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Analog Devices Inc./Maxim Integrated MAX6335US18D3+T
- Part No.:
- MAX6335US18D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6335US18D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,666
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Product details
Overview
The MAX6335US18D3+T from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit designed for 1.8V power supply monitoring in space-constrained embedded systems. It asserts RESET when VCC falls below 1.80V (±1.8% at +25°C, ±3% over -40°C to +125°C) or upon manual reset, with a guaranteed minimum 100ms timeout and valid operation down to VCC = 0.7V. Used in portable equipment and critical µP power monitoring.
For engineers reviewing the MAX6335US18D3+T datasheet, MAX6335US18D3+T pinout, MAX6335US18D3+T application, or MAX6335US18D3+T equivalent, key selection criteria include its 1.8V factory-trimmed reset threshold, 100ms minimum reset timeout, ultra-low 3.3µA supply current at 1.8V, SOT143-4 package compatibility, and active-high push/pull output structure.
Technical Context
This IC implements a precision voltage comparator with factory-trimmed 1.80V threshold and internal debounced manual-reset input (MR), eliminating external RC networks. Its reset assertion logic guarantees correct state retention down to VCC = 0.7V, and the comparator rejects fast transients via built-in immunity-maximum glitch duration without reset is ≤24µs at 10V/ms VCC fall rate.
The device features a fixed 100ms nominal reset timeout period (tRP), fully specified across -40°C to +125°C, with normalized timeout variation ≤±20% over temperature. Output drive capability is characterized for ISOURCE = 1µA (VOH ≥ 0.8VCC at VCC ≥ 1.0V) and ISINK = 500µA (VOL ≤ 0.3VCC at VCC ≥ 1.8V), supporting direct interface to high-impedance µP reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.80V ±1.8% (25°C), ±3% (-40°C to +125°C); ensures reliable brownout detection for 1.8V core supplies |
| Reset Timeout Period | 100ms minimum; guarantees sufficient hold time for µP initialization sequences |
| Supply Voltage Range | 0.7V to 5.5V; supports operation during deep brownout and battery-depleted conditions |
| Supply Current | 3.3µA typical at VCC = 1.8V, 25°C; enables multi-year battery life in portable applications |
| Output Type | Active-high push/pull RESET; eliminates need for external pull-up resistor and simplifies µP interface |
| Operating Temperature | -40°C to +125°C; qualified for automotive under-hood and industrial control environments |
| MR Input Threshold | 0.5V max (VIL), 0.8V min (VIH); compatible with 1.8V logic levels and includes 20kΩ internal pull-up |
Pinout & Package
MAX6335US18D3+T is housed in a lead-free 4-pin SOT143 package (JEDEC TO-236AB), measuring 2.9mm × 1.3mm × 1.0mm, optimized for PCB area-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for all internal circuitry; must be connected to system ground plane for stable reset threshold accuracy |
| 2 - RESET | Active-high push/pull reset output | Drives high during reset assertion (VCC < 1.80V or MR low); sinks current when deasserted; interfaces directly to µP reset pin without pull-up |
| 3 - MR | Debounced manual-reset input | Logic-low assertion triggers reset; internal 20kΩ pull-up allows floating if unused; no external debounce required |
| 4 - VCC | Power supply input | Monitored supply rail; powers internal circuitry and defines reset threshold reference; operates down to 0.7V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.80V threshold | Eliminates external resistor divider calibration and improves production yield in 1.8V system designs |
| 100ms minimum reset timeout | Meets JEDEC JESD74A requirements for µP power-on reset hold time across full temperature range |
| Ultra-low 3.3µA supply current | Reduces standby power in always-on battery-powered devices such as IoT sensors and wearables |
| Valid operation down to VCC = 0.7V | Ensures deterministic reset behavior during deep undervoltage events before system shutdown |
| SOT143-4 package compatibility | Enables drop-in replacement of MAX811/MAX812 and MAX6314/MAX6315 in existing layouts |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Battery-powered glucose monitors and pulse oximeters requiring long shelf life and reliable cold-start behavior. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output powering the MCU; asserts active-high RESET until VCC stabilizes above 1.80V post-battery insertion. Use Value: 3.3µA quiescent current extends battery life beyond 5 years; 0.7V operating limit ensures reset validity during battery voltage sag. |
Use Scenario: Under-dash control units exposed to wide ambient temperatures and load-dump transients. IC Role / Device Role / Timing Role: Supervises 1.8V domain of automotive microcontroller; provides 100ms reset hold after ignition-on and during cranking-induced brownouts. Use Value: -40°C to +125°C qualification and transient-immune comparator prevent spurious resets during engine start. |
| Industrial PLC I/O Modules | Smart Energy Meters |
|
Use Scenario: DIN-rail mounted programmable logic controllers with isolated 1.8V logic rails. IC Role / Device Role / Timing Role: Resets FPGA configuration controller on 1.8V supply; debounced MR supports field-service reset via front-panel button. Use Value: Internal MR pull-up and hardware debounce remove need for external switch filtering components, reducing BOM count. |
