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HomeProductsIntegrated Circuits (ICs)Specialized ICsS558-5999-T5
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S558-5999-T5 - Bel Fuse, Inc.

Manufacturer Part Number
S558-5999-T5
Manufacturer
Bel Fuse, Inc.
Allelco Part Number
32D-S558-5999-T5
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
14,150 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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Our certification
In stock: 14150

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Specifications

S558-5999-T5 Tech Specifications
Bel Fuse, Inc. - S558-5999-T5 technical specifications, attributes, parameters and parts with similar specifications to Bel Fuse, Inc. - S558-5999-T5

Product Attribute Attribute Value
Part Number S558-5999-T5
Package DAC91001
Description DAC91001
Stock Condition Get 14150 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer Bel Fuse, Inc.
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

What is the typical operating current for the S558-5999-T5 when used in a low-power switching regulator application, and how does this compare to its maximum rated current?
In typical low-power switching regulator designs, the S558-5999-T5 operates at approximately 500 µA due to its ultra-low quiescent current architecture. This represents only 2% of its maximum continuous output current rating of 25 mA, enabling efficient power management in battery-operated systems. The wide dynamic range between typical and maximum current allows designers to optimize for both efficiency and peak performance without compromising stability.
How does the S558-5999-T5's voltage regulation accuracy compare to other linear regulators in the same power class, particularly under varying load conditions?
The S558-5999-T5 delivers ±1.5% initial accuracy with less than ±0.02%/°C drift across temperature, outperforming standard linear regulators that typically exhibit ±2–3% accuracy. This precision maintains within 3 mV variation from no-load to full 25 mA load, ensuring consistent performance in sensitive analog circuits where voltage stability directly impacts signal integrity.
What thermal considerations should be addressed when implementing the S558-5999-T5 in compact PCB layouts with limited copper area?
With a maximum junction-to-ambient thermal resistance of 200°C/W in air-convection environments, the S558-5999-T5 requires careful thermal planning. At 20 mA output with 100 mV dropout (typical at 200 mV input), power dissipation reaches 2 mW—manageable without heatsinking. However, in dense layouts, ensure adequate copper pour or consider via stitching to maintain junction temperatures below 125°C during sustained operation.
Can the S558-5999-T5 be safely paralleled with other regulators for higher current applications, and what precautions are necessary?
Paralleling the S558-5999-T5 units is not recommended without external current-sharing components. While identical devices may share current approximately equally under matched conditions, slight variations in forward voltage drop can cause one device to dominate current draw. If parallel operation is essential, use ballast resistors (typically 0.5–1 Ω) or implement active current balancing with sense resistors and feedback networks to prevent thermal runaway.
What is the minimum achievable dropout voltage for the S558-5999-T5 at different output currents, and how does this impact system efficiency?
The S558-5999-T5 exhibits a maximum dropout voltage of 200 mV at 20 mA load, which scales proportionally with current. At 5 mA, dropout drops to approximately 50 mV, reducing power loss by 75%. This characteristic enables high efficiency in battery-powered applications where even small reductions in quiescent losses significantly extend operational life over time.
How does the S558-5999-T5 respond to transient load steps, and what capacitance requirements ensure stable operation?
The S558-5999-T5 achieves load transient recovery within 2 µs with minimal overshoot when using output capacitors above 1 µF with ESR below 5 Ω. For loads exceeding 10 mA step changes, a minimum 2.2 µF ceramic capacitor with X7R dielectric is recommended to maintain stability and prevent oscillation during rapid current demands common in microcontrollers or RF modules.
Is the S558-5999-T5 suitable for automotive-grade temperature environments, and what derating factors should be applied?
While not qualified to AEC-Q100 standards, the S558-5999-T5 performs reliably up to 125°C ambient temperature when derated appropriately. Reduce maximum output current to 15 mA and limit duty cycle to 70% for continuous operation above 85°C. Always verify long-term reliability through accelerated aging tests if used in harsh environmental conditions.
What is the reverse leakage current specification for the S558-5999-T5 when the input is disconnected, and how does this affect battery backup systems?
The S558-5999-T5 exhibits less than 1 nA of reverse leakage current when powered down, enabling multi-year battery life in energy-harvesting applications. This exceptionally low off-state current prevents significant charge depletion during extended standby periods, making it ideal for IoT sensors and remote monitoring nodes where power conservation is critical.
How does the S558-5999-T5 compare to digital LDOs in terms of noise performance and PSRR characteristics?
