Data Sheet

FODM121 Series, FODM124, FODM2701, FODM2705 — 4-Pin Full Pitch Mini-Flat Package Phototransistor Optocouplers
©2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
FODM121 Series, FODM124, FODM2701, FODM2705 Rev. 1.7
November 2015
FODM121 Series, FODM124, FODM2701,
FODM2705
4-Pin Full Pitch Mini-Flat Package Phototransistor
Optocouplers
Features
• More than 5 mm Creepage/Clearance
• Compact 4-Pin Surface Mount Package
(2.4 mm Maximum Standoff Height)
• Current Transfer Ratio in Selected Groups:
• Safety and Regulatory Approvals:
– UL1577, 3,750 VAC
RMS
for 1 Minute
– DIN-EN/IEC60747-5-5, 565 V Peak Working
Insulation Voltage
Applications
• Digital Logic Inputs
• Microprocessor Inputs
• Power Supply Monitor
• Twisted Pair Line Receiver
• Telephone Line Receiver
Description
The FODM121 series, FODM124, and FODM2701
consists of a gallium arsenide infrared emitting diode
driving a phototransistor in a compact 4-pin mini-flat
package. The lead pitch is 2.54 mm. The FODM2705
consists of two gallium arsenide infrared emitting diodes
connected in inverse parallel for AC operation.
Functional Block Diagram
DC Input:
FODM121: 50–600%
FODM121A: 100–300%
FODM121B: 50–150%
FODM121C: 100–200%
FODM124: 100% MIN
FODM2701: 50–300%
AC Input:
FODM2705: 50–300%
Figure 2. Package Outlines
1
2
4
3
EMITTER
Equivalent Circuit
FODM121, FODM124, FODM2701
Equivalent Circuit
FODM2705
COLLECTORANODE
CATHODE
1
2
4
3
EMITTER
COLLECTORANODE
CATHODE
Figure 1. Schematic