SI3134K-TP N-Channel MOSFET 20V 750mA Equivalent & Substitute Parts

Part Overview

The SI3134K-TP is an N-Channel MOSFET manufactured by Micro Commercial Co, rated for 20V drain-to-source voltage with 750mA continuous drain current in a surface mount SOT-723 package. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original component is no longer readily available or where design flexibility permits component selection from active product lines.

Key Parameters

Parameter	SI3134K-TP
Manufacturer	Micro Commercial Co
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)
Drain-to-Source Voltage (Vdss)	20 V
Continuous Drain Current (Id) @ 25°C	750mA (Tj)
Rds On (Max)	800mOhm @ 450mA, 1.8V
Gate Threshold Voltage (Vgs(th))	1V @ 250µA
Input Capacitance (Ciss)	120 pF @ 16 V
Power Dissipation (Max)	150mW (Ta)
Operating Temperature Range	-55°C ~ 150°C (TJ)
Package Type	SOT-723
Mounting Type	Surface Mount
Product Status	Not For New Designs
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of N-Channel MOSFETs is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Drain-to-Source Voltage (Vdss): Must equal or exceed 20V
Continuous Drain Current (Id): Must meet or exceed 750mA requirement
Package Type: Must be SOT-723 for mechanical and thermal compatibility
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must encompass -55°C to 150°C

Secondary Electrical Parameters:

Gate Threshold Voltage (Vgs(th)): Determines gate drive requirements
On-State Resistance (Rds On): Affects power dissipation and switching losses
Input Capacitance (Ciss): Influences gate drive circuit design
Power Dissipation Rating: Must support thermal requirements

Compliance Parameters:

RoHS Status: Must be ROHS3 Compliant
Moisture Sensitivity Level: Must be MSL 1 or equivalent
REACH Status: Must be REACH Unaffected

The substitute parts listed below meet these mandatory parameters within the allowed electrical and mechanical specifications for this product category.

Parameter Comparison

Parameter	SI3134K-TP	SI3134KA-TP	NTK3043NT5G	NTK3134NT1G
Manufacturer	Micro Commercial Co	Micro Commercial Co	onsemi	onsemi
FET Type	N-Channel	N-Channel	N-Channel	N-Channel
Technology	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)	MOSFET (Metal Oxide)
Drain-to-Source Voltage (Vdss)	20 V	20 V	20 V	20 V
Continuous Drain Current (Id) @ 25°C	750mA (Tj)	750mA (Tj)	210mA (Ta)	750mA (Ta)
Rds On (Max)	800mOhm @ 450mA, 1.8V	300mOhm @ 500mA, 4.5V	3.4Ohm @ 10mA, 4.5V	350mOhm @ 890mA, 4.5V
Gate Threshold Voltage (Vgs(th))	1V @ 250µA	1.1V @ 250µA	1.3V @ 250µA	1.2V @ 250µA
Input Capacitance (Ciss)	120 pF @ 16 V	33 pF @ 16 V	11 pF @ 10 V	120 pF @ 16 V
Power Dissipation (Max)	150mW (Ta)	150W (Tj)	310mW (Ta)	310mW (Ta)
Operating Temperature Range	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Package Type	SOT-723	SOT-723	SOT-723	SOT-723
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Not For New Designs	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SI3134KA-TP (Micro Commercial Co)

The SI3134KA-TP is a direct equivalent from the same manufacturer with Active product status. It maintains identical voltage and current ratings (20V, 750mA) and SOT-723 packaging. The SI3134KA-TP offers improved on-state resistance (300mOhm versus 800mOhm) and reduced input capacitance (33pF versus 120pF), resulting in lower switching losses and reduced gate drive requirements. This part is suitable for direct substitution in new procurement and ongoing production.

NTK3134NT1G (onsemi)

The NTK3134NT1G is an onsemi equivalent with Active product status, matching the 20V/750mA electrical specifications and SOT-723 package. It provides comparable on-state resistance (350mOhm) and identical input capacitance (120pF) to the original SI3134K-TP. The NTK3134NT1G is available in Cut Tape and Digi-Reel packaging options. This part is suitable for direct substitution where onsemi component qualification is acceptable.

NTK3043NT5G (onsemi)

The NTK3043NT5G is an onsemi device with Active product status in SOT-723 packaging. However, it is rated for only 210mA continuous drain current, which is below the 750mA requirement of the SI3134K-TP. This part is not suitable for applications requiring the full 750mA current rating and should only be considered for current-limited applications.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and the required operating temperature range of -55°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can SI3134KA-TP be used as a direct replacement for SI3134K-TP?

A: Yes. The SI3134KA-TP is a direct equivalent from Micro Commercial Co with identical voltage (20V) and current (750mA) ratings in the same SOT-723 package. The SI3134KA-TP has Active product status and improved electrical characteristics, making it suitable for direct substitution.

Q: What is the primary difference between SI3134K-TP and SI3134KA-TP?

A: Both parts share the same voltage and current specifications. The SI3134KA-TP offers lower on-state resistance (300mOhm versus 800mOhm) and reduced input capacitance (33pF versus 120pF), resulting in improved efficiency and reduced gate drive power requirements.

Q: Can NTK3134NT1G replace SI3134K-TP in all applications?

A: Yes, for applications within the specified electrical parameters. The NTK3134NT1G matches the 20V/750mA ratings and SOT-723 package. Verify that onsemi component qualification is acceptable for your application and supply chain requirements.

Q: Why is NTK3043NT5G listed as a substitute if it has lower current rating?

A: The NTK3043NT5G is listed based on the provided substitute list but does not meet the 750mA continuous drain current requirement. It is suitable only for applications with reduced current demands below 210mA and should not be selected for full-specification replacement.

Q: Are all substitute parts available in the same packaging format?

A: SI3134KA-TP and NTK3043NT5G are available in Tape & Reel (TR) packaging. NTK3134NT1G is available in Cut Tape (CT) and Digi-Reel packaging. Verify packaging compatibility with your assembly process requirements.

Q: Do all substitute parts meet RoHS and MSL requirements?

A: Yes. All listed substitute parts are ROHS3 Compliant with MSL 1 (Unlimited) rating, matching the compliance profile of the original SI3134K-TP.

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

A: All substitute parts operate across the same temperature range: -55°C to 150°C (TJ), matching the original SI3134K-TP specification.

Q: How do gate threshold voltage differences affect circuit design?

A: Gate threshold voltage (Vgs(th)) ranges from 1V to 1.3V across the substitute parts. Verify that your gate drive voltage is sufficient to fully enhance the selected device. Lower threshold voltages (SI3134K-TP at 1V) require less gate drive voltage, while higher values (NTK3043NT5G at 1.3V) may require increased drive voltage for full on-state performance.

Q: What impact do input capacitance differences have on switching performance?

A: Input capacitance (Ciss) ranges from 11pF to 120pF. Lower capacitance (NTK3043NT5G at 11pF) reduces gate charge requirements and switching losses. Higher capacitance (SI3134K-TP and NTK3134NT1G at 120pF) increases gate drive power but may provide improved noise immunity in certain circuit topologies.

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