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HT7544-1
UMW
SOT-89 MONITORS & RESET CIRCUITS
385112 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 100mA SOT-89-3
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5.0 / 5.0
- (154 Ratings)
HT7544-1
Product Overview
11037524
DiGi Electronics Part Number
HT7544-1-DGManufacturer
UMW
HT7544-1
Description
SOT-89 MONITORS & RESET CIRCUITSInventory
385112 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 100mA SOT-89-3
Quantity
Minimum 1
Minimum 1
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HT7544-1 Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
Tape & Reel (TR)
Series
75xx
Product Status
Active
Output Configuration
Positive
Output Type
Fixed
Number of Regulators
1
Voltage - Input (Max)
30V
Voltage - Output (Min/Fixed)
4.4V
Voltage - Output (Max)
-
Voltage Dropout (Max)
0.1V @ 1mA
Current - Output
100mA
Current - Quiescent (Iq)
3 µA
PSRR
-
Control Features
-
Protection Features
Short Circuit
Operating Temperature
-25°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
TO-243AA
Supplier Device Package
SOT-89-3
Datasheet & Documents
HTML Datasheet
HT7544-1-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
4518-HT7544-1CT
4518-HT7544-1TR
4518-HT7544-1DKR
Standard Package
1,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
грудня 02, 2025
배송이 항상 정시에 이루어지고, 문제 해결도 신속해서 믿을 수 있어요.
грудня 02, 2025
対応が非常に迅速で、安心して取引できました。
грудня 02, 2025
I highly recommend DiGi Electronics for their reliable, on-time shipping and durable electronic components.
грудня 02, 2025
Their logistics are reliable and fast, saving me time and effort.
грудня 02, 2025
Their proactive stock management helps us avoid potential delays.
грудня 02, 2025
DiGi Electronics’ quick shipping process consistently impresses me.
грудня 02, 2025
Their customer support team is prompt and helpful, resolving any post-sale issues quickly.
грудня 02, 2025
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Frequently Asked Questions (FAQ)
When designing in the HT7544-1, how can I ensure stable operation under low-load conditions given its low quiescent current and lack of specified PSRR in the datasheet?
The HT7544-1 is a CMOS-based LDO with ultra-low 3 µA quiescent current, making it suitable for battery-powered applications. However, its stability under very light loads (below 1mA) depends on the output capacitor’s equivalent series resistance (ESR). While the datasheet doesn’t specify PSRR, using a ceramic capacitor of at least 1µF with low ESR (<1 Ω) at the output is recommended to maintain stability. Avoid excessively large capacitors (>10µF) without validating transient response, as this may introduce ringing due to phase margin limitations despite the device's internal compensation. Always verify stability across temperature and input voltage ranges in your final PCB layout to mitigate risk of oscillation in always-on monitoring circuits.
Can the HT7544-1 reliably replace the MCP1700T-4.4/TO in a 4.4V rail application where dropout performance at low current is critical?
Yes, the HT7544-1 can serve as a cost-effective drop-in replacement for the MCP1700T-4.4/TO in 4.4V fixed-output applications, especially in designs prioritizing low Iq and dropout voltage. The HT7544-1 specifies a maximum dropout of just 0.1V at 1mA, outperforming the MCP1700's typical 140mV at 100mA. This makes the HT7544-1 more efficient in sub-10mA average current systems where the regulator operates near zero load most of the time. However, verify that your design does not require tight line regulation under dynamic loads, as the HT7544-1 lacks detailed dynamic performance specs. Also confirm PCB footprint compatibility—both use SOT-89-3, but thermal pad layout may differ slightly, affecting long-term reliability under sustained load.
What are the risks of using the HT7544-1 near its 30V maximum input voltage in an industrial environment with unregulated power supplies?
Operating the HT7544-1 close to its 30V absolute maximum input voltage poses reliability risks in industrial settings where voltage transients or surges are common. Although the device includes short-circuit protection, it lacks overvoltage protection (OVP) and thermal shutdown with auto-recovery. Sustained operation above 26V, especially at elevated ambient temperatures (>50°C), increases thermal stress due to power dissipation (P = (Vin - Vout) × Iload). For example, at Vin = 28V and Iload = 50mA, power dissipation reaches ~1.18W in SOT-89-3, approaching thermal limits without adequate copper heatsinking. We recommend derating input voltage to ≤24V and using a transient voltage suppressor (TVS) diode on the input line to mitigate surge risks and ensure long-term reliability in harsh environments.
How does the HT7544-1 compare to the AMS1117-4.4 in terms of startup behavior and suitability for powering microcontrollers with brown-out detection?
The HT7544-1 offers faster and more predictable startup compared to the AMS1117-4.4, which lacks defined enable timing and has higher dropout (~1V at 100mA). The HT7544-1’s low 3 µA quiescent current and rapid turn-on (typically <50µs) make it ideal for microcontrollers requiring clean, fast resets upon battery insertion. Additionally, its tighter initial output tolerance (±2% vs. ±3% on AMS1117) improves accuracy for MCU VDD monitoring, reducing false brown-out triggers. However, unlike some AMS1117 variants, the HT7544-1 does not have a dedicated reset delay pin. Therefore, if your MCU requires a specific reset pulse width, add an external RC circuit or use a dedicated supervisor IC like the CAT811 alongside the HT7544-1 to ensure proper initialization timing.
What PCB layout practices should I follow when integrating the HT7544-1 to maximize thermal performance and minimize noise in mixed-signal sensor applications?
To optimize thermal performance of the HT7544-1 in SOT-89-3 package, allocate a minimum 15mm² of exposed copper connected to the GND pin (tab) via multiple vias (≥2x 0.3mm diameter) to inner ground planes. This reduces thermal resistance (θJA) from ~200°C/W to ~100°C/W, allowing safe operation up to 80mA at 70°C ambient. For mixed-signal designs, place the HT7544-1 close to the sensor load to minimize trace inductance and noise coupling. Use a single-point connection to analog ground and include a ferrite bead plus 100nF ceramic capacitor on the input if the power source is shared with digital circuits. Avoid routing digital signals under or near the HT7544-1 to prevent switching noise from modulating the low-noise output, ensuring accurate sensor readings.
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HT7544-1 CAD Models
UMW HT7544-1 PCB symbols & footprints
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