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Analog Devices Inc./Maxim Integrated MAX6309EUK29D3+T
- Part No.:
- MAX6309EUK29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6309EUK29D3+T.pdf
- Description:
- IC SUPERVISOR 2.9300V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,570
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Product details
Overview
MAX6309EUK29D3+T from Maxim Integrated is a precision programmable supervisory IC that monitors VCC and an external undervoltage input (RST IN), asserts active-low push/pull RESET during out-of-tolerance conditions, features factory-set 2.93V VCC reset threshold (±2.5% over -40°C to +85°C), 140ms min reset timeout, and operates down to VCC = 1.0V - used in multivoltage embedded controllers for reliable power-up/brownout recovery.
For engineers reviewing the MAX6309EUK29D3+T datasheet, MAX6309EUK29D3+T pinout, MAX6309EUK29D3+T application, or MAX6309EUK29D3+T equivalent, this page delivers verified electrical specs, SOT23-5 terminal mapping, real-world use cases in battery-powered instrumentation and industrial controllers, and two validated alternative parts with documented functional trade-offs.
Technical Context
The MAX6309EUK29D3+T integrates a factory-trimmed voltage divider for precise 2.93V VCC monitoring, a dedicated RST IN comparator referenced to 1.23V internal bandgap, and a manual-reset (MR) input with 63.5kΩ internal pull-up. Its push/pull RESET output sources/sinks current (VOH = 0.8×VCC, VOL = 0.3V at ISINK = 1.2mA), enabling direct interface with microcontroller reset pins without external pull-ups.
It implements a temperature-stable reset timeout generator (±0.5% variation over -40°C to +85°C), guarantees RESET validity down to VCC = 1.0V, and rejects transients ≤140ns at 2.93V overdrive - critical for noisy 3.3V/5V mixed-rail systems where fast supply glitches must not trigger spurious resets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V ±2.5% (–40°C to +85°C); ensures reliable detection of 3.3V rail brownout before µP malfunction |
| Reset Timeout Period | 140ms minimum; provides sufficient hold time for 3.3V µP initialization after power stabilization |
| Supply Current | 8µA typical at +25°C; enables >10-year battery life in portable instrumentation |
| RESET Output Type | Active-low push/pull; eliminates need for external pull-up resistor and supports bidirectional µP reset I/O |
| Operating Temperature | –40°C to +85°C; qualified for industrial control and automotive under-hood auxiliary modules |
| MR Input Logic | TTL/CMOS-compatible with 0.3×VCC VIH threshold; allows direct connection to 3.3V or 5V logic without level shifters |
| VCC Range | 1.0V to 5.5V; maintains valid RESET assertion even during deep brownout, preventing undefined µP state |
Pinout & Package
MAX6309EUK29D3+T is housed in a RoHS-compliant, lead-free 5-pin SOT23 package (outline U5+1, footprint 90-0174), optimized for space-constrained PCB layouts in portable and embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives µP reset pin directly; sinks 1.2mA / sources 500µA; valid down to VCC = 1.0V |
| 2 - GND | System ground reference | Return path for all internal comparators and RESET driver; must be low-impedance |
| 3 - RST IN | Adjustable undervoltage reset input | Compares external voltage to 1.23V reference; enables monitoring of secondary rail (e.g., 1.8V core) |
| 4 - MR | Manual reset input | Pull-to-GND initiates reset; internal 63.5kΩ pull-up allows NC or VCC tie; 1.5µs min pulse width |
| 5 - VCC | Main supply and primary monitored rail | Powered from 3.3V system rail; internally divided to set 2.93V reset threshold; also powers all circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed VCC threshold | 2.93V with ±2.5% tolerance over full temperature range - eliminates external resistor calibration |
| Immunity to VCC transients | Rejects negative-going glitches ≤140ns at 2.93V overdrive - prevents false resets in electrically noisy environments |
| No external components required | Operates standalone with only VCC, GND, and optional RST IN divider - reduces BOM count and layout area |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic µP reset assertion during deep brownout - avoids undefined startup states |
| Manual reset with internal pull-up | 63.5kΩ internal MR pull-up enables momentary switch interface without external resistors or debounce |
Applications
| Industrial PLC I/O Module | Battery-Powered Data Logger |
|---|---|
Use Scenario: 3.3V microcontroller and analog front-end powered from switched-mode supply with ripple and load-step transients. IC Role / Device Role / Timing Role: Primary VCC supervisor for 3.3V rail and secondary monitor for 1.8V ADC supply via RST IN. Use Value: Prevents firmware corruption during 3.3V rail dips below 2.93V; 140ms timeout ensures stable clock lock before µP execution. |
Use Scenario: Long-life sensor node using coin-cell battery, requiring ultra-low quiescent current and robust cold-start behavior. IC Role / Device Role / Timing Role: Power-on reset generator and brownout detector for MSP430-based controller. Use Value: 8µA supply current extends battery life; guaranteed RESET down to VCC = 1.0V ensures safe reset even as battery depletes to 1.1V. |
| Medical Point-of-Care Monitor | Automotive Body Control Module |
Use Scenario: Dual-rail system with 5V main logic and isolated 3.3V communication interface, subject to ESD and load dump coupling. IC Role / Device Role / Timing Role: VCC supervisor for 3.3V domain and manual reset initiator via front-panel button. Use Value: MR input with internal pull-up simplifies button interface; transient immunity prevents false resets during ESD events on adjacent traces. |
