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HM238 
Photo Module for PCM Remote Control Systems
Description
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The HM238 is miniaturized receiver for infrared remote control
systems. PIN diode and preamplifier are assembled on lead frame,
the epoxy package is designed as IR filter.
The demodulated output signal can directly be decoded by a
microprocessor. The main benefit is the reliable function even in
disturbed ambient and the protection against uncontrolled output
pulses.
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E Features
Special
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Photo detector and Preamplifier in one package D
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Internal filter for PCM frequency
disturbance light
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Features
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●
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● TTL and CMOS compatibility
● No occurrence of disturbance pulses at
● Output active low
the output
● Low power consumption0.35mA3V
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● Suitable burst length ≥10 cycles/burst
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● Lead-Free component in accordance with RoHS directives
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Applications
TV, VTR, Acoustic Devices, Air Conditioner, Car Stereo Units, Computers, Interior controlling appliances, and all
appliances that require remote controlling
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Block Diagram
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Rev. A1.2
01-SEP-11
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1／3
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HM238 
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Application Circuit
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*) recommended to suppress power supply disturbance
Absolute Maximum Ratings
Tamb = 25 ℃
Parameter
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Test Conditions
Symbol
Value
Unit
Supply Voltage
(Pin 3)
Vs
6.0
V
Supply Current
(Pin 3)
Is
5
mA
Output Voltage
(Pin 1)
Vo
6.0
V
Tstg
-30…+105
℃
Tamb
-25…+85
(Tamb ≦ 85 ℃)
ptot
10
t≦ 5s
Tsd
260±5
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Storage Temperature
T Range
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Operating
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Power Consumption
Soldering Temperature
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℃
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℃
Basic Characteristics
Tamb = 25 ℃
Parameter
Symbol
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Vs
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Test Conditions
Supply Current (Pin3)
Vs = 5V, Ev = 0
Supply Voltage (Pin3)
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IR diode HK205, I = 400 mA
Transmission Distance
Output Voltage High (Pin1)
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Level Output Pulse Width
A
TWidth
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Level Output O
Pulse
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Carrier frequency
Output Voltage Low (Pin1)
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Rev. A1.2
Max
Unit
0.25
0.5
0.9
mA
5.5
V
2.5
20
m
Vs = 5V
Cycle 1.2mS , 50% duty
VOH
4.5
V
Burst Wave= 600μs ,
Cycle 1.2mS , 50% duty
TWH
TWL
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Angle of half transmission distance
01-SEP-11
Typ
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Peak Wavelength
Directivity
Min
mV
400
800
μs
400
800
μs
fo
37.9
λ
940
φ1/2
±45
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250
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kHz
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nm
deg
2／3
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Package Outline
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HM238 
Dimensions in mm: tolerance±0.3mm
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Rev. A1.2
01-SEP-11
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3／3