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Analog Devices Inc./Maxim Integrated MAX6861UK30+T
- Part No.:
- MAX6861UK30+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6861UK30+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,670
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Product details
Overview
MAX6861UK30+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.000V reset threshold (±2.5%), and pin-selectable 10ms/150ms minimum reset timeout. It provides active-low push-pull RESET output, manual reset input (MR), and reset timeout selection via CT pin - designed for reliable power-on reset and brownout protection in battery-powered medical and portable electronics.
For engineers reviewing the MAX6861UK30+T datasheet, MAX6861UK30+T pinout, MAX6861UK30+T application, or MAX6861UK30+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), pin-selectable timeout configuration, and compatibility with low-voltage µP systems operating from 1.2V to 5.5V.
Technical Context
The MAX6861UK30+T integrates a precision voltage monitor, manual reset controller, and configurable reset timeout generator - with no external components required. Its CT pin selects between two factory-set timeout options (D1: 10ms min or D3: 150ms min), and MR is internally pulled up to VCC via 10kΩ.
Reset assertion occurs when VCC falls below 3.000V (±2.5%), MR is driven low, or during power-up/brownout; RESET remains asserted for the selected timeout period after VCC rises above threshold and MR deasserts. Guaranteed operation from -40°C to +85°C supports industrial and medical-grade deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V - enables multi-year battery life in glucose monitors and wearables. |
| Reset Threshold Voltage | 3.000V ±2.5% - precisely matches 3.0V system rails; valid down to VCC = 1.1V. |
| Reset Timeout Options | 10ms or 150ms (min) - selected by CT pin logic level; eliminates need for external timing components. |
| Reset Output Type | Active-low push-pull - drives directly into µP reset input without pullup resistor. |
| MR Input Behavior | Active-low with 10kΩ internal pullup - supports momentary switch or CMOS logic interface; 1µs minimum pulse width. |
| Operating Voltage Range | 1.2V to 5.5V - supports Li-ion, coin-cell, and multi-rail embedded systems. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CT | Reset timeout select input: logic low → 10ms min timeout (D1); logic high → 150ms min timeout (D3). |
| 2 | GND | Ground reference for all internal circuitry; must connect to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); initiates reset when pulled ≤0.3×VCC. |
| 4 | RESET | Active-low push-pull reset output; sinks ≥50µA at VCC ≥1.1V; asserts low during fault conditions. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in always-on medical sensors. |
| Pin-selectable timeout | Single CT pin configures 10ms or 150ms reset hold time - no external RC network needed. |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V - ensures robust reset assertion during deep brownout. |
| Transient immunity | Immune to VCC glitches <40µs duration at 100mV overdrive - prevents false resets in noisy environments. |
| No external components | Self-contained supervision: no capacitors, resistors, or trimming required for basic operation. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.0V rail powering ADC, RF SoC, and sensor interface; asserts RESET on battery sag or cold-start undervoltage. Use Value: Prevents firmware corruption during coin-cell voltage droop; 170nA ICC extends disposable sensor life beyond FDA-mandated 14-day wear period. |
Use Scenario: Portable ECG patch with rechargeable LiPo battery and ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Monitors main 3.0V supply and triggers hard reset if VCC drops below 3.000V during wireless firmware update. Use Value: Ensures deterministic boot state after brownout; 150ms timeout (CT = high) accommodates slow LDO recovery in multi-rail power sequencing. |
| Smart Wearables | Industrial Handheld Terminals |
|
Use Scenario: Fitness tracker with OLED display, motion sensor, and BLE radio operating from single-cell Li-ion. IC Role / Device Role / Timing Role: Provides power-on reset and brownout detection for 3.0V system rail; MR pin enables user-initiated soft reset via button press. Use Value: CT pin configured for 10ms timeout (CT = low) enables fast recovery from transient dips during display backlight activation. |
Use Scenario: Ruggedized barcode scanner with wide-temperature operation (-40°C to +85°C) and flash memory retention. IC Role / Device Role / Timing Role: Supervises 3.0V core voltage during cold storage and rapid temperature ramp; guarantees RESET assertion even at VCC = 1.1V. Use Value: Eliminates risk of corrupted flash writes during thermal shock-induced voltage collapse; meets IEC 60601-1 safety-critical reset requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.08V reset threshold (±0.5%), 200ms fixed timeout, 1.6µA ICC - higher quiescent current than MAX6861UK30+T. | Lacks pin-selectable timeout and MR input; suited for simpler reset-only applications without manual intervention. | Select when tighter threshold accuracy (±0.5% vs ±2.5%) is prioritized over ultra-low power and configurability. |
| STM6315SW33DX | 3.08V threshold (±2%), 140ms timeout, 1.2µA ICC, open-drain RESET - no CT pin or MR input. | Requires external pullup; no manual reset capability; not suitable for systems needing operator-initiated reset. | Choose for cost-sensitive industrial controls where open-drain flexibility and ST's long-term supply assurance outweigh nanopower needs. |
Compared with TPS3836K33DBVR and STM6315SW33DX, the MAX6861UK30+T delivers 70× lower supply current, field-configurable timeout via CT, and integrated MR functionality - making it uniquely suited for battery-critical medical and portable applications requiring both reliability and longevity.
