Since Sanyo discontinued the STK series, originals are scarce. Beware of cheap counterfeits from China (they often blow up immediately).
| Model | Power (approx) | Compatibility | | :--- | :--- | :--- | | STK411-210E | 50W | Original reference | | STK412-130 | 60W | Pin compatible (higher voltage) | | STK410-150 | 40W | Pin compatible (lower voltage) |
Recommendation: If you cannot find a genuine STK411-210E (check the backplate for proper laser etching), consider building a discrete amplifier or use a modern module like the TDA7294 or LM3886, which are electrically similar but require PCB adapters.
The STK411-210E typically utilizes an 18-pin Single Inline Package (SIP).
| Pin No. | Function | Description | | :---: | :--- | :--- | | 1 | Input (Ch 1) | Audio Signal Input for Channel 1 | | 2 | NFB (Ch 1) | Negative Feedback input for Channel 1 | | 3 | Pre-GND | Ground for the pre-driver stage | | 4 | Pre-Vcc (-) | Negative Supply for pre-driver stage | | 5 | NFB (Ch 2) | Negative Feedback input for Channel 2 | | 6 | Input (Ch 2) | Audio Signal Input for Channel 2 | | 7 | Mute/Standby | Control pin for muting function | | 8 | Power GND | Ground for power output stage | | 9 | Output (Ch 2) | Speaker Output for Channel 2 | | 10 | Power Vcc (-) | Negative Power Supply for Ch 2 | | 11 | Power Vcc (+) | Positive Power Supply for Ch 2 | | 12 | Boot (Ch 2) | Bootstrap connection for Ch 2 | | 13 | NC | No Connection | | 14 | Boot (Ch 1) | Bootstrap connection for Ch 1 | | 15 | Power Vcc (+) | Positive Power Supply for Ch 1 | | 16 | Power Vcc (-) | Negative Power Supply for Ch 1 | | 17 | Output (Ch 1) | Speaker Output for Channel 1 | | 18 | Pre-Vcc (+) | Positive Supply for pre-driver stage |
(Note: Pinouts may vary slightly by revision. Always verify the specific footprint on the physical package metal casing.) stk411210e datasheet
The datasheet outlines recommended supply rails, decoupling capacitor values, and surge-handling requirements. Best practices:
For bridged output configurations, designers should follow the module’s notes on allowable DC offsets, load impedance, and power calculations, since apparent output power doubles but dissipation constraints change.
| Model | Power (6Ω) | Supply | Package | Replacement | |-------|------------|--------|---------|-------------| | STK411-210E | 50W+50W | ±35V | SIP-16 | Direct | | STK411-110E | 35W+35W | ±28V | SIP-16 | Lower power | | STK412-210E | 60W+60W | ±38V | SIP-16 | Upgrade (check pinout) | | STK401-120 | 45W+45W | ±32V | SIP-16 | Similar but different gain |
Always compare the full datasheet before substituting.
This component operates at voltages that can be hazardous. Proper isolation and fusing are required. Ensure the heatsink is properly attached and thermally coupled using thermal compound to prevent overheating and thermal runaway. Since Sanyo discontinued the STK series, originals are
If you are restoring vintage audio (stereo receivers, powered mixers, 1980s–1990s amps), the STK411-210E is a usable hybrid module.
For new designs, avoid it – no supply chain, risk of fakes, inferior to modern Class-D or discrete Class-AB.
STK411-210E is a 2-channel audio power amplifier Thick Film Hybrid IC developed by Sanyo (now part of ON Semiconductor/Panasonic). It is primarily designed for high-fidelity audio systems and split power supply applications. Core Specifications
Based on typical datasheet parameters for the STK411 series: Package Type : ZIP-22 (Zig-Zag In-line Package with 22 pins). Amplifier Class
: Often used in Class H or high-efficiency designs for audio equipment. Power Output
: While specific wattage varies by supply voltage, the STK411 series typically covers ranges from 10W to 50W per channel depending on the specific model suffix. Supply Voltage : Operates on a split power supply This component operates at voltages that can be hazardous
(+Vcc and -Vcc) to minimize output distortion and improve dynamic range. Key Features for Implementation High Temperature Performance : These ICs are built to handle heat, but they require a substantial heatsink for prolonged operation. Safety & Longevity
: They have a long shelf life if stored in ideal conditions and are generally RoHS compliant. Application
: Commonly found in mini-component stereo systems, AV receivers, and active speaker sets. Resources & Downloads
To view the full electrical characteristics (such as Total Harmonic Distortion (THD), maximum supply voltage, and pinout diagrams), you can access the original documents here: Full PDF Datasheet : Available for download or viewing on AllDatasheet Schematics & Service Manuals
: Often included in repair guides for older audio brands on sites like or finding a compatible replacement for this IC? STK411-210E Datasheet, PDF - ALLDATASHEET.COM