Equivalent & Substitute Parts Reference: 2SA1837(PAIO,F,M)

Part Overview

The 2SA1837(PAIO,F,M) is a PNP bipolar junction transistor (BJT) from Toshiba Semiconductor and Storage, categorized under Transistors, Bipolar (BJT). It features a maximum collector-emitter voltage of 230 V, a collector current rating of 1 A, and is provided in a TO-220-3 Full Pack package for through-hole mounting. With a product status of "Obsolete," it is essential for engineers and technicians to identify functionally compatible alternative models for direct replacement in applications or ongoing production.

Key Parameters

Parameter	2SA1837(PAIO,F,M) Value
Transistor Type	PNP
Current - Collector (Ic) (Max)	1 A
Voltage - Collector Emitter Breakdown (Max)	230 V
Vce Saturation (Max) @ Ib, Ic	1.5V @ 50mA, 500mA
Current - Collector Cutoff (Max) (ICBO)	1µA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 100mA, 5V
Power - Max	2 W
Frequency - Transition	70MHz
Operating Temperature	150°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3 Full Pack

Substitute Part Grouping Explanation

Substitute parts must have matching transistor type (PNP), a suitable collector-emitter voltage (Vce), appropriate maximum collector current (Ic), similar mounting type, and package compatibility (TO-220 variant). Only those components whose technical specifications, electrical ratings, and mechanical features strictly correspond with the above key parameters are referenced as substitutes.

Parameter Comparison

Parameter	2SA1837(PAIO,F,M)	2SA1668
Transistor Type	PNP	PNP
Current - Collector (Ic) (Max)	1 A	2 A
Voltage - Collector Emitter Breakdown (Max)	230 V	200 V
Vce Saturation (Max) @ Ib, Ic	1.5V @ 50mA, 500mA	1V @ 70mA, 700mA
Current - Collector Cutoff (Max) (ICBO)	1µA	10µA
DC Current Gain (hFE) (Min)	100 @ 100mA, 5V	60 @ 700mA, 10V
Power - Max	2 W	25 W
Frequency - Transition	70MHz	20MHz
Operating Temperature	150°C (TJ)	150°C (TJ)
Mounting Type	Through Hole	Through Hole
Package / Case	TO-220-3 Full Pack	TO-220-3 Full Pack

Engineering Selection Recommendations

The 2SA1837(PAIO,F,M) has an obsolete product status. The referenced substitute, 2SA1668, is listed with an "Active" product status and ROHS3 compliance. Both meet the specified Moisture Sensitivity Level (MSL 1, Unlimited), ECCN, and mounting and package configurations within the provided parameters. Selection for substitution is based strictly on product lifecycle status and compliance data as given.

Frequently Asked Questions (FAQ)

Q1: What are the primary criteria for substituting the 2SA1837(PAIO,F,M)?
A1: Key criteria include matching transistor type, package (TO-220-3 Full Pack), through-hole mounting, collector-emitter voltage rating, collector current rating, and environmental ratings provided.

Q2: Does the substitute 2SA1668 fit the same mounting and package requirements as the 2SA1837(PAIO,F,M)?
A2: Yes, both transistors feature a TO-220-3 Full Pack package and are designed for through-hole mounting.

Q3: Are there differences in electrical ratings to consider between the two transistors?
A3: The substitute offers a higher collector current and power rating, and a lower collector-emitter breakdown voltage, as presented in the parameters.

Q4: How is product status relevant for selection?
A4: The obsolete status of the 2SA1837(PAIO,F,M) necessitates the use of an alternative part with an active status for ongoing availability.

Q5: What compliance certifications are provided in the substitute?
A5: The 2SA1668 is designated as ROHS3 Compliant and has a Moisture Sensitivity Level (MSL) of 1 (Unlimited), consistent with the original part’s data.

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