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SOT-89 / TO-92 · HT7533
ActiveLinear Voltage Regulators (LDO)
HT7533
Holtek · SOT-89 / TO-92 · Linear Voltage Regulators (LDO)
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Overview
The HT7533 is Holtek's low-power, low-dropout 3.3 V voltage regulator delivering up to 100 mA output current with only 4 µA quiescent current. Its ultra-low Iq and 100 mV dropout at 100 mA load make it the go-to LDO for battery-powered designs — coin-cell devices, wireless sensors, wearables, medical implants, remote controls, and IoT nodes that spend most of their life in deep sleep and wake only briefly.
Compared with the ubiquitous AMS1117-3.3 (5 mA quiescent), the HT7533 draws 1,000× less standby current. On a 2,000 mAh Li-ion battery, an always-on AMS1117 wastes 200 mAh/day just in quiescent current, killing the battery in 10 days; the HT7533 wastes 0.16 mAh/day and extends the same battery to years of standby.
Package options are SOT-89 (surface-mount) and TO-92 (through-hole), both with pinout Vin-GND-Vout. Input voltage range is 2.5 V to 30 V (absolute max 36 V), giving enormous margin for 2S/3S Li-ion packs, 9 V alkaline, 12 V wall adapters and even rectified AC with a bulk cap. Output accuracy is ±2% over line, load and temperature — adequate for MCU and sensor rails, not for precision analog reference.
Built-in protections include current limiting at 150 mA typical and thermal shutdown at 150 °C junction temperature. Stability requires only a 1 µF ceramic output capacitor — no bulky tantalum needed.
Related parts in the HT75xx family: HT7530 (3.0 V), HT7550 (5.0 V), HT7525 (2.5 V), HT7518 (1.8 V), HT7512 (1.2 V). All share the same pinout and package, so you can drop in different voltages without a PCB respin.
Common alternatives with similar specs: MCP1700 (Microchip, 1.6 µA Iq, 250 mA), XC6206 (Torex, 1 µA Iq, 200 mA), TLV702 (TI, 300 nA Iq shutdown, 300 mA).
Our Shenzhen stock: Holtek HT7533-1 (SOT-89 tape-and-reel) MOQ 1,000 pcs on reel or 100 pcs loose.
Key Features
- Only 4 µA quiescent current — 1000× lower than AMS1117
- 100 mV dropout at 100 mA load
- Wide 2.5-30 V input range
- SOT-89 and TO-92 packages with 1 µF ceramic output cap
Typical Applications
- Coin-cell and Li-ion battery-powered IoT sensors
- Wearable devices and fitness trackers
- Remote controls and key fobs
- Wireless sensor nodes with deep sleep duty cycles
- Medical implants and portable diagnostics
Specifications
- Output Voltage
- 3.3 V
- Output Current
- 100 mA
- Dropout Voltage
- 0.1 V
- Input Voltage (Max)
- 30 V
- Quiescent Current
- 4 µA
- Operating Temperature
- -40 to 85 °C
- Mounting Type
- Surface Mount / Through Hole
- Pins
- 3
- RoHS
- Compliant
Procurement Tips
For designs needing even lower quiescent current, spec MCP1700 (1.6 µA) or TLV702 (300 nA in shutdown) — they cost ~$0.10 more but extend coin-cell life from 3 years to 8+ years in low-duty-cycle applications.
Frequently Asked Questions
HT7533 vs AMS1117-3.3 — when should I use which?
HT7533 for battery-powered designs under 100 mA load: 4 µA quiescent saves months of battery life. AMS1117 for USB-powered or mains-powered designs needing 500 mA to 1 A: higher current capacity at 20× the quiescent draw. They are NOT pin-compatible — HT7533 is SOT-89 with Vin-GND-Vout left-to-right, AMS1117 is SOT-223 with GND-Vout-Vin.
Can I use HT7533 with a 5 V USB input?
Yes — input range goes to 30 V. Dropout is 100 mV at 100 mA, so 5 V in / 3.3 V out works with plenty of margin. Just ensure the load stays under 100 mA; for higher currents use AMS1117 or a buck converter.
Why does my HT7533 output drop under 100 mA load?
Check the output capacitor — the HT7533 requires at least 1 µF ceramic (X5R or X7R) close to the Vout pin for stability. Without it the regulator oscillates and average output sags. Also verify input voltage stays above 3.4 V (Vout + dropout) under load.
Can I parallel two HT7533 for 200 mA?
Not recommended — LDOs in parallel fight each other due to output voltage tolerance mismatch. For 200 mA use HT7550 (same family, 5 V output, 100 mA) or step up to MCP1703 (250 mA) or MIC5504 (300 mA).
Is HT7533 counterfeit-prone?
Moderately. Holtek is a smaller vendor than TI/onsemi, and fakes exist. Genuine parts have laser-etched "HT7533" plus date code, matte tin leads, and consistent weight. Fakes may be remarked AMS1117 with much higher quiescent current (5 mA vs 4 µA). Measure Iq with a µammeter — real HT7533 reads under 10 µA at no load.
MOQ and lead time?
MOQ 1,000 pcs on reel for HT7533-1 (SOT-89), or 100 pcs loose. Holtek authorized 4-8 weeks; Shenzhen stock 1-2 days.
Alternatives & Equivalents
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