1SMA4739 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4739 is a surface mount zener diode manufactured by Taiwan Semiconductor Corporation, rated at 9.1 V nominal zener voltage with 1 W maximum power dissipation in a DO-214AC (SMA) package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications including zener voltage, tolerance, power rating, and package configuration. Alternative sources and higher power variants are available to support design flexibility, inventory optimization, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	9.1	V
Tolerance	±5%	%
Power - Max	1	W
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 7 V
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-214AC (SMA)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 1SMA4739 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage (Vz): 9.1 V nominal
Voltage tolerance: ±5%
Package type: DO-214AC (SMA) surface mount
Reverse leakage current: 5 µA @ 7 V
RoHS3 compliance and MSL Level 1 rating

Substitution Categories:

Category 1: Direct Equivalent (Identical Specifications) The SMAZ9V1-TP from Micro Commercial Co matches the 1SMA4739 across all critical electrical parameters including 9.1 V zener voltage, 1 W power rating, ±5% tolerance, and DO-214AC package. This part is suitable for direct replacement in applications requiring identical performance characteristics.

Category 2: Higher Power Variant (Electrical Compatibility with Enhanced Capability) The 3SMAJ5924B-TP from Micro Commercial Co maintains the same 9.1 V zener voltage, ±5% tolerance, and DO-214AC package but provides 3 W maximum power dissipation. This variant is electrically compatible and may be substituted in applications where increased thermal headroom or higher power handling is beneficial, provided circuit board layout and thermal management accommodate the enhanced power rating.

Parameter Comparison

Parameter	1SMA4739 (Main)	SMAZ9V1-TP	3SMAJ5924B-TP
Manufacturer	Taiwan Semiconductor Corporation	Micro Commercial Co	Micro Commercial Co
Voltage - Zener (Nom)	9.1 V	9.1 V	9.1 V
Tolerance	±5%	±5%	±5%
Power - Max	1 W	1 W	3 W
Impedance (Max)	5 Ohms	4 Ohms	4 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 7 V	5 µA @ 7 V	5 µA @ 7 V
Operating Temperature Range	-55 to 175°C	-65 to 150°C	-55 to 150°C
Package / Case	DO-214AC (SMA)	DO-214AC (SMA)	DO-214AC (SMA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement Applications: Select SMAZ9V1-TP when sourcing from Micro Commercial Co is preferred or when the original 1SMA4739 is unavailable. This part provides identical electrical performance and package configuration with full ROHS3 compliance and MSL Level 1 rating.

For Enhanced Thermal Performance: Select 3SMAJ5924B-TP when circuit design permits higher power dissipation capability or when thermal margin improvement is required. The 3 W rating provides additional headroom while maintaining the same zener voltage and package footprint. Verify that PCB thermal design and component placement accommodate the higher power rating.

Compliance Verification: All substitute parts listed maintain ROHS3 compliance, REACH unaffected status, and MSL Level 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAZ9V1-TP be used as a direct replacement for 1SMA4739? A: Yes. SMAZ9V1-TP provides identical zener voltage (9.1 V), tolerance (±5%), power rating (1 W), and DO-214AC package configuration. Both parts are ROHS3 compliant with MSL Level 1 rating.

Q: What is the primary difference between 1SMA4739 and 3SMAJ5924B-TP? A: The 3SMAJ5924B-TP has a higher maximum power rating of 3 W compared to the 1 W rating of 1SMA4739. All other electrical parameters including zener voltage, tolerance, and reverse leakage current remain identical. The package and mounting type are the same.

Q: Can 3SMAJ5924B-TP be substituted in a circuit designed for 1SMA4739? A: Yes, provided the circuit board layout and thermal management design accommodate the higher power dissipation capability. The electrical characteristics are compatible, and the DO-214AC package footprint is identical.

Q: Are there temperature range differences between substitute parts? A: Yes. The 1SMA4739 operates from -55°C to 175°C, while SMAZ9V1-TP operates from -65°C to 150°C, and 3SMAJ5924B-TP operates from -55°C to 150°C. Verify that the selected substitute meets the application's temperature requirements.

Q: What packaging format is available for these zener diodes? A: All listed parts use DO-214AC (SMA) surface mount package. SMAZ9V1-TP and 3SMAJ5924B-TP are supplied in Tape & Reel (TR) format for automated assembly.

Q: Are all substitute parts RoHS compliant? A: Yes. All parts listed are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating and REACH unaffected status.

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