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Analog Devices Inc./Maxim Integrated DS1812-15/T&R
- Part No.:
- DS1812-15/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
DS1812-15/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,729
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Product details
Overview
DS1812-15/T&R from Maxim Integrated is a precision voltage-monitoring supervisor IC with active-high push-pull reset output, 4.13 V typical VCC trip point, 150 ms reset timeout, and -40°C to +85°C operating range-used for reliable microprocessor power-up sequencing in embedded control systems.
For engineers reviewing the DS1812-15/T&R datasheet, DS1812-15/T&R pinout, DS1812-15/T&R application, or DS1812-15/T&R equivalent, key selection criteria include trip voltage tolerance (±0.13 V), guaranteed 100–300 ms reset assertion window, push-pull drive capability (350 µA VOH, 10 mA IOL), SOT-23-3 package compatibility, and absence of external components.
Technical Context
The DS1812-15/T&R implements a temperature-compensated bandgap reference and comparator to detect VCC falling below 4.00–4.24 V (15% nominal threshold). It asserts RST immediately on undervoltage and holds it active for ≥100 ms after VCC recovers-ensuring stable processor initialization.
No external capacitor or resistor is required; internal timing is fixed. The push-pull output drives directly into CMOS/TTL inputs without pull-up, supporting logic-level compatibility across 1.2–5.5 V supply range while consuming only 30–40 µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.00 V (min) to 4.24 V (max); precise 15% under 5 V rail ensures robust brown-out detection before MCU instability |
| Reset Timeout | 100–300 ms; guarantees sufficient stabilization time for 5 V power supplies and microcontrollers post-recovery |
| Output Type | Push-pull active-high; eliminates need for external pull-up resistor and supports direct interface to CMOS/TTL reset inputs |
| Supply Range | 1.2 V to 5.5 V; enables operation across wide input rails including 3.3 V and 5 V systems |
| Quiescent Current | 30–40 µA; ultra-low power draw preserves battery life in always-on monitoring applications |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded environments without derating |
Pinout & Package
SOT-23-3 surface-mount package with 1.3 mm × 2.9 mm footprint and gull-wing leads; compatible with standard reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-high reset output | Push-pull CMOS driver capable of sourcing 350 µA and sinking 10 mA; directly interfaces to MCU /RESET pin |
| 2 (VCC) | Power supply input | Accepts 1.2–5.5 V; powers internal reference, comparator, and output stage; no bypass cap required |
| 3 (GND) | Ground reference | Common return path for VCC and RST; must be low-impedance to ensure accurate trip-point stability |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage threshold | 4.13 V typical trip point with ±0.13 V tolerance ensures consistent brown-out response across temperature and supply variation |
| Fixed reset timeout | Guaranteed 100–300 ms assertion window eliminates need for external RC timing network and reduces BOM count |
| Push-pull output stage | Drives high/low without external components-reduces layout complexity and improves noise immunity vs. open-drain alternatives |
| Temperature compensation | Internal bandgap reference maintains trip accuracy over -40°C to +85°C, avoiding calibration drift in industrial environments |
Applications
| Industrial PLC Controller | Smart Meter Power Management |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller subjected to fluctuating 24 V DC input converted to 5 V via switching regulator. IC Role / Device Role / Timing Role: Voltage supervisor ensuring clean reset during input dips or regulator transients. Use Value: Prevents firmware corruption by holding reset until regulated 5 V rail stabilizes for ≥150 ms post-recovery. | Use Scenario: Battery-backed electricity meter with real-time clock and metrology ASIC powered from dual 3.3 V/5 V rails. IC Role / Device Role / Timing Role: Primary reset generator triggered when main 5 V supply falls below 4.13 V due to grid anomaly or battery depletion. Use Value: Guarantees atomic state recovery of metrology core and RTC before application restart, preserving billing integrity. |
| Embedded HVAC Controller | Point-of-Sale Terminal |
Use Scenario: Fan-coil unit controller exposed to automotive-grade 12 V battery fluctuations and cold-cranking events. IC Role / Device Role / Timing Role: Brown-out detector asserting reset during voltage sags below 4.0 V to prevent erratic actuator commands. Use Value: Eliminates need for discrete Zener + capacitor reset circuit-reducing PCB area by >60% and improving long-term reliability. | Use Scenario: Retail terminal with ARM Cortex-M4 MCU, display driver, and EMV contactless reader sharing a single 5 V SMPS. IC Role / Device Role / Timing Role: System-level power monitor coordinating safe shutdown and boot sequencing across multiple subsystems. Use Value: Ensures all peripherals are held in reset until 5 V rail settles within tolerance, preventing bus contention during power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326–41D | 4.1 V trip point, 140 ms min reset timeout, open-drain output requiring external pull-up | Lacks push-pull drive; requires additional resistor and increases board space | Choose if legacy design already uses pull-up or needs adjustable timeout via external capacitor |
| TPS3808G15 | 4.15 V trip point, 200 ms fixed timeout, push-pull output, 1.8–6 V supply range | Wider supply range and tighter trip tolerance (±0.5%), but larger SOT-23-6 footprint | Prefer when higher supply flexibility or tighter accuracy is required and PCB layout allows 6-pin variant |
Compared with MAX6326–41D and TPS3808G15, the DS1812-15/T&R delivers identical trip accuracy and reset timing in the smallest possible SOT-23-3 form factor with zero external components-making it optimal for space-constrained, cost-sensitive industrial controllers.
