MMSZ5253B Zener Diode 25V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The MMSZ5253B is a surface mount zener diode manufactured by onsemi, rated for 25V nominal zener voltage with 500mW power dissipation in SOD-123 packaging. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The part operates across the temperature range of -55°C to 150°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	25	V
Tolerance	±5	%
Power - Max	500	mW
Impedance (Max)	35	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 19V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	SOD-123

Substitute Part Grouping Explanation

Substitution of the MMSZ5253B is determined by the following critical parameters: nominal zener voltage (25V), power rating (500mW), voltage tolerance (±5%), package type (SOD-123), and operating temperature range (-55°C to 150°C). Parts are grouped into three categories based on substitution compatibility:

Direct Manufacturer Equivalents maintain identical electrical specifications and are manufactured by onsemi. These parts differ only in product status (active vs. obsolete) and packaging format (tape & reel vs. cut tape).

Parametric Equivalents are manufactured by onsemi under automotive-grade designations (SZMMSZ series) with AEC-Q101 qualification. These parts maintain all critical electrical parameters while adding automotive-grade reliability certifications.

Similar Parts from alternative manufacturers (Nexperia, Central Semiconductor, Vishay) meet the core electrical requirements but may have minor variations in secondary parameters such as reverse leakage current, impedance, or operating temperature range. These parts are suitable for applications where manufacturer flexibility is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance (%)	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Package	Status	RoHS
MMSZ5253B	onsemi	25	±5	500	35	100 @ 19V	900 @ 10mA	-55 to 150	SOD-123	Obsolete	N/A
MMSZ5253BT1G	onsemi	25	±5	500	35	100 @ 19V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ4710T1G	onsemi	25	±5	500	N/A	10 @ 19V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
SZMMSZ5253BT1G	onsemi	25	±5	500	35	100 @ 19V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
SZMMSZ5253ET1G	onsemi	25	±5	500	35	100 @ 19V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
CMHZ5253B TR PBFREE	Central Semiconductor	25	±5	500	35	100 @ 19V	900 @ 10mA	-65 to 150	SOD-123	Active	ROHS3
BZT52H-C24,115	Nexperia USA Inc.	24	±5	375	30	50 @ 16.8V	900 @ 10mA	-65 to 150	SOD-123F	Active	ROHS3
MMSZ4710-E3-08	Vishay	25	±5	500	N/A	10 @ 19V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ4710-E3-18	Vishay	25	±5	500	N/A	10 @ 19V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ4710-G3-08	Vishay	25	±5	500	N/A	10 @ 19V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3
MMSZ4710-G3-18	Vishay	25	±5	500	N/A	10 @ 19V	900 @ 10mA	-55 to 150	SOD-123	Active	ROHS3

Engineering Selection Recommendations

Primary Recommendation: MMSZ5253BT1G

MMSZ5253BT1G is the direct active equivalent manufactured by onsemi. This part maintains identical electrical specifications to the obsolete MMSZ5253B, including 25V nominal zener voltage, 500mW power rating, 35 Ohms maximum impedance, and 100nA reverse leakage current at 19V. The part is ROHS3 compliant and available in active production status with 66,195 pieces in stock. Tape & Reel packaging is standard for high-volume production environments.

Secondary Recommendation: SZMMSZ5253BT1G or SZMMSZ5253ET1G

For applications requiring automotive-grade reliability, SZMMSZ5253BT1G and SZMMSZ5253ET1G are onsemi automotive-qualified alternatives (AEC-Q101 certified). These parts maintain all electrical parameters of the original MMSZ5253B while providing enhanced qualification for automotive and harsh-environment applications. Both variants are active and ROHS3 compliant.

Alternative Recommendation: CMHZ5253B TR PBFREE

Central Semiconductor's CMHZ5253B provides identical electrical specifications with extended operating temperature range (-65°C to 150°C vs. -55°C to 150°C). This part is suitable for applications requiring lower minimum operating temperature. ROHS3 compliance and active production status are confirmed.

