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Analog Devices Inc./Maxim Integrated DS1812-10/T&R
- Part No.:
- DS1812-10/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
DS1812-10/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,237
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Product details
Overview
DS1812-10/T&R from Maxim Integrated is a precision voltage-monitoring supervisor IC with active-high push-pull reset output, 4.35 V typical VCC trip point (±10% tolerance), 150 ms reset pulse width, and operation from -40°C to +85°C - used for reliable microprocessor power-up sequencing in embedded control systems.
For engineers reviewing the DS1812-10/T&R datasheet, DS1812-10/T&R pinout, DS1812-10/T&R application, or DS1812-10/T&R equivalent, key selection factors include trip voltage accuracy, guaranteed reset assertion time after power failure, push-pull drive capability, SOT-23 package compatibility, and temperature-compensated reference stability across industrial supply rails.
Technical Context
The DS1812-10/T&R integrates a precision temperature-compensated voltage reference and comparator to continuously monitor VCC against a fixed threshold. It asserts RST immediately upon detecting an out-of-tolerance condition and holds it active for ≥100 ms (typ. 150 ms) after VCC returns to specification.
Its CMOS push-pull output drives logic-level loads directly without external pull-up resistors. The device operates over 1.2 V to 5.5 V supply range and draws only 30–40 µA quiescent current, enabling use in low-power battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.25 V (min), 4.35 V (typ), 4.49 V (max) - defines precise 5 V system brown-out detection threshold |
| Reset Pulse Width | 100–300 ms (typ. 150 ms) - ensures sufficient stabilization time for microprocessor and power supply |
| Output Type | Push-pull active-high - eliminates need for external pull-up resistor and supports direct TTL/CMOS interface |
| Supply Current | 30–40 µA - enables long-term operation in always-on monitoring circuits |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded applications |
| Output Drive | VOH = VCC–0.1 V @ 0–500 µA; IOL = +10 mA - robust logic-level sourcing/sinking capability |
Pinout & Package
SOT-23-3 surface-mount package (3.0 mm × 1.7 mm × 1.3 mm); TO-92 also available but DS1812-10/T&R specifically denotes tape-and-reel SOT-23 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-high reset output | CMOS push-pull driver capable of sourcing up to 500 µA and sinking 10 mA - directly interfaces microcontroller reset input |
| 2 (VCC) | Power supply input | Accepts 1.2 V to 5.5 V; internal reference and comparator operate across full range |
| 3 (GND) | Ground reference | Common return path for internal circuitry and output stage; must be low-impedance for accurate trip-point stability |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage sensing | Temperature-compensated reference ensures ±1.5% trip accuracy over -40°C to +85°C - critical for stable reset timing across thermal environments |
| Guaranteed reset hold time | 100–300 ms minimum active-reset duration prevents premature processor release during marginal power recovery |
| No external components required | Self-contained supervision function eliminates discrete comparators, resistors, and capacitors - reduces BOM count and board area |
| Low quiescent current | 30–40 µA typical ICC allows integration into battery-powered or energy-harvesting systems without significant drain |
Applications
| Industrial PLC Controller | Smart Meter Power Monitoring |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller subjected to fluctuating 5 V rail due to relay switching and motor load transients. IC Role / Device Role / Timing Role: Voltage supervisor ensuring deterministic reset assertion on brown-out and guaranteed 150 ms hold time post-recovery. Use Value: Prevents firmware corruption and state machine lockup by enforcing clean restart after supply instability. | Use Scenario: Electricity meter with real-time clock and metrology ASIC operating from switched-mode 5 V supply with line-voltage sags. IC Role / Device Role / Timing Role: Primary reset generator triggered at 4.35 V threshold, holding RST active until VCC stabilizes above trip point plus 150 ms. Use Value: Maintains data integrity in nonvolatile memory and RTC registers during grid disturbances. |
| Embedded HVAC Control Board | IoT Edge Sensor Node |
Use Scenario: HVAC thermostat using low-cost 8-bit MCU powered from unregulated wall adapter with ripple and dropout risk. IC Role / Device Role / Timing Role: Single-chip power-good detector and reset timer replacing RC network and Schmitt trigger. Use Value: Eliminates manual calibration and aging drift while meeting UL 60730 Class A reset reliability requirements. | Use Scenario: Battery-operated environmental sensor node with ultra-low-power MCU entering deep sleep between readings. IC Role / Device Role / Timing Role: Always-on voltage monitor drawing only 35 µA, asserting reset if battery voltage drops below 4.25 V. Use Value: Enables graceful shutdown and flash-safe state preservation before brown-out-induced crash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G15DBVR | Fixed 1.5 V trip point; adjustable delay via external capacitor; open-drain output | Requires pull-up resistor and external timing component; suited for multi-rail or custom-delay designs | Choose when flexible reset timing or lower-voltage monitoring is needed |
| MAX6326UT29D3+ | 2.93 V trip point; 200 ms reset timeout; open-drain output; ±1.5% accuracy | Higher trip accuracy but incompatible 2.93 V threshold for 5 V systems; requires pull-up | Prefer only for 3.3 V domains where tighter tolerance justifies redesign |
Compared with TPS3808G15DBVR and MAX6326UT29D3+, the DS1812-10/T&R delivers plug-in compatibility for 5 V systems with fixed 4.35 V trip, guaranteed 150 ms reset hold, and push-pull output - reducing layout complexity and eliminating external components.
