1SMB5931 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMB5931 is an 18 V, 3 W surface mount zener diode manufactured by Taiwan Semiconductor Corporation in the DO-214AA (SMB) package. This component is classified as an active product and is ROHS3 compliant. The 1SMB5931 operates across a temperature range of -55°C to 150°C and features a ±5% voltage tolerance with a maximum impedance of 12 Ohms. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity across multiple manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	18	V
Power - Maximum	3	W
Tolerance	±5	%
Impedance (Maximum)	12	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 13.7 V
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 1SMB5931 are classified into four categories based on electrical and mechanical compatibility:

Parametric Equivalent: Parts that match all critical electrical parameters (18 V nominal zener voltage, 3 W maximum power, ±5% tolerance, 12 Ohms maximum impedance, 1 µA reverse leakage current) and package specifications (DO-214AA SMB surface mount). These parts are direct functional replacements.

Direct Manufacturer Equivalent: Parts from alternative manufacturers that maintain identical electrical specifications and package form factor, enabling cross-manufacturer substitution without design modification.

Upgrade Classification: Parts that retain core electrical parameters but offer extended operating temperature range or enhanced packaging options (Cut Tape and Digi-Reel formats), providing additional procurement flexibility.

Similar Classification: Parts that share the same package and mounting type but differ in one or more electrical parameters (zener voltage, power rating, or leakage current). These parts require circuit-level evaluation for compatibility.

The substitution logic is based strictly on the following parameters: Voltage - Zener (Nominal), Power - Maximum, Tolerance, Impedance (Maximum), Current - Reverse Leakage @ Vr, Operating Temperature Range, Mounting Type, and Package / Case designation.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance (%)	Zzt (Ohms)	Reverse Leakage (µA @ V)	Temp Range (°C)	Package	Classification
1SMB5931	Taiwan Semiconductor Corporation	18	3	±5	12	1 @ 13.7	-55 to 150	DO-214AA SMB	Main Part
1SMB5931H	Taiwan Semiconductor Corporation	18	3	±5	12	1 @ 13.7	-55 to 150	DO-214AA SMB	Parametric Equivalent
3SMBJ5931B-TP	Micro Commercial Co	18	3	±5	12	1 @ 13.7	-55 to 150	DO-214AA SMB	Direct Manufacturer Equivalent
SMBZ5931B-E3/52	Vishay General Semiconductor - Diodes Division	18	3	±5	12	1 @ 13.7	-55 to 150	DO-214AA SMB	Direct Manufacturer Equivalent
1SMB5931BT3G	onsemi	18	3	±5	12	1 @ 13.7	-65 to 150	DO-214AA SMB	Upgrade
SMBJ5356B-TP	Micro Commercial Co	19	5	±5	3	0.5 @ 14.4	-55 to 150	DO-214AA SMB	Similar
SMZJ3795B-E3/52	Vishay General Semiconductor - Diodes Division	18	1.5	±5	12	5 @ 13.7	-55 to 150	DO-214AA SMB	Similar

Engineering Selection Recommendations

Direct Substitution (Parametric Equivalent and Direct Manufacturer Equivalent):

The parts 1SMB5931H, 3SMBJ5931B-TP, and SMBZ5931B-E3/52 are direct functional replacements for the 1SMB5931. All three maintain identical electrical specifications across zener voltage, power rating, tolerance, impedance, reverse leakage current, and operating temperature range. These parts are suitable for immediate substitution without circuit redesign. All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status consistent with the main part.

Upgrade Option:

The 1SMB5931BT3G from onsemi provides an extended lower operating temperature limit (-65°C versus -55°C) while maintaining all other electrical parameters. This part is classified as an upgrade and is available in Cut Tape and Digi-Reel packaging formats, offering enhanced procurement flexibility. The 1SMB5931BT3G is suitable for applications requiring extended low-temperature performance.

Similar Parts (Conditional Substitution):

The SMBJ5356B-TP differs in zener voltage (19 V versus 18 V), power rating (5 W versus 3 W), impedance (3 Ohms versus 12 Ohms), and reverse leakage current (500 nA versus 1 µA). This part is suitable only for applications where the higher voltage and power specifications are acceptable and circuit design permits the voltage deviation.

The SMZJ3795B-E3/52 differs in power rating (1.5 W versus 3 W) and reverse leakage current (5 µA versus 1 µA) while maintaining the 18 V zener voltage and 12 Ohms impedance. This part is suitable only for applications with reduced power dissipation requirements and where the higher leakage current is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I use 1SMB5931H as a direct replacement for 1SMB5931?

A: Yes. The 1SMB5931H is a parametric equivalent with identical electrical specifications (18 V, 3 W, ±5% tolerance, 12 Ohms impedance, 1 µA reverse leakage) and the same DO-214AA SMB package. No circuit modification is required.

Q: What is the difference between the main part 1SMB5931 and the upgrade part 1SMB5931BT3G?

A: The 1SMB5931BT3G extends the lower operating temperature limit to -65°C compared to -55°C on the main part. All other electrical parameters remain identical. The 1SMB5931BT3G is available in Cut Tape and Digi-Reel packaging, whereas the main part is supplied in Tape & Reel format.

Q: Can I substitute SMBJ5356B-TP for 1SMB5931?

A: SMBJ5356B-TP is classified as a similar part, not a direct equivalent. It operates at 19 V (versus 18 V) with 5 W power rating (versus 3 W) and 3 Ohms impedance (versus 12 Ohms). Substitution requires circuit-level evaluation to confirm the higher voltage and power specifications are compatible with the application.

Q: What does the DO-214AA SMB package designation mean?

A: DO-214AA and SMB are equivalent designations for the same surface mount package form factor. All substitute parts listed use this identical package, ensuring mechanical and electrical compatibility on the PCB.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, consistent with the main part 1SMB5931.

Q: Can I use SMZJ3795B-E3/52 in place of 1SMB5931?

A: SMZJ3795B-E3/52 is classified as a similar part. It maintains the 18 V zener voltage and 12 Ohms impedance but has a reduced power rating (1.5 W versus 3 W) and higher reverse leakage current (5 µA versus 1 µA). Substitution is suitable only for applications with lower power dissipation requirements where the increased leakage current is acceptable.

Q: What inventory levels are available for each substitute part?

A: Inventory quantities are as follows: 1SMB5931 (2,240 pcs), 1SMB5931H (3,925 pcs), 3SMBJ5931B-TP (5,780 pcs), SMBZ5931B-E3/52 (4,169 pcs), 1SMB5931BT3G (70,100 pcs), SMBJ5356B-TP (2,893 pcs), SMZJ3795B-E3/52 (5,344 pcs).

Q: Are there any temperature range differences between substitute parts?

A: The 1SMB5931BT3G offers an extended lower temperature limit of -65°C compared to -55°C on all other parts. All parts maintain the upper temperature limit of 150°C.

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