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Analog Devices Inc./Maxim Integrated MAX6307UK35D3+
- Part No.:
- MAX6307UK35D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6307UK35D3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,811
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Product details
Overview
MAX6307UK35D3+ from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 3.5V reset threshold), an adjustable undervoltage input (RST IN), and an adjustable overvoltage input (OVRST IN) to assert a push/pull active-low RESET signal. It features 140ms minimum reset timeout, 8µA supply current, and guaranteed RESET validity down to VCC = 1V. It is used in multivoltage embedded systems requiring robust power-up sequencing and brownout protection.
For engineers reviewing the MAX6307UK35D3+ datasheet, MAX6307UK35D3+ pinout, MAX6307UK35D3+ application, or MAX6307UK35D3+ equivalent, key selection considerations include its triple-monitoring capability (VCC + RST IN + OVRST IN), factory-trimmed 3.5V VCC threshold with ±2.5% tolerance over -40°C to +85°C, 140ms reset timeout, SOT23-5 package compatibility, and immunity to fast VCC transients.
Technical Context
The MAX6307UK35D3+ implements a triple-input supervision architecture: internal factory-trimmed resistor divider sets the primary VCC reset threshold at 3.5V; external resistor dividers program RST IN (undervoltage) and OVRST IN (overvoltage) thresholds referenced to a 1.23V internal bandgap. Its push/pull RESET output drives low actively and pulls high via internal circuitry-no external pull-up required.
It uses a precision bandgap reference and comparator-based detection with built-in hysteresis (2.5mV on RST IN/OVRST IN, 2×VTH on VCC). The reset timeout timer starts only after all monitored voltages exceed their respective thresholds and holds RESET asserted for ≥140ms, ensuring reliable µP initialization during power ramp-up or recovery from brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.5V nominal, ±2.5% over -40°C to +85°C - ensures reliable 3.3V system monitoring with margin against ripple and drift |
| Reset Timeout Period | 140ms minimum - meets typical microprocessor power-on reset timing requirements without external RC components |
| Supply Current | 8µA typical at VCC = 5.5V - enables use in battery-powered portable equipment with minimal quiescent drain |
| RESET Output Type | Push/pull active-low - eliminates need for external pull-up resistor and supports direct interface to CMOS/TTL µP reset inputs |
| Operating Voltage Range | VCC = (3.5V × 1.025) to +5.5V = 3.59V to 5.5V - defines valid supply range for accurate VCC monitoring function |
| RST IN / OVRST IN Threshold | 1.23V ±0.03V internal reference - allows precise external resistor-divider programming of secondary supply thresholds |
| Transient Immunity | Immune to VCC transients <140µs at 100mV overdrive - prevents false resets during switching noise or load dump events |
Pinout & Package
MAX6307UK35D3+ is housed in a RoHS-compliant, lead-free 5-pin SOT23 package (package code U5+1, outline 21-0057), optimized for space-constrained PCB layouts and automated assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push/pull reset output - asserts low during fault conditions and releases high after timeout; drives µP reset pin directly |
| 2 | GND | System ground reference - must be connected to main system ground plane for stable comparator operation and noise immunity |
| 3 | RST IN | Adjustable undervoltage reset input - accepts external resistor divider to monitor secondary supply (e.g., 1.8V, 2.5V) below 1.23V threshold |
| 4 | OVRST IN | Adjustable overvoltage reset input - accepts external resistor divider to monitor overvoltage on any rail (e.g., 5V, 12V) above 1.23V reference |
| 5 | VCC | Main supply input and primary monitored rail - powers device and feeds internal trimmed divider for 3.5V threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent monitoring | Simultaneously supervises VCC (3.5V), RST IN (user-programmable undervoltage), and OVRST IN (user-programmable overvoltage) - enables full-rail health checking in multivoltage systems |
| No external components required | Factory-programmed threshold and timeout eliminate need for external resistors, capacitors, or trim pots - reduces BOM count and layout area |
| Guaranteed RESET validity to VCC = 1V | RESET remains logic-valid (VOL ≤ 0.3V at ISINK = 500µA) even as supply drops to 1V - ensures deterministic reset behavior during deep brownout |
| Immunity to short VCC transients | Rejects negative-going glitches <140µs duration at 100mV overdrive - prevents spurious resets in noisy power environments |
| Low 8µA supply current | Enables integration into always-on subsystems (e.g., RTC backup, wake-on-power-loss circuits) without impacting battery life |
Applications
| Industrial PLC I/O Module | Medical Patient Monitor |
|---|---|
|
Use Scenario: Monitors 3.3V logic rail, 5V analog supply, and 24V field bus voltage in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Primary VCC supervisor for 3.3V rail; RST IN monitors 5V analog supply via resistor divider; OVRST IN detects 24V field bus overvoltage. Use Value: Prevents firmware corruption during industrial power disturbances by asserting RESET within 1µs of fault detection and holding for ≥140ms. |
Use Scenario: Ensures safe boot and continuous operation of critical sensor acquisition circuitry powered by multiple isolated rails. IC Role / Device Role / Timing Role: Supervises main 3.3V MCU supply (VCC), 1.8V sensor interface rail (RST IN), and 5V display backlight (OVRST IN). Use Value: Guarantees µP reset assertion before any supply falls below operational minimum, eliminating erratic behavior during AC mains interruption or battery switchover. |
| Automotive Body Control Module | Telecom Remote Radio Unit |
|
