MMSZ5237C-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The MMSZ5237C-TP is an 8.2 V, 500 mW surface mount zener diode manufactured by Micro Commercial Co in SOD-123 packaging. This component is classified as Active and is used for voltage regulation and protection in electronic circuits. Equivalent and substitute parts are identified based on matching electrical specifications including nominal zener voltage, power dissipation rating, tolerance, and package type. Alternative sources and variants are necessary to ensure design flexibility, supply chain continuity, and application-specific requirements such as packaging format or tolerance grades.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	8.2	V
Tolerance	±2%	—
Power - Max	500	mW
Impedance (Max)	8	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 6 V
Voltage - Forward (Max) @ If	900	mV @ 10 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—

Substitute Part Grouping Explanation

Substitute parts for the MMSZ5237C-TP are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes maintain identical or equivalent electrical specifications within the same package type (SOD-123). These parts share the same nominal zener voltage (8.2 V), power rating (500 mW), tolerance (±2%), and operating temperature range (-55°C to 150°C). Direct substitutes are interchangeable in circuit designs without modification.

Similar Substitutes share the same nominal zener voltage (8.2 V) and package type (SOD-123) but differ in one or more of the following parameters: power dissipation rating, tolerance grade, impedance, or reverse leakage current. These parts are suitable for applications where the specified parameter variation is acceptable within the circuit design margins.

Key Parameters Determining Substitution:

Nominal Zener Voltage (Vz): 8.2 V (required match)
Package Type: SOD-123 or SOD-323 (package compatibility)
Power Rating: 500 mW (primary), 410 mW or 200 mW (reduced power applications)
Tolerance: ±2% (direct), ±5% (similar)
Operating Temperature Range: -55°C to 150°C (standard)
Mounting Type: Surface Mount (required match)

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (µA/nA)	Package	Packaging Type
MMSZ5237C-TP	Micro Commercial Co	8.2	±2%	500	8	3 µA @ 6 V	SOD-123	Bulk
MMSZ5237C-E3-08	Vishay General Semiconductor	8.2	±2%	500	8	3 µA @ 6.5 V	SOD-123	Tape & Reel
MMSZ5237C-E3-18	Vishay General Semiconductor	8.2	±2%	500	8	3 µA @ 6.5 V	SOD-123	Tape & Reel
BZT52C8V2-G3-08	Vishay General Semiconductor	8.2	±5%	410	7	100 nA @ 6 V	SOD-123	Tape & Reel
DDZ8V2CS-7	Diodes Incorporated	8.2	±2.55%	200	8	100 nA @ 6.5 V	SOD-323	Tape & Reel
DDZ9694S-7	Diodes Incorporated	8.2	±5%	200	—	100 nA @ 6.2 V	SOD-323	Tape & Reel
MMSZ4694-E3-08	Vishay General Semiconductor	8.2	±5%	500	—	1 µA @ 6.2 V	SOD-123	Tape & Reel
MMSZ4694-E3-18	Vishay General Semiconductor	8.2	±5%	500	—	1 µA @ 6.2 V	SOD-123	Tape & Reel
MMSZ5237BT1G	onsemi	8.2	±5%	500	8	3 µA @ 6.5 V	SOD-123	Cut Tape & Digi-Reel
MMSZ8V2T1G	onsemi	8.2	±5%	500	15	700 nA @ 5 V	SOD-123	Tape & Reel
SZMMSZ4694T1G	onsemi	8.2	±5%	500	—	1 µA @ 6.2 V	SOD-123	Tape & Reel

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Specifications):

MMSZ5237C-E3-08 and MMSZ5237C-E3-18 from Vishay General Semiconductor are direct substitutes for the MMSZ5237C-TP. Both parts maintain the same nominal zener voltage (8.2 V), tolerance (±2%), power rating (500 mW), impedance (8 Ohms), and operating temperature range. These parts are ROHS3 compliant with MSL 1 rating and are available in Tape & Reel packaging. The primary difference is packaging format (Tape & Reel versus Bulk), making them suitable for high-volume production environments.

Similar Substitutes for Reduced Power Applications:

BZT52C8V2-G3-08 from Vishay General Semiconductor is suitable for applications where a 410 mW power rating is acceptable. This part maintains the 8.2 V nominal zener voltage and SOD-123 package but features a ±5% tolerance and lower reverse leakage current (100 nA @ 6 V). The BZT52-G series designation indicates this is a specialized variant.