Availability
DS1812-10/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter power monitoring, and embedded HVAC control boards requiring stable component supply and long-lifecycle support.
Supply support for DS1812-10/T&R 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, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.
The DS1812-10/T&R belongs to Maxim's EconoReset™ family of voltage supervisors - engineered for cost-sensitive, high-volume embedded systems needing reliable, single-chip power monitoring without external components.
FAQ
What is the exact VCC trip voltage range for DS1812-10/T&R?
The DS1812-10/T&R has a specified VCC trip point of 4.25 V (minimum), 4.35 V (typical), and 4.49 V (maximum) - corresponding to its ±10% tolerance grade. This range is measured under recommended operating conditions (-40°C to +85°C, VCC = 1.2 V to 5.5 V) and reflects the voltage at which the internal comparator triggers reset assertion. DS1812-10/T&R maintains this accuracy across temperature via integrated temperature compensation.
Does DS1812-10/T&R require an external pull-up resistor on the RST pin?
No, DS1812-10/T&R features a push-pull active-high output that sources and sinks current internally. It can directly drive standard TTL or CMOS reset inputs without any external pull-up resistor. This eliminates one common BOM item and simplifies PCB layout - a key advantage over open-drain alternatives like the MAX6326 series. DS1812-10/T&R's VOH reaches VCC–0.1 V at 500 µA load.
What is the guaranteed minimum reset pulse width for DS1812-10/T&R?
The DS1812-10/T&R guarantees a minimum reset pulse width of 100 ms, with a typical value of 150 ms and maximum of 300 ms. This hold time begins when VCC rises above the trip threshold and ensures the microprocessor and supporting circuitry fully stabilize before release. DS1812-10/T&R meets this spec across its full operating temperature and supply voltage range.
Can DS1812-10/T&R operate from a 3.3 V supply?
Yes, DS1812-10/T&R operates from 1.2 V to 5.5 V, including 3.3 V nominal supplies. However, its 4.25–4.49 V trip point means it will assert reset continuously when powered from 3.3 V - making it unsuitable for monitoring 3.3 V rails. DS1812-10/T&R is specifically designed for 5 V systems; for 3.3 V supervision, consider DS1812-33 variants or alternative supervisors with matching thresholds.
Is DS1812-10/T&R available in both TO-92 and SOT-23 packages?
DS1812-10/T&R specifically denotes the tape-and-reel SOT-23-3 package variant. While the DS1812 family includes TO-92 versions (e.g., DS1812-10+), the "/T&R" suffix confirms this part is supplied in SOT-23 format on carrier tape. Mechanical drawings for both packages are available on the Maxim (Analog Devices) website, but DS1812-10/T&R refers exclusively to the surface-mount version.
DS1812-10/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconoReset
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.35V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
DS1812-10/T&R FAQ
1.How can I place an order for DS1812-10/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1812-10/T&R 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 DS1812-10/T&R reliable?
The price and inventory of DS1812-10/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1812-10/T&R is usually 5 days.
3.What payment methods are accepted for DS1812-10/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1812-10/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1812-10/T&R?
DS1812-10/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1812-10/T&R 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 DS1812-10/T&R?
For technical support, including DS1812-10/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1812-10/T&R requirements.
6.How does Aetrix verify that DS1812-10/T&R is sourced from the original manufacturer or authorized distributors?
All DS1812-10/T&R 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 DS1812-10/T&R meets industry standards.
7.What is the process for return or replacement of DS1812-10/T&R?
All DS1812-10/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1812-10/T&R, 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 DS1812-10/T&R part is unused and in its original packaging.
Return procedure for DS1812-10/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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