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Analog Devices Inc./Maxim Integrated MAX6309UK42D3+
- Part No.:
- MAX6309UK42D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6309UK42D3+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:910
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Product details
Overview
The MAX6309UK42D3+ from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC (factory-set 4.2V reset threshold) and an external undervoltage input (RST IN), asserts active-low push/pull RESET during supply faults or manual reset, and features 140ms minimum reset timeout. It draws only 8µA supply current and guarantees valid RESET output down to VCC = 1V - ideal for dual-rail embedded systems requiring robust brownout protection.
For engineers reviewing the MAX6309UK42D3+ datasheet, MAX6309UK42D3+ pinout, MAX6309UK42D3+ application, or MAX6309UK42D3+ equivalent, key selection criteria include its factory-trimmed 4.2V ±2.5% VCC threshold, integrated MR input with 63.5kΩ internal pull-up, immunity to sub-1µs VCC transients, and guaranteed operation across -40°C to +85°C.
Technical Context
The MAX6309UK42D3+ implements a dual-monitoring architecture: one path uses an internal factory-trimmed resistor divider to monitor VCC against a 4.2V nominal threshold; the second path compares an external voltage at RST IN against a precise 1.23V internal reference. Both paths feed into a reset generator with a fixed 140ms minimum timeout period (D3 variant).
Its push/pull RESET output drives high/low without external pull-up, supports ISINK = 1.2mA at VCC > 2.5V (VOL ≤ 0.3V), and remains functional down to VCC = 1.0V. The MR input accepts TTL/CMOS logic levels, features glitch rejection (<0.1µs), and holds RESET active for the full tRP after release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.2V ±2.5% over -40°C to +85°C - sets brownout detection point for main system rail |
| RST IN Threshold | 1.23V ±0.03V - enables precise external voltage monitoring via resistor divider |
| Reset Timeout (tRP) | 140ms (min) - ensures µP initialization completes before release |
| Supply Current (ICC) | 8µA (typ) at VCC = 5.5V - enables multi-year battery life in portable systems |
| RESET Output Type | Active-low push/pull - eliminates need for external pull-up resistor |
| MR Input Pull-up | 63.5kΩ internal - allows direct switch-to-GND connection without external components |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: 5-pin SOT23 (U5+1), 2.9mm × 1.6mm footprint, RoHS-compliant lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives low to assert reset; sources current to pull high when released - no external pull-up required |
| 2 - GND | System ground reference | Return path for all internal comparators and output stage; must be low-impedance |
| 3 - RST IN | Adjustable undervoltage reset input | Compares external voltage (via resistor divider) to 1.23V reference; asserts reset if input falls below threshold |
| 4 - MR | Manual reset input | Logic-low assertion forces reset; internal 63.5kΩ pull-up enables switch-only interface |
| 5 - VCC | Main supply input & monitored rail | Power source and primary monitored voltage; internal divider sets 4.2V reset point |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed VCC threshold | 4.2V with ±2.5% tolerance over full temperature range - eliminates calibration effort |
| Dual independent monitoring paths | VCC + RST IN inputs allow simultaneous supervision of main rail and auxiliary supply (e.g., 3.3V I/O) |
| Transient immunity | Rejects VCC glitches <1µs wide - prevents spurious resets during switching noise |
| No external components required | Integrated pull-up on MR, precision reference, and reset timer - reduces BOM count and board space |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout - critical for fail-safe shutdown |
Applications
| Industrial PLC I/O Modules | Medical Portable Monitors |
|---|---|
|
Use Scenario: Monitoring both 5V logic supply and isolated 3.3V sensor interface rail in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting synchronized reset to FPGA and microcontroller upon either rail dropout. Use Value: Prevents partial configuration or corrupted register writes during asymmetric power loss - ensures deterministic state recovery. |
Use Scenario: Battery-powered ECG device with 3.3V MCU core and 5V analog front-end, requiring guaranteed reset during Li-ion discharge from 4.2V to 3.0V. IC Role / Device Role / Timing Role: Primary VCC monitor (4.2V threshold) plus RST IN monitoring 3.3V rail via divider - triggers reset before ADC reference collapse. Use Value: 8µA quiescent current extends battery life; 140ms timeout ensures complete analog settling before firmware boot. |
| Automotive Body Control Units | Network Edge Routers |
|
Use Scenario: Supervising 5V microcontroller supply and 12V CAN transceiver rail in under-hood junction boxes exposed to load dump transients. IC Role / Device Role / Timing Role: VCC monitor detects 5V rail collapse; RST IN tracks 12V rail via resistive divider - dual-trigger reset prevents CAN bus lockup. Use Value: -40°C to +85°C rating ensures reliability; transient immunity avoids false resets during alternator switching noise. |
Use Scenario: High-availability 1RU router with redundant 3.3V and 5V DC/DC outputs powering CPU, PHYs, and management MCU. IC Role / Device Role / Timing Role: Independent monitoring of both rails using VCC and RST IN inputs - asserts reset if either fails, preventing packet corruption. Use Value: Push/pull RESET drives multiple loads directly; 140ms timeout accommodates slowest power rail stabilization time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6312UK29D3+ | Factory-set VCC threshold = 2.9V (±2.5%), same D3 timeout and pinout | Targets 3.3V systems where lower VCC trip point is required; not suitable for 5V-centric designs | Select when main supply is 3.3V and brownout must trigger near 2.9V, not 4.2V |
| TPS3808G33DBVR | Fixed 3.3V threshold, 200ms timeout, SOT23-6 package, higher ICC (12µA) | Lacks RST IN input and MR pin - single-rail only; requires external pull-up on open-drain output | Choose for cost-sensitive 3.3V-only applications where dual monitoring is unnecessary |
Compared with MAX6309UK42D3+, MAX6312UK29D3+ offers identical functionality but a lower trip point for 3.3V systems, while TPS3808G33DBVR sacrifices flexibility (no RST IN/MR) and package compatibility for TI's production ecosystem and tighter 3.3V tolerance.