DDZ8V2CS-7 and DDZ9694S-7 from Diodes Incorporated are suitable for space-constrained applications requiring reduced power dissipation (200 mW). Both parts maintain the 8.2 V nominal zener voltage but use the smaller SOD-323 package. These parts feature lower reverse leakage currents (100 nA) and are ROHS3 compliant.

Similar Substitutes for Standard Applications:

MMSZ4694-E3-08 and MMSZ4694-E3-18 from Vishay General Semiconductor maintain the 500 mW power rating and SOD-123 package but feature a ±5% tolerance grade. These parts are suitable for applications where tighter tolerance is not required.

MMSZ5237BT1G from onsemi is available in Cut Tape & Digi-Reel packaging and features a ±5% tolerance. This part is part of the MMSZ52xxxT1G series and maintains the 500 mW power rating and SOD-123 package.

MMSZ8V2T1G from onsemi maintains the 500 mW power rating and SOD-123 package but features a higher impedance (15 Ohms) and lower reverse leakage current (700 nA @ 5 V). This part is suitable for applications where impedance characteristics differ from the primary specification.

SZMMSZ4694T1G from onsemi is an automotive-grade variant (AEC-Q101 qualified) with ±5% tolerance, 500 mW power rating, and SOD-123 package. This part is suitable for automotive applications requiring qualification compliance.

Compliance and Certification:

All substitute parts listed are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification. All parts maintain MSL 1 (Unlimited) moisture sensitivity level. Product status for all parts is Active.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5237C-E3-08 directly replace MMSZ5237C-TP in production?

A: Yes. MMSZ5237C-E3-08 is a direct substitute with identical electrical specifications (8.2 V, ±2%, 500 mW, SOD-123). The primary difference is packaging format (Tape & Reel versus Bulk). Both parts are ROHS3 compliant and maintain the same operating temperature range.

Q: What is the difference between ±2% and ±5% tolerance parts?

A: Tolerance specifies the allowable deviation from the nominal zener voltage. MMSZ5237C-TP with ±2% tolerance maintains zener voltage between 8.036 V and 8.364 V. Parts with ±5% tolerance (such as MMSZ4694-E3-08) maintain zener voltage between 7.79 V and 8.61 V. Applications requiring tighter voltage regulation must use ±2% tolerance parts.

Q: Can I use DDZ8V2CS-7 (200 mW) instead of MMSZ5237C-TP (500 mW)?

A: DDZ8V2CS-7 is suitable only if the circuit design accommodates the reduced power dissipation rating. The 200 mW rating limits the maximum current the diode can safely conduct. Use this part only when power requirements are confirmed to be below 200 mW. Additionally, DDZ8V2CS-7 uses SOD-323 packaging, which is physically smaller than SOD-123.

Q: What is the significance of the packaging designation (Bulk, Tape & Reel, Cut Tape)?

A: Packaging format affects supply chain logistics and assembly processes. Bulk packaging is suitable for small quantities or manual assembly. Tape & Reel packaging is standard for automated pick-and-place assembly in high-volume production. Cut Tape & Digi-Reel is an intermediate format. All formats contain identical components; the difference is in delivery and handling method.

Q: Is SZMMSZ4694T1G suitable for non-automotive applications?

A: SZMMSZ4694T1G is automotive-grade (AEC-Q101 qualified) and maintains the same electrical specifications as standard variants. It is suitable for any application, though automotive qualification adds cost. Use standard-grade parts (such as MMSZ4694-E3-08) for non-automotive applications to optimize cost.

Q: What does MSL 1 (Unlimited) moisture sensitivity level mean?

A: MSL 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All substitute parts listed carry MSL 1 rating, eliminating moisture-related reliability concerns.

Q: Can I mix different manufacturers' parts in the same circuit board?

A: Yes. All substitute parts maintain the same nominal zener voltage (8.2 V), operating temperature range (-55°C to 150°C), and package type (SOD-123 for most variants). Electrical performance differences are within acceptable design margins for standard applications. Verify tolerance and power rating requirements for your specific circuit design.

Q: What is the difference between impedance (Zzt) values of 8 Ohms versus 15 Ohms?

A: Impedance affects the diode's dynamic resistance at the zener operating point. Lower impedance (8 Ohms) provides better voltage regulation under varying load conditions. Higher impedance (15 Ohms, as in MMSZ8V2T1G) results in slightly greater voltage variation but may be acceptable in applications with stable load conditions. Verify impedance requirements for your specific circuit design.

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