Use Scenario: Validates 3.3V microcontroller supply, 5V CAN transceiver rail, and 12V vehicle battery voltage in under-hood electronics. IC Role / Device Role / Timing Role: VCC monitors 3.3V domain; RST IN tracks 5V via divider; OVRST IN watches 12V battery for overvoltage events (>15.5V). Use Value: Provides automotive-grade reset timing (140ms min) and thermal stability (–40°C to +85°C) while rejecting engine cranking transients. |
Use Scenario: Secures reliable startup and fault recovery in outdoor base station radios exposed to wide temperature swings and lightning-induced surges. IC Role / Device Role / Timing Role: Supervises 3.3V FPGA configuration rail (VCC), 2.5V RF synthesizer supply (RST IN), and 48V PoE input (OVRST IN). Use Value: Enables single-chip triple-rail supervision with overvoltage detection on high-voltage PoE input - reducing component count vs. discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable reset IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6307UK33D3+ | Factory-set VCC threshold = 3.3V (vs. 3.5V); otherwise identical pinout, timing, and feature set | Better suited for strict 3.3V ±5% systems where 3.5V threshold provides insufficient margin | Select when exact 3.3V rail supervision is required and 3.5V would trigger premature reset during nominal operation |
| TPS3808G33DBVR | Fixed 3.3V threshold, open-drain RESET output, 200ms timeout, higher 12µA ICC - no OVRST IN or RST IN inputs | Lacks dual adjustable inputs; requires external pull-up; suitable only for single-rail monitoring | Choose only if triple-input supervision is unnecessary and board space allows for external pull-up resistor |
Compared with MAX6307UK33D3+, the MAX6307UK35D3+ provides tighter alignment with 3.3V systems operating near upper tolerance limits, while versus TPS3808G33DBVR, it delivers integrated over/undervoltage monitoring on auxiliary rails without additional ICs or passives.
Availability
MAX6307UK35D3+ is available at Aetrix Electronics and suitable for industrial PLCs, medical patient monitors, automotive body control modules, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6307UK35D3+ 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, automotive, and communications applications.
The MAX6305–MAX6313 family was engineered specifically for multivoltage system supervision - enabling simultaneous monitoring of primary and auxiliary rails with factory-programmed accuracy and minimal external components.
FAQ
What is the factory-programmed VCC reset threshold for MAX6307UK35D3+?
The MAX6307UK35D3+ has a factory-trimmed VCC reset threshold of 3.5V nominal, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +85°C. This value is permanently set during manufacturing and cannot be adjusted. The "35" in the part number explicitly denotes the 3.5V threshold per Maxim's ordering convention.
Does MAX6307UK35D3+ require an external pull-up resistor on the RESET pin?
No, MAX6307UK35D3+ does not require an external pull-up resistor because it features a push/pull active-low RESET output. The internal driver actively pulls the pin low during reset assertion and actively drives it high when released, eliminating dependency on external passive components for proper logic-level signaling to the microprocessor.
Can MAX6307UK35D3+ monitor both overvoltage and undervoltage on the same external rail?
Yes, MAX6307UK35D3+ can monitor both overvoltage and undervoltage on a single external rail using separate resistor dividers on RST IN (for undervoltage) and OVRST IN (for overvoltage). Each input references the same 1.23V internal bandgap, allowing independent threshold programming - for example, detecting <2.4V (undervoltage) and >5.6V (overvoltage) on a 5V rail.
What is the minimum VCC voltage at which MAX6307UK35D3+ guarantees valid RESET output?
MAX6307UK35D3+ guarantees valid RESET output down to VCC = 1V, with VOL ≤ 0.3V at ISINK = 500µA. Below 1V, output drive capability degrades significantly. This specification ensures deterministic reset behavior during deep brownout conditions common in battery-backed or unregulated power systems.
Is MAX6307UK35D3+ compatible with lead-free PCB assembly processes?
Yes, MAX6307UK35D3+ is supplied in lead-free packaging (RoHS-compliant) and rated for reflow soldering at +260°C peak temperature per JEDEC J-STD-020. The "+" suffix in the part number explicitly indicates lead-free construction, and the device meets IPC/JEDEC moisture sensitivity level (MSL) 1 requirements for unlimited floor life at ≤30°C/60% RH.
MAX6307UK35D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.5V
- 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
MAX6307UK35D3+ FAQ
1.How can I place an order for MAX6307UK35D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6307UK35D3+ 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 MAX6307UK35D3+ reliable?
The price and inventory of MAX6307UK35D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6307UK35D3+ is usually 5 days.
3.What payment methods are accepted for MAX6307UK35D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6307UK35D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6307UK35D3+?
MAX6307UK35D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6307UK35D3+ 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 MAX6307UK35D3+?
For technical support, including MAX6307UK35D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6307UK35D3+ requirements.
6.How does Aetrix verify that MAX6307UK35D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6307UK35D3+ 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 MAX6307UK35D3+ meets industry standards.
7.What is the process for return or replacement of MAX6307UK35D3+?
All MAX6307UK35D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6307UK35D3+, 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 MAX6307UK35D3+ part is unused and in its original packaging.
Return procedure for MAX6307UK35D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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