Availability
MAX6309UK42D3+ is available at Aetrix Electronics and suitable for industrial PLCs, medical portable monitors, automotive body control units, network edge routers, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6309UK42D3+ 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 industrial, automotive, and communications applications, emphasizing reliability, low power, and integration.
The MAX6305–MAX6313 family delivers programmable supervisory functions in ultra-small SOT23 packages, targeting space-constrained embedded systems needing dual-rail monitoring, manual reset, and guaranteed reset timing without external components.
FAQ
What is the exact factory-set VCC reset threshold for MAX6309UK42D3+?
The MAX6309UK42D3+ has a factory-trimmed VCC reset threshold of 4.2V, with a guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is permanently programmed during manufacturing and corresponds to the "42" in the part number per Maxim's Table 1. No external adjustment is possible for this VCC monitor path.
Does MAX6309UK42D3+ support monitoring a second voltage rail besides VCC?
Yes, MAX6309UK42D3+ supports monitoring a second voltage rail via its RST IN pin, which compares an externally applied voltage (using a resistor divider) against a precise 1.23V internal reference. This enables independent supervision of auxiliary supplies like 3.3V, 2.5V, or custom thresholds - a key differentiator from single-rail supervisors.
What is the function of the MR pin on MAX6309UK42D3+ and how is it used?
The MR (Manual Reset) pin on MAX6309UK42D3+ is an active-low input that forces RESET assertion when pulled below VIH (typically 0.7×VCC). It features a 63.5kΩ internal pull-up resistor, allowing direct connection to a momentary switch tied to GND. RESET remains active for the full 140ms timeout after MR is released, ensuring reliable system restart.
Can MAX6309UK42D3+ operate reliably during fast VCC transients?
Yes, MAX6309UK42D3+ is specifically designed to ignore fast VCC transients: it rejects negative-going glitches shorter than ~0.1µs and tolerates longer transients depending on overdrive magnitude (e.g., up to ~100µs for 100mV overdrive). This immunity is confirmed in the "Maximum Transient Duration vs. VCC Reset Threshold Overdrives" graph in the datasheet.
What package type and RoHS status does MAX6309UK42D3+ use?
MAX6309UK42D3+ uses a 5-pin SOT23 package (outline U5+1, land pattern 90-0174) and is supplied in lead-free, RoHS-compliant packaging - indicated by the "+" suffix in the part number. It is shipped in tape-and-reel format only, with a standard order increment of 2,500 pieces for this standard version.
MAX6309UK42D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.2V, Adj
- Output:
- Push-Pull, Totem Pole
- 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
MAX6309UK42D3+ FAQ
1.How can I place an order for MAX6309UK42D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6309UK42D3+ 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 MAX6309UK42D3+ reliable?
The price and inventory of MAX6309UK42D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6309UK42D3+ is usually 5 days.
3.What payment methods are accepted for MAX6309UK42D3+?
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4.How is shipping managed for MAX6309UK42D3+?
MAX6309UK42D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6309UK42D3+ 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 MAX6309UK42D3+?
For technical support, including MAX6309UK42D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6309UK42D3+ requirements.
6.How does Aetrix verify that MAX6309UK42D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6309UK42D3+ 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 MAX6309UK42D3+ meets industry standards.
7.What is the process for return or replacement of MAX6309UK42D3+?
All MAX6309UK42D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6309UK42D3+, 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 MAX6309UK42D3+ part is unused and in its original packaging.
Return procedure for MAX6309UK42D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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