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Analog Devices Inc./Maxim Integrated MAX6306UK31D3+
- Part No.:
- MAX6306UK31D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6306UK31D3+.pdf
- Description:
- MAX6306 5-PIN, MULTIPLE-INPUT, P
- Quantity:
- Payment:
- Shipping:
Inventory:10,104
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Product details
Overview
The MAX6306UK31D3+ from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC and one external undervoltage input (RST IN), asserting an active-low push/pull RESET output when either falls below its threshold. It features a factory-set 3.08V ±1.5% VCC reset threshold, 140ms (min) reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring reliable power-on and brownout reset for microcontrollers.
For engineers reviewing the MAX6306UK31D3+ datasheet, MAX6306UK31D3+ pinout, MAX6306UK31D3+ application, or MAX6306UK31D3+ equivalent, key selection criteria include its dual-input monitoring capability, manual-reset support, immunity to fast VCC transients, and compatibility with 3.3V/5V mixed-rail systems in portable and industrial control designs.
Technical Context
The MAX6306UK31D3+ integrates a factory-trimmed voltage divider to monitor VCC against a precise 3.08V threshold and a separate comparator for the RST IN pin referenced to 1.23V. Its internal timer guarantees a minimum 140ms reset assertion after all monitored supplies recover.
It includes a manual-reset (MR) input with 63.5kΩ internal pull-up, TTL/CMOS-compatible logic thresholds, and glitch rejection of ≤0.1µs. The push/pull RESET output sinks ≥1.2mA at VCC > 2.5V and sources ≥10µA at VCC > 1.0V, ensuring robust drive into µP reset pins without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V ±1.5% at +25°C; stable over -40°C to +85°C with 40ppm/°C drift - ensures accurate brownout detection in 3.3V systems. |
| Reset Timeout Period | 140ms (min); fixed factory-programmed - provides sufficient hold time for microcontroller initialization before release. |
| Supply Current | 8µA typical at +25°C; ≤16µA over full temperature range - enables use in battery-powered equipment with multi-year runtime. |
| RESET Output Type | Active-low push/pull - eliminates need for external pull-up resistor and supports direct interface with bidirectional µP reset I/O. |
| Manual-Reset Input | Internal 63.5kΩ pull-up; VIH = 0.7×VCC (VTH < 4.0V); VIL = 0.3×VCC - allows simple momentary switch interface without external components. |
| Operating VCC Range | 2.5% above threshold to +5.5V (i.e., 3.16V to 5.5V); RESET valid down to VCC = 1.0V - supports operation across 3.3V and 5V rails with safe low-voltage reset assertion. |
| Transient Immunity | Immune to VCC transients ≤100ns at 3.08V overdrive; RST IN immune to ≤100ns transients - prevents false resets from switching noise or ESD coupling. |
Pinout & Package
Package: 5-pin SOT23 (U5-1 footprint, lead-free variant U5+1), 2.9mm × 1.6mm × 1.1mm body, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives µP reset pin directly; sinks ≥1.2mA at VCC > 2.5V; no external pull-up required. |
| 2 - GND | System ground reference | Common return path for all internal comparators and output stage; must be low-impedance. |
| 3 - RST IN | Adjustable undervoltage reset input | Compares external voltage to 1.23V reference; used to monitor secondary rail (e.g., 1.8V, 2.5V) via resistor divider. |
| 4 - MR | Manual-reset input | Logic-low assertion forces RESET active; internal pull-up enables NC or VCC tie-off; debouncing not required. |
| 5 - VCC | Main supply and primary monitored rail | Power source and input to factory-trimmed divider; also defines operating range and RESET sourcing capability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monitoring | Simultaneously supervises VCC (3.08V threshold) and external rail via RST IN - enables single-IC supervision of 3.3V core + 1.8V I/O in compact systems. |
| No external components required | Factory-programmed threshold and timeout eliminate resistors, capacitors, or trim pots - reduces BOM count and layout area in space-constrained PCBs. |
| Guaranteed RESET validity to VCC = 1V | Push/pull output maintains defined logic state even during deep brownout - prevents µP latch-up or undefined startup behavior. |
| Immunity to fast VCC transients | Rejects glitches ≤100ns duration without asserting reset - critical for noisy switch-mode power supply environments. |
| Manual-reset with integrated pull-up | 63.5kΩ internal MR pull-up allows direct switch-to-GND connection - simplifies front-panel reset design and eliminates discrete resistor. |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
|
Use Scenario: Monitors 3.3V microcontroller supply and 2.5V sensor analog rail in a DIN-rail mounted controller exposed to 24V field wiring noise. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting active-low RESET to ARM Cortex-M4; provides 140ms power-on delay and transient-immune brownout response. Use Value: Prevents firmware corruption during 24V relay switching transients by ignoring sub-100ns spikes while reliably detecting sustained <3.08V dips. |
Use Scenario: Ensures deterministic boot in a handheld ECG device powered by a single Li-ion cell (2.7–4.2V) with 3.3V system rail and 1.8V ADC supply. IC Role / Device Role / Timing Role: Primary VCC supervisor (3.08V) plus RST IN monitoring 1.8V rail; RESET holds µP until both rails stabilize post-power-up. Use Value: 8µA quiescent current extends battery life; manual-reset button (MR) enables field recalibration without power cycle. |
| Automotive Body Control Module | Network Edge Gateway |
|
