MMBZ5245C-E3-18 Equivalent & Substitute Parts

Part Overview

The MMBZ5245C-E3-18 is a 15 V Zener diode rated at 225 mW in a surface mount SOT-23-3 package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts maintain the core electrical specifications while offering improved availability and extended product lifecycle support.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	15	V
Tolerance	±2%	—
Power - Maximum	225	mW
Impedance (Maximum)	16	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 11 V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBZ5245C-E3-18 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 15 V nominal
Package type: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface mount
RoHS3 compliance
MSL rating: 1 (Unlimited)

Secondary Compatibility Factors:

Power dissipation rating (225 mW minimum acceptable; higher ratings provide design margin)
Impedance (16 Ohms nominal; 30 Ohms acceptable within tolerance)
Reverse leakage current (100 nA @ 11 V or 50 nA @ 10.5 V acceptable)
Operating temperature range (-55°C to 150°C minimum; -65°C to 150°C provides extended range)
Voltage tolerance (±2% to ±6% acceptable for regulation applications)

Substitute parts are grouped into two categories: direct replacements with identical or superior power ratings and electrical characteristics, and functional equivalents with acceptable parameter variations within standard design tolerances.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Temp Range (°C)	Status
MMBZ5245C-E3-18	Vishay	15	±2%	225	16	100 @ 11V	-55 to 150	Obsolete
BZX84B15-TP	Micro Commercial Co	15	±2%	350	30	100 @ 10.5V	-55 to 150	Active
BZX84C15 TR PBFREE	Central Semiconductor Corp	15	±5%	350	30	50 @ 10.5V	-65 to 150	Active
BZX84C15LT1G	onsemi	15	±6%	250	30	50 @ 10.5V	-65 to 150	Active
CMPZ5245B BK PBFREE	Central Semiconductor Corp	15	±5%	350	16	100 @ 11V	-65 to 150	Active
CMPZ5245B TR PBFREE	Central Semiconductor Corp	15	±5%	350	16	100 @ 11V	-65 to 150	Active
CZRT55C15-G	Comchip Technology	15	±6%	350	30	100 @ 10.5V	-65 to 150	Active
MMBZ5245B-TP	Micro Commercial Co	15	±5%	350	16	100 @ 11V	-55 to 150	Active
MMBZ5245BLT1G	onsemi	15	±5%	225	16	100 @ 11V	-65 to 150	Active
MMBZ5245BQ-7-F	Diodes Incorporated	15	±5%	350	16	100 @ 11V	-65 to 150	Active
MMBZ5245ELT1G	onsemi	15	±5%	225	16	100 @ 11V	-55 to 150	Active

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Performance):

MMBZ5245ELT1G (onsemi) and MMBZ5245BLT1G (onsemi) are functionally equivalent to the MMBZ5245C-E3-18, maintaining 225 mW power dissipation, 16 Ohms impedance, and 100 nA reverse leakage current. Both are active products with ROHS3 compliance and MSL 1 rating. MMBZ5245ELT1G operates at -55°C to 150°C (matching the original), while MMBZ5245BLT1G extends the lower temperature limit to -65°C. Voltage tolerance increases from ±2% to ±5%, which remains acceptable for standard Zener regulation applications.

Higher Power Rating Substitutes (Enhanced Design Margin):

MMBZ5245B-TP (Micro Commercial Co), CMPZ5245B BK PBFREE and CMPZ5245B TR PBFREE (Central Semiconductor Corp), and MMBZ5245BQ-7-F (Diodes Incorporated) provide 350 mW power dissipation with 16 Ohms impedance, offering 55% additional thermal headroom. These parts maintain the same reverse leakage characteristics and are ROHS3 compliant. MMBZ5245BQ-7-F includes AEC-Q101 automotive qualification and extended temperature range (-65°C to 150°C).

Alternative Impedance Designs (30 Ohms):

BZX84B15-TP (Micro Commercial Co), BZX84C15 TR PBFREE (Central Semiconductor Corp), CZRT55C15-G (Comchip Technology), and BZX84C15LT1G (onsemi) feature 30 Ohms impedance with 350 mW or 250 mW power ratings. These parts are suitable for applications where higher impedance is acceptable. BZX84C15LT1G provides the closest power match at 250 mW with extended temperature range (-65°C to 150°C).

Product Status Consideration:

All substitute parts listed are active products with ongoing manufacturer support, ensuring long-term availability and supply chain stability. The original MMBZ5245C-E3-18 is obsolete; transition to an active equivalent is required for new designs and ongoing production.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating (350 mW) in place of the 225 mW original?

A: Yes. Higher power ratings provide additional thermal margin without affecting electrical performance. The 15 V Zener voltage, impedance, and leakage characteristics remain compatible with the original circuit design. Thermal management may improve due to reduced junction temperature.

Q: What is the significance of impedance (Zzt) differences between 16 Ohms and 30 Ohms?

A: Impedance affects voltage regulation quality under load transients. Lower impedance (16 Ohms) provides superior regulation. Parts with 30 Ohms impedance are acceptable substitutes but exhibit slightly higher output impedance. Circuit performance differences are typically negligible in standard applications.

Q: Does the voltage tolerance change from ±2% to ±5% or ±6% affect circuit operation?

A: Tolerance changes are acceptable for most Zener regulation applications. The absolute voltage variation remains within ±0.9 V at 15 V nominal. Applications requiring tighter voltage control should specify tolerance requirements during part selection.

Q: Are all substitute parts RoHS3 compliant and MSL 1 rated?

A: Yes. All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental and regulatory status.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel packaging is supplied on continuous reels for automated pick-and-place assembly. Both formats contain identical components; packaging selection depends on assembly process requirements.

Q: Can I substitute a part with extended temperature range (-65°C to 150°C) for the original (-55°C to 150°C)?

A: Yes. Extended temperature range provides additional operational margin and is a direct upgrade. No circuit modifications are required. This is particularly beneficial for applications in extreme thermal environments.

Q: Is the MMBZ5245BQ-7-F automotive-qualified part suitable for non-automotive applications?

A: Yes. AEC-Q101 qualification indicates enhanced reliability testing and quality assurance. Automotive-qualified parts are suitable for any application and provide additional confidence in component reliability.

Q: What packaging format should I select for high-volume production?

A: Tape & Reel (TR) packaging is standard for automated assembly lines. Cut Tape (CT) and Digi-Reel formats are suitable for lower volumes or manual assembly processes. All formats contain electrically identical components.

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