-F is a direct manufacturer equivalent with identical voltage (43V) and package (SOT-23-3) specifications. The power rating is 300mW versus 350mW in the original. Substitution is valid if the circuit design accommodates the lower power dissipation rating.

Q: What is the difference between BZX84C43-TP and BZX84C43-7? A: Both parts share 43V voltage rating, 350mW power rating, and SOT-23-3 packaging. BZX84C43-TP is manufactured by Micro Commercial Co and has an operating temperature range of -55°C to 150°C, compared to the original specification of -65°C to 150°C. Substitution is valid for applications operating above -55°C.

Q: Are NXP BZX84-A43,215 and BZX84-C43,215 suitable for automotive applications? A: Yes. Both NXP parts carry AEC-Q101 automotive qualification and are suitable for automotive and mission-critical applications. BZX84-A43,215 offers ±1% tolerance versus ±5% for BZX84-C43,215. Both have 250mW power rating and 43V voltage specification.

Q: What is the advantage of onsemi SZBZX84C43LT1G and SZMMBZ5260BLT1G? A: Both onsemi parts carry AEC-Q101 automotive qualification. SZBZX84C43LT1G provides 150 Ohms impedance with ±7% tolerance, while SZMMBZ5260BLT1G provides 93 Ohms impedance with ±5% tolerance. Both are rated at 225mW and 43V. Selection depends on impedance requirements and tolerance specifications for the application.

Q: Can lower power-rated parts (225mW) substitute for the 350mW original? A: Lower power-rated parts can substitute only if the circuit design ensures power dissipation remains within the lower rating. The 225mW parts (BZX84C43LT1G, MMBZ5260BLT1G, SZBZX84C43LT1G, SZMMBZ5260BLT1G) are suitable for applications with reduced power requirements or where thermal constraints limit dissipation.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts are ROHS3 compliant. All maintain MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard handling and storage procedures.

Q: What packaging options are available for these substitutes? A: BZX84C43-7-F, BZX84C43-TP, BZX84C43LT1G, MMBZ5260BLT1G, SZBZX84C43LT1G are available in Tape & Reel (TR) packaging. SZMMBZ5260BLT1G is available in Cut Tape (CT) packaging. NXP parts (BZX84-A43,215 and BZX84-C43,215) are available in Bulk packaging. Packaging selection depends on assembly volume and handling requirements.

Q: What is the impedance difference between MMBZ5260BLT1G and BZX84C43LT1G? A: MMBZ5260BLT1G has maximum impedance of 93 Ohms, while BZX84C43LT1G has maximum impedance of 150 Ohms. Lower impedance provides better voltage regulation characteristics. Selection depends on circuit requirements for voltage stability and transient response.

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