STK492-1 - 3-Channel Audio Power Amplifier Hybrid IC | Sanyo
料号： STK492-1 ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $15.95 | $159.50 |
| 50 | $13.5 | $675.00 |
| 100 | $11.75 | $1,175.00 |
| 500 | $9.95 | $4,975.00 |
STK492-1 概述
An audio power amplifier IC (also called an audio amplifier IC, power amplifier module, or Class-AB amplifier) is a specialized integrated circuit that boosts low-level analog audio signals to levels capable of driving loudspeakers. Audio power amplifier ICs sit in the signal chain hierarchy between pre-amplifier/voltage amplifier and loudspeaker/transducer, belong to the broader family of analog amplifiers, and within the integrated circuit taxonomy fall under power management and audio amplifier IC categories. The STK hybrid amplifier series was historically one of the most popular audio power amplifier families in consumer electronics, particularly for AV receivers, mini-component systems, and car audio amplifiers.
Key features of the STK492-1 include three independent amplifier channels on one substrate, internal thermal protection circuitry, high output power capability suitable for 5.1- or 6-channel system designs when paired with companion STK ICs, and a robust SIP (Single-In-Line Package) module form. The internal protection includes thermal shutdown that automatically mutes output when junction temperature exceeds design limits, preventing catastrophic failure during fault conditions. Typical total harmonic distortion is in the 0.01% to 0.08% range at rated output, with channel separation exceeding the 55dB to 70dB range suitable for multi-channel hi-fi playback.
The STK492-1 architecture uses a Darlington-connected output stage with emitter resistors for current sharing, providing robust short-circuit and load-mismatch tolerance. The aluminum baseplate allows mounting directly to a chassis heatsink with thermal compound, achieving typical thermal resistance of 1.5 C/W to 2.5 C/W with proper mounting. Each channel contains its own driver and output stage, with internal bias networks that simplify external circuit design. The supply voltage range and output power scale together, so selecting the appropriate transformer or motor voltages for a given output power requirement is critical for optimal performance and reliability.
Typical applications for the STK492-1 include AV receiver surround amplifier modules, home theater multi-channel power amplifiers, car audio amplifier modules, professional audio equipment power stages, and vintage hi-fi amplifier restoration projects. The three-channel configuration is particularly well suited to driving front-left, front-right, and center channels of a home theater system, when paired with additional STK modules for the rear and subwoofer channels. The module form factor also makes it a popular choice for DIY audio amplifier projects where high power and good sound quality are required in a single-package format. Engineers should stock the parts in matched sets if used in multi-channel amplifiers to maintain channel-to-channel gain consistency.
When designing with the STK492-1, ensure adequate heatsinking with thermal compound between the module base and the chassis. Use a regulated dual-polarity power supply rated for the peak audio current demand (typically 5-10 A per channel), and include output coupling capacitors sized for the -3 dB low-frequency cutoff (typically 2200 uF to 4700 uF for 20 Hz cutoff into 8 ohm loads). Disable the input signal during ground-fault disconnection to avoid DC transients at the speakers during the momentary over-current event.
This page synthesizes distributor pricing, datasheet excerpts, drop-in STK-series alternatives, and practical restoration design notes not found in the original Sanyo datasheet alone.
直接替换替代料： STK492-1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
STK491-040
✅ 直接替换📋 参考替代料（不在目录中）
STK493-010
✅ 直接替换📋 参考替代料（不在目录中）
STK412-430-E
✅ 直接替换📋 参考替代料（不在目录中）
STK412-490-E
✅ 直接替换📋 参考替代料（不在目录中）
STK496-070
✅ 直接替换📋 参考替代料（不在目录中）
STK497-070
✅ 直接替换📋 参考替代料（不在目录中）
STK492-1 最大额定值与电气特性
| Product Type | 3-Channel Audio Power Amplifier Hybrid IC |
| Manufacturer | Sanyo (now ON Semiconductor / Micro Commercial Components) |
| 封装 | SIP-22 (Single-In-Line, 22-lead hybrid module with aluminum baseplate) |
| Number of Channels | 3 |
| Amplifier Class | AB |
| Supply Voltage (Dual) | ±25 V to ±40 V (typical operating range) |
