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Analog Devices Inc./Maxim Integrated DS1812R-15+T&R
- Part No.:
- DS1812R-15+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DS1812R-15+T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,205
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Product details
Overview
DS1812R-15+T&R from Maxim Integrated is a 5V microprocessor supervisory circuit with active-high push-pull reset output, 4.00V–4.24V VCC trip point, 150ms reset timeout, and -40°C to +85°C operating temperature-used in embedded power-up sequencing for microcontrollers.
For engineers reviewing the DS1812R-15+T&R datasheet, DS1812R-15+T&R pinout, DS1812R-15+T&R application, or DS1812R-15+T&R equivalent, key selection criteria include reset threshold accuracy, guaranteed 150ms minimum reset pulse width, push-pull output drive capability, SOT-23 package compatibility, and temperature-compensated voltage sensing.
Technical Context
The DS1812R-15+T&R integrates a precision temperature-compensated voltage reference and comparator to monitor VCC against a fixed 4.13V typical trip threshold. It asserts RST high during power failure and holds it active for ≥100ms (typ. 150ms) after VCC returns to tolerance.
Its CMOS push-pull output drives logic-high directly without external pull-up, supports 350µA source current at 2.4V, and sinks up to 10mA at 0.4V-enabling direct interface with 5V TTL/CMOS microcontroller reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.00V (min) to 4.24V (max); ensures reliable reset assertion before 5V rail drops below microcontroller VDD min spec |
| Reset Pulse Width | 100–300ms; guarantees ≥150ms minimum active-high reset hold time for full processor stabilization |
| Output Type | Push-pull active-high; eliminates need for external pull-up resistor and supports direct MCU reset pin drive |
| Supply Current | 30–40µA; enables ultra-low-power operation in battery-backed or energy-constrained systems |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded control and automotive body electronics |
| Output Drive | Sinks 10mA at 0.4V; meets standard 5V TTL input low-level voltage requirement with margin |
Pinout & Package
SOT-23-3 surface-mount package with 1.3mm × 2.9mm footprint and gull-wing leads; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-high reset output | CMOS push-pull driver; asserts logic high during fault and power-up; no external pull-up required |
| 2 (VCC) | Power supply input | Accepts 1.2V–5.5V; internal reference and comparator operate across full range |
| 3 (GND) | Ground reference | Common return for VCC and RST; must be low-impedance path to avoid false resets |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage sensing | Temperature-compensated reference ensures ±1.5% trip point stability over -40°C to +85°C |
| Guaranteed reset timing | 150ms typ. active-high pulse width prevents premature MCU release before power rail settles |
| Low quiescent current | 30–40µA max ICC enables use in always-on monitoring circuits without significant battery drain |
| Push-pull output architecture | Eliminates external pull-up resistor, reduces BOM count, and improves noise immunity vs open-drain |
Applications
| Industrial PLC Controller | Smart Metering Module |
|---|---|
Use Scenario: Power interruption during firmware update or data logging causes brownout risk. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-high signal to halt CPU execution until 5V rail stabilizes ≥150ms post-recovery. Use Value: Prevents corrupted flash writes and register state loss by enforcing deterministic reset timing aligned with MCU datasheet requirements. | Use Scenario: Mains-powered electricity meter experiences transient dips due to load switching or grid events. IC Role / Device Role / Timing Role: Voltage monitor triggering controlled reset of metrology SoC when VCC falls below 4.13V threshold. Use Value: Ensures accurate energy accumulation resumes only after stable power is confirmed-no missed pulse counts or calibration drift. |
| Automotive Body Control Unit | Medical Diagnostic Handheld |
Use Scenario: Ignition cycling or alternator ripple induces sub-4.24V excursions on 5V domain powering microcontroller. IC Role / Device Role / Timing Role: Reset supervisor holding RST high for ≥150ms after VCC recovery to prevent erratic CAN bus initialization. Use Value: Guarantees clean boot sequence for safety-critical firmware, meeting ISO 16750-2 transient immunity requirements. | Use Scenario: Battery-operated handheld device undergoes rapid power-on from depleted Li-ion cell (<3.0V) rising to 5V via boost converter. IC Role / Device Role / Timing Role: Monitors boosted 5V rail and delays MCU release until voltage remains above 4.13V for ≥150ms. Use Value: Avoids boot failures caused by converter overshoot settling or capacitor charging transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD1+T | 4.63V fixed reset threshold; 240ms min reset timeout; open-drain output requiring pull-up | Designed for higher-VCC systems where 4.63V trip better matches 5V regulator dropout | Select when tighter 4.63V threshold and longer reset hold improve reliability in noisy 5V domains |
| TPS3808G15DBVR | Adjustable threshold (0.4–5.8V); 200ms default delay; push-pull output; 1.8–6.0V supply range | Supports multi-rail monitoring and wider input voltage flexibility than DS1812R-15+T&R | Choose when system requires programmable trip point or operation beyond 5.5V VCC |
Compared with MAX809TRD1+T and TPS3808G15DBVR, the DS1812R-15+T&R offers fixed 4.13V trip optimized for marginal 5V supplies, guaranteed 150ms reset hold, and minimal BOM impact via integrated push-pull output-making it ideal for cost-sensitive, space-constrained industrial controllers.
