C1237HA ( uPC1237HA ) is a monolithic protection IC developed by NEC for stereo audio power amplifiers and loudspeaker protection circuits. The IC helps prevent speaker damage caused by amplifier DC faults and suppresses turn-on/turn-off pop noise by controlling the speaker protection relay.
The package is 8 pin slim SIP Type.
The function of this semiconductor is Monolithic Protector IC.
The manufacturers of this product is NEC.
See the preview image and the PDF file for more information.
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Description
The C1237HA is a monolithic integrated circuit designed for protecting stereo power amplifiers and loudspeakers. In a stereo power amplifier, a protection IC (Integrated Circuit) is often used to safeguard the amplifier and connected speakers from potential damage due to various issues such as short circuits, overheating, over-voltage, and other electrical faults.
1. Overcurrent Protection: This feature detects excessive current flowing through the amplifier circuit and triggers a shutdown or limiting mechanism to prevent damage to the amplifier or connected speakers.
2. Overheat Protection: Overheating can damage amplifier components. A protection IC can monitor the temperature and shut down the amplifier or reduce power output if it reaches a critical level.
3. Short Circuit Protection: This feature detects short circuits in the output terminals and disconnects the amplifier from the power source to prevent damage to the amplifier and speakers.
Features
1. Work stably within a wide power supply voltage range. ( Vcc = 25 to 60 V )
2. Both positive and negative output offset can be detected through the same pin.
3. Need only single power supply.
4. Power-on delay function
5. Supports automatic reset or latch mode
6. Reduces turn-on and turn-off pop noise
Absolute Maximum Ratings (Ta = 25°C)
Integrated Functions
- Power-on delay timer
- DC offset detection for left channel
- DC offset detection for right channel
- AC power-off detection
- Relay driver transistor
- Fault timing control
- Latch/Auto-reset control
Protection Functions
| Function | Description |
| Power-On Delay | Delays speaker relay activation until amplifier output stabilizes. |
| DC Detection | Disconnects speakers when excessive DC voltage is detected. |
| AC Failure Detection | Quickly releases the relay when AC mains power is removed to eliminate turn-off pop noise. |
| Relay Driver | Directly drives an external speaker protection relay up to 80mA. |
| Operating Mode | Selectable automatic reset or latching protection via Pin 3. |
Typical Applications
- Stereo audio power amplifiers
- Hi-Fi amplifiers
- Integrated amplifiers
- Home theater receivers
- Active speaker systems
- Professional audio amplifiers
- Audio power modules
- DIY amplifier protection boards
C1237HA PDF Datasheet