Availability
DS1812-15/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart meter power management, and embedded HVAC systems requiring stable component supply and long-term production continuity.
Supply support for DS1812-15/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, communications, and computing applications.
The DS1812-15/T&R belongs to the EconoReset™ family-engineered for low-cost, minimal-footprint power-supply supervision in resource-constrained embedded systems where reliability and simplicity are critical.
FAQ
What is the exact VCC trip voltage range for DS1812-15/T&R?
The DS1812-15/T&R has a guaranteed VCC trip point between 4.00 V (minimum) and 4.24 V (maximum), with 4.13 V typical. This 15% threshold relative to 5 V ensures reliable detection of brown-out conditions before microcontroller operation becomes unstable, and is fully specified across -40°C to +85°C.
Does DS1812-15/T&R require an external pull-up resistor on the RST pin?
No. The DS1812-15/T&R features a push-pull active-high output that sources up to 350 µA and sinks up to 10 mA-enabling direct connection to standard CMOS/TTL reset inputs without any external components. This eliminates BOM cost and layout overhead associated with open-drain supervisors.
How long is the reset pulse duration of DS1812-15/T&R after VCC recovery?
The DS1812-15/T&R asserts RST for 100–300 ms after VCC returns to tolerance, with 150 ms typical. This fixed internal timer ensures sufficient stabilization time for both the power supply and attached microprocessor, eliminating variability caused by external RC networks.
Can DS1812-15/T&R operate from a 3.3 V supply?
Yes. The DS1812-15/T&R operates across 1.2 V to 5.5 V, and its internal reference remains accurate down to 1.2 V. However, its 4.00–4.24 V trip point is optimized for 5 V systems; for 3.3 V rails, consider DS1812-33 variants or alternative supervisors with lower thresholds.
What package type does DS1812-15/T&R use, and is it RoHS compliant?
The DS1812-15/T&R is supplied in the SOT-23-3 package (1.3 mm × 2.9 mm), tape-and-reel format (T&R), and is RoHS compliant per Maxim Integrated's standard manufacturing process. Mechanical drawings and thermal data are available in the official datasheet revision dated 2007.
DS1812-15/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:
- 4.13V
- 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
DS1812-15/T&R FAQ
1.How can I place an order for DS1812-15/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1812-15/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 DS1812-15/T&R reliable?
The price and inventory of DS1812-15/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 DS1812-15/T&R is usually 5 days.
3.What payment methods are accepted for DS1812-15/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1812-15/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1812-15/T&R?
DS1812-15/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1812-15/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 DS1812-15/T&R?
For technical support, including DS1812-15/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1812-15/T&R requirements.
6.How does Aetrix verify that DS1812-15/T&R is sourced from the original manufacturer or authorized distributors?
All DS1812-15/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 DS1812-15/T&R meets industry standards.
7.What is the process for return or replacement of DS1812-15/T&R?
All DS1812-15/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1812-15/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 DS1812-15/T&R part is unused and in its original packaging.
Return procedure for DS1812-15/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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