2SA1037-R-TP Equivalent & Substitute Parts Reference

Part Overview

The Micro Commercial Co 2SA1037-R-TP is a surface mount bipolar (BJT) PNP transistor in the SOT-23 package. It features a maximum collector-emitter voltage of 50 V, collector current up to 150 mA, and a power rating of 200 mW. The part is classified as active and currently available. Selecting alternative models is essential to address inventory constraints, reduce lead times, and achieve supply chain flexibility for designs requiring matched electrical and mechanical parameters.

Key Parameters

Manufacturer Part Number	Manufacturer	Part Status	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	Power - Max	Frequency - Transition	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS/REACH Status	ECCN	HTSUS
2SA1037-R-TP	Micro Commercial Co	Active	PNP	50 V	150 mA	120 @ 1mA, 6V	500mV @ 5mA, 5mA	100nA (ICBO)	200 mW	120MHz	150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	REACH Unaffected	EAR99	8541.21.0075

Substitute Part Grouping Explanation

Substitute components are selected strictly based on matching or closely comparable core electrical and mechanical parameters. These parameters include transistor type, maximum collector-emitter voltage, maximum collector current, minimum DC current gain, saturation voltage, cutoff current, power rating, transition frequency, operating temperature, mounting type, and package outline. Substitution is limited to parts in the same package and with compatible specifications, ensuring functional and form-factor equivalency.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Part Status	Transistor Type	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max)	Power - Max	Frequency - Transition	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package	RoHS/REACH Status	ECCN	HTSUS
2SA1037-R-TP	Micro Commercial Co	Active	PNP	50 V	150 mA	120 @ 1mA, 6V	500mV @ 5mA, 5mA	100nA (ICBO)	200 mW	120MHz	150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	REACH Unaffected	EAR99	8541.21.0075
2SA1037AKT146Q	Rohm Semiconductor	Active	PNP	50 V	150 mA	120 @ 1mA, 6V	500mV @ 5mA, 50mA	100nA (ICBO)	200 mW	140MHz	150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SMT3	RoHS3/REACH Unaffected	EAR99	8541.21.0075
2SA1037AKT146R	Rohm Semiconductor	Active	PNP	50 V	150 mA	180 @ 1mA, 6V	500mV @ 5mA, 50mA	100nA (ICBO)	200 mW	140MHz	150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SMT3	RoHS3/REACH Unaffected	EAR99	8541.21.0075
BC857A RFG	Taiwan Semiconductor Corporation	Active	PNP	45 V	100 mA	125 @ 2mA, 5V	650mV @ 5mA, 100mA	100nA (ICBO)	200 mW	100MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	RoHS3/REACH Unaffected	EAR99	8541.21.0075
BC857B RFG	Taiwan Semiconductor Corporation	Active	PNP	45 V	100 mA	220 @ 2mA, 5V	650mV @ 5mA, 100mA	100nA (ICBO)	200 mW	100MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	RoHS3/REACH Unaffected	EAR99	8541.21.0075
BC857C RFG	Taiwan Semiconductor Corporation	Active	PNP	45 V	100 mA	420 @ 2mA, 5V	650mV @ 5mA, 100mA	100nA (ICBO)	200 mW	100MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	RoHS3/REACH Unaffected	EAR99	8541.21.0075
MMBT3906 RFG	Taiwan Semiconductor Corporation	Active	PNP	40 V	200 mA	100 @ 10mA, 1V	400mV @ 5mA, 50mA	100nA (ICBO)	350 mW	250MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	RoHS3/REACH Unaffected	EAR99	8541.21.0075
MMBT3906L RFG	Taiwan Semiconductor Corporation	Obsolete	PNP	40 V	200 mA	100 @ 10mA, 1V	400mV @ 5mA, 50mA	100nA (ICBO)	350 mW	250MHz	-55°C ~ 150°C (TJ)	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23	RoHS3/REACH Unaffected	EAR99	8541.21.0075

Engineering Selection Recommendations

Based solely on product status, compliance, and provided certifications, prioritize active substitute parts for replacement. All listed substitutes hold RoHS and REACH unaffected statuses, and are classified under ECCN EAR99 and HTSUS 8541.21.0075, supporting use in regulated applications. Obsolete substitute options, such as MMBT3906L RFG, should only be selected for legacy systems where inventory exists.

Frequently Asked Questions (FAQ)

Q1: What are the primary substitution criteria for 2SA1037-R-TP?
A1: Substitution is determined by matching transistor type, maximum collector-emitter voltage, maximum collector current, DC current gain, saturation voltage, cutoff current, power rating, transition frequency, operating temperature, and package compatibility.

Q2: Are all listed substitutes in the same package as 2SA1037-R-TP?
A2: All listed substitutes feature surface mount package options compatible with TO-236-3, SC-59, SOT-23-3 outlines.

Q3: How does DC current gain affect substitution?
A3: DC current gain (hFE) at specified Ic and Vce values must meet or exceed application requirements. Substitute parts list their hFE conditions for direct comparison.

Q4: Should obsolete parts be used in new designs?
A4: Use only active parts for new designs. Obsolete substitutes, such as MMBT3906L RFG, are suitable for maintenance where existing inventory is confirmed.

Q5: Are all substitute transistor types PNP?
A5: Yes. Only PNP bipolar (BJT) transistors are included per substitution criteria.

Q6: Are compliance and certifications matched for substitutes?
A6: All substitutes are RoHS compliant and REACH unaffected, suitable for lead-free and environmentally regulated applications.

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