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Analog Devices Inc./Maxim Integrated MAX6309UK25D3-T
- Part No.:
- MAX6309UK25D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6309UK25D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,898
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Product details
Overview
MAX6309UK25D3-T from Maxim Integrated is a 5-pin SOT23 programmable supervisory IC that monitors VCC and an external undervoltage input (RST IN), asserts active-low push/pull RESET when either falls below its threshold, and provides manual reset capability. It features factory-set 2.5V VCC reset threshold (±2.5% over temperature), 140ms minimum 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 engineers reviewing the MAX6309UK25D3-T datasheet, MAX6309UK25D3-T pinout, MAX6309UK25D3-T application, or MAX6309UK25D3-T equivalent, key selection criteria include its dual-supply monitoring capability (VCC + RST IN), push/pull output drive strength, factory-programmed 2.5V/140ms configuration, immunity to fast transients, and operation across 0°C to +70°C.
Technical Context
The MAX6309UK25D3-T implements a precision bandgap reference (1.23V) to compare VCC against a factory-trimmed internal voltage divider and RST IN against the same reference via external resistor network. Its reset generator includes a temperature-stable RC timer for the 140ms (min) timeout period, with propagation delay under 500ns from MR assertion to RESET activation.
This device belongs to the MAX6305–MAX6313 family of multiple-input supervisory circuits; unlike MAX6305/MAX6308/MAX6311, it monitors VCC directly and adds one adjustable RST IN input plus MR. Its push/pull RESET output sources up to 800µA at VCC > 4.25V and sinks 3.2mA - enabling direct interface with µP reset pins without external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.5V nominal, ±2.5% over -0°C to +70°C - sets precise brownout detection point for main system rail |
| Reset Timeout Period | 140ms minimum - ensures µP remains held in reset long enough for stable clock and supply settling |
| Supply Current | 8µA typical at +25°C - enables use in battery-backed or ultra-low-power portable systems |
| RESET Output Type | Active-low push/pull - eliminates need for external pull-up resistor and supports bidirectional µP reset I/O |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial and computing applications |
| MR Input Logic | TTL/CMOS-compatible with 63.5kΩ internal pull-up - allows momentary switch or logic-level reset initiation without external components |
| RST IN Threshold Reference | 1.23V ±0.03V - enables accurate external undervoltage monitoring of auxiliary rails (e.g., 3.3V, 1.8V) using resistor dividers |
Pinout & Package
MAX6309UK25D3-T is housed in a 5-pin SOT23 package (outline U5+1, land pattern 90-0174), measuring 2.9mm × 1.6mm × 1.1mm, suitable for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives µP reset pin directly; sinks 3.2mA / sources 800µA; valid down to VCC = 1V |
| 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 | Active-low; internally pulled up to VCC; forces reset for ≥1.5µs pulse width; immune to <0.1µs glitches |
| 5 - VCC | Main supply input and monitored rail | Supplies IC and feeds internal trimmed divider for 2.5V reset detection; operating range 2.75V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail supervision | Simultaneously monitors primary VCC (2.5V) and secondary rail via RST IN - supports 3V/5V or mixed-voltage systems |
| Transient immunity | Rejects VCC transients <140µs at 2.5V overdrive - prevents false resets during switching noise or load dumps |
| No external timing components | Factory-programmed 140ms timeout uses on-chip RC - eliminates capacitor tolerance drift and board space |
| Guaranteed reset assertion | RESET remains valid to VCC = 1V - ensures deterministic behavior during deep brownout before power collapse |
| Integrated MR pull-up | 63.5kΩ internal resistor - enables single-pole momentary switch interface without discrete BOM addition |
Applications
| Industrial PLC Controller | Medical Point-of-Care Device |
|---|---|
|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted controllers with 24V DC input and internal 5V/3.3V regulation. IC Role / Device Role / Timing Role: Supervises both 5V logic rail and 3.3V microcontroller core rail; asserts RESET if either sags during motor startup or EMI event. Use Value: Prevents firmware lockup by guaranteeing 140ms reset hold time after VCC recovery, while RST IN monitors isolated 3.3V domain independently. |
Use Scenario: Battery-powered handheld diagnostic instrument with dual Li-ion cells (6.4–8.4V) and buck-boost regulators generating 5V and 3.3V. IC Role / Device Role / Timing Role: Monitors main 5V supply and 3.3V analog front-end rail; MR pin enables clinician-initiated recalibration reset. Use Value: 8µA quiescent current extends battery life; push/pull RESET drives low-capacitance µP reset pin directly, eliminating leakage-sensitive pull-up resistors. |
| Automotive Infotainment Head Unit | Network Edge Router |
|
Use Scenario: 12V automotive system with wide-input DC/DC converters delivering 5V MCU rail and 3.3V communication interface rail. IC Role / Device Role / Timing Role: Detects cold-crank brownout on 5V rail and monitors 3.3V CAN transceiver supply via RST IN; MR supports service-mode reset. Use Value: Immunity to <200ns transients prevents spurious resets during load dump; guaranteed operation to +70°C meets under-dash thermal requirements. |
Use Scenario: AC-powered enterprise router with redundant 5V supplies and separate 3.3V PHY management rail. IC Role / Device Role / Timing Role: Supervises primary 5V CPU rail and secondary 3.3V Ethernet PHY rail; MR tied to FPGA-configurable GPIO for remote reset. Use Value: Factory-set 2.5V threshold matches 5V rail's 50% dropout point; 140ms timeout exceeds PCIe reset specification (100ms min). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6309UK29D3-T | Factory-set VCC threshold = 2.9V (±2.5%), otherwise identical pinout, timing, and features | Suitable where system brownout margin requires higher trip point (e.g., 3.3V rail with 10% tolerance) | Select when 2.9V VCC detection better matches target supply's regulation window than 2.5V |
| TPS3808G125DBVR | 2.5V fixed threshold, 200ms timeout, open-drain output, 1.4µA IQ, SOT23-5 - no RST IN or MR inputs | Limited to single-rail monitoring; requires external pull-up; lower IQ but less flexible supervision | Choose only if dual-input supervision and manual reset are unnecessary and ultra-low IQ is critical |
Compared with MAX6309UK25D3-T, MAX6309UK29D3-T offers a higher VCC trip point for tighter brownout control, while TPS3808G125DBVR reduces supply current by 82% but sacrifices RST IN monitoring and MR functionality - making it suitable only for simpler single-rail applications.
