1SMA4747 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA4747 is a 20 V, 1 W Zener diode manufactured by SMC Diode Solutions in Surface Mount SMA (DO-214AC) packaging. This component is designed for voltage regulation and protection applications requiring a nominal Zener voltage of 20 V with ±5% tolerance. The part is currently Active in product status with 8950 pieces available in inventory. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±5	%
Power - Max	1	W
Impedance (Max)	22	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 15.2 V
Voltage - Forward (Vf) (Max)	1.2	V
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 1SMA4747 are identified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Matching Criteria:

Voltage - Zener (Nom): 20 V
Tolerance: ±5%
Power - Max: 1 W
Impedance (Max): 22 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 15.2 V
Operating Temperature Range: -65°C to 150°C

Mechanical Matching Criteria:

Mounting Type: Surface Mount
Package / Case: DO-214AC (SMA)

Compliance Matching Criteria:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

The substitute part SMAJ4747A-TP manufactured by Micro Commercial Co meets all electrical and mechanical parameters specified above, enabling direct substitution in applications requiring a 20 V, 1 W Zener diode in SMA packaging.

Parameter Comparison

Parameter	1SMA4747 (SMC)	SMAJ4747A-TP (Micro Commercial Co)	Match Status
Voltage - Zener (Nom)	20 V	20 V	Identical
Tolerance	±5%	±5%	Identical
Power - Max	1 W	1 W	Identical
Impedance (Max)	22 Ohms	22 Ohms	Identical
Current - Reverse Leakage @ Vr	5 µA @ 15.2 V	5 µA @ 15.2 V	Identical
Voltage - Forward (Vf) (Max)	1.2 V @ 200 mA	1.2 V @ 100 mA	Compatible
Operating Temperature Range	-65°C to 150°C	-65°C to 150°C	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	DO-214AC, SMA	DO-214AC, SMA	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical

Engineering Selection Recommendations

Primary Part: 1SMA4747 (SMC Diode Solutions)

The 1SMA4747 is the specified component with Active product status and ROHS3 compliance. This part is suitable for new designs and ongoing production applications. Current inventory of 8950 pieces supports immediate procurement requirements.

Substitute Part: SMAJ4747A-TP (Micro Commercial Co)

The SMAJ4747A-TP is a parametric equivalent with Active product status and ROHS3 compliance. This substitute part is suitable for applications where supply continuity is required or when the primary part is unavailable. The substitute maintains identical electrical performance across all critical parameters and is compatible with the same PCB footprint and assembly processes. Current inventory of 31069 pieces provides extended availability.

Both parts are compliant with RoHS3 regulations and carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4747A-TP be used as a direct replacement for 1SMA4747?

A: Yes. The SMAJ4747A-TP meets all electrical specifications (20 V nominal Zener voltage, ±5% tolerance, 1 W maximum power, 22 Ohms maximum impedance) and mechanical requirements (DO-214AC SMA package, Surface Mount) of the 1SMA4747. Both parts are ROHS3 compliant with identical operating temperature ranges and moisture sensitivity levels.

Q: Are there differences in forward voltage specifications between these parts?

A: The forward voltage maximum is specified at different current levels: 1SMA4747 at 200 mA and SMAJ4747A-TP at 100 mA. Both maintain the same 1.2 V maximum specification at their respective test currents, ensuring compatible performance in voltage regulation and protection circuits.

Q: Do both parts use the same package footprint?

A: Yes. Both the 1SMA4747 and SMAJ4747A-TP use the DO-214AC (SMA) Surface Mount package, enabling direct PCB footprint compatibility without layout modifications.

Q: What is the operating temperature range for these Zener diodes?

A: Both parts operate across the temperature range of -65°C to 150°C, supporting applications in standard industrial and extended temperature environments.

Q: Are special handling procedures required for these components?

A: No. Both parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity precautions are required during storage, handling, or assembly processes.

Q: Which part should be selected for new designs?

A: Selection between 1SMA4747 and SMAJ4747A-TP is based on supplier availability and procurement strategy. Both parts are functionally equivalent and suitable for new designs. The choice may be influenced by inventory levels, lead times, or established supplier relationships.

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