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Analog Devices Inc./Maxim Integrated MXD1816UR29+T
- Part No.:
- MXD1816UR29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1816UR29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,356
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Product details
Overview
MXD1816UR29+T from Maxim Integrated is a low-power, open-drain, active-low microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It monitors VCC and asserts RESET when supply voltage falls below 2.88V (±2.5%), maintains reset for ≥100ms after VCC recovery, includes internal 5.5kΩ pullup resistor, and operates across –40°C to +105°C in SOT23-3 package - used in portable battery-powered controllers and embedded μC monitoring.
For engineers reviewing the MXD1816UR29+T datasheet, MXD1816UR29+T pinout, MXD1816UR29+T application, or MXD1816UR29+T equivalent, key selection criteria include reset threshold accuracy (±2.5%), guaranteed RESET validity down to VCC = +1V, open-drain output compatibility with bidirectional μP reset pins, and immunity to sub-5µs VCC transients.
Technical Context
The MXD1816UR29+T implements a precision bandgap-based voltage comparator with factory-trimmed 2.88V reset threshold, coupled to a monostable timeout circuit that guarantees ≥100ms reset assertion after VCC rises above VTH. Its open-drain RESET output interfaces directly with bidirectional microcontroller reset inputs without external pullups.
Unlike push-pull variants (e.g., MXD1812), MXD1816UR29+T lacks manual-reset debounce logic and push-button detection - it responds only to VCC brownout events, not external RESET pin transitions. It draws just 4µA typical supply current at +3.6V and remains functional down to VCC = +1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.88V ±2.5% - ensures reliable reset initiation during 2.5V/3.0V/3.3V system brownouts |
| Reset Timeout Period | 100ms min - holds processor in reset long enough for stable power rail recovery | Supply Current | 4µA typ at +3.6V - enables multi-year operation in battery-backed portable equipment |
| Operating Voltage Range | +1.0V to +5.5V - guarantees RESET logic state integrity even during deep undervoltage conditions |
| Output Type | Open-drain, active-low - allows wired-OR configuration and direct interface with bidirectional μP reset pins |
| Internal Pullup | 5.5kΩ - eliminates need for external resistor when driving standard CMOS inputs |
| Temperature Range | –40°C to +105°C - supports industrial and extended-temperature embedded deployments |
Pinout & Package
MXD1816UR29+T is housed in a 3-pin SOT23 package (U3-1 outline, 90-0179 land pattern), with 1.3mm × 2.9mm footprint and 1.1mm height - compatible with high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output | Drives low during VCC brownout; floats high otherwise; internal 5.5kΩ pullup to VCC enables direct connection to μP reset input |
| 2 (VCC) | Power supply and reset threshold reference input | Monitors system supply; device functions correctly down to +1.0V; comparator ignores transients <5µs |
| 3 (GND) | Ground reference | Common return path for internal comparator and output stage; must be low-impedance for accurate threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.88V reset threshold | Factory-trimmed ±2.5% over –40°C to +105°C - eliminates calibration and ensures consistent brownout response across temperature |
| No external components required | Integrated pullup, comparator, and timer - reduces BOM count and board area vs. discrete reset solutions |
| Low 4µA supply current | Enables use in always-on, energy-constrained applications such as IoT sensor nodes and wearables |
| VCC = +1.0V RESET validity | Guarantees defined logic state on RESET pin even during severe undervoltage - prevents spurious processor wake-up |
| Transient-immune comparator | Rejects VCC glitches <5µs duration - avoids false resets caused by switching noise or ESD-induced dips |
Applications
| Portable/Battery-Powered Equipment | Critical μP and μC Monitoring |
|---|---|
Use Scenario: Power management in handheld medical devices with coin-cell backup and intermittent wake-up cycles. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers controlled μC reset on battery sag below 2.88V. Use Value: Prevents firmware corruption during brownout by enforcing ≥100ms reset hold time while preserving ultra-low quiescent current. | Use Scenario: Industrial PLC controller requiring deterministic restart after AC line interruption. IC Role / Device Role / Timing Role: Monitors 3.3V FPGA configuration supply and asserts open-drain RESET to multiple downstream logic blocks. Use Value: Wired-OR capability allows shared reset bus; internal pullup avoids external component; 2.88V threshold matches 3.3V LDO dropout margin. |
| Intelligent Instruments | Set-Top Boxes |
Use Scenario: Digital multimeter with auto-ranging ADC and real-time display update. IC Role / Device Role / Timing Role: Resets microcontroller upon 2.5V analog front-end supply dip to prevent measurement errors. Use Value: ±2.5% threshold accuracy ensures repeatable trip point across temperature; 4µA ICC extends battery life between calibrations. | Use Scenario: Consumer STB with HDMI-CEC control and standby power management. IC Role / Device Role / Timing Role: Provides clean reset to ARM Cortex-A53 SoC during 3.3V domain power-up sequencing. Use Value: Open-drain output interfaces natively with SoC's bidirectional reset pin; no external pullup needed; SOT23-3 fits tight layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD29+T | Same 2.88V threshold, 140ms min timeout, 3-pin SOT23, but push-pull output (no internal pullup) | Requires external pullup for bidirectional μP interfaces; higher ICC (15µA typ) | Select if push-pull drive strength >10mA sink is required or if RESET must remain valid down to VCC = 0V |
| TPS3808G33DBVR | 2.93V threshold, adjustable delay (1ms–10s), 6-pin SOT23, higher ICC (12µA), no internal pullup | Needs external resistor network for pullup; larger footprint; supports programmable timeout | Select if design requires configurable reset duration or tighter threshold tolerance (±0.5%) |
Compared with MXD1816UR29+T, MAX809TRD29+T offers stronger push-pull drive but adds external component overhead, while TPS3808G33DBVR provides timing flexibility at cost of size and current efficiency - MXD1816UR29+T uniquely balances ultra-low ICC, integrated pullup, and compact SOT23 for cost-sensitive portable designs.
