ROHM RPT-37PB3F Data Sheet

Summary

This phototransistor is a highly sensitive silicon planar sensor designed for precise optical detection and control systems. Its features include minimal influence from stray light and optimal performance with infrared LED sources. This technical manual provides comprehensive data sheets, including absolute maximum ratings, electrical/optical characteristics, and usage curves necessary for integration into electronic circuits. It is ideal for engineers and designers working on sensor receivers, automation equipment, or any system requiring reliable optical signal monitoring.

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Phototransistor, top view type RPT-37PB3F The RPT-37PB3F is a silicon planar phototransistor. Since it is molded in plastic with a visible light filter, there is almost no effect from stray light. It is particularly suited for use with a ROHM SIR-34ST3F infrared light emitting diode. It is possible to distinguish the polarity by the shape of ramp type.

Applications Dimensions (Units : mm) Optical control equipment Receiver for sensors φ3.8±0.3

Notes : φ3.1±0.2 1. Unspecfied tolerance shall be ±0.2. 2. Measurement in the bracket are that of lead pin at base the mold. 3. Dimension in parenthesis are show for

Features reference. 1) High sensitivity.

2) Almost no effect from stray light.

2. 5± ax .1 1.

in .2 42− 0.5 5. 2± 0.

Internal connection diagram

Emitter Collector

Absolute maximum ratings (Ta = 25C)

Parameter Symbol Limits Unit

Collector-emitter voltage VCEO

Emitter-collector voltage VECO

Collector current IC m A

Collector power dissipation PC m W

Operating temperature Topr −25~+85 °C

Storage temperature Tstg −30~+85 °C

Electrical and optical characteristics (Ta = 25C)

Parameter Symbol Min. Typ. Max. Unit Conditions

Light current IC 2.0 m A VCE=5V, E=500LX

Dark current ICEO 0.5 μA VCE=10V(Black box)

Peak sensitivity wavelength λP nm

Collector-emitter saturation voltage VCE(sat) 0.4 IC=1m A, E=500LX

Half-angle θ1 / 2 ±36 deg

Response time tr·tf μs VCC=5V, IC=1m A, RL=100Ω

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1/2 2010.07 - Rev.A

Page Summary Contents For ROHM RPT-37PB3F Data Sheet

Page 1 Phototransistor, top view type RPT-37PB3F The RPT-37PB3F is a silicon planar phototransistor. Since it is molded in plastic with a visible light filter, there is almost no effect from stray light. It ...

Page 2 Data Sheet RPT-37PB3F IM tr (μ s) LI IC IC n A Electrical and optical characteristic curves VCE=5V VCE=10V VCE=20V VCE=30V AMBIENT TEMPERATURE : Ta (°C) AMBIENT TEMPERATURE : Ta (°C) ILLUMINANCE : E ...

Page 3 Notice No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without not...

Manual Details

Brand	ROHM
Pages	3
File Size	130.78 KB
Published	July 22, 2026

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Frequently Asked Questions

Which LED is recommended for optimal use with this phototransistor?

It is particularly suited for use with a ROHM SIR-34ST3F infrared light emitting diode.

Is the RPT-37PB3F designed for high-reliability or life-critical applications?

No, it is not meant for systems requiring extremely high reliability, such as medical instruments or aerospace machinery.

What are the specified operating temperature limits for this device?

The operational temperature range (Topr) is stated to be from -25°C to +85°C.