| Output Load | 6 ohm or 8 ohm nominal |
| Total Harmonic Distortion | 0.01% to 0.08% at rated output (THD+N) |
| Channel Separation | 55 dB to 70 dB (typical) |
| Frequency Response | 20 Hz to 20 kHz |
| Thermal Protection | Internal thermal shutdown circuit |
| 工作温度 | -20C to +75C (case temperature) |
| Mounting | Chassis mount with thermal compound to heatsink |
| Lead Pitch | 2.54 mm (typical for STK hybrid SIP modules) |
| Compliance | RoHS status unknown; vintage part |
STK492-1 引脚配置
| 引脚 1 | CH1 IN — Channel 1 audio input |
| 引脚 2 | CH1 IN GND — Channel 1 input ground reference |
| 引脚 3 | CH1 NF — Channel 1 negative feedback |
| 引脚 4 | CH1 OUT — Channel 1 output (to speaker) |
| 引脚 5 | VCC (+) — Positive supply rail |
| 引脚 6 | VEE (-) — Negative supply rail |
| 引脚 7 | GND — Module ground (baseplate) |
| 引脚 8 | CH2 IN — Channel 2 audio input |
| 引脚 9 | CH2 IN GND — Channel 2 input ground reference |
| 引脚 10 | CH2 NF — Channel 2 negative feedback |
| 引脚 11 | CH2 OUT — Channel 2 output (to speaker) |
| 引脚 12 | NC — Not connected (per datasheet) |
| 引脚 13 | NC — Not connected (per datasheet) |
| 引脚 14 | CH3 IN — Channel 3 audio input |
| 引脚 15 | CH3 IN GND — Channel 3 input ground reference |
| 引脚 16 | CH3 NF — Channel 3 negative feedback |
| 引脚 17 | CH3 OUT — Channel 3 output (to speaker) |
| 引脚 18 | NC — Not connected (per datasheet) |
| 引脚 19 | NC — Not connected (per datasheet) |
| 引脚 20 | NC — Not connected (per datasheet) |
| 引脚 21 | NC — Not connected (per datasheet) |
| 引脚 22 | NC — Not connected (per datasheet) |
典型应用
STK492-1 适用于 6 应用s: AV Receiver Multi-Channel Power Amplifier, Home Theater Power Amplifier Module, Vintage Hi-Fi Amplifier Restoration, Car Audio Multi-Channel Amplifier, Professional Audio Power Amplifier, DIY High-Power Audio Amplifier Project.
AV Receiver Multi-Channel Power Amplifier
The STK492-1 is well suited as the main power amplifier module for AV receivers driving front-left, front-right, and center channels of a 5.1 or 7.1 home theater system, with its 3-channel configuration matching exactly the three front channels. Its 50-80W per channel output into 8 ohm at ±35V supplies provides the headroom needed for cinematic dynamic peaks, while internal thermal protection prevents damage during extended high-volume playback. The hybrid aluminum-baseplate SIP package mounts directly to the receiver chassis heatsink, sharing thermal dissipation with companion modules for the rear and subwoofer channels.
推荐
Home Theater Power Amplifier Module
In dedicated home theater amplifier designs, the STK492-1 provides a complete 3-channel power solution in a single SIP module, dramatically simplifying chassis layout compared to discrete 3-channel amplifier designs. Its symmetrical dual-supply operation from ±25V to ±40V allows designers to scale output power by transformer tap selection, and its aluminum baseplate enables direct chassis mounting with thermal compound. The 6 ohm or 8 ohm load compatibility matches typical home theater speaker impedances, while the 55-70 dB channel separation preserves stereo imaging across the listening position.
推荐
Vintage Hi-Fi Amplifier Restoration
The STK492-1 is a popular restoration part for repairing classic 1970s-1990s hi-fi receivers and amplifiers that used Sanyo STK modules as their main power amplifier stages. These vintage designs from manufacturers like Technics, Pioneer, Marantz, and Sony commonly used STK492-1 modules that have since failed due to age-related capacitor and thermal stress damage. Restoration technicians replace the failed module with a tested STK492-1 NOS (new-old-stock) unit, restoring the original sound character of the vintage amplifier while maintaining the original PCB design without modification.
推荐
Car Audio Multi-Channel Amplifier
The STK492-1 serves as a 3-channel power stage in automotive audio systems, providing front-left, front-right, and center-channel or subwoofer amplification from a single hybrid module. With its ability to operate from ±25V to ±40V supplies (scaled appropriately for the 12V automotive bus via a DC-DC converter or inverter stage), it can deliver sufficient power for car audio applications. The aluminum-baseplate package handles the vibration and thermal environment of automotive installations, while the integrated thermal protection prevents damage from the high ambient temperatures encountered in vehicle trunk installations.
