MMBZ5246B-TP Zener Diode 16V 350mW SOT-23 Equivalent & Substitute Parts

Part Overview

The MMBZ5246B-TP is a 16 V zener diode manufactured by Micro Commercial Co, rated for 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is classified as Active and is in current production. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits in electronic systems. Equivalent and substitute parts are identified based on matching nominal zener voltage, package type, mounting configuration, and operating temperature range to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Power - Max	350	mW
Tolerance	±5%
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 12 V
Voltage - Forward (Max) @ If	900 mV @ 10 mA
Operating Temperature	-55 to 150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MMBZ5246B-TP is determined by the following critical parameters:

Primary Matching Criteria:

Nominal zener voltage: 16 V
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Operating temperature range: Minimum -55°C to maximum 150°C

Secondary Compatibility Factors:

Voltage tolerance (±2% to ±6% acceptable within design margin)
Power rating (250 mW to 350 mW acceptable depending on circuit thermal design)
Impedance (17 to 40 Ohms acceptable for most applications)
Reverse leakage current (50 nA to 100 nA acceptable)
Forward voltage (900 mV @ 10 mA consistent across all candidates)

Substitute parts are grouped into two categories: standard industrial-grade zener diodes and automotive-grade zener diodes with AEC-Q101 qualification. All substitute parts maintain the same nominal zener voltage and package configuration as the main part.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max)	Temp Range	Grade	Packaging
MMBZ5246B-TP	Micro Commercial Co	16 V	±5%	350 mW	17 Ω	100 nA @ 12 V	900 mV @ 10 mA	-55 to 150°C	Industrial	Tape & Reel
BZX84B16LT1G	onsemi	16 V	±2%	250 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	Industrial	Tape & Reel
BZX84C16LT1G	onsemi	16 V	±6%	225 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	Industrial	Cut Tape & Digi-Reel
MMBZ5246BLT1G	onsemi	16 V	±5%	225 mW	17 Ω	100 nA @ 12 V	900 mV @ 10 mA	-65 to 150°C	Industrial	Cut Tape & Digi-Reel
SZBZX84B16LT1G	onsemi	16 V	±2%	250 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	Automotive	Tape & Reel
SZBZX84C16ET1G	onsemi	16 V	±6%	225 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	Automotive	Tape & Reel
SZBZX84C16ET3G	onsemi	16 V	±6%	225 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	Automotive	Tape & Reel
SZBZX84C16LT1G	onsemi	16 V	±5%	250 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	Automotive	Tape & Reel
SZBZX84C16LT3G	onsemi	16 V	±5%	250 mW	40 Ω	50 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	Automotive	Tape & Reel
SZMMBZ5246BLT1G	onsemi	16 V	±5%	225 mW	17 Ω	100 nA @ 12 V	900 mV @ 10 mA	-65 to 150°C	Automotive	Tape & Reel

Engineering Selection Recommendations

Industrial-Grade Substitutes (Non-Automotive):

BZX84B16LT1G and SZBZX84B16LT1G are direct substitutes with tighter voltage tolerance (±2%) and lower reverse leakage current (50 nA). These parts are suitable for applications where lower impedance variation is required. Power rating is reduced to 250 mW, which is acceptable for circuits designed within this thermal envelope.

BZX84C16LT1G and SZBZX84C16ET1G offer wider voltage tolerance (±6%) and reduced power rating (225 mW). These parts are suitable for cost-optimized designs where voltage tolerance margins are adequate.

MMBZ5246BLT1G maintains impedance characteristics identical to the main part (17 Ohms) with matching voltage tolerance (±5%) and reverse leakage (100 nA @ 12 V). Power rating is reduced to 225 mW. This part provides the closest electrical match to MMBZ5246B-TP with extended lower operating temperature limit (-65°C vs -55°C).

Automotive-Grade Substitutes (AEC-Q101 Qualified):

SZBZX84B16LT1G, SZBZX84C16ET1G, SZBZX84C16ET3G, SZBZX84C16LT1G, SZBZX84C16LT3G, and SZMMBZ5246BLT1G are automotive-qualified alternatives with AEC-Q101 certification. These parts are required for automotive applications and meet enhanced reliability and qualification standards. SZMMBZ5246BLT1G provides the closest electrical match to the main part with identical impedance (17 Ohms) and reverse leakage characteristics.

All substitute parts are RoHS3 compliant, REACH unaffected, and classified as EAR99 with identical HTSUS coding. All parts maintain MSL 1 (Unlimited) moisture sensitivity level.

Frequently Asked Questions (FAQ)

Q: Can BZX84B16LT1G replace MMBZ5246B-TP directly in my circuit?

A: BZX84B16LT1G is electrically compatible as a substitute. Both parts share the same 16 V nominal zener voltage, SOT-23 package, and 900 mV forward voltage specification. The primary difference is reduced power rating (250 mW vs 350 mW) and higher impedance (40 Ohms vs 17 Ohms). Substitution is valid if circuit thermal design accommodates the lower power rating and impedance variation is within acceptable margins.

Q: What is the difference between industrial-grade and automotive-grade zener diodes?

A: Automotive-grade parts (SZBZX84 and SZMMBZ5246 series) carry AEC-Q101 qualification, indicating compliance with automotive reliability and qualification standards. These parts undergo enhanced testing and screening. Industrial-grade parts (BZX84 and MMBZ5246 series without SZ prefix) are suitable for general industrial applications. Selection depends on application requirements and end-use environment.

Q: Why do some substitute parts have lower power ratings?

A: Power rating variation reflects different die designs and thermal management capabilities within the same package. Lower power ratings (225 mW or 250 mW) are acceptable substitutes if circuit design operates within these thermal limits. Circuit analysis must confirm that maximum power dissipation does not exceed the substitute part's rating.

Q: Are all substitute parts available in the same packaging format?

A: No. MMBZ5246B-TP is supplied in Tape & Reel (TR) format. Substitute parts are available in both Tape & Reel and Cut Tape & Digi-Reel formats. Packaging format selection depends on manufacturing process requirements and volume considerations. Electrical specifications remain identical regardless of packaging format.

Q: What does voltage tolerance (±2%, ±5%, ±6%) mean for zener diode selection?

A: Voltage tolerance specifies the allowable deviation from the nominal 16 V zener voltage. ±2% tolerance provides the tightest specification (15.68 V to 16.32 V), while ±6% tolerance allows wider variation (15.04 V to 16.96 V). Circuit design must accommodate the tolerance range of the selected part. Tighter tolerance parts are preferred for precision voltage reference applications.

Q: Can I use SZMMBZ5246BLT1G in a non-automotive application?

A: Yes. Automotive-qualified parts exceed industrial requirements and are fully compatible with non-automotive applications. SZMMBZ5246BLT1G provides superior reliability characteristics and is suitable for any application requiring 16 V zener diode functionality. Selection of automotive-grade parts for non-automotive use is a design choice based on reliability requirements and cost considerations.

Q: What is impedance (Zzt) and why does it vary between substitute parts?

A: Impedance (Zzt) is the dynamic resistance of the zener diode in the breakdown region. Lower impedance (17 Ohms) provides better voltage regulation with varying load current. Higher impedance (40 Ohms) results in greater voltage variation across load changes. Circuit design must account for impedance specifications to ensure voltage regulation performance meets system requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected. Compliance status is identical across all parts, ensuring environmental and regulatory compatibility for applications requiring RoHS certification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message