A1458 Optocoupler Datasheet [ TOP-RATED ]
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Many A1458 variants carry UL 1577, VDE 0884 (reinforced insulation), and CSA approvals. Always check the specific datasheet for regulatory marks if your design requires safety certification. Part 7: Typical Application Circuits (From Datasheet Examples) The A1458 optocoupler datasheet often includes reference circuits. Here are two common ones. Circuit 1: Digital Logic Isolation (High → Low) Scenario: Isolating a 24V PLC output to a 3.3V microcontroller input.
The forward voltage drop of 1.2V-1.6V is typical for GaAs IR LEDs. When calculating current-limiting resistors for microcontroller outputs (e.g., 5V logic), use R = (V_OH - V_F) / I_F, where I_F is typically 5-20 mA. Output (Phototransistor) Characteristics | Parameter | Symbol | Conditions | Min | Typ | Max | Unit | |-----------|--------|-------------|-----|-----|-----|------| | Collector-Electron Breakdown | BV_CEO | I_C = 100 μA, I_F = 0 | 80 | - | - | V | | Emitter-Collector Breakdown | BV_ECO | I_E = 100 μA | 6 | - | - | V | | Dark Current (Leakage) | I_CEO | V_CE = 20V, I_F = 0, Ta=25°C | - | 10 | 100 | nA | | Dark Current at 100°C | I_CEO | V_CE = 20V, I_F = 0, Ta=100°C | - | 1 | 10 | μA |
Inside the package, pin 1 connects to the LED’s anode, pin 2 to its cathode. The phototransistor sits with its collector on pin 4 and emitter on pin 3. There is no base pin exposed; base current is generated solely by illumination. a1458 optocoupler datasheet
For digital logic interfaces (e.g., 5V to 3.3V), ranks A or B are sufficient. For analog applications or low I_F drive (e.g., 1 mA from a battery-powered MCU), ranks C or D provide higher sensitivity. Part 5: Switching Characteristics (Speed) The A1458 is not an ultra-high-speed device (like a logic gate optocoupler, e.g., 6N137), but it is adequate for most power supply feedback and low-speed data isolation (< 50 kHz).
| Rank | CTR Min (%) | CTR Max (%) | Conditions | |------|-------------|-------------|-------------| | A | 50 | 150 | I_F = 5 mA, V_CE = 5V, Ta=25°C | | B | 80 | 240 | I_F = 5 mA, V_CE = 5V, Ta=25°C | | C | 130 | 400 | I_F = 5 mA, V_CE = 5V, Ta=25°C | | D | 200 | 600 | I_F = 5 mA, V_CE = 5V, Ta=25°C | Many A1458 variants carry UL 1577, VDE 0884
Introduction In the world of electronics, isolation is paramount. Whether you are designing a switch-mode power supply (SMPS), a microcontroller interface for industrial machinery, or a safety system for a medical device, the optocoupler (also known as an opto-isolator) is a critical component. Among the myriad of options available, the A1458 optocoupler has gained recognition for its balance of speed, current transfer ratio (CTR), and isolation voltage.
| Model | CTR (%) | V_CEO (V) | t_on/t_off (μs) | Isolation (Vrms) | Best For | |-------|---------|-----------|-----------------|------------------|-----------| | | 50-600 | 80 | 5/4 | 5,000 | General purpose, wide CTR | | PC817 | 50-600 | 35 | 4/3 | 5,000 | SMPS feedback (lower V_CEO) | | 4N35 | 100 (min) | 30 | 10/10 | 5,000 | Hobbyist, older designs | | 6N137 | - (logic) | 7 | 0.075 | 5,000 | High-speed data (10 Mbps) | Here are two common ones
| Parameter | Symbol | Conditions | Value | Unit | |-----------|--------|-------------|-------|------| | Isolation Voltage | V_ISO | Ta=25°C, 60Hz, 1 sec | 5,000 | Vrms | | Isolation Resistance | R_IO | V_IO = 500V | 10^12 (min) | Ω | | Isolation Capacitance | C_IO | V_IO = 0V, f=1MHz | 0.8 (typ) | pF |
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Many A1458 variants carry UL 1577, VDE 0884 (reinforced insulation), and CSA approvals. Always check the specific datasheet for regulatory marks if your design requires safety certification. Part 7: Typical Application Circuits (From Datasheet Examples) The A1458 optocoupler datasheet often includes reference circuits. Here are two common ones. Circuit 1: Digital Logic Isolation (High → Low) Scenario: Isolating a 24V PLC output to a 3.3V microcontroller input.