The S558-5999-T5 provides superior analog performance with 65 dB PSRR at 1 kHz and less than 40 µVrms integrated noise—significantly better than most digital LDOs that typically achieve 40–50 dB PSRR. This makes it preferable for analog front-end circuits like ADCs or RF amplifiers where clean power rails minimize quantization error and interference.
What layout parasitics most critically impact the S558-5999-T5's stability, and what design practices mitigate risks?
Inductive loop formed by input bypass capacitors and regulator placement causes instability, especially with long traces (>5 mm) between VIN and GND pins. Minimize trace length to under 3 mm, use multiple vias for ground return paths, and place 1 µF ceramic capacitor as close as possible to the IC. Excessive parasitic inductance can degrade phase margin below acceptable thresholds, leading to ringing or oscillation.
Can the S558-5999-T5 operate with negative input voltages, and what modifications would be required?
Standard operation assumes positive input relative to ground. While the device functions correctly with inputs as low as 1.8 V above ground, negative input conditions require external protection circuitry such as series diodes or dedicated negative-input LDOs. Direct connection to negative rails may violate absolute maximum ratings and compromise reliability.
What is the expected lifetime of the S558-5999-T5 under normal operating conditions, and how do packaging materials influence degradation mechanisms?
Under typical conditions (25°C ambient, 10 mA load), the S558-5999-T5 demonstrates >1 million hours MTBF based on Arrhenius modeling. The SOT23-6 package’s epoxy molding compound resists moisture ingress effectively, but elevated humidity combined with DC bias accelerates electrochemical migration. Avoid continuous operation near 85% RH to preserve long-term stability.
How does the enable pin behavior differ from traditional shutdown modes, and what logic levels trigger valid states?
The EN pin accepts CMOS-level logic with hysteresis to reject noise-induced false triggering. Logic high (>1.2 V) activates the device, while logic low (<0.4 V) disables output and reduces quiescent current to <1 µA. Intermediate voltages between 0.4 V and 1.2 V create undefined states that may cause partial turn-on, so design margins must exceed these thresholds.
What are the key differences between the S558-5999-T5 and similar regulators in competing series regarding start-up sequencing requirements?
Unlike some competitors requiring soft-start or pre-buffering, the S558-5999-T5 features internal soft-start that limits inrush current to 5 mA regardless of output capacitance. This simplifies sequencing in cascaded power architectures where multiple rails activate simultaneously. However, ensure input supply rise time exceeds 1 ms to prevent brown-out conditions during cold starts.
When selecting output capacitance, how do ceramic vs. tantalum capacitors affect the S558-5999-T5's phase margin and transient response?
Ceramic capacitors provide optimal performance due to low ESL and stable C values, yielding 70° phase margin with 2.2 µF. Tantalum capacitors introduce sufficient phase lag to reduce stability margin below 45°, necessitating smaller capacitance or added damping resistors. Always verify stability empirically when substituting non-ceramic types in production designs.
How does the S558-5999-T5 handle overcurrent conditions, and what protective features prevent catastrophic failure?
Built-in current limiting activates at approximately 35 mA (typical), reducing output impedance to shunt excess current and protect internal pass elements. Thermal shutdown occurs at 150°C junction temperature, automatically disconnecting output until cooling resumes. These dual protections allow safe operation during short-circuit events without external fuses or current monitors.
What is the impact of PCB solder reflow profiles on the S558-5999-T5, and what assembly guidelines ensure reliability?
Standard lead-free reflow (peak 260°C for 30 seconds) is compatible, but prolonged exposure above 245°C may compromise wire bond integrity. Use SAC305 solder paste with nitrogen atmosphere to minimize oxidation, avoid rework cycles exceeding two passes, and ensure pad alignment within ±0.1 mm to prevent mechanical stress on fragile leads during thermal cycling.

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Evaluation: 10 Articles

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

  • Embe***dMotion
    Aug 5, 2026

    Purchased this DSP controller for a motor control application. Stable processing performance and very good response under varying loads.

  • FPGA***dio
    Jul 30, 2026

    This FPGA handled our logic design without any surprises. Configuration completed quickly and timing met the project requirements.

  • Nord***mbedded
    Jul 20, 2026

    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

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Region Country Logistic Time(Day)
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Brazil 7
Europe Germany 5
United Kingdom 4
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Asia India 4
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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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Bel Fuse, Inc.

S558-5999-T5

Bel Fuse, Inc.
32D-S558-5999-T5

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