MM5Z27VT1 Equivalent & Substitute Parts

Part Overview

The MM5Z27VT1 is a Zener diode manufactured by onsemi, rated at 27 V nominal voltage with 100 mW maximum power dissipation in a SOD-523 surface mount package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer is no longer available. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	27	V
Tolerance	±7%	—
Power - Max	100	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	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-523	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MM5Z27VT1 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 27 V nominal
Operating temperature range: -65°C to 150°C
Reverse leakage current: 50 nA @ 18.9 V
Forward voltage: 900 mV @ 10 mA
Impedance (Max): 80 Ohms

Secondary Considerations:

Power dissipation capacity (100 mW minimum)
Tolerance specification (±7% or tighter)
Surface mount packaging compatibility
RoHS compliance status for new designs

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: Parts from onsemi with identical electrical specifications but improved product status (active vs. obsolete).

Similar Manufacturer Parts: Parts from alternative manufacturers (Nexperia USA Inc., Micro Commercial Co, Comchip Technology) that meet or exceed the electrical and thermal requirements of the MM5Z27VT1. These parts may feature enhanced power ratings, improved tolerance, automotive-grade qualifications, or RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Package	Product Status	RoHS Status
MM5Z27VT1	onsemi	27	±7%	100	80	SOD-523	Obsolete	Non-compliant
MM3Z27VT1G	onsemi	27	±5%	300	80	SOD-323	Active	ROHS3 Compliant
BZT52H-C27,115	Nexperia USA Inc.	27	±5%	375	40	SOD-123F	Active	ROHS3 Compliant
BZX585-B27,115	Nexperia USA Inc.	27	±2%	300	80	SOD-523	Active	ROHS3 Compliant
BZX585-C27,115	Nexperia USA Inc.	27	±5%	300	80	SOD-523	Active	ROHS3 Compliant
BZX84J-B27,115	Nexperia USA Inc.	27	±2%	550	40	SOD-323F	Active	ROHS3 Compliant
BZX84J-C27,115	Nexperia USA Inc.	27	±5%	550	40	SOD-323F	Active	ROHS3 Compliant
BZX84J-C27,135	Nexperia USA Inc.	27	±5%	550	40	SOD-323F	Active	ROHS3 Compliant
CZRU52C27	Comchip Technology	27	±5%	150	80	0603/SOD-523F	Active	ROHS3 Compliant
BZT52C27T-TP	Micro Commercial Co	27	±7%	100	80	SOD-523	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Same Package, Active Status):

The BZT52C27T-TP from Micro Commercial Co is a parametric equivalent to the MM5Z27VT1. Both parts share identical electrical specifications: 27 V nominal voltage, ±7% tolerance, 100 mW power rating, 80 Ohms maximum impedance, and SOD-523 packaging. The BZT52C27T-TP is currently in active production status with ROHS3 compliance, making it suitable for new designs and ongoing production support.

For Enhanced Performance (Same Zener Voltage, Improved Specifications):

The MM3Z27VT1G from onsemi provides a direct manufacturer upgrade path. It maintains the 27 V specification with improved tolerance (±5%), increased power capacity (300 mW), and ROHS3 compliance. However, the package changes from SOD-523 to SOD-323, requiring PCB layout modification.

The BZX585-C27,115 from Nexperia USA Inc. offers the same SOD-523 package as the original part with enhanced specifications: ±5% tolerance, 300 mW power rating, and ROHS3 compliance. This part includes automotive-grade qualification (AEC-Q100), suitable for applications requiring enhanced reliability.

For Automotive Applications:

The BZX84J-C27,115 and BZX84J-C27,135 from Nexperia USA Inc. are automotive-qualified (AEC-Q101) alternatives with 27 V specification, ±5% tolerance, and 550 mW power capacity in SOD-323F packaging. These parts are recommended for automotive or high-reliability applications where AEC qualification is required.

For Compact Form Factor:

The CZRU52C27 from Comchip Technology provides a 27 V Zener diode in 0603/SOD-523F packaging with 150 mW power rating and ±5% tolerance. This option is suitable for space-constrained applications while maintaining the general SOD-523 form factor family.

Frequently Asked Questions (FAQ)

Q: Can the MM5Z27VT1 be directly replaced with the BZT52C27T-TP?

A: Yes. Both parts share identical electrical specifications: 27 V nominal voltage, ±7% tolerance, 100 mW power dissipation, 80 Ohms impedance, and SOD-523 packaging. The BZT52C27T-TP is in active production with ROHS3 compliance.

Q: What is the difference between SOD-523 and SOD-323 packages?

A: SOD-523 and SOD-323 are distinct surface mount packages with different physical dimensions and land patterns. SOD-523 is smaller than SOD-323. Substitution between these packages requires PCB layout modification and cannot be performed without design changes.

Q: Why do some substitute parts have higher power ratings than the original MM5Z27VT1?

A: Higher power ratings (300 mW, 375 mW, 550 mW) indicate enhanced thermal capability and design margin. These parts are fully compatible with applications designed for 100 mW operation, as they can safely dissipate the lower power levels while providing additional headroom for thermal stress or future design iterations.

Q: What does ROHS3 compliance mean for this application?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. ROHS3-compliant parts are required for new designs and applications subject to environmental regulations in the European Union and other jurisdictions.

Q: Are the Nexperia BZX585 and BZX84J series interchangeable?

A: The BZX585 series (SOD-523 package) and BZX84J series (SOD-323F package) are not interchangeable due to different physical packages. However, both series meet the 27 V electrical specification and can serve as functional alternatives if PCB layout permits package substitution.

Q: Can I use the MM3Z27VT1G as a drop-in replacement?

A: The MM3Z27VT1G is not a drop-in replacement due to package change from SOD-523 to SOD-323. PCB layout modification is required. However, it is an onsemi product with improved specifications and active production status.

Q: What is the significance of automotive qualification (AEC-Q101)?

A: AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards. Parts with this qualification are suitable for automotive applications and environments requiring enhanced reliability testing and traceability.

Q: How do tolerance specifications affect part selection?

A: Tolerance specifications (±7%, ±5%, ±2%) define the acceptable variation range of the Zener voltage from the nominal 27 V value. Tighter tolerances (±2%) provide more precise voltage regulation. Selection depends on application requirements for voltage accuracy and regulation performance.

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