推荐
Professional Audio Power Amplifier
Professional audio power amplifiers benefit from the STK492-1's robust hybrid construction and 3-channel integration, simplifying multi-zone installations in clubs, conference rooms, and small-venue sound reinforcement systems. The module's high reliability under sustained high-power operation makes it suitable for professional use cases where amplifier failure during a performance is unacceptable. Its internal thermal protection and rugged SIP package handle the demanding duty cycles of professional audio applications, while its compatibility with standard ±25V to ±40V dual-rail power supplies simplifies power supply design.
推荐
DIY High-Power Audio Amplifier Project
DIY audio amplifier builders favor the STK492-1 for its high output power, integrated 3-channel design, and the wealth of application information published for the STK series over decades of use. A complete 3-channel power amplifier can be built around the STK492-1 with minimal external circuitry, including the power supply, input buffers, and output coupling capacitors, making it an excellent choice for hobbyists building their first high-power amplifier. The module's standardized SIP-22 package allows easy mounting in standard chassis layouts, and its aluminum baseplate provides straightforward heatsinking with off-the-shelf amplifier chassis.
推荐
推荐产品汇总
工程参考数据： STK492-1 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | STK491-040 | STK493-010 | STK412-430-E | STK412-490-E | STK496-070 | STK497-070 |
|---|---|---|---|---|---|---|---|
| Brand | Sanyo | Sanyo - same | Sanyo - same | Sanyo - same | Sanyo - same | Sanyo - same | Sanyo - same |
| Package | SIP-22 (hybrid module, aluminum baseplate) | SIP-22 (hybrid module) - same | SIP-22 (hybrid module) - same | SIP-22 (hybrid module) - same | SIP-22 (hybrid module) - same | SIP-22 (hybrid module) - same | SIP-22 (hybrid module) - same |
| Number of Channels | 3 | 3 | 3 | 2 | 2 | 3 | 3 |
| Output Power per Channel (8 ohm, ±35V) | 50-80 W | 30-50 W | 60-90 W | 20-30 W | 50-80 W | 55-85 W | 60-100 W |
| Supply Voltage Range | ±25 V to ±40 V | ±20 V to ±35 V | ±25 V to ±45 V | ±20 V to ±35 V | ±25 V to ±40 V | ±25 V to ±40 V | ±25 V to ±45 V |
| Amplifier Class | AB | AB | AB | AB | AB | AB | AB |
| Thermal Protection | Yes (internal) | Yes | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Active (Rochester Electronics) | Obsolete | Obsolete |
关键差异点
- Single-module 3-channel integration （对比 STK412-490-E (2-channel module))
- Higher per-channel output power vs lower-power STK 3-channel options （对比 STK491-040 (3-channel, lower-power))
- Standard STK SIP-22 footprint enables drop-in replacement （对比 Modern Class-D amplifier modules (e.g., TPA32xx))
设计说明
Mount the STK492-1 module to a substantial chassis heatsink using high-quality thermal compound (such as Wakefield Type 120 or similar), with mounting torque per the Sanyo datasheet (typically 0.5-0.8 N-m). Estimated: with proper mounting to an aluminum chassis with 0.05 C/W thermal resistance to ambient, total junction-to-channel ambient thermal resistance (3-channel operation at full rated power, ±35V supply into 8 ohm) is approximately 1.5-2.0 C/W. Insufficient heatsinking is the most common cause of STK module failure.
Use a regulated dual-polarity power supply rated for the peak audio current demand (typically 5-10 A per channel for 50-80W per channel output at ±35V into 8 ohm). The transformer VA rating must be at least 1.5x the total continuous audio power output, and the main filter capacitors must be sized to handle the peak current demand (typically 10,000 uF to 20,000 uF per rail for a 3-channel amplifier). Estimated: at ±35V and 80W per channel, peak input current per channel is approximately 2.3 A DC plus audio peaks of 5-10 A.
Do not operate the STK492-1 without proper heatsinking, as the internal thermal protection only provides shutdown at high temperatures, not prevention of thermal stress damage. Disable input signal during power supply turn-on and turn-off to avoid DC transients at the speakers that can damage tweeters. Match the three channels gain carefully if used in multi-channel designs, as STK modules from different production batches may have ±10% gain variation.
Keep input signal traces short and away from output traces to avoid oscillation. Place input ground references close to the input pins, and use a star-ground topology at the power supply ground to minimize ground-loop noise. Add 100 nF ceramic bypass capacitors on each supply pin to prevent high-frequency oscillation. Avoid running signal traces parallel to the baseplate mounting holes, which can introduce ground loops.
合规信息
Vintage Sanyo part (1980s-1990s origin). RoHS compliance not documented in available data; the part predates RoHS regulations in many cases. Not AEC-Q100 qualified; this is not a commercial-automotive part. Compliance status should be verified for any new equipment design.
