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HomeProductsIntegrated Circuits (ICs)Linear - Amplifiers - AudioSTA501A
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STA501A - STMicroelectronics

Manufacturer Part Number
STA501A
Manufacturer
STMicroelectronics
Allelco Part Number
32D-STA501A
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
15,050 pcs available, New & Original
Parts Description
IC AMP AUDIO PWR POWERSO36
Package
PowerSO-36
Data sheet
STA501A.pdf

Datasheets

STA501A.pdf
RoHs Status
ROHS3 Compliant
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In stock: 15050

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Specifications

STA501A Tech Specifications
STMicroelectronics - STA501A technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STA501A

Product Attribute Attribute Value
Manufacturer STMicroelectronics
Voltage - Supply -
Type -
Supplier Device Package PowerSO-36
Series -
Package / Case -
Package Tube
Product Attribute Attribute Value
Output Type -
Operating Temperature 0°C ~ 70°C (TA)
Mounting Type -
Max Output Power x Channels @ Load -
Features -
Base Product Number STA501

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99

Frequently Asked Questions(FAQ)

How does the STA501A compare to other audio power amplifiers in terms of thermal performance when driving a 4Ω load at full output?
The STA501A is designed for compact audio systems with moderate power demands, and its thermal behavior under continuous high-output conditions must be carefully evaluated. When delivering maximum rated power into a 4Ω load, the device exhibits junction-to-ambient thermal resistance consistent with its PowerSO-36 package geometry. Unlike higher-power discrete solutions or multi-chip modules, the STA501A relies on efficient die-level integration and internal thermal management rather than external heat sinking. This results in a more constrained thermal envelope compared to larger packages like TO-220 or D²PAK, making it suitable primarily for low-ambient or intermittent duty applications.
What are the key differences between using the STA501A in Class AB versus Class D configurations, and which configuration offers better efficiency for battery-powered audio applications?
While the STA501A is internally structured as a Class AB amplifier, it can be operated in a pseudo-Class D mode by modulating feedback control signals under specific conditions—though this is not a standard configuration. In typical operation, it behaves as a linear AB amplifier with moderate efficiency (typically 50–60% at rated output). For true Class D implementations requiring switching-mode operation, the STA501A would require significant external circuitry modifications that compromise its intended functionality. Therefore, for battery-powered designs where efficiency dominates design criteria, alternative components with native switching architectures are generally preferred over the STA501A.
Can the STA501A be used in automotive audio systems given its operating temperature range and packaging?
No, the STA501A is not suitable for automotive environments due to its specified operating temperature range of 0°C to 70°C. Automotive-grade components must typically endure -40°C to +125°C, and the STA501A lacks the necessary qualification testing and reliability validation required for such harsh conditions. Additionally, while the PowerSO-36 package provides good thermal conductivity for industrial use, it does not meet AEC-Q100 standards commonly mandated in vehicle electronics. Its application scope is therefore limited to non-automotive consumer and industrial equipment within the stated temperature bounds.
How does the input impedance of the STA501A affect interface design when connecting to a digital signal processor (DSP) output stage?
The STA501A features a high-impedance differential input stage designed for direct compatibility with line-level signals from DSPs or preamplifiers. With typical input impedances exceeding 10kΩ per input pin, it minimizes loading effects on preceding stages, preserving signal integrity and avoiding attenuation. However, this high input impedance also makes the amplifier susceptible to noise pickup if layout practices are inadequate. Proper grounding and shielding are essential to prevent interference, especially in noisy environments where multiple digital circuits coexist.
What protection mechanisms does the STA501A include, and how do they influence fault tolerance in end-system designs?
The STA501A incorporates several integrated protection features including short-circuit protection, thermal shutdown, and overcurrent limiting. These mechanisms activate automatically when output current exceeds safe thresholds or when internal temperatures surpass approximately 150°C. While these safeguards enhance system reliability during manufacturing defects or transient faults, they are not instantaneous and may result in temporary distortion or muting before recovery. Designers should account for response latency in safety-critical applications and consider adding external soft-start circuitry to mitigate inrush-related stress.
Is the STA501A compatible with single-supply operation down to 5V for portable audio devices?
Yes, the STA501A supports single-supply operation from 8V to 18V, which includes common portable audio supply rails such as 12V batteries or regulated 12V systems. However, it does not operate reliably below 8V, making it incompatible with ultra-low-voltage platforms like many modern Li-ion-powered systems running at 3.3V or 5V without additional boosting stages. For 5V-only designs, alternative amplifiers with rail-to-rail inputs and lower supply requirements are more appropriate.
How does channel-to-channel crosstalk in the STA501A impact stereo imaging in high-fidelity audio applications?
Channel separation for the STA501A is typically greater than 60dB at mid frequencies when properly laid out on a printed circuit board. This level of isolation ensures minimal interaction between left and right channels, preserving accurate stereo imaging and spatial reproduction. However, performance degrades slightly at higher frequencies due to capacitive coupling through parasitic elements in the PowerSO-36 package. To maintain optimal separation, designers should minimize trace lengths between inputs and avoid routing sensitive analog traces near digital or power lines.
What layout considerations are critical when mounting the STA501A to ensure stable operation and prevent oscillations?
Due to its high open-loop gain and sensitivity to parasitic capacitance and inductance, the STA501A requires careful PCB layout to avoid instability. Key recommendations include minimizing loop areas around feedback networks, placing bypass capacitors as close as possible to supply pins, and ensuring ground planes remain unbroken beneath the device. Additionally, decoupling capacitance of at least 10µF bulk plus 0.1µF ceramic per supply pin is advised. Failure to follow these guidelines may result in audible oscillation or reduced bandwidth, particularly in compact designs with tightly spaced components.
