STA505 - 40V 3.5A Quad Half-Bridge Amplifier | STMicroelectronics
MPN: STA505 ✓ Active| Qty | Unit Price | Extended |
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STA505 Overview
An audio power half-bridge is one section of a switching amplifier that uses complementary power transistors to drive a load in one current direction. A quad half-bridge can provide two stereo channels, four independent modulation outputs, or another bridge configuration selected by the CONFIG pin. The STA505 is therefore positioned between discrete power-stage design and a complete integrated audio amplifier.
Key verified characteristics include a 40 V power-stage rating, a 3.5 A half-bridge current capability, BCDMOS technology, and PowerSO-36 packaging. The device can be used as a dual bridge or reconfigured by connecting CONFIG to VDD for a single-bridge configuration with double current capability. Its binary half-bridge mode is also identified in the manufacturer datasheet.
The STA505 is suitable for high-power Class D audio systems, including stereo speaker drives, mono subwoofer amplifiers, compact hi-fi equipment, and external amplifier modules. Compared with a discrete MOSFET output stage, the monolithic quad half-bridge reduces board-level integration effort while retaining configurable drive modes and integrated protection functions.
Designers should verify the exact input, output, power, and protection limits in the STMicroelectronics datasheet before layout and power-supply selection. The PowerSO-36 package requires careful thermal planning, low-impedance supply routing, and output-filter design appropriate to the target speaker impedance and switching frequency.
This page consolidates the verified manufacturer and distributor information for the STA505, including configuration guidance, application context, and practical design considerations for evaluating the quad half-bridge stage.
Drop-in alternatives for STA505 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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| Device Type | Quad power half-bridge stage |
| Power Stage Voltage | 40 V |
| Half-Bridge Current | 3.5 A |
| Technology | Multipower BCDMOS |
| Configuration | Dual bridge, single bridge, or half bridge in binary mode |
| Audio Topology | Class D |
| Channel Configuration | 1-channel mono or 2-channel stereo |
| Package | PowerSO-36 |
| Pin Count | 36 pins |
| Logic Inputs | CMOS-compatible logic inputs |
| Output Stage | Complementary DMOS output stage |
| CONFIG Function | Configuration input; connecting CONFIG to VDD enables single-bridge configuration |
| Thermal Protection | Thermal protection and thermal warning |
| Output Fault Detection | Output overvoltage and undervoltage detection |
| PWRDN Input Current | 35 uA |
| Datasheet Availability | Manufacturer datasheet and distributor datasheet links available |
| RoHS Status | unknown |
STA505 powerso-36 Pin Configuration Guide
Pin configuration for STA505 (powerso-36 package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for STA505.
Refer to the datasheet for full pin configuration.
Typical Applications
STA505 is suitable for 6 applications: Stereo Class D Speaker Amplifier, Mono Subwoofer Power Stage, Portable High-Power Audio Module, USB and Digital Audio Amplifier, Industrial Audio and Public-Address Output, Multi-Channel Audio Amplifier Platform.
Stereo Class D Speaker Amplifier
The STA505 fits a stereo Class D speaker amplifier because its quad power half-bridge can be arranged as a dual bridge, and the verified distributor data identifies mono or stereo Class D operation. Place the four power-stage sections behind the appropriate input and PWM control circuitry, then use inductor-capacitor output filtering between the bridge outputs and speaker terminals. The 3.5 A half-bridge capability provides a useful starting point for load-current planning, but actual speaker power depends on supply voltage, load impedance, thermal conditions, and filter design.
Recommended
Mono Subwoofer Power Stage
The STA505 can support a mono subwoofer amplifier when the selected bridge configuration and output network match the intended speaker load. Its quad half-bridge structure provides flexibility for a compact high-current power stage, while the manufacturer-described CONFIG connection to VDD supports a single-bridge arrangement with double current capability. Validate the exact maximum output current, modulation method, supply limit, and thermal rise in the manufacturer datasheet before sizing inductors, capacitors, heat sinking, and copper.