Availability
MAX6861UK30+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, smart wearables, and industrial handheld terminals requiring stable component supply across extended product lifecycles.
Supply support for MAX6861UK30+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX68xx family delivers nanopower supervisory solutions optimized for battery-powered medical instrumentation and portable electronics - emphasizing ultra-low ICC, guaranteed low-VCC reset validity, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6861UK30+T?
The MAX6861UK30+T has a factory-trimmed reset threshold voltage of 3.000V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in the Threshold Suffix Guide (suffix "30") and Electrical Characteristics table, where VTH = 3.000V (min 2.925V, max 3.075V). The MAX6861UK30+T maintains valid reset assertion down to VCC = +1.1V.
How does the CT pin configure reset timeout on the MAX6861UK30+T?
The CT pin on the MAX6861UK30+T selects between two minimum reset timeout periods: logic low (≤0.2×VCC) selects D1 = 10ms (min), and logic high (≥0.8×VCC) selects D3 = 150ms (min). This is defined in Table 1 and Pin Description section. The timeout period updates only after the current reset cycle completes - enabling dynamic reconfiguration without interrupting supervision.
Does the MAX6861UK30+T include a watchdog timer function?
No, the MAX6861UK30+T does not include a watchdog timer. Per the Selector Guide and Pin Configurations, MAX6861–MAX6863 variants feature CT and MR but omit WDI - unlike MAX6864–MAX6869 which integrate watchdog inputs. The MAX6861UK30+T provides voltage monitoring, manual reset, and pin-selectable timeout only.
What is the supply current specification for the MAX6861UK30+T at 1.8V?
The MAX6861UK30+T draws 170nA typical supply current at VCC = 1.8V, TA = +25°C, with reset output deasserted (ICC condition per Electrical Characteristics table). At VCC < VTH (reset asserted), ICC rises to 7µA (typ). This ultra-low 170nA ICC enables multi-year operation on coin-cell batteries in always-on medical sensors.
Is the MAX6861UK30+T pin-compatible with other supervisory ICs?
Yes, the MAX6861UK30+T is pin-compatible with the TPS3836/TPS3837/TPS3838 family per the Features section, sharing identical 5-pin SOT23 layout and function mapping (CT ≡ SENSE, MR ≡ MR, RESET ≡ RESET, VCC ≡ VCC, GND ≡ GND). However, TPS383x parts lack CT functionality and offer fixed timeout - requiring PCB redesign only if leveraging the MAX6861UK30+T's pin-selectable feature.
MAX6861UK30+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6861UK30+T FAQ
1.How can I place an order for MAX6861UK30+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6861UK30+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 MAX6861UK30+T reliable?
The price and inventory of MAX6861UK30+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6861UK30+T is usually 5 days.
3.What payment methods are accepted for MAX6861UK30+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6861UK30+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6861UK30+T?
MAX6861UK30+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6861UK30+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 MAX6861UK30+T?
For technical support, including MAX6861UK30+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6861UK30+T requirements.
6.How does Aetrix verify that MAX6861UK30+T is sourced from the original manufacturer or authorized distributors?
All MAX6861UK30+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 MAX6861UK30+T meets industry standards.
7.What is the process for return or replacement of MAX6861UK30+T?
All MAX6861UK30+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6861UK30+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 MAX6861UK30+T part is unused and in its original packaging.
Return procedure for MAX6861UK30+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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