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Analog Devices Inc./Maxim Integrated DS1812R-5/T&R
- Part No.:
- DS1812R-5/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DS1812R-5/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,244
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Product details
Overview
DS1812R-5/T&R from Maxim Integrated is a 5V precision voltage supervisor IC with active-high push-pull reset output, 4.62V typical VCC trip point, 150ms reset timeout, and -40°C to +85°C operating range-used for microprocessor power-on reset and brown-out detection in embedded control systems.
For engineers reviewing the DS1812R-5/T&R datasheet, DS1812R-5/T&R pinout, DS1812R-5/T&R application, or DS1812R-5/T&R equivalent, key selection criteria include guaranteed 4.50–4.75V trip window, 100–300ms reset assertion time, push-pull drive capability (350µA high-level source), low 30–40µA quiescent current, and SOT-23-3 surface-mount compatibility.
Technical Context
The DS1812R-5/T&R integrates a temperature-compensated bandgap reference and comparator to monitor VCC against a fixed 4.62V threshold. It asserts RST immediately on undervoltage detection and holds it active for ≥100ms after VCC recovers to tolerance.
Its CMOS push-pull output drives logic inputs directly without pull-up resistors. The device operates across full industrial temperature range with no external components required-enabling single-chip reset supervision for 5V microcontroller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50V (min) to 4.75V (max); ensures reliable reset activation before 5V system brown-out |
| Reset Timeout | 100–300ms; guarantees stable power and processor initialization before release |
| Output Type | Push-pull active-high; eliminates need for external pull-up resistor |
| Supply Current | 30–40µA; enables ultra-low-power operation in battery-backed systems |
| Operating Temp | -40°C to +85°C; supports industrial-grade embedded deployment |
| Output Drive | 350µA VOH @ 2.4V; sufficient to drive TTL/CMOS inputs directly |
Pinout & Package
SOT-23-3 surface-mount package with 1.3mm × 2.9mm footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-high reset output | Drives microcontroller RESET pin directly; asserted low-to-high transition on power-up |
| 2 (VCC) | Power supply input | Monitored 5V rail; trip threshold applies only to this pin |
| 3 (GND) | Ground reference | Common return for internal reference and output stage; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage monitoring | ±1.5% trip accuracy over temperature ensures consistent reset behavior across -40°C to +85°C |
| Self-contained reset timing | No external capacitor or resistor needed-150ms timeout generated internally |
| Low quiescent current | 30–40µA ICC enables use in always-on supervisory circuits without significant battery drain |
| Push-pull output stage | Eliminates external pull-up, reduces BOM count, and improves noise immunity vs. open-drain alternatives |
Applications
| Industrial PLC Controller | Smart Metering Module |
|---|---|
Use Scenario: Power cycling during grid fluctuations causes intermittent MCU lockup in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: DS1812R-5/T&R monitors 5V supply and forces hard reset if voltage drops below 4.5V for >2µs. Use Value: Prevents firmware corruption by ensuring clean restart after brown-out, with 150ms hold time allowing LDO and clock stabilization. | Use Scenario: Battery-backed real-time clock and metrology ASIC require deterministic power-up sequence after main supply restoration. IC Role / Device Role / Timing Role: DS1812R-5/T&R provides synchronized reset pulse to both RTC and MCU upon 5V rail recovery. Use Value: Eliminates race conditions between subsystems by guaranteeing minimum 100ms reset assertion post-recovery. |
| IoT Edge Sensor Node | Medical Diagnostic Handheld |
Use Scenario: Intermittent USB power delivery causes unstable VCC during firmware updates in wireless sensor nodes. IC Role / Device Role / Timing Role: DS1812R-5/T&R detects sub-4.5V dips and asserts RST to halt update process until stable 5V resumes. Use Value: Protects flash memory integrity by preventing partial writes during undervoltage events. | Use Scenario: Portable diagnostic device uses Li-ion battery with buck-boost regulator delivering regulated 5V to ARM Cortex-M core. IC Role / Device Role / Timing Role: DS1812R-5/T&R supervises final 5V rail and resets MCU if regulator output falls outside ±5% tolerance. Use Value: Meets IEC 60601-1 safety requirement for controlled shutdown on power anomaly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G50DBVR | Fixed 5.0V trip point; 200ms reset timeout; higher ICC (1.5µA typ) | Requires external pull-up for open-drain output; less suitable for direct TTL interface | Prefer when tighter trip tolerance (±0.5%) and longer timeout are needed |
| MAX809TRD3+T | 4.63V trip point; 140ms min timeout; open-drain output; 1.6µA ICC | Needs pull-up resistor; lower quiescent current but added component count | Choose for ultra-low-power designs where board space allows pull-up |
Compared with TPS3808G50DBVR and MAX809TRD3+T, the DS1812R-5/T&R offers push-pull output eliminating external components, tighter trip window (4.50–4.75V), and optimized 150ms hold time-making it ideal for cost-sensitive, space-constrained 5V microcontroller reset applications requiring minimal BOM.