Conditional Recommendation: MMSZ4710 Series (Vishay)

Vishay MMSZ4710-E3-08, MMSZ4710-E3-18, MMSZ4710-G3-08, and MMSZ4710-G3-18 maintain 25V nominal voltage and 500mW power rating. These parts feature lower reverse leakage current (10nA vs. 100nA), which may be advantageous in low-leakage applications. Impedance data is not provided for these variants. All are active and ROHS3 compliant.

Not Recommended: BZT52H-C24,115

Nexperia's BZT52H-C24,115 differs in nominal zener voltage (24V vs. 25V) and power rating (375mW vs. 500mW). While the voltage difference falls within ±5% tolerance bands, the reduced power rating limits applicability to lower-power circuits. Package variant SOD-123F differs from SOD-123. This part is suitable only for applications with relaxed power requirements and 24V nominal voltage acceptance.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5253BT1G directly replace MMSZ5253B without circuit modification?

A: Yes. MMSZ5253BT1G is the direct active equivalent with identical electrical specifications: 25V nominal zener voltage, ±5% tolerance, 500mW power rating, 35 Ohms impedance, and 100nA reverse leakage current. Both use SOD-123 packaging. No circuit modification is required.

Q: What is the difference between MMSZ5253BT1G and SZMMSZ5253BT1G?

A: Both parts maintain identical electrical specifications. SZMMSZ5253BT1G is automotive-grade with AEC-Q101 qualification, suitable for automotive and harsh-environment applications. MMSZ5253BT1G is standard industrial-grade. Selection depends on application requirements for automotive certification.

Q: Why do Vishay MMSZ4710 parts show lower reverse leakage current (10nA vs. 100nA)?

A: Lower reverse leakage current is a characteristic difference of the MMSZ4710 series compared to MMSZ5253 series. Both maintain 25V nominal voltage and 500mW power rating. Lower leakage may be beneficial in applications sensitive to standby current consumption.

Q: Is BZT52H-C24,115 a suitable replacement?

A: BZT52H-C24,115 differs in nominal zener voltage (24V vs. 25V) and power rating (375mW vs. 500mW). While 24V falls within the ±5% tolerance window of 25V specifications, the reduced power rating limits applicability. This part is suitable only for applications accepting 24V nominal voltage and lower power dissipation requirements.

Q: What packaging formats are available for substitute parts?

A: MMSZ5253BT1G is available in Tape & Reel (TR) format. MMSZ4710T1G is available in Cut Tape (CT) & Digi-Reel format. Vishay MMSZ4710 variants are available in Tape & Reel. All maintain SOD-123 surface mount package footprint compatibility except BZT52H-C24,115, which uses SOD-123F variant.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed (MMSZ5253BT1G, SZMMSZ5253BT1G, SZMMSZ5253ET1G, CMHZ5253B TR PBFREE, and all Vishay MMSZ4710 variants) are ROHS3 compliant. The original MMSZ5253B is obsolete and ROHS compliance status is not specified.

Q: Which substitute part has the widest operating temperature range?

A: CMHZ5253B TR PBFREE and BZT52H-C24,115 both operate from -65°C to 150°C, compared to -55°C to 150°C for other parts. CMHZ5253B maintains identical electrical specifications, while BZT52H-C24,115 has reduced power rating and different nominal voltage.

Q: Can I use multiple substitute parts interchangeably in production?

A: MMSZ5253BT1G, SZMMSZ5253BT1G, and SZMMSZ5253ET1G are fully interchangeable from an electrical standpoint. Vishay MMSZ4710 variants are interchangeable with lower reverse leakage characteristics. CMHZ5253B is interchangeable with extended temperature range. BZT52H-C24,115 is not recommended due to voltage and power differences. Supplier qualification and procurement processes should be followed for production transitions.

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