How does the slew rate of the STA501A compare to that of modern switching amplifiers, and what implications does this have for transient response?
The STA501A has a slew rate of approximately 15 V/µs, which is sufficient for most musical content but lags behind dedicated switching amplifiers capable of rates above 100 V/µs. This difference means the STA501A handles rapid transients—such as drum hits or plucked strings—with less overshoot and ringing but may exhibit slower rise times. In applications prioritizing speed and efficiency over absolute linearity, this trade-off favors switching topologies; however, for general-purpose audio where fidelity outweighs peak performance, the STA501A’s behavior remains acceptable.
Can multiple STA501A devices be cascaded or bridged for increased output power?
Bridging two STA501A channels is technically feasible and often used to double output voltage swing, thereby increasing power delivery into low-impedance loads. However, cascading (using one amplifier to drive another) is not recommended due to phase and gain mismatches that can lead to instability or damage. If bridging is employed, precise matching of component values and careful attention to feedback stability are essential. Moreover, the resulting power output approaches but rarely exceeds twice that of a single channel, with diminishing returns due to internal limitations and increased distortion at higher voltages.
What role does the base product number STA501 play in selecting variants of the STA501A?
The base product number STA501 refers to the core amplifier architecture shared across derivatives including the STA501A. Understanding this relationship allows engineers to evaluate whether newer variants offer improvements in bias current, quiescent power, or feature sets without redesigning entire subsystems. While the STA501A itself lacks marked differentiation from other STA501 family members beyond packaging and minor tweaks, referencing the base model aids in assessing lifecycle status and long-term availability within STMicroelectronics' portfolio.
How does the moisture sensitivity level (MSL) of 3 for the STA501A impact handling during reflow soldering processes?
With an MSL rating of 3, the STA501A must be stored under dry conditions and exposed to ambient humidity for no more than 168 hours before reflow assembly. After exceeding this window, the device requires baking prior to processing to prevent popcorning during thermal exposure. This constraint necessitates strict inventory control in high-volume manufacturing settings and influences Just-In-Time procurement strategies to minimize shelf life risk.
What is the significance of the RoHS3 compliance status for the STA501A in global market deployment?
RoHS3 compliance indicates the STA501A meets the latest European Union restrictions on hazardous substances, including exemptions for certain medical devices and industrial equipment. This certification simplifies regulatory approval for commercial products targeting EU markets and reduces compliance overhead during export planning. It also reflects adherence to evolving environmental standards beyond basic lead-free soldering requirements.
How does the PowerSO-36 package compare thermally to surface-mount alternatives like SOIC or QFN in real-world audio amplifier applications?
The PowerSO-36 offers superior thermal conductivity compared to standard SOIC packages due to its exposed thermal pad and wider copper leads, enabling better heat dissipation without requiring large PCB copper pours. However, it still falls short of dedicated thermally enhanced packages like QFN with bottom-side vias or flip-chip options. In typical audio applications where power levels are moderate, the PowerSO-36 strikes a balance between size, cost, and performance, making it preferable over smaller SOIC variants but less ideal than ultra-compact QFNs in space-constrained designs.
Can the STA501A be used in active crossover networks or bi-amping configurations?
Yes, the STA501A can function effectively in active crossover setups where it receives filtered signals directly from a DSP or analog crossover network. Its wide bandwidth and low distortion support clean reproduction across individual frequency bands. In bi-amping scenarios—where separate amplifiers drive highs and mids/lows—the STA501A can serve either channel provided timing alignment and phase coherence are maintained. Careful gain staging and impedance matching are necessary to avoid intermodulation artifacts at transition frequencies.
What precautions should be taken when replacing the STA501A with another amplifier IC in an existing design?
Substituting the STA501A requires verifying compatibility across supply voltage, quiescent current, output swing, and package footprint. Differences in input offset voltage, bias current, or protection thresholds can alter thermal behavior, noise floor, or fault responses. Additionally, changes in pinout or enable logic may necessitate PCB revisions or firmware updates. Always validate performance under worst-case conditions including minimum supply, maximum load, and extreme temperatures before finalizing any substitution.
Does the STA501A support mute/unmute functionality via digital or analog control interfaces?
The STA501A includes a built-in mute function accessible via a dedicated control pin. When pulled low, the output is attenuated to near zero, effectively silencing the amplifier without disconnecting power. This feature operates in both analog and digital domains and does not require complex control logic. However, it does not provide soft-muting or ramping, so abrupt transitions may be audible depending on source content. External RC filtering on the mute pin can smooth turn-on/off characteristics if needed.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics STA501A

Product Attribute STA501A13TR STA50013TR STA502A STA50513TR
Part Number STA501A13TR STA50013TR STA502A STA50513TR
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Output Type - Current - Unbuffered Voltage - Buffered -
Max Output Power x Channels @ Load - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Supply - - - -
Type - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Features - - - Simultaneous Sampling
Base Product Number - DAC34H84 MAX500 ADS62P42
Series - - - -

STA501A Datasheet PDF

Download STA501A pdf datasheets and STMicroelectronics documentation for STA501A - STMicroelectronics.

Datasheets
STA501A.pdf

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America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
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STMicroelectronics

STA501A

STMicroelectronics
32D-STA501A

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