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Analog Devices Inc./Maxim Integrated MAX8881EUT33
- Part No.:
- MAX8881EUT33
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX8881EUT33.pdf
- Description:
- IC REG LINEAR 3.3V 200MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,767
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Product details
Overview
MAX8881EUT33 from Maxim Integrated is a fixed-output, ultra-low-quiescent-current LDO linear regulator delivering 3.3V at up to 200mA with ±1.5% output voltage accuracy, 3.5µA supply current at 12V input, and integrated reverse-battery protection - designed for long-life battery-powered smoke detectors and smart battery packs.
For engineers reviewing the MAX8881EUT33 datasheet, MAX8881EUT33 pinout, MAX8881EUT33 application, or MAX8881EUT33 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOT23-6 pin functions, and two confirmed alternative regulators with documented functional and application differences.
Technical Context
The MAX8881EUT33 implements a P-channel MOSFET pass device (RDS(ON) = 2Ω) enabling ultra-low dropout voltage (100–200mV at 50mA) and stable 3.3V regulation across 2.5V–12V input range. Its internal 1.25V reference and error amplifier compare feedback from the internally connected FB–OUT node to maintain output accuracy.
It integrates reverse-battery protection limiting IN-to-GND reverse leakage to <1mA, thermal shutdown at +160°C (15°C hysteresis), short-circuit foldback limiting (250mA typical), and an open-drain POK output that asserts low when VOUT drops >10% below nominal - all without external components beyond required input/output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over -40°C to +85°C - ensures reliable logic-level supply for 3.3V microcontrollers and sensors. |
| Supply Current | 3.5µA typical at 12V input - extends shelf life and standby runtime in battery-powered alarms and remote transmitters. |
| Input Voltage Range | 2.5V to 12V - supports single-cell Li-ion (3.0–4.2V), dual-cell alkaline (2.4–3.2V), and 9V battery systems without external pre-regulation. |
| Max Output Current | 200mA continuous - sufficient to power RF transceivers, small displays, or multiple low-power ICs from one regulator. |
| Dropout Voltage | 100mV typical at 50mA load - enables operation down to ~3.4V input while maintaining 3.3V output, maximizing usable battery capacity. |
| POK Threshold | 90% of nominal VOUT (2.97V) with 1.5% hysteresis - provides clean, noise-immune power-good signaling for system reset or fault logging. |
| Package | SOT23-6 (top mark AAHU) - 2.9mm × 2.8mm footprint compatible with high-density portable PCB layouts. |
Pinout & Package
MAX8881EUT33 is housed in a 6-pin SOT23 package (JEDEC MO-178AA, top mark AAHU), with exposed pad omitted - suitable for standard reflow assembly and hand-soldering. Thermal performance relies on copper pour under pins 2 (GND) and 3 (OUT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Bypass with ≥1µF ceramic capacitor to GND; accepts 2.5V–12V; reverse-battery protected to <1mA leakage. |
| 2 (GND) | Ground reference | Primary return path for IN, OUT, SHDN, and POK; must connect to low-impedance system ground plane. |
| 3 (OUT) | Regulated 3.3V output | Requires ≥4.7µF output capacitor (<0.5Ω ESR) for stability at full 200mA load; supplies downstream circuitry. |
| 4 (FB) | Feedback sense node | Internally tied to OUT - no external resistors needed; validates regulation loop integrity for fixed 3.3V operation. |
| 5 (SHDN) | Enable/disable control | Active-high: >2V = ON, <0.5V = OFF; connect to IN if unused; series 100kΩ resistor adds reverse-battery protection. |
| 6 (POK) | Power-OK open-drain flag | Sinks current when VOUT < 2.97V or during shutdown; requires external pull-up to VOUT or higher rail for logic-level signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 3.5µA at 12V input enables >10-year battery life in low-duty-cycle smoke detectors with monthly self-test. |
| Reverse battery protection | Sub-1mA reverse leakage prevents damage and false triggering when alkaline batteries are inserted backward in consumer alarm units. |
| Integrated POK comparator | Eliminates need for external supervisor IC in battery-backed RTC or memory modules - reduces BOM count and board area. |
| Thermal foldback + shutdown | Prevents thermal runaway during sustained overload (e.g., shorted output trace); pulsing behavior allows safe fault detection without latch-off. |
| Stable with low-ESR ceramics | Validated with 4.7µF X7R/X5R MLCCs - avoids costly tantalum or polymer capacitors while ensuring robust transient response. |
Applications
| Smoke Detectors | Battery-Powered Alarms |
|---|---|
Use Scenario: Standby operation for >5 years on two AA alkaline cells, with periodic audible chirp and monthly self-test activation. IC Role / Device Role / Timing Role: Primary 3.3V power source for MCU, piezo driver, and CO sensor interface - maintains regulation during battery voltage decay from 3.2V to 2.5V. Use Value: 3.5µA quiescent current directly extends operational lifetime beyond UL 217 certification requirements for residential units. | Use Scenario: Wireless door/window contact sensor using CR2032 coin cell, transmitting status every 30 seconds via sub-GHz RF. IC Role / Device Role / Timing Role: Low-noise 3.3V supply for RF transceiver and wake-up timer - suppresses switching noise that could degrade receiver sensitivity. Use Value: 300µVRMS output noise (10Hz–100kHz) prevents bit errors in OOK/FSK demodulation under weak-signal conditions. |
| Remote Transmitters | Smart Battery Packs |