Availability
MXD1816UR29+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC monitoring, intelligent instruments, and set-top boxes requiring stable component supply, RoHS-compliant packaging, and extended-temperature operation.
Supply support for MXD1816UR29+T 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MXD1810–MXD1818 family was designed specifically for low-cost, space-constrained microprocessor reset supervision in battery-operated and industrial embedded systems - emphasizing precision thresholding, minimal external components, and wide temperature operation.
FAQ
What is the exact reset threshold voltage of MXD1816UR29+T and how tightly is it specified?
The MXD1816UR29+T has a factory-set reset threshold of 2.88V, with guaranteed accuracy of ±2.5% over the full operating temperature range (–40°C to +105°C). This value is confirmed in the Electrical Characteristics table under "MXD181_ _ R29" row, where min/typ/max are 2.80V/2.88V/2.97V. The threshold is trimmed during production and does not require external calibration.
Does MXD1816UR29+T support manual reset via its RESET pin?
No, MXD1816UR29+T does not support manual reset detection. Unlike MXD1813/MXD1818 variants, it lacks debounced manual-reset logic. Its RESET pin is output-only: it asserts low only during VCC brownout events and floats high otherwise. External pushbutton functionality requires separate circuitry.
What is the function of the internal pullup resistor in MXD1816UR29+T and what is its nominal value?
The internal pullup resistor in MXD1816UR29+T connects the open-drain RESET pin to VCC and has a nominal value of 5.5kΩ (min 3.5kΩ, max 7.5kΩ). It ensures a defined high state on RESET when not actively driven low, eliminating the need for an external pullup resistor in most CMOS interface applications.
Can MXD1816UR29+T operate reliably when VCC drops below 2.0V?
Yes, MXD1816UR29+T is guaranteed to maintain valid RESET logic states down to VCC = +1.0V, as stated in both the General Description and Electrical Characteristics sections. Its comparator and output stage remain functional and predictable even at deep undervoltage - critical for fail-safe behavior in battery-depleted conditions.
What package type and footprint does MXD1816UR29+T use, and is it RoHS-compliant?
MXD1816UR29+T uses the 3-pin SOT23 package (U3-1 outline, land pattern 90-0179), with dimensions 1.3mm × 2.9mm × 1.1mm. The "+T" suffix explicitly denotes lead(Pb)-free, RoHS-compliant packaging per Maxim's ordering convention, verified in the Ordering Information and Package Information sections.
MXD1816UR29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.88V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MXD1816UR29+T FAQ
1.How can I place an order for MXD1816UR29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816UR29+T 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 MXD1816UR29+T reliable?
The price and inventory of MXD1816UR29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816UR29+T is usually 5 days.
3.What payment methods are accepted for MXD1816UR29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816UR29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1816UR29+T?
MXD1816UR29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816UR29+T 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 MXD1816UR29+T?
For technical support, including MXD1816UR29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816UR29+T requirements.
6.How does Aetrix verify that MXD1816UR29+T is sourced from the original manufacturer or authorized distributors?
All MXD1816UR29+T 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 MXD1816UR29+T meets industry standards.
7.What is the process for return or replacement of MXD1816UR29+T?
All MXD1816UR29+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816UR29+T, 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 MXD1816UR29+T part is unused and in its original packaging.
Return procedure for MXD1816UR29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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