1SMB5938 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMB5938 is a 36 V, 3 W surface mount zener diode manufactured by Taiwan Semiconductor Corporation in DO-214AA (SMB) package. This component is classified as an active product and is RoHS3 compliant. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage circuits. Substitute parts are identified when equivalent electrical characteristics, mechanical compatibility, and regulatory compliance are maintained across different manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	36	V
Power - Maximum	3	W
Tolerance	±5	%
Impedance (Maximum)	38	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 27.4 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55°C to 150°C	TJ
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of zener diodes is determined by matching the following critical parameters:

Voltage - Zener (Nominal): Must be 36 V
Power - Maximum: Must be 3 W
Tolerance: Must be ±5%
Impedance (Maximum): Must be 38 Ohms
Current - Reverse Leakage @ Vr: Must be 1 µA @ 27.4 V
Package / Case: Must be DO-214AA or SMB compatible
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must support -55°C to 150°C minimum
RoHS Status: Must be ROHS3 Compliant
Moisture Sensitivity Level: Must be MSL 1 or equivalent

All identified substitute parts meet these criteria across multiple manufacturers, ensuring functional and mechanical interchangeability within the specified electrical and environmental constraints.

Parameter Comparison

Parameter	1SMB5938 (TSC)	3SMBJ5938B-TP (MCC)	SMBZ5938B-E3/52 (Vishay)	1SMB5938BT3G (onsemi)
Voltage - Zener (Nom)	36 V	36 V	36 V	36 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	3 W	3 W	3 W	3 W
Impedance (Max)	38 Ohms	38 Ohms	38 Ohms	38 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 27.4 V	1 µA @ 27.4 V	1 µA @ 27.4 V	1 µA @ 27.4 V
Voltage - Forward (Vf) (Max) @ If	Not specified	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain full electrical and mechanical compatibility with the 1SMB5938. Selection among these alternatives is based on the following factors:

3SMBJ5938B-TP (Micro Commercial Co): Direct equivalent with identical electrical specifications and operating temperature range. Suitable for applications requiring standard Tape & Reel packaging with 1533 units in stock.

SMBZ5938B-E3/52 (Vishay General Semiconductor - Diodes Division): Direct equivalent with identical electrical specifications and operating temperature range. Highest inventory availability at 3000 units in stock. Supplier device package designation is DO-214AA (SMBJ).

1SMB5938BT3G (onsemi): Upgrade option with extended lower operating temperature limit (-65°C versus -55°C). Identical electrical specifications and RoHS3 compliance. Highest inventory availability at 80,200 units in stock. Packaging available in Cut Tape (CT) and Digi-Reel® format.

All parts are active products with ROHS3 compliance, MSL 1 rating, and REACH unaffected status. Selection should be based on packaging requirements, inventory availability, and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can 1SMB5938 be replaced with 3SMBJ5938B-TP?

A: Yes. Both parts share identical zener voltage (36 V), power rating (3 W), tolerance (±5%), impedance (38 Ohms), reverse leakage current (1 µA @ 27.4 V), operating temperature range (-55°C to 150°C), and package type (DO-214AA, SMB). Both are RoHS3 compliant with MSL 1 rating.

Q: What is the difference between SMBZ5938B-E3/52 and 1SMB5938?

A: Electrical specifications are identical. The primary difference is the manufacturer (Vishay versus Taiwan Semiconductor Corporation). Both use DO-214AA/SMB packaging and are surface mount components with identical operating temperature ranges and compliance certifications.

Q: Is 1SMB5938BT3G a direct substitute or an upgrade?

A: 1SMB5938BT3G is classified as an upgrade option. It maintains all electrical specifications identical to 1SMB5938 but extends the lower operating temperature limit to -65°C (compared to -55°C). This provides enhanced performance in low-temperature environments while maintaining full backward compatibility.

Q: Are there packaging differences between these substitute parts?

A: 1SMB5938, 3SMBJ5938B-TP, and SMBZ5938B-E3/52 are supplied in Tape & Reel (TR) format. 1SMB5938BT3G is available in Cut Tape (CT) and Digi-Reel® format. All use the same DO-214AA/SMB package case for PCB mounting.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. All listed substitute parts (3SMBJ5938B-TP, SMBZ5938B-E3/52, and 1SMB5938BT3G) are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level and REACH unaffected status, matching the compliance profile of the 1SMB5938.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided the PCB layout accommodates the DO-214AA/SMB package footprint and the design does not require the extended temperature range of 1SMB5938BT3G. All parts are surface mount components with identical electrical performance within the specified operating temperature ranges.

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