My Inquiry
My Account
Microchip Technology MCP1811AT-040/LT
- Part No.:
- MCP1811AT-040/LT
- Manufacturer:
- Microchip Technology
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MCP1811AT-040/LT.pdf
- Description:
- IC REG LINEAR 4V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,983
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MCP1811AT-040/LT from Microchip Technology is a 150 mA ultra-low-quiescent-current LDO linear regulator with fixed 4.0 V output, 250 nA typical operating current, and output discharge functionality (MCP1811A variant). It operates from 1.8V to 5.5V input and is stable with a 1.0 µF ceramic output capacitor-designed for energy harvesting and long-life battery-powered medical wearables.
For engineers reviewing the MCP1811AT-040/LT datasheet, MCP1811AT-040/LT pinout, MCP1811AT-040/LT application, or MCP1811AT-040/LT equivalent, this page delivers verified electrical specs, package mapping to 3-lead SOT-23, shutdown behavior (10 nA typ.), dropout voltage (400 mV at 150 mA), and real-world use cases in hearing aids and smart bracelets where microamp-level sleep current is critical.
Technical Context
The MCP1811AT-040/LT implements a low-dropout linear regulation architecture with internal error amplifier, overcurrent protection, and an integrated discharge transistor activated during shutdown (SHDN = GND). Its feedback network is factory-trimmed for 4.0 V ±4% output accuracy across –40°C to +85°C junction temperature.
It features active output discharge (MCP1811A series), enabling rapid VOUT decay to prevent back-powering of downstream circuitry. The device draws only 10 nA typical supply current in shutdown mode and maintains stability without external compensation when paired with ≥1.0 µF X7R ceramic output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0 V ±4% - ensures precise biasing for 3.3V/4.0V logic interfaces and analog sensors without external resistors. |
| Max Output Current | 150 mA - supports moderate-current peripherals like BLE radios or low-power microcontrollers in compact wearable designs. |
| Quiescent Current | 250 nA typical - enables multi-year operation on coin cells (e.g., CR2032) in always-on monitoring applications. |
| Shutdown Current | 10 nA typical - minimizes leakage during deep-sleep modes, critical for energy-harvesting systems with intermittent power sources. |
| Dropout Voltage | 400 mV at 150 mA - allows regulation down to VIN = 4.4 V, maximizing usable battery voltage range from 4.2V Li-ion cells. |
| Input Voltage Range | 1.8 V to 5.5 V - compatible with single-cell Li-ion, LiFePO₄, alkaline, and energy-harvesting transducers (e.g., solar, thermal). |
| Stability Capacitor | 1.0 µF ceramic (X7R) - reduces BOM count and PCB area vs. tantalum alternatives while lowering output noise. |
Pinout & Package
Package: 3-Lead SOT-23 (SC-59), JEDEC MO-178AA compliant, 2.92 mm × 1.3 mm footprint with exposed pad option not present in this variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input voltage supply | Accepts 1.8–5.5 V DC input; requires local 1 µF ceramic bypass capacitor to minimize PSRR degradation. |
| 2 (GND) | Ground reference | Low-impedance return path for regulator ground current only; must connect directly to output capacitor ground node for optimal noise rejection. |
| 3 (VOUT) | Regulated output | Delivers stable 4.0 V ±4%; requires ≥1.0 µF X7R ceramic capacitor for loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 250 nA typical - extends battery life in devices that spend >99% time in sleep state (e.g., monthly-reporting IoT sensors). |
| Active output discharge | 100 Ω typical RDCH - discharges VOUT to <0.1 V within microseconds after shutdown, preventing latch-up in cascaded power domains. |
| Ceramic-capacitor stability | Stable with 1.0 µF X7R - eliminates need for ESR-tuned capacitors, reducing cost and board space versus legacy LDOs. |
| Overcurrent protection | Foldback limit at 50 mA - protects against short-circuit faults while limiting thermal stress during sustained overload. |
| Wide temperature range | –40°C to +85°C operating junction - qualified for medical wearables and industrial edge nodes exposed to ambient thermal cycling. |
Applications
| Energy Harvesting Node | Smart Hearing Aid |
|---|---|
|
Use Scenario: Indoor light-powered sensor node harvesting ~10–50 µW from ambient LED lighting, storing energy in a 100 µF supercapacitor. IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable 4.0 V to an ultra-low-power MCU and BLE transceiver during burst transmissions. Use Value: 250 nA quiescent current enables >6-month runtime between harvest cycles; 1.0 µF ceramic capacitor fits tight 3×3 mm PCB area constraints. |
Use Scenario: Miniaturized in-the-ear hearing aid powered by a 35 mAh zinc-air battery, requiring continuous analog front-end bias and digital signal processing. IC Role / Device Role / Timing Role: Main power rail regulator supplying 4.0 V to MEMS microphone preamp and low-latency DSP core. Use Value: 10 nA shutdown current preserves battery during user removal; output discharge prevents audio pop on power-up/down transitions. |
| Medical Bracelet Monitor | Long-Life Smart Card |
|
Use Scenario: Wrist-worn vital sign monitor logging ECG and SpO₂ every 5 minutes, powered by a 120 mAh LiPo cell. IC Role / Device Role / Timing Role: System LDO providing clean 4.0 V to ADC, op-amps, and RF section during brief active windows. Use Value: 400 mV dropout enables full utilization of battery's 4.2 V → 3.0 V discharge curve; ±4% output tolerance meets clinical-grade sensor accuracy requirements. |