Availability
DS1812R-5/T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, IoT edge nodes, and portable medical devices requiring stable component supply and long-term manufacturability.
Supply support for DS1812R-5/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 markets.
The DS1812R-5/T&R belongs to the EconoReset™ family-engineered for low-cost, single-supply voltage supervision in resource-constrained embedded systems with no external timing components.
FAQ
What is the exact VCC trip voltage range for DS1812R-5/T&R?
The DS1812R-5/T&R has a guaranteed VCC trip point of 4.50V (minimum) to 4.75V (maximum), with 4.62V typical. This range is specified at -40°C to +85°C and ensures reliable reset activation before 5V systems enter unstable operating regions. The DS1812R-5/T&R uses an internal temperature-compensated reference to maintain trip accuracy across its full operating temperature range.
Does DS1812R-5/T&R require an external pull-up resistor on the RST pin?
No, the DS1812R-5/T&R features a push-pull active-high output that drives the RST pin directly without external components. Its output can source up to 350µA at 2.4V, enabling direct interface with standard TTL and CMOS inputs. This eliminates the need for a pull-up resistor, reducing BOM count and PCB area-key advantages of the DS1812R-5/T&R over open-drain supervisors.
How long does DS1812R-5/T&R hold the reset signal active after VCC recovery?
The DS1812R-5/T&R holds the RST signal active for 100ms (minimum) to 300ms (maximum) after VCC returns to within tolerance, with 150ms typical. This built-in timeout ensures sufficient stabilization time for the power supply and microprocessor before release. No external capacitor or timing component is required-the DS1812R-5/T&R generates this delay internally using precision circuitry.
What package type is used for DS1812R-5/T&R?
The DS1812R-5/T&R is supplied in the SOT-23-3 surface-mount package, measuring 1.3mm × 2.9mm with gull-wing leads. This compact, RoHS-compliant package supports automated pick-and-place assembly and reflow soldering per JEDEC J-STD-020. The DS1812R-5/T&R shares identical pinout and functionality with the through-hole TO-92 variant but is optimized for space-constrained PCB layouts.
Can DS1812R-5/T&R operate with supply voltages below 5V?
Yes, the DS1812R-5/T&R operates over VCC = 1.2V to 5.5V, but its 4.50–4.75V trip window is only valid when monitoring a nominal 5V rail. Below ~4.0V, the internal comparator may not assert reset reliably. For lower-voltage systems (e.g., 3.3V), the DS1812R-33/T&R variant with 3.08V trip point should be used instead of the DS1812R-5/T&R.
DS1812R-5/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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.62V
- 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-5/T&R FAQ
1.How can I place an order for DS1812R-5/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1812R-5/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-5/T&R reliable?
The price and inventory of DS1812R-5/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-5/T&R is usually 5 days.
3.What payment methods are accepted for DS1812R-5/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1812R-5/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1812R-5/T&R?
DS1812R-5/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1812R-5/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-5/T&R?
For technical support, including DS1812R-5/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1812R-5/T&R requirements.
6.How does Aetrix verify that DS1812R-5/T&R is sourced from the original manufacturer or authorized distributors?
All DS1812R-5/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-5/T&R meets industry standards.
7.What is the process for return or replacement of DS1812R-5/T&R?
All DS1812R-5/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1812R-5/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-5/T&R part is unused and in its original packaging.
Return procedure for DS1812R-5/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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