Use Scenario: Handheld industrial remote with momentary push-button operation, powered by two AAA cells. IC Role / Device Role / Timing Role: Stable 3.3V rail for ARM Cortex-M0+ MCU and BLE radio - sustains full transmit power even as battery sags to 2.7V. Use Value: 100mV dropout at 50mA enables >95% depth-of-discharge utilization before brownout, increasing usable battery energy. | Use Scenario: Rechargeable Li-ion pack with fuel gauge, protection IC, and LED status indicators - operating across -20°C to +60°C ambient. IC Role / Device Role / Timing Role: Backup regulator for EEPROM and real-time clock during main FET switch-off or charging interruption. Use Value: ±1.5% output accuracy over temperature ensures precise voltage reference for coulomb counting and state-of-charge algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS78033DRVR | 2.5µA IQ, 200mA, 3.3V fixed, SOT23-5 - lacks POK output and reverse-battery protection. | Requires external supervisor for power-good monitoring; unsuitable where reverse insertion risk exists (e.g., consumer replaceable battery compartments). | Select when lowest possible IQ is critical and POK/reverse protection are handled elsewhere in system design. |
| MCP1801T-3302E/OT | 3.5µA IQ, 150mA, 3.3V fixed, SOT23-5 - no POK, no reverse-battery protection, lower current rating. | Not rated for 200mA continuous loads; cannot support RF transceivers drawing peak >150mA without dropout. | Choose only for cost-sensitive, low-current applications where POK and reverse protection are non-essential. |
Compared with TPS78033DRVR and MCP1801T-3302E/OT, the MAX8881EUT33 uniquely combines ultra-low IQ, integrated POK, reverse-battery hardening, and 200mA capability in a 6-pin SOT23 - making it the only option among the three qualified for safety-critical, field-replaceable battery systems requiring autonomous fault signaling and polarity immunity.
Availability
MAX8881EUT33 is available at Aetrix Electronics and suitable for smoke detectors, battery-powered alarms, and remote transmitters requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for MAX8881EUT33 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and battery-constrained applications.
The MAX8880/MAX8881 product line was engineered specifically for ultra-long-life, reverse-polarity-resilient power regulation in safety-critical portable electronics - prioritizing sub-5µA quiescent current, integrated fault signaling, and robust protection architecture over raw speed or high current density.
FAQ
What is the maximum input voltage the MAX8881EUT33 can tolerate?
The MAX8881EUT33 supports an absolute maximum input voltage of +14V relative to GND, but its specified operating range is 2.5V to 12V. Operation above 12V risks exceeding thermal limits under load and is not guaranteed for parametric performance or reliability. For 12V nominal systems, ensure transient suppression (e.g., TVS diode) is used to clamp spikes within the 14V absolute max rating.
Does the MAX8881EUT33 require external feedback resistors to set its 3.3V output?
No, the MAX8881EUT33 does not require external feedback resistors. Its 3.3V output is factory-preset using internal precision resistors; the FB pin is internally connected to the OUT pin. External resistors are only needed for the adjustable MAX8880 variant. Connecting external components to FB on the MAX8881EUT33 may disrupt regulation or damage the internal divider.
Can the MAX8881EUT33 be used with ceramic output capacitors?
Yes, the MAX8881EUT33 is explicitly characterized for stability with ceramic output capacitors - specifically 4.7µF X7R or X5R dielectrics with ESR <0.5Ω for 200mA loads. It does not require the higher ESR of tantalum or aluminum electrolytic capacitors, enabling smaller, more reliable, and lower-cost filtering solutions in space-constrained designs.
How does the POK output of the MAX8881EUT33 behave during shutdown?
The POK output of the MAX8881EUT33 is actively pulled low during shutdown (when SHDN < 0.5V) as well as when VOUT falls below 90% of nominal (2.97V). During normal regulation, POK is in high-impedance state. To interface with logic inputs, connect a pull-up resistor (e.g., 100kΩ) from POK to VOUT or another valid supply rail - no additional driver circuitry is needed.
Is the MAX8881EUT33 pin-compatible with other devices in the MAX8880/MAX8881 family?
Yes, all MAX8880/MAX8881 variants in the SOT23-6 package - including MAX8881EUT18, MAX8881EUT25, MAX8881EUT33, and MAX8881EUT50 - share identical pinout, package dimensions, and thermal characteristics. This allows direct substitution between voltage options without PCB layout changes, provided the application's output voltage requirement matches the selected variant.
MAX8881EUT33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Strip
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.2V @ 50mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 10 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX8881EUT33 FAQ
1.How can I place an order for MAX8881EUT33 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8881EUT33 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX8881EUT33 reliable?
The price and inventory of MAX8881EUT33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8881EUT33 is usually 5 days.
3.What payment methods are accepted for MAX8881EUT33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8881EUT33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8881EUT33?
MAX8881EUT33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8881EUT33 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX8881EUT33?
For technical support, including MAX8881EUT33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8881EUT33 requirements.
6.How does Aetrix verify that MAX8881EUT33 is sourced from the original manufacturer or authorized distributors?
All MAX8881EUT33 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX8881EUT33 meets industry standards.
7.What is the process for return or replacement of MAX8881EUT33?
All MAX8881EUT33 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8881EUT33, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX8881EUT33 part is unused and in its original packaging.
Return procedure for MAX8881EUT33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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