Availability
MAX6309UK25D3-T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical point-of-care devices, and automotive infotainment head units requiring stable component supply across commercial temperature range and long-term production continuity.
Supply support for MAX6309UK25D3-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 and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and integration for demanding environments.
The MAX6305–MAX6313 family was developed to provide compact, multi-rail power supervision for space-constrained embedded systems - combining factory-programmable thresholds, integrated timing, and flexible input configurations in SOT23 packaging.
FAQ
What is the exact factory-set VCC reset threshold for MAX6309UK25D3-T?
The MAX6309UK25D3-T has a factory-trimmed nominal VCC reset threshold of 2.5V, with tolerance of ±2.5% over the full operating temperature range of 0°C to +70°C. This value is laser-trimmed during production and specified in the Electrical Characteristics table under "Reset Threshold (VTH)" for MAX6309 variants. The "25" in the part number explicitly denotes the 2.5V threshold option per Maxim's ordering convention.
Does MAX6309UK25D3-T support monitoring of a second voltage rail besides VCC?
Yes, MAX6309UK25D3-T supports monitoring of a second voltage rail via its RST IN pin, which compares an externally divided voltage to an internal 1.23V reference. By connecting a resistor divider from the auxiliary rail (e.g., 3.3V or 1.8V) to RST IN and GND, the device asserts RESET if that rail falls below the programmed threshold - enabling true dual-rail supervision without additional ICs.
What is the function of the MR pin on MAX6309UK25D3-T and how is it used?
The MR (Manual Reset) pin on MAX6309UK25D3-T is an active-low input that forces RESET assertion when pulled below 0.3×VCC. It features a 63.5kΩ internal pull-up resistor, allowing direct connection to a normally-open momentary switch to GND. RESET remains active for the full 140ms timeout after MR returns high, ensuring reliable µP reset initiation independent of power conditions.
Is MAX6309UK25D3-T compatible with 3.3V-only systems?
Yes, MAX6309UK25D3-T operates with VCC as low as 2.75V (VTH + 2.5%) and guarantees RESET validity down to VCC = 1V, making it fully compatible with 3.3V systems. Its RST IN input accepts voltages up to VCC – 0.3V, and the 1.23V reference enables accurate monitoring of 3.3V rails using standard resistor dividers - confirmed in the Adjustable Reset Inputs section of the datasheet.
What package type and RoHS status does MAX6309UK25D3-T use?
MAX6309UK25D3-T is supplied in a 5-pin SOT23 package (package code U5+1, outline 21-0057) with lead-free termination. The "-T" suffix indicates tape-and-reel packaging with RoHS-compliant, lead-free finish - verified in the Ordering Information and Package Information sections of the datasheet, and aligned with Maxim's standard lead-free qualification for this family.
MAX6309UK25D3-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.5V, 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
MAX6309UK25D3-T FAQ
1.How can I place an order for MAX6309UK25D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6309UK25D3-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 MAX6309UK25D3-T reliable?
The price and inventory of MAX6309UK25D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6309UK25D3-T is usually 5 days.
3.What payment methods are accepted for MAX6309UK25D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6309UK25D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6309UK25D3-T?
MAX6309UK25D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6309UK25D3-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 MAX6309UK25D3-T?
For technical support, including MAX6309UK25D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6309UK25D3-T requirements.
6.How does Aetrix verify that MAX6309UK25D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6309UK25D3-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 MAX6309UK25D3-T meets industry standards.
7.What is the process for return or replacement of MAX6309UK25D3-T?
All MAX6309UK25D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6309UK25D3-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 MAX6309UK25D3-T part is unused and in its original packaging.
Return procedure for MAX6309UK25D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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