Use Scenario: 12V-to-3.3V converted supply powering CAN controller and LIN transceivers in harsh automotive environment. IC Role / Device Role / Timing Role: Primary reset supervisor for 3.3V domain, with RST IN monitoring 5V auxiliary rail. Use Value: –40°C to +85°C qualification ensures operation across engine bay temperature extremes; 2.93V threshold matches 3.3V rail tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V threshold (±0.5%), 200ms timeout, 1.4µA IQ, SOT23-6 | Lacks RST IN input and MR; suited for single-rail 3.3V systems only | Select when only VCC monitoring is needed and ultra-low IQ is critical; requires PCB redesign due to 6-pin package |
| ADM6315-29ARTZ-RL | 2.93V threshold (±2.0%), 140ms timeout, 12µA IQ, SOT23-5, open-drain RESET | Open-drain output requires external pull-up; no RST IN or MR inputs | Choose for cost-sensitive designs where push/pull drive is unnecessary and manual reset is handled externally |
Compared with MAX6309EUK29D3+T, TPS3808G33DBVR offers lower supply current but omits dual-input supervision and manual reset, while ADM6315-29ARTZ-RL matches threshold and timeout but lacks active drive capability and auxiliary inputs - making MAX6309EUK29D3+T the only option supporting full-feature 3.3V system supervision in SOT23-5.
Availability
MAX6309EUK29D3+T is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered data loggers, medical point-of-care monitors, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6309EUK29D3+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 high-performance analog and mixed-signal ICs for demanding applications in industrial, automotive, and communications markets.
MAX6309EUK29D3+T belongs to the MAX6305–MAX6313 family of programmable supervisory circuits, engineered specifically for multivoltage microprocessor systems requiring precise, glitch-immune reset generation with minimal external components.
FAQ
What is the exact factory-set VCC reset threshold for MAX6309EUK29D3+T?
The MAX6309EUK29D3+T has a factory-trimmed VCC reset threshold of 2.93V, with ±2.5% tolerance over the full operating temperature range of –40°C to +85°C. This value is confirmed in Table 1 of the datasheet and corresponds to the "29" suffix in the part number. The threshold is implemented via an internal precision voltage divider and does not require external calibration.
Does MAX6309EUK29D3+T support monitoring a second voltage rail?
Yes, MAX6309EUK29D3+T supports monitoring a second voltage rail via its RST IN pin, which compares an external voltage to a 1.23V internal reference. By connecting a resistor divider from the secondary rail (e.g., 1.8V or 5V) to RST IN, users can configure undervoltage detection independent of the primary VCC (3.3V) monitoring - a key feature distinguishing it from single-input supervisors.
What is the function of the MR pin on MAX6309EUK29D3+T?
The MR (Manual Reset) pin on MAX6309EUK29D3+T is an active-low input that forces a reset when pulled to GND. It features an internal 63.5kΩ pull-up resistor, allowing direct connection to a momentary switch without external components. Reset remains asserted for the full 140ms timeout period after MR returns high, ensuring reliable µP initialization regardless of switch bounce.
Can MAX6309EUK29D3+T operate with VCC below 2.5V?
Yes, MAX6309EUK29D3+T guarantees valid RESET assertion down to VCC = 1.0V, as specified in the Electrical Characteristics table. Unlike some supervisors that disable below 2.5V, this device maintains functional reset generation during deep brownout - critical for preventing undefined microcontroller states in battery-depleted or faulted systems.
What package type and RoHS status does MAX6309EUK29D3+T use?
MAX6309EUK29D3+T is supplied in a lead-free, RoHS-compliant 5-pin SOT23 package (package code U5+1). The "+T" suffix explicitly denotes lead-free termination per JEDEC J-STD-020, with reflow profile compatible up to +260°C. Footprint and land pattern information is available from Maxim's official package database under outline number 21-0057.
MAX6309EUK29D3+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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6309EUK29D3+T FAQ
1.How can I place an order for MAX6309EUK29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6309EUK29D3+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 MAX6309EUK29D3+T reliable?
The price and inventory of MAX6309EUK29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6309EUK29D3+T is usually 5 days.
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Once your MAX6309EUK29D3+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 MAX6309EUK29D3+T?
For technical support, including MAX6309EUK29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6309EUK29D3+T requirements.
6.How does Aetrix verify that MAX6309EUK29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6309EUK29D3+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 MAX6309EUK29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6309EUK29D3+T?
All MAX6309EUK29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6309EUK29D3+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 MAX6309EUK29D3+T part is unused and in its original packaging.
Return procedure for MAX6309EUK29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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