Use Scenario: Revenue-grade electricity meters with tamper-detection circuitry and real-time clock backup. IC Role / Device Role / Timing Role: Ensures clean MCU reset during AC mains dropout or supercapacitor backup transitions. Use Value: 1.80V threshold precisely matches low-voltage auxiliary supply; 100ms timeout accommodates RTC capacitor recharge delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6336US18D3+T | Identical 1.80V threshold and 100ms timeout, but features active-low push/pull RESET output | Requires inverted reset logic handling in µP firmware or external inverter; incompatible with µPs expecting active-high reset | Select only if target µP requires active-low reset assertion and board layout permits output polarity change |
| MAX6315US18D3+T | Same 1.80V threshold and SOT143 package, but offers 1.6V minimum VCC operation and no MR input | Lacks manual reset functionality; unsuitable for systems requiring field-service or test-mode reset capability | Choose when manual reset is unnecessary and lowest possible supply voltage (1.6V) is critical for ultra-low-power sleep modes |
Compared with MAX6336US18D3+T and MAX6315US18D3+T, the MAX6335US18D3+T uniquely delivers active-high reset assertion with manual reset support and guaranteed 0.7V operation-making it optimal for 1.8V µP systems needing deterministic startup and serviceability without firmware inversion or external components.
Availability
MAX6335US18D3+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6335US18D3+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX6335 series belongs to Maxim's µP supervisory product line, engineered specifically for ultra-low-voltage, low-power reset supervision in battery-operated and thermally demanding embedded systems.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6335US18D3+T?
The MAX6335US18D3+T has a factory-trimmed reset threshold of 1.80V, with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating range. This value is laser-trimmed during production and documented in Table 1 of the MAX6335/MAX6336/MAX6337 datasheet. The MAX6335US18D3+T uses this precise threshold to supervise 1.8V power rails without external calibration.
Does MAX6335US18D3+T support manual reset, and how is it implemented?
Yes, MAX6335US18D3+T includes a debounced manual-reset input (MR) on Pin 3. A logic-low signal on MR asserts the active-high RESET output, and reset remains asserted for the full 100ms timeout after MR returns high. An internal 20kΩ pull-up resistor allows MR to be left unconnected if unused. No external debounce circuitry is required-the MAX6335US18D3+T handles filtering internally.
What is the minimum supply voltage at which MAX6335US18D3+T guarantees correct reset output state?
The MAX6335US18D3+T guarantees correct RESET output state down to VCC = 0.7V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during deep brownout conditions where other supervisors may fail. The MAX6335US18D3+T maintains valid push/pull drive capability even at this ultra-low voltage, unlike open-drain alternatives.
Is MAX6335US18D3+T pin-compatible with older Maxim reset ICs?
Yes, MAX6335US18D3+T is pin-compatible with MAX811/MAX812 and MAX6314/MAX6315 in the SOT143-4 package. Pin 1 (GND), Pin 2 (RESET), Pin 3 (MR), and Pin 4 (VCC) match identically. However, note that output polarity differs: MAX6335US18D3+T provides active-high RESET, whereas MAX811/MAX812 are active-low-firmware or schematic review is required before substitution.
What is the supply current consumption of MAX6335US18D3+T at 1.8V and room temperature?
The MAX6335US18D3+T draws 3.3µA typical supply current at VCC = 1.8V and TA = +25°C, with a maximum of 6.0µA over temperature. This ultra-low quiescent current is measured with RESET not asserted and MR unconnected. The low ICC enables multi-year operation in coin-cell–powered applications, making the MAX6335US18D3+T ideal for energy-harvesting and portable sensor nodes.
MAX6335US18D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6335US18D3+T FAQ
1.How can I place an order for MAX6335US18D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6335US18D3+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 MAX6335US18D3+T reliable?
The price and inventory of MAX6335US18D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6335US18D3+T is usually 5 days.
3.What payment methods are accepted for MAX6335US18D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6335US18D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6335US18D3+T?
MAX6335US18D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6335US18D3+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 MAX6335US18D3+T?
For technical support, including MAX6335US18D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6335US18D3+T requirements.
6.How does Aetrix verify that MAX6335US18D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6335US18D3+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 MAX6335US18D3+T meets industry standards.
7.What is the process for return or replacement of MAX6335US18D3+T?
All MAX6335US18D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6335US18D3+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 MAX6335US18D3+T part is unused and in its original packaging.
Return procedure for MAX6335US18D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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