Use Scenario: Supervises 5V CAN transceiver supply and 3.3V MCU rail in a 12V automotive subsystem subject to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: VCC monitor (3.08V) detects 5V rail collapse; RST IN tracks 3.3V rail; RESET asserts on first fault and remains active for 140ms after recovery. Use Value: Factory-set threshold avoids calibration drift over temperature; push/pull output drives CAN controller reset without external components. |
Use Scenario: Provides fail-safe reset for a dual-core SoC in an industrial Ethernet gateway with separate 1.1V core, 3.3V I/O, and 5V PHY supplies. IC Role / Device Role / Timing Role: Monitors main 3.3V I/O rail (VCC) and secondary 5V PHY rail (via RST IN); MR pin enables remote firmware recovery via GPIO. Use Value: Manual-reset capability allows OTA update rollback; 140ms timeout ensures complete SoC initialization before peripheral enable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6309UK31D3+ | Includes overvoltage reset input (OVRST IN) in addition to RST IN and VCC monitoring; same 3.08V VCC threshold and 140ms timeout. | Required where 5V rail overvoltage protection (e.g., due to regulator failure) is mandated alongside undervoltage supervision. | Select MAX6309UK31D3+ only if OVRST IN functionality is needed; otherwise MAX6306UK31D3+ offers lower cost and identical core supervision. |
| TPS3808G33DBVR | Fixed 3.3V VCC threshold (±0.5%), 200ms timeout, 1.6µA IQ; open-drain RESET; no RST IN or MR inputs. | Suitable only for single-rail 3.3V systems without manual reset or auxiliary rail monitoring. | Choose TPS3808G33DBVR for ultra-low-power single-supply applications where dual monitoring and MR are unnecessary. |
Compared with MAX6309UK31D3+, the MAX6306UK31D3+ omits overvoltage detection but retains identical VCC/RST IN/MR functionality and timing - making it the optimal choice when only undervoltage supervision of two rails is required. Versus TPS3808G33DBVR, it adds critical flexibility (dual inputs, manual reset) at modest IQ trade-off.
Availability
The MAX6306UK31D3+ is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, automotive body electronics, and network edge gateways requiring stable component supply and long-term manufacturability.
Supply support for MAX6306UK31D3+ 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, automotive, communications, and computing markets.
The MAX6305–MAX6313 family was designed specifically for multivoltage microprocessor supervision in space-constrained, noise-prone systems - delivering precision reset thresholds, transient immunity, and flexible input configurations in minimal SOT23 packaging.
FAQ
What is the exact factory-set VCC reset threshold for MAX6306UK31D3+?
The MAX6306UK31D3+ has a nominal VCC reset threshold of 3.08V, with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. This value is factory-trimmed using an internal resistor divider and corresponds to the "31" in the part number per Table 1 of the datasheet.
Does MAX6306UK31D3+ support manual reset, and how is it implemented?
Yes, the MAX6306UK31D3+ includes a dedicated MR pin (Pin 4) with an internal 63.5kΩ pull-up resistor. Driving MR low forces RESET active; RESET remains asserted for the full 140ms timeout after MR returns high. No external components are needed - a momentary switch from MR to GND suffices.
Can MAX6306UK31D3+ monitor a 1.8V supply in addition to its 3.08V VCC rail?
Yes. The RST IN pin (Pin 3) accepts an external voltage divider to scale a 1.8V rail down to the internal 1.23V reference threshold. For example, using R1 = 464kΩ and R2 = 1MΩ yields VRST IN = 1.23V when VIN = 1.8V, triggering reset if the 1.8V rail drops below specification.
What is the minimum VCC voltage at which MAX6306UK31D3+ guarantees valid RESET output?
The MAX6306UK31D3+ guarantees RESET remains a valid active-low logic level down to VCC = 1.0V. Below this, output drive capability degrades; however, most microcontrollers cease operation below 1.0V, making this specification sufficient for reliable system reset sequencing.
Is MAX6306UK31D3+ pin-compatible with other members of the MAX6305–MAX6313 family?
Yes - all MAX6305–MAX6313 devices share the identical 5-pin SOT23 package and pinout (RESET, GND, RST IN/OVRST IN, MR, VCC). However, function varies: MAX6306UK31D3+ provides VCC + RST IN + MR, while MAX6307 adds OVRST IN, and MAX6305 offers dual RST IN inputs. Pin compatibility enables drop-in replacement only within same functional subset.
MAX6306UK31D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.08V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6306UK31D3+ FAQ
1.How can I place an order for MAX6306UK31D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6306UK31D3+ 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 MAX6306UK31D3+ reliable?
The price and inventory of MAX6306UK31D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6306UK31D3+ is usually 5 days.
3.What payment methods are accepted for MAX6306UK31D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6306UK31D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6306UK31D3+?
MAX6306UK31D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6306UK31D3+ 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 MAX6306UK31D3+?
For technical support, including MAX6306UK31D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6306UK31D3+ requirements.
6.How does Aetrix verify that MAX6306UK31D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6306UK31D3+ 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 MAX6306UK31D3+ meets industry standards.
7.What is the process for return or replacement of MAX6306UK31D3+?
All MAX6306UK31D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6306UK31D3+, 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 MAX6306UK31D3+ part is unused and in its original packaging.
Return procedure for MAX6306UK31D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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