1SMA5939 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA5939 is a surface mount silicon zener diode rated at 39 V nominal voltage with 1.5 W maximum power dissipation. Manufactured by Taiwan Semiconductor Corporation, this component is packaged in DO-214AC (SMA) format and is compliant with RoHS3 and REACH standards. The part maintains Active product status with 1140 units in current inventory.

Substitute parts are identified when equivalent electrical performance can be achieved through alternative manufacturers while maintaining the same zener voltage, tolerance, package type, and operating temperature range. Substitution becomes necessary due to supply chain availability, lead time requirements, or inventory management across multiple sourcing channels.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Tolerance	±5%	%
Power - Max	1.5	W
Impedance (Max)	45	Ohms
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 1SMA5939 are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalent Classification: Parts that maintain identical zener voltage (39 V), tolerance (±5%), power rating (1.5 W), impedance (45 Ohms maximum), operating temperature range (-55°C to 150°C), and package format (DO-214AC/SMA). These parts are direct functional equivalents from alternative manufacturers.

Higher Power Rating Classification: Parts that maintain identical zener voltage (39 V), tolerance (±5%), impedance (45 Ohms maximum), and operating temperature range, but feature increased power dissipation capability (3 W versus 1.5 W). These parts are compatible in applications where the original power rating is not a limiting constraint.

All substitute parts must satisfy the following criteria:

Zener voltage: 39 V nominal
Voltage tolerance: ±5%
Package type: DO-214AC (SMA) surface mount
Operating temperature: -55°C to 150°C
RoHS3 compliance
Moisture Sensitivity Level: 1 (Unlimited)

Parameter Comparison

Parameter	1SMA5939 (TSC)	1SMA5939_R1_00001 (Panjit)	3SMAJ5939B-TP (MCC)
Manufacturer	Taiwan Semiconductor Corporation	Panjit International Inc.	Micro Commercial Co
Voltage - Zener (Nom)	39 V	39 V	39 V
Tolerance	±5%	±5%	±5%
Power - Max	1.5 W	1.5 W	3 W
Impedance (Max)	45 Ohms	45 Ohms	45 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 29.7 V	1 µA @ 29.7 V	1 µA @ 29.7 V
Operating Temperature	-55°C to 150°C	-55°C to 150°C	-55°C to 150°C
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Tape & Reel (TR)	Tape & Reel (TR)	Cut Tape (CT)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

1SMA5939_R1_00001 (Panjit International Inc.): This part is a parametric equivalent to the primary 1SMA5939 component. It maintains identical electrical specifications including 39 V zener voltage, ±5% tolerance, 1.5 W power rating, and 45 Ohms maximum impedance. Both parts are supplied in Tape & Reel packaging and hold Active product status with RoHS3 compliance. The Panjit variant is suitable for direct substitution in applications where the original 1.5 W power rating is specified and packaging format is not a constraint. Current inventory of 2464 units supports sustained supply.

3SMAJ5939B-TP (Micro Commercial Co): This part maintains the same zener voltage (39 V), tolerance (±5%), impedance (45 Ohms), and operating temperature range as the primary component. The key distinction is the increased power dissipation rating of 3 W compared to 1.5 W. This part is supplied in Cut Tape packaging rather than Tape & Reel format. The 3SMAJ5939B-TP is suitable for applications where higher power dissipation capability is beneficial or where the original 1.5 W rating may be marginal. All parts maintain RoHS3 compliance and Active product status. Current inventory of 5300 units provides extended availability.

Selection between substitute parts should be based on packaging format requirements (Tape & Reel versus Cut Tape), power dissipation margin requirements, and supply chain lead time considerations. All three parts are electrically compatible within the specified parameter tolerances.

Frequently Asked Questions (FAQ)

Q: Can the 1SMA5939_R1_00001 be used as a direct replacement for the 1SMA5939?

A: Yes. The 1SMA5939_R1_00001 manufactured by Panjit International Inc. is a parametric equivalent. Both parts share identical zener voltage (39 V), tolerance (±5%), power rating (1.5 W), impedance (45 Ohms maximum), operating temperature range (-55°C to 150°C), and DO-214AC (SMA) package format. Both are supplied in Tape & Reel packaging and maintain RoHS3 compliance.

Q: What is the difference between the 1SMA5939 and the 3SMAJ5939B-TP?

A: The primary difference is power dissipation capability. The 1SMA5939 is rated at 1.5 W maximum power, while the 3SMAJ5939B-TP is rated at 3 W maximum power. Both maintain the same 39 V zener voltage, ±5% tolerance, 45 Ohms impedance, and operating temperature range. The 3SMAJ5939B-TP is supplied in Cut Tape packaging format, whereas the 1SMA5939 is supplied in Tape & Reel format.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 1SMA5939, 1SMA5939_R1_00001, and 3SMAJ5939B-TP are all RoHS3 compliant and REACH unaffected. All parts maintain Moisture Sensitivity Level 1 (Unlimited).

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel (TR) and Cut Tape (CT) packaging formats do not affect electrical performance. The choice between formats is determined by assembly process requirements and handling procedures. Tape & Reel packaging is typically used for automated high-volume assembly, while Cut Tape is used for lower-volume or manual assembly operations.

Q: Can the 3SMAJ5939B-TP be used in place of the 1SMA5939 in all applications?

A: The 3SMAJ5939B-TP can be used in applications where the original 1.5 W power rating is not exceeded. The higher 3 W power rating provides additional thermal margin. However, circuit design parameters such as current limiting resistors and thermal management should be verified to ensure compatibility with the specific application requirements.

Q: What is the reverse leakage current difference between the parts?

A: The 1SMA5939 specifies 500 nA maximum reverse leakage at 29.7 V, while both the 1SMA5939_R1_00001 and 3SMAJ5939B-TP specify 1 µA maximum reverse leakage at 29.7 V. This difference is within acceptable tolerance for most applications but should be considered in high-impedance circuit designs where leakage current is a critical parameter.

Q: What is the operating temperature range for all substitute parts?

A: All three parts operate across the temperature range of -55°C to 150°C (junction temperature). This range is identical across the 1SMA5939, 1SMA5939_R1_00001, and 3SMAJ5939B-TP.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message