Recommended
Portable High-Power Audio Module
The STA505 is useful in portable and compact audio modules where a discrete four-transistor bridge would consume excessive board area. Its integrated quad half-bridge stage consolidates four complementary DMOS output sections in PowerSO-36, while configurable bridge operation allows the board designer to match a mono or stereo architecture. The design must still account for battery or adapter voltage limits, output-filter losses, peak current, thermal rise, and the device’s verified absolute maximum ratings.
Recommended
USB and Digital Audio Amplifier
The STA505 can serve as the output power stage in a digital-audio system that accepts digital source signals and converts them through a suitable modulator and control stage. The verified product data specifically identifies STA505 as an audio amplifier IC, while the device’s quad half-bridge structure supports efficient Class D power delivery. A complete design should coordinate input filtering, clocking, modulation, dead time, output reconstruction filters, and fault handling rather than treating the power stage as a standalone codec.
Recommended
Industrial Audio and Public-Address Output
The STA505 can be evaluated for industrial audio, public-address, and other compact loudspeaker systems where high power-stage integration is valuable. The 40 V power-stage rating and 3.5 A half-bridge current figure provide concrete boundaries for supply and load planning. Industrial use still requires careful EMI control, output filtering, protection against speaker wiring faults, thermal monitoring, and verification of the exact operating-temperature limits, which were not included in the supplied verified data.
Recommended
Multi-Channel Audio Amplifier Platform
The quad half-bridge architecture makes the STA505 a candidate for multi-channel audio platforms that need several synchronized power outputs on one board. The dual-bridge configuration supports stereo, while binary half-bridge operation can serve designs that need a different modulation or drive arrangement. System partitioning should account for channel-to-channel timing, shared supply transients, thermal coupling, fault isolation, and the need to preserve adequate copper and decoupling around the PowerSO-36 power stage.
Recommended
Recommended Products Summary
Engineering reference data for STA505 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | STMicroelectronics |
| Package | PowerSO-36 |
| Function | Quad power half-bridge stage |
| Power-Stage Voltage | 40 V |
| Half-Bridge Current | 3.5 A |
| Technology | Multipower BCDMOS |
| Configuration | Dual bridge or reconfigured single bridge or binary half bridge |
| Audio Class | Class D audio amplification |
| Output Stage | Complementary DMOS |
| Protection Features | Thermal protection, thermal warning, output overvoltage and undervoltage detection |
Key Differentiators
- Integrated quad power-stage architecture (vs Discrete MOSFET half-bridge design)
- Flexible bridge configuration (vs Fixed dual-bridge amplifier design)
- Integrated protection and monitoring (vs Basic unprotected discrete output stage)
Design Notes
Treat the 40 V power-stage rating and 3.5 A half-bridge current as design constraints, not as guaranteed continuous speaker-output ratings. Size the supply, protection devices, output inductors, capacitors, and PCB copper using the worst-case load, startup transient, and thermal condition. The final limits must be taken from the STMicroelectronics datasheet rather than inferred from distributor descriptions.
PowerSO-36 requires deliberate thermal design because the integrated power stage dissipates energy during amplification. Use the exposed thermal area with uninterrupted ground and copper, select a heat-spreader strategy based on the calculated dissipation, and verify junction temperature under the maximum expected channel load. Estimated thermal calculations must use the actual supply, load, output power, ambient temperature, and package thermal data.
Keep the CONFIG connection, PWRDN, logic inputs, power rails, and output returns short and routed according to the manufacturer reference layout. Place input, supply, and output-filter components close to the relevant pins to minimize switching-loop area and high-current return discontinuities. A compromised ground plane or long supply path can increase EMI, distortion, and thermal problems even when the nominal electrical ratings appear satisfied.
The quad half-bridge outputs require an appropriate Class D reconstruction or output-filter network before connecting to speakers. Select component ratings and topology using the verified switching frequency, target speaker impedance, allowed ripple, and output-power requirements. Keep sensitive audio input and modulation circuitry away from high-current switching nodes, and use the thermal-warning and fault-detection functions in the system control strategy.
Compliance Information
The supplied search data identifies the part as RoHS compliant through the component listing context, but it does not provide complete current compliance records for REACH, AEC-Q100, lead-free status, halogen-free status, or conflict minerals.