Use Scenario: Contactless payment card with embedded secure element and NFC interface, powered solely by RF field coupling. IC Role / Device Role / Timing Role: Regulator converting harvested NFC carrier energy into stable 4.0 V for cryptographic operations and memory access. Use Value: 1.8 V minimum input allows operation under weak-field conditions; 250 nA IQ maximizes charge accumulation time before transaction execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-4002E/MB | Same 4.0 V output, but 1.6 µA IQ (6.4× higher) and no output discharge; SOT-23-3 package. | Lacks active discharge - unsuitable where fast VOUT decay is required to avoid back-powering. | Select when lowest possible cost is prioritized over nanoamp sleep current and discharge control. |
| TN0704-400 | 4.0 V output, 300 nA IQ, no discharge, 200 mA output; SC-70-3 package (smaller footprint). | Higher max load current but no discharge path - limits use in systems with strict power sequencing. | Choose for space-constrained designs needing margin above 150 mA, accepting trade-off in shutdown behavior. |
Compared with MCP1700T-4002E/MB and TN0704-400, the MCP1811AT-040/LT uniquely combines sub-µA quiescent current, guaranteed output discharge, and 150 mA capability in SOT-23 - making it the only choice for battery-powered medical devices requiring both ultra-low leakage and controlled power-down sequencing.
Availability
MCP1811AT-040/LT is available at Aetrix Electronics and suitable for energy harvesting nodes, wearable medical monitors, and smart card systems requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MCP1811AT-040/LT 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
Microchip Technology Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP1811A/B family was designed specifically for ultra-low-power battery and energy-harvesting applications-emphasizing nanoamp quiescent current, minimal external components, and robust operation across wide temperature and load ranges.
FAQ
What is the output voltage tolerance of the MCP1811AT-040/LT over temperature and load?
The MCP1811AT-040/LT delivers 4.0 V with ±4% tolerance across –40°C to +85°C junction temperature and load currents from 0 to 150 mA. This specification is guaranteed per DS20006088C, Table 1-1, and includes line regulation (±20 mV) and load regulation (±25 mV) contributions under defined test conditions.
Does the MCP1811AT-040/LT require an external shutdown control signal?
No-the MCP1811AT-040/LT does not include a SHDN pin. As a 3-pin SOT-23 variant in the MCP1811A series, it lacks enable/disable functionality and operates continuously when VIN is applied. For shutdown capability, engineers must select 5-pin variants like MCP1811A-400/DB or MCP1811A-400/MB.
Can the MCP1811AT-040/LT be used with a 100 nF ceramic output capacitor?
No-DS20006088C specifies a minimum 1.0 µF X7R ceramic output capacitor for stability. Using 100 nF violates the stability requirement and risks oscillation, especially under dynamic load steps. The 1.0 µF value is validated for phase margin >45° across all operating conditions.
What is the thermal resistance (θJA) of the MCP1811AT-040/LT in its SOT-23 package?
The MCP1811AT-040/LT in 3-lead SOT-23 has a typical θJA of 211.33°C/W on a JEDEC-standard 4-layer FR4 board with 1 oz. copper. This value assumes standard layout practices; adding thermal vias under the pad (if present) or increasing copper area can reduce effective θJA by up to 30%.
Is the MCP1811AT-040/LT RoHS-compliant and halogen-free?
Yes-the MCP1811AT-040/LT is RoHS-compliant and halogen-free per Microchip's Material Declaration (MD-10000181), meeting JEDEC J-STD-609B Class 1 requirements. The "/LT" suffix denotes lead-free, matte tin finish on the SOT-23 leads.
MCP1811AT-040/LT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 4V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 0.5 µA
- Current - Supply (Max):
- 110 µA
- PSRR:
- 50dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MCP1811AT-040/LT FAQ
1.How can I place an order for MCP1811AT-040/LT through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1811AT-040/LT 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 MCP1811AT-040/LT reliable?
The price and inventory of MCP1811AT-040/LT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1811AT-040/LT is usually 5 days.
3.What payment methods are accepted for MCP1811AT-040/LT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1811AT-040/LT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1811AT-040/LT?
MCP1811AT-040/LT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1811AT-040/LT 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 MCP1811AT-040/LT?
For technical support, including MCP1811AT-040/LT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1811AT-040/LT requirements.
6.How does Aetrix verify that MCP1811AT-040/LT is sourced from the original manufacturer or authorized distributors?
All MCP1811AT-040/LT 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 MCP1811AT-040/LT meets industry standards.
7.What is the process for return or replacement of MCP1811AT-040/LT?
All MCP1811AT-040/LT units undergo pre-shipment inspection (PSI). If there is an issue with MCP1811AT-040/LT, 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 MCP1811AT-040/LT part is unused and in its original packaging.
Return procedure for MCP1811AT-040/LT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP1811AT-040/LT Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
