My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6855UK39D6+T
- Part No.:
- MAX6855UK39D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6855UK39D6+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,357
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6855UK39D6+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, 3.9V factory-trimmed reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and guaranteed reset validity down to VCC = +1.1V. It monitors supply voltage for brownout detection in ultra-low-power portable systems.
For engineers reviewing the MAX6855UK39D6+T datasheet, MAX6855UK39D6+T pinout, MAX6855UK39D6+T application, or MAX6855UK39D6+T equivalent, key selection criteria include reset threshold accuracy, ultra-low 170nA typical supply current, MR timing behavior (250ns delay), immunity to short VCC transients, and compatibility with 1.2V–5.5V supply rails.
Technical Context
The MAX6855UK39D6+T implements a precision bandgap-based voltage monitor with 2.5% threshold hysteresis and internal reset timer logic. Its active-high push-pull RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load when asserted, while sourcing ≥0.8×VCC when deasserted.
It includes an internally pulled-up MR input (10kΩ) requiring only a 1µs minimum pulse width and rejecting glitches <200ns. No external components are needed - operation is self-contained within the 5-pin SOT23 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.900V (min), 3.998V (typ), 4.095V (max); factory-trimmed ±2.5% over -40°C to +85°C |
| Reset Timeout | 600ms (min), 900ms (typ), 1200ms (max); fixed D6 option ensures reliable µP initialization after power recovery |
| Supply Current | 170nA (typ) at VCC = 1.8V; enables multi-year battery life in always-on medical and portable devices |
| VCC Operating Range | 1.2V to 5.5V; supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| RESET Output Type | Active-high push-pull; eliminates need for external pullup and simplifies interface to µP reset inputs |
| MR Input Behavior | Internally pulled up to VCC (10kΩ); accepts CMOS logic levels and requires no external debounce circuitry |
| Reset Validity | Guaranteed down to VCC = +1.1V; ensures deterministic reset assertion during deep brownout conditions |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high upon VCC drop below threshold or MR assertion, remains high for full timeout period |
| 2, 4 | GND | Ground reference for all internal circuitry; both pins must be connected to common system ground |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); asserts reset on logic-low transition |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical ICC enables >10-year battery life in glucose monitors and wearables |
| Factory-trimmed reset threshold | 3.9V ±2.5% eliminates calibration overhead and reduces BOM count vs. adjustable supervisors |
| Fixed 1200ms reset timeout | D6 option ensures sufficient hold time for slow-starting µPs and peripherals after power recovery |
| MR glitch rejection | 200ns immunity prevents spurious resets from EMI or switch bounce in handheld interfaces |
| No external components required | Self-contained operation reduces PCB area, assembly cost, and qualification effort |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Continuous glucose monitoring patch operating from CR2032 coin cell with strict 10-year shelf-life requirement. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-high RESET to ARM Cortex-M0+ during brownout, ensuring firmware restarts only after stable 3.3V rail recovery. Use Value: 170nA supply current extends battery life; 3.9V threshold matches LDO output tolerance; 1200ms timeout accommodates slow analog front-end stabilization. | Use Scenario: Wireless environmental sensor node powered by single alkaline AA cell, transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Supervisory circuit monitoring VCC decay and triggering controlled µP reset before undervoltage lockout corrupts flash writes. Use Value: Guaranteed reset validity to 1.1V prevents undefined state at end-of-life; MR pin allows OTA firmware update reset via GPIO. |
| Wearable Fitness Trackers | Low-Power Industrial Handhelds |
Use Scenario: Optical heart-rate monitor with photodiode array and BLE SoC, powered by rechargeable LiPo. IC Role / Device Role / Timing Role: Active-high RESET output directly tied to SoC reset pin; MR used for user-initiated soft reset via capacitive button. Use Value: Push-pull output eliminates pullup resistor (saving board space); 250ns MR-to-reset delay ensures immediate response to user action. | Use Scenario: Ruggedized barcode scanner with cold-temperature operation (-20°C) and intermittent duty cycle. IC Role / Device Role / Timing Role: Brownout detector preventing corrupted EEPROM writes during battery swap or low-temp discharge. Use Value: Reset threshold hysteresis (0.5%VTH) avoids chatter near trip point; 1.2V–5.5V range supports wide-input buck-boost regulator output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.08V fixed threshold, 200ms timeout, open-drain output, 1.6µA ICC | Lacks MR input; higher supply current limits battery lifetime in multi-year deployments | Select when lower-cost open-drain interface suffices and MR is not required |
| STM6315SW39FD6F | 3.9V threshold, 1200ms timeout, push-pull active-low output, 1.2µA ICC | Active-low RESET requires level-shifting or µP compatibility check; no MR pin | Choose for ST ecosystem designs where active-low reset is standard and MR is unused |
Compared with TPS3837K33DBVR and STM6315SW39FD6F, the MAX6855UK39D6+T uniquely combines ultra-low 170nA current, active-high push-pull output, and integrated MR-enabling simpler, longer-life designs without external components or logic inversion.
