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onsemi MAX809SN232T1
- Part No.:
- MAX809SN232T1
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809SN232T1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,570
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Product details
Overview
MAX809SN232T1 from onsemi is a precision 2.32 V active-low microprocessor reset supervisor IC in SOT-23-3 package, featuring 140–460 ms factory-trimmed reset timeout, <0.5 µA supply current at 3.3 V, and guaranteed RESET output validity down to VCC = 1.0 V. It monitors VCC in battery-powered embedded systems and asserts reset during brownout or power-up sequencing.
For engineers reviewing the MAX809SN232T1 datasheet, pinout, applications, or equivalent options, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +105°C), transient immunity (rejects ≤5 µs/100 mV glitches), VCC operating range (1.2 V to 5.5 V), and compatibility with hot-swap and low-power MCU interfaces.
Technical Context
The MAX809SN232T1 implements a precision bandgap-based voltage detector with 30 ppm/°C temperature coefficient and an internal oscillator-driven digital timeout counter. Its active-low RESET output remains asserted for ≥140 ms after VCC rises above 2.32 V, with maximum delay of 460 ms across temperature.
Designed for glitch immunity, it rejects fast negative transients on VCC - e.g., 100 mV overdrive lasting ≤5 µs does not trigger reset. The device operates from 1.2 V to 5.5 V and maintains valid logic levels (VOL ≤ 0.3 V, VOH ≥ 0.8×VCC) across its full industrial temperature range (−40°C to +105°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32 V ±2.5% (min/max 2.25 V / 2.38 V at +25°C); ensures reliable detection of 2.5 V rail sag before system instability |
| Reset Timeout | 140–460 ms (factory-trimmed); guarantees sufficient hold time for full microprocessor initialization and memory stabilization |
| Supply Current | 0.5 µA typical at VCC = 3.3 V; enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| VCC Operating Range | 1.2 V to 5.5 V; supports direct interface with 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level shifting |
| RESET Output Validity | Valid down to VCC = 1.0 V; prevents floating reset state during deep brownout, avoiding undefined MCU behavior |
| Temperature Range | −40°C to +105°C; qualified for industrial control, automotive cabin electronics, and outdoor edge devices |
| Transient Immunity | Rejects ≤5 µs, 100 mV negative glitches on VCC; eliminates false resets from switching noise or ESD coupling |
Pinout & Package
SOT-23-3 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, Pb-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal voltage reference and comparator; must be connected to system ground plane with low-inductance path |
| 2 | RESET (active-low) | Open-drain or push-pull output (per variant); sinks current when asserted low; drives standard CMOS inputs directly |
| 3 | VCC | Power supply input; also monitored rail; decoupling capacitor (0.1 µF ceramic) required within 2 mm for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.32 V threshold | Guaranteed ±2.5% tolerance over −40°C to +105°C enables accurate monitoring of 2.5 V supplies without external calibration |
| Ultra-low 0.5 µA ICC | Reduces standby power by >90% vs. legacy supervisors; extends battery life in always-on sensor nodes and remote controls |
| Factory-trimmed 140–460 ms timeout | Eliminates need for external RC timing components; ensures consistent reset duration across production lots and temperatures |
| VCC = 1.0 V RESET validity | Prevents indeterminate logic states during deep undervoltage; avoids MCU lockup or corrupted register writes during shutdown |
| Glitch rejection up to 100 mV/5 µs | Suppresses noise from DC-DC converters, motor drivers, or RF circuits without requiring additional filtering components |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless temperature sensor powered by CR2032 coin cell wakes periodically to sample and transmit data. IC Role / Device Role / Timing Role: MAX809SN232T1 monitors the 2.5 V LDO output and asserts active-low RESET if voltage sags below 2.32 V during RF transmission surge. Use Value: Prevents firmware crash during transient load-induced brownout; 0.5 µA quiescent current adds <0.1% annual drain to battery capacity. |
Use Scenario: An industrial analog input module operates in harsh factory environments with noisy 24 V DC supply rails. IC Role / Device Role / Timing Role: MAX809SN232T1 supervises the 3.3 V digital core rail, asserting reset for ≥140 ms after power-up to ensure FPGA configuration completes before peripheral initialization. Use Value: Factory-trimmed timeout eliminates timing uncertainty; −40°C to +105°C rating ensures reliability in uncooled control cabinets. |
| Medical Wearable Monitor | Automotive Infotainment Subsystem |
Use Scenario: A wrist-worn ECG monitor uses a low-noise 1.8 V analog front-end powered from a buck converter. IC Role / Device Role / Timing Role: MAX809SN232T1 detects undervoltage on the 1.8 V rail and holds MCU in reset until stable, preventing corrupted ADC sampling during startup. Use Value: Valid RESET down to VCC = 1.0 V ensures deterministic behavior even during rapid battery depletion; RoHS/Pb-free compliance meets medical regulatory requirements. |
Use Scenario: A head-unit display processor receives switched 5 V from vehicle ignition, subject to load-dump transients and cold-crank dips. IC Role / Device Role / Timing Role: MAX809SN232T1 monitors the post-LDO 3.3 V domain and provides glitch-immune reset assertion during engine cranking (≤1.2 V dips). Use Value: Rejects 100 mV/5 µs transients common in automotive electrical systems; eliminates spurious reboots without adding TVS diodes or RC filters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809SQ232T1G | Identical 2.32 V threshold and 140–460 ms timeout, but in SC-70-3 package (smaller footprint, different thermal resistance) | Preferred where board space is constrained and thermal dissipation requirements differ (RJA = 314°C/W vs. 301°C/W for SOT-23) | Select MAX809SQ232T1G only if SC-70 placement and reflow profile are validated; not drop-in compatible due to different pin pitch and marking. |
| TPS3808G125DBVR | 2.5 V threshold (not 2.32 V); adjustable timeout via external capacitor; 1.8 µA ICC at 3.3 V; supports watchdog functionality | Used when programmable timeout or watchdog capability is required; unsuitable for fixed 2.32 V threshold applications | Choose TPS3808G125DBVR only if system design requires timeout flexibility or dual reset/watchdog functionality; threshold mismatch invalidates direct substitution. |
Compared with MAX809SQ232T1G, the MAX809SN232T1 offers identical electrical performance in a more thermally robust SOT-23 package; versus TPS3808G125DBVR, it delivers lower quiescent current and fixed timing but lacks adjustability and watchdog features - making it optimal for cost-sensitive, space-constrained, and ultra-low-power reset-only use cases.
