MM3Z27VT1 Equivalent & Substitute Parts

Part Overview

The MM3Z27VT1 is a Zener Diode rated at 27 V nominal voltage with 200 mW maximum power dissipation in a surface mount SOD-323 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute components maintain the core electrical specifications while offering improved availability, compliance certifications, and in some cases enhanced performance characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Tolerance	±7%	-
Power - Max	200	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 18.9 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65°C to 150°C	-
Mounting Type	Surface Mount	-
Package / Case	SC-76, SOD-323	-
RoHS Status	RoHS non-compliant	-

Substitute Part Grouping Explanation

Substitution of the MM3Z27VT1 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 27 V nominal
Package type: SOD-323 (SC-76)
Mounting: Surface mount
Operating temperature range: -65°C to 150°C minimum
Impedance (Max): 80 Ohms

Secondary Compatibility Factors:

Power dissipation: 200 mW minimum (higher ratings acceptable for derating applications)
Voltage tolerance: ±7% or tighter
Reverse leakage current: 50 nA @ 18.9 V or lower
Forward voltage: 900 mV @ 10 mA or lower

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications and SOD-323 packaging, differing only in product status (active vs. obsolete) or RoHS compliance.

Parametric Equivalents: Parts meeting all critical electrical parameters with potential variations in power rating, impedance, or temperature range that remain within acceptable operating margins for standard applications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Vf @ If (mV)	Temp Range (°C)	Package	Product Status	RoHS
MM3Z27VT1	onsemi	27	±7%	200	80	900 @ 10 mA	-65 to 150	SOD-323	Obsolete	Non-compliant
MM3Z27VT1G	onsemi	27	±5%	300	80	900 @ 10 mA	-65 to 150	SOD-323	Active	ROHS3 Compliant
BZX384-C27,115	NXP Semiconductors	27	±5%	300	80	1.1 @ 100 mA	-65 to 150	SOD-323	Active	Compliant
CZRF52C27	Comchip Technology	27	±5%	200	80	900 @ 10 mA	-55 to 125	1005/SOD-323F	Active	ROHS3 Compliant
PZU27BA,115	Nexperia USA Inc.	27	±5%	320	40	1.1 @ 100 mA	-55 to 150	SOD-323	Active	ROHS3 Compliant
BZT52C27S-7-F	Diodes Incorporated	27	±7%	200	80	900 @ 10 mA	-65 to 150	SOD-323	Active	ROHS3 Compliant
BZT52C27S-TP	Micro Commercial Co	27	±7%	200	80	900 @ 10 mA	-65 to 150	SOD-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Highest Compatibility):

MM3Z27VT1G (onsemi) and BZT52C27S-7-F (Diodes Incorporated) and BZT52C27S-TP (Micro Commercial Co) are direct functional replacements. These parts maintain identical electrical specifications to the MM3Z27VT1 with the exception of improved RoHS3 compliance and active product status. MM3Z27VT1G offers the additional benefit of higher power rating (300 mW vs. 200 mW) while maintaining all other parameters, providing enhanced thermal margin. BZT52C27S-7-F and BZT52C27S-TP maintain the exact 200 mW power specification with matching tolerance and impedance characteristics.

Tier 2 - Functional Equivalents (Acceptable Substitution):

BZX384-C27,115 (NXP Semiconductors) meets all critical electrical parameters with improved tolerance (±5%) and higher power rating (300 mW). The forward voltage specification differs at a higher test current (1.1 V @ 100 mA vs. 900 mV @ 10 mA), which does not affect zener regulation performance. This part is suitable for applications where the higher power rating provides design margin.

PZU27BA,115 (Nexperia USA Inc.) provides the highest power rating (320 mW) and improved impedance specification (40 Ohms vs. 80 Ohms), resulting in superior voltage regulation characteristics. Operating temperature range is reduced to -55°C minimum. This part is recommended for applications requiring enhanced thermal performance or tighter voltage regulation.

Tier 3 - Constrained Substitution:

CZRF52C27 (Comchip Technology) maintains the 200 mW power specification and matching electrical characteristics but uses a 1005 package variant (SOD-323F). Operating temperature range is reduced to -55°C to 125°C. This part is suitable only for applications operating within the reduced temperature range and where the 1005 package footprint is compatible with the design.

All substitute parts listed maintain RoHS3 compliance or equivalent environmental certifications, addressing the non-compliant status of the obsolete MM3Z27VT1.

Frequently Asked Questions (FAQ)

Q: Can MM3Z27VT1G be used as a direct replacement for MM3Z27VT1?

A: Yes. MM3Z27VT1G is a direct replacement with identical zener voltage (27 V), impedance (80 Ohms), and operating temperature range (-65°C to 150°C). The substitute offers improved tolerance (±5% vs. ±7%), higher power rating (300 mW vs. 200 mW), and active product status with RoHS3 compliance.

Q: What is the difference between SOD-323 and 1005 packages?

A: SOD-323 (SC-76) and 1005 (2512 Metric) are distinct surface mount package types with different footprints and land patterns. CZRF52C27 uses the 1005/SOD-323F variant. Verify PCB layout compatibility before substitution. The packages are not interchangeable without board redesign.

Q: Why do some substitutes have higher power ratings?

A: Higher power ratings (300 mW or 320 mW vs. 200 mW) provide thermal margin and allow operation at higher current levels without exceeding junction temperature limits. These parts are fully compatible with 200 mW applications and offer improved reliability through reduced thermal stress.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are RoHS3 compliant or equivalent. The original MM3Z27VT1 is RoHS non-compliant. Substitution addresses environmental and regulatory compliance requirements for new designs and production.

Q: What is the significance of impedance (Zzt) differences?

A: Impedance affects voltage regulation quality. Lower impedance (40 Ohms in PZU27BA,115 vs. 80 Ohms in MM3Z27VT1) provides tighter voltage regulation and faster transient response. Higher impedance parts maintain acceptable regulation for standard applications. Selection depends on circuit requirements for voltage stability.

Q: Can BZX384-C27,115 be substituted if forward voltage specifications differ?

A: Yes. The forward voltage difference (1.1 V @ 100 mA vs. 900 mV @ 10 mA) reflects different test conditions and does not affect zener diode regulation performance. The zener voltage specification (27 V) and impedance (80 Ohms) determine regulation characteristics. Forward voltage is relevant only for forward-biased operation, which is not the primary function in zener regulation circuits.

Q: What is the minimum operating temperature consideration for CZRF52C27?

A: CZRF52C27 operates from -55°C to 125°C, compared to -65°C to 150°C for MM3Z27VT1. This part is suitable only for applications with operating temperature ranges within -55°C to 125°C. Verify application temperature requirements before selection.

Q: Are there packaging considerations for tape and reel (TR) variants?

A: Tape and reel packaging is standard for automated assembly processes. All substitute parts listed with TR designation are supplied on continuous tape suitable for pick-and-place equipment. Verify reel specifications and quantity requirements with supplier documentation.

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