SMBJ5949C/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ5949C/TR13 is a 100 V, 2 W Zener diode manufactured by Microchip Technology in Surface Mount Device (SMD) packaging. This component is classified as a Zener diode with a nominal voltage of 100 V and maximum power dissipation of 2 W, designed for voltage regulation and transient protection applications in electronic circuits. The part is currently in active production status with 802 units in stock. Equivalent and substitute parts are identified to address supply chain requirements, packaging preferences, or performance specification variations while maintaining functional compatibility within the 100 V Zener voltage class.

Substiute Parts

SMBJ5949C/TR13

Microchip TechnologyIn Stock: 863SMBJ5949C/TR13 Datasheet

Current PartRFQ

1SMB5949BT3G

onsemiIn Stock: 509491SMB5949BT3G Datasheet

SimilarRFQ

SZ1SMB5949BT3G

onsemiIn Stock: 1931SZ1SMB5949BT3G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ5949C/TR13 is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage: 100 V nominal (determines voltage regulation function)
• Package type: DO-214AA / SMB surface mount (ensures mechanical and electrical compatibility)
• Operating temperature range: -65°C to 150°C (defines thermal operating envelope)
• Mounting type: Surface Mount (PCB assembly compatibility)

Secondary Compatibility Parameters:

• Maximum power dissipation: 2 W or greater (allows higher-rated alternatives)
• Impedance (Maximum): 250 Ohms or lower (ensures dynamic response characteristics)
• Reverse leakage current: 1 µA @ 76 V or lower (maintains leakage specifications)
• Moisture Sensitivity Level: 1 (Unlimited) or equivalent (storage and handling compatibility)

The substitute parts identified (1SMB5949BT3G and SZ1SMB5949BT3G) share the same 100 V Zener voltage, DO-214AA/SMB package, and operating temperature range. Both substitutes provide equal or greater power dissipation (3 W), identical impedance specifications, and equivalent reverse leakage characteristics. Packaging format differences (Tape & Reel versus Cut Tape & Digi-Reel) do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

SMBJ5949C/TR13 (Microchip Technology): Use this part when RoHS non-compliant components are acceptable for the application and Microchip Technology supply chain is preferred. The ±2% tolerance provides tighter voltage regulation compared to substitute options. Tape & Reel packaging is standard for high-volume production environments.

1SMB5949BT3G (onsemi): This substitute is suitable for applications requiring ROHS3 compliance. The 3 W power rating provides 50% greater thermal headroom than the main part, allowing operation in higher-dissipation environments. Cut Tape & Digi-Reel packaging accommodates both low-volume and medium-volume production scenarios. The ±5% tolerance is acceptable for general voltage regulation applications where tighter tolerance is not critical.

SZ1SMB5949BT3G (onsemi): This substitute is specified for automotive applications requiring AEC-Q101 qualification. ROHS3 compliance is included. The 3 W power rating and Tape & Reel packaging match high-volume production requirements. AEC-Q101 qualification ensures suitability for automotive-grade electronic systems. The ±5% tolerance meets automotive voltage regulation standards.

All three parts maintain identical Zener voltage (100 V), impedance (250 Ohms maximum), reverse leakage current (1 µA @ 76 V), and operating temperature range (-65°C to 150°C), ensuring direct functional substitution within the DO-214AA/SMB package class.

Frequently Asked Questions (FAQ)

Q: Can 1SMB5949BT3G directly replace SMBJ5949C/TR13 on a PCB?

A: Yes. Both parts use the DO-214AA/SMB package with identical pin configuration and footprint. No PCB layout modifications are required. The 3 W power rating of the substitute is compatible with circuits designed for 2 W operation.

Q: What is the impact of ±5% tolerance on the substitute parts compared to ±2% on the main part?

A: The main part (SMBJ5949C/TR13) maintains Zener voltage within ±2% of 100 V (98 V to 102 V). Substitute parts maintain voltage within ±5% (95 V to 105 V). For applications requiring precise voltage regulation, the tighter tolerance of the main part is preferred. For general transient protection and voltage clamping, the ±5% tolerance is acceptable.

Q: Is SZ1SMB5949BT3G suitable for non-automotive applications?

A: Yes. SZ1SMB5949BT3G is AEC-Q101 qualified for automotive use but is not restricted to automotive applications. It functions identically to 1SMB5949BT3G in non-automotive circuits. AEC-Q101 qualification indicates additional reliability testing and is not detrimental to general-purpose applications.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on a reel, suitable for automated pick-and-place assembly in high-volume production. Cut Tape (CT) & Digi-Reel packaging provides components on cut tape segments or alternative reel formats, accommodating lower-volume orders and mixed-component assembly. Electrical and mechanical specifications are identical; packaging format affects supply chain logistics only.

Q: Are all three parts suitable for -65°C to 150°C operating temperature range?

A: Yes. All three parts (SMBJ5949C/TR13, 1SMB5949BT3G, and SZ1SMB5949BT3G) operate across the identical temperature range of -65°C to 150°C. No thermal derating or application restrictions apply based on operating temperature differences.

Q: What does ROHS3 compliance mean for the substitute parts?

A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive 3, which restricts the use of specific hazardous materials (lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers) in electrical and electronic equipment. The main part (SMBJ5949C/TR13) is RoHS non-compliant. Both onsemi substitutes are ROHS3 compliant, making them suitable for applications and markets requiring RoHS compliance.

Q: Can the 3 W substitute parts be used in circuits designed for 2 W operation?

A: Yes. The 3 W power rating of substitute parts (1SMB5949BT3G and SZ1SMB5949BT3G) is a maximum specification. Circuits designed for 2 W operation will dissipate the same power regardless of component rating. The higher rating provides additional thermal margin and does not affect circuit performance or component lifespan in 2 W applications.

Q: What is the significance of identical impedance (250 Ohms maximum) across all three parts?

A: Impedance determines the dynamic response of the Zener diode to transient voltage changes. Identical impedance specifications ensure that all three parts provide equivalent transient suppression characteristics and voltage regulation response time. This parameter is critical for applications requiring fast voltage clamping during transient events.