BZX84C47-7 Equivalent & Substitute Parts

Part Overview

The BZX84C47-7 is a 47V Zener diode manufactured by Diodes Incorporated, rated at 350 mW in a SOT-23-3 surface mount package. This component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). The BZX84C47-7 serves as a voltage regulation and protection element in electronic circuits requiring 47V reference voltage stabilization.

Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within the electrical and mechanical tolerances of alternative manufacturers' offerings. All substitute parts listed maintain the core 47V nominal Zener voltage and SOT-23-3 package compatibility while operating within specified electrical parameters.

Key Parameters

Parameter	BZX84C47-7 Specification
Voltage - Zener (Nom) (Vz)	47 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)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the BZX84C47-7 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 47 V (exact match required)
Package / Case: TO-236-3, SC-59, SOT-23-3 (mechanical compatibility)
Mounting Type: Surface Mount (assembly process compatibility)
Operating Temperature Range: Minimum -65°C to 150°C coverage
RoHS Status: ROHS3 Compliant (regulatory requirement)
Moisture Sensitivity Level: MSL 1 (unlimited shelf life)

Secondary Electrical Parameters (within acceptable variance):

Power - Max: 225 mW to 350 mW (functional tolerance)
Tolerance: ±5% to ±6% (voltage accuracy)
Impedance (Max) (Zzt): 105 Ohms to 170 Ohms (dynamic resistance)
Current - Reverse Leakage @ Vr: 50 nA to 100 nA (leakage current)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (forward bias characteristic)

All substitute parts maintain the 47V nominal Zener voltage and SOT-23-3 package footprint. Variations in power dissipation rating (225 mW to 350 mW) and impedance characteristics are acceptable within the electrical design envelope of circuits originally specified for the BZX84C47-7.

Parameter Comparison

Part Number	Manufacturer	Voltage - Zener (Nom) (Vz)	Power - Max	Tolerance	Impedance (Max) (Zzt)	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Product Status	RoHS Status
BZX84C47-7	Diodes Incorporated	47 V	350 mW	Not specified	Not specified	Not specified	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84C47-7-F	Diodes Incorporated	47 V	300 mW	±6%	170 Ohms	100 nA @ 32.9 V	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84-C47,215	Nexperia USA Inc.	47 V	250 mW	±5%	170 Ohms	50 nA @ 32.9 V	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84-C47,235	NXP USA Inc.	47 V	250 mW	±5%	170 Ohms	50 nA @ 32.9 V	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
BZX84C47LT1G	onsemi	47 V	225 mW	±6%	170 Ohms	50 nA @ 32.9 V	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
CMPZ5261B TR PBFREE	Central Semiconductor Corp	47 V	350 mW	±5%	105 Ohms	100 nA @ 36 V	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
MMBZ5261BLT1G	onsemi	47 V	225 mW	±5%	105 Ohms	100 nA @ 36 V	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
MMBZ5261ELT1G	onsemi	47 V	225 mW	±5%	105 Ohms	100 nA @ 36 V	-55°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
SZBZX84C47ET1G	onsemi	47 V	225 mW	±6%	170 Ohms	50 nA @ 32.9 V	-65°C ~ 150°C	SOT-23-3	Obsolete	ROHS3 Compliant
SZBZX84C47LT1G	onsemi	47 V	225 mW	±6%	170 Ohms	50 nA @ 32.9 V	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant
SZBZX84C47LT3G	onsemi	47 V	225 mW	±6%	170 Ohms	50 nA @ 32.9 V	-65°C ~ 150°C	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Preferred)

BZX84C47-7-F (Diodes Incorporated) and BZX84-C47,215 (Nexperia USA Inc.) are the primary substitutes. Both maintain Active product status, ROHS3 compliance, and identical operating temperature range (-65°C to 150°C). BZX84C47-7-F offers 300 mW power rating, providing closer performance alignment to the original 350 mW specification. BZX84-C47,215 provides 250 mW with automotive-grade qualification (AEC-Q101), suitable for applications requiring automotive reliability standards.