Availability
MAX6855UK39D6+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, wearable fitness trackers, and low-power industrial handhelds requiring stable component supply across extended production lifecycles.
Supply support for MAX6855UK39D6+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) designs precision analog and mixed-signal ICs for power, sensing, connectivity, and security applications in industrial, medical, and consumer markets.
The MAX685x family delivers nanopower supervisory functionality targeting ultra-low-power portable and battery-critical systems where supply current, reset accuracy, and integration are primary design constraints.
FAQ
What is the exact reset threshold voltage of MAX6855UK39D6+T?
The MAX6855UK39D6+T has a factory-trimmed reset threshold of 3.900V (minimum), 3.998V (typical), and 4.095V (maximum) at -40°C to +85°C, with ±2.5% tolerance. This corresponds to the "39" suffix per Maxim's Threshold Suffix Guide (Table 2), and is guaranteed over temperature and supply voltage variations.
Does MAX6855UK39D6+T include a watchdog timer function?
No, the MAX6855UK39D6+T does not include a watchdog timer. It belongs to the MAX6854/MAX6855/MAX6856 subgroup, which provides voltage monitoring and manual reset only. Watchdog functionality is present only in MAX6864–MAX6869 variants (e.g., MAX6864UK39D6S+T).
What is the reset timeout period for MAX6855UK39D6+T?
The MAX6855UK39D6+T uses the D6 reset timeout option, providing a minimum reset timeout period of 600ms, typical of 900ms, and maximum of 1200ms after VCC rises above the reset threshold or MR is deasserted. This fixed timeout ensures reliable µP initialization in slow-starting systems.
Can MAX6855UK39D6+T operate with supply voltages below 1.8V?
Yes, the MAX6855UK39D6+T operates from VCC = 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1.1V. At 1.2V, its supply current is 190nA (typ), making it suitable for single-cell NiMH or low-VCC energy-harvesting systems.
Is MAX6855UK39D6+T pin-compatible with other MAX685x devices?
Yes, all MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869 devices share identical 5-pin SOT23-5 pinouts and footprints. The MAX6855UK39D6+T uses pins 1 (RESET), 2/4 (GND), 3 (MR), and 5 (VCC), matching the mechanical and solder-layout requirements of the full family.
MAX6855UK39D6+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.9V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6855UK39D6+T FAQ
1.How can I place an order for MAX6855UK39D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6855UK39D6+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 MAX6855UK39D6+T reliable?
The price and inventory of MAX6855UK39D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6855UK39D6+T is usually 5 days.
3.What payment methods are accepted for MAX6855UK39D6+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6855UK39D6+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6855UK39D6+T?
MAX6855UK39D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6855UK39D6+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 MAX6855UK39D6+T?
For technical support, including MAX6855UK39D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6855UK39D6+T requirements.
6.How does Aetrix verify that MAX6855UK39D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6855UK39D6+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 MAX6855UK39D6+T meets industry standards.
7.What is the process for return or replacement of MAX6855UK39D6+T?
All MAX6855UK39D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6855UK39D6+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 MAX6855UK39D6+T part is unused and in its original packaging.
Return procedure for MAX6855UK39D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6855UK39D6+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
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…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
