BZX84C47-TP Equivalent & Substitute Parts

Part Overview

The BZX84C47-TP is an active-status Zener diode manufactured by Micro Commercial Co, rated at 47 V nominal Zener voltage with 350 mW maximum power dissipation in a surface-mount SOT-23 package. This component is used in voltage regulation and protection circuits where precise voltage clamping at 47 V is required. Substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the SOT-23 package family, allowing for component sourcing flexibility while maintaining circuit performance within specified tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	47	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	170	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 32.9 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 175	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of Zener diodes is determined by equivalence in the following critical parameters: nominal Zener voltage (Vz), voltage tolerance, maximum power dissipation (Pmax), impedance (Zzt), reverse leakage current, and package type. All identified substitute parts maintain the 47 V nominal Zener voltage specification with compatible SOT-23 surface-mount packaging. Substitutes are grouped based on power rating capability and impedance characteristics, which directly affect circuit performance in voltage regulation and transient protection applications.

Key substitution criteria:

Nominal Zener voltage: 47 V (all substitutes match)
Package compatibility: SOT-23-3 / TO-236-3 (all substitutes match)
Voltage tolerance: ±5% to ±6% (acceptable range)
Power dissipation: 225 mW to 350 mW (application-dependent selection)
Impedance: 105 to 170 Ohms (affects circuit response)
Operating temperature range: -55°C to 175°C (main part); -55°C to 150°C or -65°C to 150°C (substitutes)

Parameter Comparison

Parameter	BZX84C47-TP (Main)	BZX84C47-E3-08	BZX84C47LT1G	MMBZ5261BLT1G
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	onsemi	onsemi
Voltage - Zener (Nom)	47 V	47 V	47 V	47 V
Tolerance	±5%	±5%	±6%	±5%
Power - Max	350 mW	300 mW	225 mW	225 mW
Impedance (Max)	170 Ohms	170 Ohms	170 Ohms	105 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 32.9 V	50 nA @ 32.9 V	50 nA @ 32.9 V	100 nA @ 36 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA	Not specified	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-55 to 175°C	-55 to 150°C	-65 to 150°C	-65 to 150°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All identified substitute parts are active-status components with ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the main part BZX84C47-TP.

BZX84C47-E3-08 (Vishay): Suitable for applications where 300 mW power dissipation is sufficient. Maintains 170 Ohms impedance and ±5% tolerance matching the main part. Operating temperature range extends to 150°C, which is 25°C lower than the main part's maximum.

BZX84C47LT1G (onsemi): Applicable in circuits tolerating 225 mW power dissipation. Impedance remains at 170 Ohms. Tolerance specification is ±6%, representing a 1% wider tolerance band than the main part. Extended lower operating temperature limit of -65°C provides advantage in cold-environment applications.

MMBZ5261BLT1G (onsemi): Suitable for 225 mW power dissipation applications. Impedance is reduced to 105 Ohms, providing lower dynamic impedance and improved transient response characteristics. Maintains ±5% tolerance. Extended lower operating temperature limit of -65°C matches BZX84C47LT1G.

Selection between substitutes depends on circuit power dissipation requirements, impedance specifications, and operating temperature constraints. The main part BZX84C47-TP offers the highest power rating (350 mW) and widest operating temperature range (-55°C to 175°C).

Frequently Asked Questions (FAQ)

Q: Can BZX84C47-E3-08 replace BZX84C47-TP in all applications?

A: BZX84C47-E3-08 is suitable where circuit power dissipation does not exceed 300 mW. The 50 mW reduction in maximum power rating and 25°C lower upper operating temperature limit must be evaluated against application requirements. Both parts maintain identical 47 V nominal voltage, ±5% tolerance, and 170 Ohms impedance.

Q: What is the difference between BZX84C47LT1G and MMBZ5261BLT1G?

A: Both parts are rated for 225 mW maximum power dissipation and share the same operating temperature range (-65°C to 150°C). The primary difference is impedance: BZX84C47LT1G has 170 Ohms maximum impedance, while MMBZ5261BLT1G has 105 Ohms maximum impedance. Lower impedance in MMBZ5261BLT1G results in faster transient response. BZX84C47LT1G has ±6% tolerance versus ±5% for MMBZ5261BLT1G.

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

A: Yes. All substitute parts use TO-236-3, SC-59, or SOT-23-3 package designations, which are mechanically and electrically equivalent surface-mount packages. PCB footprints and reflow soldering profiles are compatible across all listed parts.

Q: What is the impact of operating temperature range differences?

A: The main part BZX84C47-TP operates to 175°C maximum junction temperature, while all substitutes are limited to 150°C maximum. Applications requiring operation above 150°C require the main part. Conversely, BZX84C47LT1G and MMBZ5261BLT1G extend the lower temperature limit to -65°C, providing advantage in extreme cold environments where the main part is limited to -55°C.

Q: How does impedance affect circuit performance?

A: Impedance (Zzt) determines the dynamic resistance of the Zener diode during transient voltage changes. Lower impedance (MMBZ5261BLT1G at 105 Ohms) provides faster voltage regulation response and lower output impedance. Higher impedance (170 Ohms in main part and two substitutes) results in slower transient response but may be acceptable in applications with slower voltage change rates.

Q: Can I use a lower power-rated substitute in a high-power application?

A: No. Substituting a 225 mW part for a 350 mW application will result in excessive junction temperature and potential device failure. Power dissipation must be calculated for the specific application circuit, and the selected part must have a maximum power rating equal to or greater than the calculated dissipation.

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