Tier 2 - Functional Substitutes (Secondary Options)

BZX84C47LT1G (onsemi), SZBZX84C47LT1G (onsemi), and SZBZX84C47LT3G (onsemi) are Active products with full temperature range coverage and ROHS3 compliance. These parts operate at 225 mW power dissipation, which is acceptable for circuits designed within the 47V Zener voltage specification. SZBZX84C47LT1G and SZBZX84C47LT3G carry automotive-grade qualification (AEC-Q101).

Tier 3 - Alternative Electrical Characteristics

CMPZ5261B TR PBFREE (Central Semiconductor Corp) and MMBZ5261BLT1G (onsemi) maintain 47V Zener voltage and 350 mW / 225 mW power ratings respectively, but feature lower impedance (105 Ohms versus 170 Ohms). These parts are suitable for applications where lower dynamic resistance is beneficial. MMBZ5261ELT1G operates at reduced minimum temperature (-55°C versus -65°C), limiting use to applications not requiring full low-temperature performance.

Parts to Avoid

SZBZX84C47ET1G carries Obsolete product status and should not be selected for new designs or long-term supply requirements.

Frequently Asked Questions (FAQ)

Q: Can BZX84C47-7 be replaced with a lower power-rated substitute such as BZX84C47LT1G (225 mW)?

A: Yes. The BZX84C47LT1G operates at 225 mW, which is lower than the original 350 mW rating. This substitution is valid when circuit design analysis confirms that the actual power dissipation in the Zener diode does not exceed 225 mW during normal operation. The 47V nominal Zener voltage and SOT-23-3 package remain identical.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts listed use the SOT-23-3 package (also designated TO-236-3 or SC-59), which maintains identical pin configuration and PCB footprint compatibility with the BZX84C47-7.

Q: What is the difference between ±5% and ±6% tolerance specifications?

A: Tolerance refers to the allowable deviation of the Zener voltage from the nominal 47V specification. ±5% tolerance permits voltage variation between 44.65V and 49.35V, while ±6% tolerance permits variation between 44.18V and 49.82V. Both tolerances are acceptable for general voltage regulation applications. Applications requiring tighter voltage accuracy should specify ±5% parts.

Q: Why do some substitutes have lower impedance (105 Ohms) compared to the original (170 Ohms)?

A: Impedance (Zzt) represents the dynamic resistance of the Zener diode at the test current. Lower impedance indicates better voltage regulation characteristics and reduced output impedance. Parts with 105 Ohms impedance (CMPZ5261B, MMBZ5261 series) provide superior voltage stability but are functionally equivalent for 47V Zener applications.

Q: Can MMBZ5261ELT1G be used in applications requiring -65°C operation?

A: No. MMBZ5261ELT1G specifies a minimum operating temperature of -55°C, which does not cover the full -65°C to 150°C range of the original BZX84C47-7. This part is suitable only for applications with minimum operating temperature of -55°C or higher.

Q: What is the significance of automotive-grade qualification (AEC-Q101)?

A: AEC-Q101 qualification indicates that the component meets automotive industry reliability and quality standards established by the Automotive Electronics Council. Parts carrying this qualification (BZX84-C47,215, SZBZX84C47LT1G, SZBZX84C47LT3G) are suitable for automotive and mission-critical applications requiring enhanced reliability documentation.

Q: Should SZBZX84C47ET1G be considered as a substitute?

A: No. SZBZX84C47ET1G carries Obsolete product status, indicating that the manufacturer has discontinued production. New designs should not incorporate obsolete parts, and existing inventory of this part should be reserved for legacy product support only.

Q: Are there packaging differences between substitute parts?

A: Yes. The original BZX84C47-7 is supplied in Cut Tape (CT) & Digi-Reel® packaging. Substitute parts are available in Cut Tape (CT), Tape & Reel (TR), or Bulk packaging. Packaging selection should align with manufacturing volume and assembly process requirements. All packaging formats contain identical electrical components in the SOT-23-3 package.

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