Availability
DS1812R-15+T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, and automotive body control units requiring stable component supply and long-term production continuity.
Supply support for DS1812R-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, automotive, and communications applications.
The DS1812R-15+T&R belongs to the EconoReset™ family-engineered for low-cost, high-reliability power supervision in resource-constrained embedded systems with strict reset timing requirements.
FAQ
What is the exact VCC trip point range for DS1812R-15+T&R?
The DS1812R-15+T&R has a guaranteed VCC trip point range of 4.00V (minimum) to 4.24V (maximum), with 4.13V typical. This 15% tolerance variant is specifically calibrated to assert reset before standard 5V microcontrollers drop below their operational VDD minimum, ensuring robust brownout protection without premature triggering.
Does DS1812R-15+T&R require an external pull-up resistor on the RST pin?
No, the DS1812R-15+T&R features a push-pull active-high output that drives RST directly to VCC or GND. Unlike open-drain supervisors, it eliminates the need for an external pull-up resistor-reducing component count, PCB area, and potential noise coupling on the reset line.
What is the guaranteed minimum reset pulse width for DS1812R-15+T&R?
The DS1812R-15+T&R guarantees a minimum reset pulse width of 100ms, with 150ms typical and up to 300ms maximum. This ensures sufficient time for 5V power rails and microcontroller internal regulators to stabilize before releasing the reset signal-meeting JEDEC and common MCU boot timing requirements.
Can DS1812R-15+T&R operate from a 3.3V supply?
Yes, the DS1812R-15+T&R operates from 1.2V to 5.5V, but its 4.00–4.24V trip point is designed for 5V systems. When powered from 3.3V, the internal reference remains functional, but the VCC monitor will not assert reset unless the supply exceeds 4.00V-so it is not suitable as a 3.3V supervisor without external level-shifting.
Is DS1812R-15+T&R available in TO-92 packaging?
No, the DS1812R-15+T&R is specified and shipped exclusively in SOT-23-3 tape-and-reel packaging. While the DS1812 family includes TO-92 variants (e.g., DS1812R-15+), the "+T&R" suffix confirms this specific orderable part is SOT-23 only, with gull-wing leads and 1.3mm × 2.9mm footprint.
DS1812R-15+T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconoReset
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
DS1812R-15+T&R FAQ
1.How can I place an order for DS1812R-15+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1812R-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 DS1812R-15+T&R reliable?
The price and inventory of DS1812R-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 DS1812R-15+T&R is usually 5 days.
3.What payment methods are accepted for DS1812R-15+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1812R-15+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1812R-15+T&R?
DS1812R-15+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1812R-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 DS1812R-15+T&R?
For technical support, including DS1812R-15+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1812R-15+T&R requirements.
6.How does Aetrix verify that DS1812R-15+T&R is sourced from the original manufacturer or authorized distributors?
All DS1812R-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 DS1812R-15+T&R meets industry standards.
7.What is the process for return or replacement of DS1812R-15+T&R?
All DS1812R-15+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1812R-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 DS1812R-15+T&R part is unused and in its original packaging.
Return procedure for DS1812R-15+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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