MMBZ5247B Equivalent & Substitute Parts

Part Overview

The MMBZ5247B is a Zener diode rated at 17 V nominal voltage with 350 mW maximum power dissipation in a surface mount SOT-23-3 package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The part operates across a temperature range of -55°C to 150°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	17	V
Tolerance	±5	%
Power - Max	350	mW
Impedance (Max)	19	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 13 V	nA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	mV
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5247B is determined by the following critical parameters: nominal Zener voltage (17 V), voltage tolerance (±5%), maximum power dissipation capability, impedance characteristics, reverse leakage current, forward voltage drop, operating temperature range, and surface mount package compatibility (SOT-23-3 or equivalent).

Substitute parts are grouped into two categories:

Direct Functional Equivalents: Parts that maintain the 17 V nominal Zener voltage, ±5% tolerance, and SOT-23-3 package form factor. These parts satisfy the core electrical and mechanical requirements of the original component.

Similar Functional Alternatives: Parts that maintain the 17 V nominal Zener voltage and ±5% tolerance but may differ in maximum power dissipation, package variant (SOT-323), or operating temperature range. These parts are suitable for applications where the specific power rating or package size variation is acceptable within the circuit design constraints.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Status
MMBZ5247B	onsemi	17 V	±5%	350 mW	19 Ω	900 mV @ 10 mA	-55 to 150°C	SOT-23-3	Obsolete
MMBZ5247BLT1G	onsemi	17 V	±5%	225 mW	19 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active
CMPZ5247B BK PBFREE	Central Semiconductor Corp	17 V	±5%	350 mW	19 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active
CMPZ5247B TR PBFREE	Central Semiconductor Corp	17 V	±5%	350 mW	19 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-23-3	Active
MMBZ5247B_R1_00001	Panjit International Inc.	17 V	±5%	410 mW	19 Ω	Not specified	-55 to 150°C	SOT-23-3	Active
MMBZ5246BW-7-F	Diodes Incorporated	16 V	±5%	200 mW	17 Ω	900 mV @ 10 mA	-65 to 150°C	SOT-323	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

CMPZ5247B BK PBFREE and CMPZ5247B TR PBFREE (Central Semiconductor Corp) are the preferred direct substitutes for the obsolete MMBZ5247B. Both parts maintain identical electrical specifications: 17 V nominal Zener voltage, ±5% tolerance, 350 mW maximum power dissipation, 19 Ω maximum impedance, and SOT-23-3 package compatibility. Both are RoHS3 compliant and active products with extended operating temperature range (-65°C to 150°C). The primary distinction between these two parts is packaging format: BK PBFREE is supplied in bulk, while TR PBFREE is supplied in tape and reel format.

Secondary Substitute (Active onsemi Alternative):

MMBZ5247BLT1G (onsemi) is an active product from the original manufacturer with identical voltage and tolerance specifications. This part operates at reduced maximum power dissipation (225 mW versus 350 mW) and features an extended lower operating temperature limit (-65°C versus -55°C). This substitute is suitable for applications where the 225 mW power rating is sufficient and the extended temperature range provides additional design margin.

Alternative Substitute (Higher Power Rating):

MMBZ5247B_R1_00001 (Panjit International Inc.) provides a 17 V nominal Zener diode with increased maximum power dissipation (410 mW) in the SOT-23-3 package. This part is suitable for applications requiring higher power handling capability while maintaining the same voltage regulation characteristics.

Limited Compatibility Alternative:

MMBZ5246BW-7-F (Diodes Incorporated) differs in nominal Zener voltage (16 V versus 17 V) and package format (SOT-323 versus SOT-23-3). This part is AEC-Q101 qualified for automotive applications and is suitable only when a 16 V regulation voltage is acceptable and the smaller SOT-323 package footprint is compatible with the circuit design.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5247BLT1G replace MMBZ5247B in all applications?

A: MMBZ5247BLT1G maintains identical voltage and tolerance specifications but operates at 225 mW maximum power dissipation compared to the original 350 mW rating. Substitution is valid only when the circuit design requires 225 mW or less power dissipation. The extended operating temperature range (-65°C to 150°C) provides additional design margin compared to the original -55°C to 150°C range.

Q: What is the difference between CMPZ5247B BK PBFREE and CMPZ5247B TR PBFREE?

A: Both parts are electrically identical with 17 V nominal voltage, ±5% tolerance, and 350 mW maximum power dissipation in SOT-23-3 package. The distinction is packaging format: BK PBFREE is supplied in bulk packaging, while TR PBFREE is supplied in tape and reel format for automated assembly processes.

Q: Is MMBZ5246BW-7-F a suitable replacement for MMBZ5247B?

A: MMBZ5246BW-7-F differs in two critical parameters: nominal Zener voltage is 16 V (not 17 V) and package format is SOT-323 (not SOT-23-3). This part is suitable only when both the 16 V voltage specification and SOT-323 package footprint are compatible with the circuit design requirements.

Q: Are all substitute parts RoHS3 compliant?

A: CMPZ5247B BK PBFREE, CMPZ5247B TR PBFREE, MMBZ5247BLT1G, MMBZ5247B_R1_00001, and MMBZ5246BW-7-F are all RoHS3 compliant. The original MMBZ5247B does not specify RoHS status.

Q: What is the operating temperature range difference between substitute parts?

A: The original MMBZ5247B operates from -55°C to 150°C. MMBZ5247BLT1G, CMPZ5247B variants, and MMBZ5246BW-7-F all extend the lower temperature limit to -65°C, providing 10°C additional margin at low temperatures. MMBZ5247B_R1_00001 maintains the original -55°C lower limit.

Q: Can MMBZ5247B_R1_00001 be used in place of MMBZ5247B?

A: MMBZ5247B_R1_00001 maintains the 17 V nominal voltage and ±5% tolerance in SOT-23-3 package with increased maximum power dissipation (410 mW versus 350 mW). This part is suitable as a direct replacement and provides additional power handling capability for the same voltage regulation function.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts are REACH Unaffected and classified under ECCN EAR99. MMBZ5246BW-7-F carries additional AEC-Q101 automotive qualification. All parts have Moisture Sensitivity Level 1 (Unlimited).

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