Availability
MAX809SN232T1 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC modules, and medical wearable monitors requiring stable component supply and long-term lifecycle support.
Supply support for MAX809SN232T1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The MAX809 series belongs to onsemi's system supervision product line, designed specifically for reliable, low-power, single-rail voltage monitoring and reset generation in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX809SN232T1?
The MAX809SN232T1 has a nominal reset threshold of 2.32 V, with guaranteed min/max values of 2.25 V and 2.38 V at +25°C, and ±2.5% tolerance maintained over −40°C to +105°C. This precise threshold ensures accurate detection of 2.5 V supply sags without false triggering or missed events. The MAX809SN232T1 is specified for use in systems where stable 2.32 V monitoring is critical to prevent premature or delayed reset assertion.
Does the MAX809SN232T1 support active-high reset output?
No - the MAX809SN232T1 provides an active-low RESET output only, consistent with the MAX809 family designation. For active-high reset, engineers must select a MAX810-series part (e.g., MAX810SN232T1G). The MAX809SN232T1's RESET pin is driven low during reset assertion and returns high when VCC exceeds the threshold and timeout expires. Using MAX809SN232T1 in an active-high reset system requires external inversion, which is not recommended due to added complexity and timing uncertainty.
What is the minimum VCC voltage at which the MAX809SN232T1 guarantees valid RESET output?
The MAX809SN232T1 guarantees valid RESET output down to VCC = 1.0 V, meaning VOL ≤ 0.3 V and VOH ≥ 0.8×VCC remain within specification until VCC drops to 1.0 V. Below this, the output enters high-impedance state. This ensures deterministic reset behavior during brownout conditions in battery-powered systems. The MAX809SN232T1's 1.0 V validity limit is critical for applications like wearables where battery voltage decays gradually and MCU reset integrity must be preserved until final shutdown.
Can the MAX809SN232T1 replace the MAX809SN293D2T1G in a design?
No - the MAX809SN232T1 and MAX809SN293D2T1G have different reset thresholds (2.32 V vs. 2.93 V) and timeout ranges (140–460 ms vs. 20–66 ms), making them functionally incompatible without circuit redesign. Substituting MAX809SN232T1 for MAX809SN293D2T1G would cause premature reset assertion on 3.3 V rails and extend reset duration beyond system timing budgets. The MAX809SN232T1 is intended for 2.5 V domain supervision, not 3.3 V; verification against actual VCC profile and timing requirements is mandatory before any interchange.
Is the MAX809SN232T1 RoHS compliant and Pb-free?
Yes - the MAX809SN232T1 is manufactured in a Pb-free process and fully RoHS compliant, as confirmed in the official onsemi datasheet (Publication Order Number MAX809S/D, Rev. 30, June 2024). The "G" suffix in the full orderable part number (MAX809SN232T1G) explicitly denotes Pb-free packaging. This compliance ensures suitability for consumer, medical, and industrial markets with strict environmental regulations. The MAX809SN232T1 meets JEDEC J-STD-020 moisture sensitivity level 1 and supports standard SnPb and lead-free reflow profiles.
MAX809SN232T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MAX809SN232T1 FAQ
1.How can I place an order for MAX809SN232T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809SN232T1 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 MAX809SN232T1 reliable?
The price and inventory of MAX809SN232T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809SN232T1 is usually 5 days.
3.What payment methods are accepted for MAX809SN232T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809SN232T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809SN232T1?
MAX809SN232T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809SN232T1 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 MAX809SN232T1?
For technical support, including MAX809SN232T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809SN232T1 requirements.
6.How does Aetrix verify that MAX809SN232T1 is sourced from the original manufacturer or authorized distributors?
All MAX809SN232T1 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 MAX809SN232T1 meets industry standards.
7.What is the process for return or replacement of MAX809SN232T1?
All MAX809SN232T1 units undergo pre-shipment inspection (PSI). If there is an issue with MAX809SN232T1, 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 MAX809SN232T1 part is unused and in its original packaging.
Return procedure for MAX809SN232T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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