MMBZ5246B-7 Equivalent & Substitute Parts

Part Overview

The MMBZ5246B-7 is a Zener diode rated at 16 V nominal with 350 mW maximum power dissipation in a surface mount SOT-23-3 package. Manufactured by Diodes Incorporated, this component is discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements. Substitute parts must maintain electrical compatibility across voltage regulation, power handling, and thermal operating ranges while accommodating packaging and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5%	—
Power - Max	350	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 12 V	—
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	—
Operating Temperature	-65°C to 150°C	—
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5246B-7 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Zener voltage must be 16 V nominal
Tolerance must accommodate ±5% or tighter specification
Power dissipation must be sufficient for 350 mW or greater
Impedance characteristics must support circuit regulation requirements
Reverse leakage current must not exceed specified limits
Forward voltage drop must remain within acceptable operating margins

Mechanical & Thermal Requirements:

Surface mount package in SOT-23-3 or equivalent footprint
Operating temperature range must span -65°C to 150°C minimum
Moisture sensitivity level must be 1 (Unlimited) or equivalent

Compliance & Availability:

RoHS3 compliance preferred for new designs
Active product status ensures long-term availability
Automotive qualification (AEC-Q101) available for enhanced reliability applications

Substitute parts are grouped into three categories: parametric equivalents (identical electrical specifications), manufacturer-recommended alternatives (active production status), and functional substitutes (compatible electrical performance with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ 10mA (mV)	Temp Range (°C)	Status	RoHS
MMBZ5246B-7	Diodes Inc.	16	±5%	350	17	900	-65 to 150	Discontinued	Non-compliant
MMBZ5246B-7-F	Diodes Inc.	16	±5%	350	17	900	-65 to 150	Active	ROHS3
MMBZ5246B-TP	Micro Commercial Co	16	±5%	350	17	900	-55 to 150	Active	ROHS3
BZX84C16-7-F	Diodes Inc.	16	±6%	300	40	900	-65 to 150	Active	ROHS3
BZX84-B16,215	NXP Semiconductors	16	±2%	250	40	900	-65 to 150	Active	ROHS3
BZX84B16-HE3-08	Vishay	16	±2%	300	40	—	-55 to 150	Obsolete	ROHS3
BZX84C16-G3-18	Vishay	16	±5%	300	40	—	-55 to 150	Active	ROHS3
BZX84C16-HE3-18	Vishay	16	±5%	300	40	—	-55 to 150	Obsolete	ROHS3
BZX84C16-TP	Micro Commercial Co	16	±5%	350	40	900	-55 to 150	Active	ROHS3
BZX84C16LT1G	onsemi	16	±6%	225	40	900	-65 to 150	Active	ROHS3
MMBZ5246BLT1G	onsemi	16	±5%	225	17	900	-65 to 150	Active	ROHS3

Engineering Selection Recommendations

Parametric Equivalent (Preferred for Direct Replacement):

MMBZ5246B-7-F is the primary equivalent, offering identical electrical specifications to the original MMBZ5246B-7 with active product status and RoHS3 compliance. This part maintains 350 mW power rating, 17 Ohm impedance, and ±5% tolerance. The -7-F suffix indicates RoHS3 compliance and active manufacturing status at Diodes Incorporated.

Full Electrical Equivalents (Same Power Rating):

MMBZ5246B-TP (Micro Commercial Co) and BZX84C16-TP (Micro Commercial Co) both provide 350 mW power dissipation with 16 V nominal zener voltage. Both are active products with RoHS3 compliance. Operating temperature minimum is -55°C versus -65°C for the original specification.

Reduced Power Alternatives (300 mW Rating):

BZX84C16-7-F (Diodes Inc.), BZX84C16-G3-18 (Vishay), and BZX84C16-HE3-18 (Vishay) operate at 300 mW maximum power. These parts are suitable for applications where 300 mW dissipation is sufficient. BZX84C16-7-F maintains the full -65°C to 150°C temperature range. Vishay parts operate from -55°C to 150°C.

Lower Power Alternatives (225-250 mW Rating):

BZX84C16LT1G (onsemi) and MMBZ5246BLT1G (onsemi) provide 225 mW power rating. BZX84-B16,215 (NXP) provides 250 mW with ±2% tolerance and AEC-Q101 automotive qualification. These alternatives are suitable only for applications with reduced thermal requirements.

Obsolete Parts (Not Recommended for New Designs):

BZX84B16-HE3-08 and BZX84C16-HE3-18 are marked obsolete and should not be selected for new production designs despite available inventory.

Frequently Asked Questions (FAQ)

Q: Can MMBZ5246B-7-F directly replace MMBZ5246B-7?

A: Yes. MMBZ5246B-7-F is a parametric equivalent with identical electrical specifications: 16 V nominal zener voltage, ±5% tolerance, 350 mW power rating, 17 Ohm impedance, and -65°C to 150°C operating range. The primary difference is active product status and RoHS3 compliance.

Q: What is the difference between 350 mW and 300 mW rated parts?

A: Power rating determines maximum continuous power dissipation. A 350 mW part can safely dissipate more heat than a 300 mW part. Selection depends on circuit current and voltage conditions. If circuit design requires 350 mW dissipation capability, 300 mW alternatives are not suitable.

Q: Are Vishay BZX84C16 parts compatible with the original MMBZ5246B-7?

A: Vishay BZX84C16 parts share the same 16 V zener voltage and SOT-23-3 package. However, they operate at 300 mW maximum power versus 350 mW for the original. Operating temperature range is -55°C to 150°C versus -65°C to 150°C. Impedance is 40 Ohms versus 17 Ohms. These differences may affect circuit performance depending on application requirements.

Q: Why do some parts have lower impedance (17 Ohms) and others higher (40 Ohms)?

A: Impedance affects voltage regulation characteristics under load changes. Lower impedance (17 Ohms) provides better voltage stability. Parts with 40 Ohm impedance may exhibit greater voltage variation with current changes. Circuit design determines whether this difference is acceptable.

Q: Can I use a 225 mW part instead of 350 mW?

A: Only if circuit analysis confirms that maximum power dissipation does not exceed 225 mW. Using an undersized part in a high-power application causes excessive junction temperature and premature failure.

Q: What does RoHS3 compliance mean?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. RoHS3 compliant parts are required for most commercial and industrial applications.

Q: Are automotive-qualified parts (AEC-Q101) necessary?

A: AEC-Q101 qualification is required only for automotive applications. BZX84-B16,215 (NXP) carries this qualification. For non-automotive applications, standard industrial-grade parts are acceptable.

Q: Does operating temperature range affect part selection?

A: Yes. If the application operates below -55°C, parts with -55°C minimum rating are unsuitable. The original MMBZ5246B-7 and its equivalent MMBZ5246B-7-F support -65°C minimum. Verify application temperature requirements before selecting alternatives.

Q: Can I substitute parts with different tolerance specifications?

A: Tolerance affects zener voltage accuracy. The original ±5% tolerance means zener voltage ranges from 15.2 V to 16.8 V. Parts with ±2% tolerance (NXP, Vishay) provide tighter voltage control (15.68 V to 16.32 V). Parts with ±6% tolerance (Diodes, onsemi) have wider variation (15.04 V to 16.96 V). Circuit design determines acceptable tolerance range.

Q: What is the significance of the part number suffix (-7-F, -TP, LT1G)?

A: Suffixes indicate packaging format and compliance status. -7-F indicates cut tape with RoHS3 compliance. -TP indicates tape and reel packaging. LT1G indicates onsemi's packaging designation. These suffixes do not affect electrical performance but determine availability and packaging quantity.

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