1SMB5937B-13 Equivalent & Substitute Parts

Part Overview

The 1SMB5937B-13 is a Zener diode manufactured by Diodes Incorporated, rated at 33 V nominal voltage with 550 mW maximum power dissipation. This surface mount component in SMB (DO-214AA) package is designed for voltage regulation and protection applications. The part is Active status and ROHS3 compliant. Substitute parts are identified to address application requirements including higher power ratings, alternative packaging formats, and inventory availability across multiple manufacturers.

Substiute Parts

1SMB5937B-13

Diodes IncorporatedIn Stock: 34951SMB5937B-13 Datasheet

Current PartRFQ

1SMB5937BT3G

onsemiIn Stock: 1129521SMB5937BT3G Datasheet

DirectRFQ

3SMBJ5937B-TP

Micro Commercial CoIn Stock: 13183SMBJ5937B-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SMB5937B-13 is determined by the following critical parameters that must remain constant across all equivalent parts:

Fixed Parameters (Non-Negotiable):

• Voltage - Zener (Nom): 33 V
• Tolerance: ±5%
• Impedance (Max): 33 Ohms
• Current - Reverse Leakage @ Vr: 1 µA @ 25.1 V
• Voltage - Forward (Vf) (Max) @ If: 1.5 V @ 200 mA
• Mounting Type: Surface Mount
• Package / Case: DO-214AA, SMB
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Variable Parameters (Allowed to Differ):

• Power - Max: Substitutes may have equal or higher power ratings
• Operating Temperature Range: Substitutes may have equal or wider ranges
• Manufacturer: Different manufacturers permitted
• Packaging Format: Cut Tape, Digi-Reel, or Tape & Reel formats acceptable
• Inventory availability: No impact on electrical compatibility

The identified substitutes maintain all fixed electrical and mechanical parameters while offering alternative power ratings and packaging options.

Parameter Comparison

Engineering Selection Recommendations

1SMB5937BT3G (onsemi): This substitute provides a 3 W power rating compared to the 550 mW of the main part, offering enhanced thermal capability within the same SMB package footprint. All electrical parameters remain identical. Operating temperature range matches the main part at -65°C to 150°C. ROHS3 compliance and MSL 1 rating are maintained. This part is suitable for applications requiring higher power dissipation capacity while maintaining identical voltage regulation characteristics.

3SMBJ5937B-TP (Micro Commercial Co): This manufacturer-recommended substitute also provides 3 W power rating with identical electrical specifications. The operating temperature range is -55°C to 150°C, which is narrower at the lower end compared to the main part. All other parameters including voltage, tolerance, impedance, leakage current, and forward voltage remain constant. ROHS3 compliance and MSL 1 rating are maintained. This part is suitable for applications where the lower temperature limit of -55°C is acceptable.

All three parts share identical zener voltage, tolerance, impedance, leakage characteristics, and forward voltage specifications. Selection between substitutes depends on power dissipation requirements, operating temperature range requirements, and packaging format availability.

Frequently Asked Questions (FAQ)

Q: Can 1SMB5937BT3G replace 1SMB5937B-13 in all applications?

A: Yes, provided the application does not require operation below -55°C. The 1SMB5937BT3G maintains all critical electrical parameters (33 V zener voltage, ±5% tolerance, 33 Ohms impedance, 1 µA reverse leakage, 1.5 V forward voltage) and offers higher power rating (3 W vs. 550 mW). Both are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between the three substitute parts?

A: The primary differences are power rating and operating temperature range. The main part (1SMB5937B-13) is rated 550 mW with -65°C to 150°C range. Both substitutes (1SMB5937BT3G and 3SMBJ5937B-TP) are rated 3 W. The 1SMB5937BT3G maintains the -65°C lower limit, while 3SMBJ5937B-TP has a -55°C lower limit. All other electrical specifications are identical.

Q: Are packaging differences significant between these parts?

A: All three parts use the DO-214AA (SMB) package for surface mount applications. The main difference is the supply format: 1SMB5937B-13 and 3SMBJ5937B-TP are supplied in Tape & Reel (TR), while 1SMB5937BT3G is supplied in Cut Tape (CT) and Digi-Reel® formats. The physical package footprint and land pattern are identical.

Q: Do all substitutes maintain RoHS and REACH compliance?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special moisture handling requirements.

Q: Which substitute should be selected for higher power dissipation applications?

A: Both 1SMB5937BT3G and 3SMBJ5937B-TP provide 3 W rating compared to 550 mW of the main part. Selection between these two depends on the required operating temperature range. Use 1SMB5937BT3G if operation below -55°C is required; use 3SMBJ5937B-TP if -55°C minimum temperature is acceptable.

Q: Are the zener voltage and tolerance specifications identical across all parts?

A: Yes. All three parts are specified at 33 V nominal zener voltage with ±5% tolerance. Impedance (Max) is 33 Ohms for all parts. Reverse leakage current is 1 µA @ 25.1 V for all parts. Forward voltage is 1.5 V @ 200 mA for all parts.