The forward voltage drop of 1.2V-1.6V is typical for GaAs IR LEDs. When calculating current-limiting resistors for microcontroller outputs (e.g., 5V logic), use R = (V_OH - V_F) / I_F, where I_F is typically 5-20 mA. Output (Phototransistor) Characteristics | Parameter | Symbol | Conditions | Min | Typ | Max | Unit | |-----------|--------|-------------|-----|-----|-----|------| | Collector-Electron Breakdown | BV_CEO | I_C = 100 μA, I_F = 0 | 80 | - | - | V | | Emitter-Collector Breakdown | BV_ECO | I_E = 100 μA | 6 | - | - | V | | Dark Current (Leakage) | I_CEO | V_CE = 20V, I_F = 0, Ta=25°C | - | 10 | 100 | nA | | Dark Current at 100°C | I_CEO | V_CE = 20V, I_F = 0, Ta=100°C | - | 1 | 10 | μA |
Inside the package, pin 1 connects to the LED’s anode, pin 2 to its cathode. The phototransistor sits with its collector on pin 4 and emitter on pin 3. There is no base pin exposed; base current is generated solely by illumination.
For digital logic interfaces (e.g., 5V to 3.3V), ranks A or B are sufficient. For analog applications or low I_F drive (e.g., 1 mA from a battery-powered MCU), ranks C or D provide higher sensitivity. Part 5: Switching Characteristics (Speed) The A1458 is not an ultra-high-speed device (like a logic gate optocoupler, e.g., 6N137), but it is adequate for most power supply feedback and low-speed data isolation (< 50 kHz).
| Rank | CTR Min (%) | CTR Max (%) | Conditions | |------|-------------|-------------|-------------| | A | 50 | 150 | I_F = 5 mA, V_CE = 5V, Ta=25°C | | B | 80 | 240 | I_F = 5 mA, V_CE = 5V, Ta=25°C | | C | 130 | 400 | I_F = 5 mA, V_CE = 5V, Ta=25°C | | D | 200 | 600 | I_F = 5 mA, V_CE = 5V, Ta=25°C |
Introduction In the world of electronics, isolation is paramount. Whether you are designing a switch-mode power supply (SMPS), a microcontroller interface for industrial machinery, or a safety system for a medical device, the optocoupler (also known as an opto-isolator) is a critical component. Among the myriad of options available, the A1458 optocoupler has gained recognition for its balance of speed, current transfer ratio (CTR), and isolation voltage.
| Model | CTR (%) | V_CEO (V) | t_on/t_off (μs) | Isolation (Vrms) | Best For | |-------|---------|-----------|-----------------|------------------|-----------| | | 50-600 | 80 | 5/4 | 5,000 | General purpose, wide CTR | | PC817 | 50-600 | 35 | 4/3 | 5,000 | SMPS feedback (lower V_CEO) | | 4N35 | 100 (min) | 30 | 10/10 | 5,000 | Hobbyist, older designs | | 6N137 | - (logic) | 7 | 0.075 | 5,000 | High-speed data (10 Mbps) |
| Parameter | Symbol | Conditions | Value | Unit | |-----------|--------|-------------|-------|------| | Isolation Voltage | V_ISO | Ta=25°C, 60Hz, 1 sec | 5,000 | Vrms | | Isolation Resistance | R_IO | V_IO = 500V | 10^12 (min) | Ω | | Isolation Capacitance | C_IO | V_IO = 0V, f=1MHz | 0.8 (typ) | pF |