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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:
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Product details
Overview
DS1812R-5+T&R from Maxim Integrated (now Analog Devices) is a 5V precision voltage supervisor IC with active-high push-pull reset output, monitoring VCC trip point at 4.50–4.75 V and asserting reset for 100–300 ms after power-up or brownout recovery. It operates from -40°C to +85°C in SOT-23 package and is used in microprocessor power sequencing and embedded system reliability management.
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 150 ms reset timeout, ±2% VCC trip tolerance, push-pull drive capability up to 10 mA sink, and compatibility with 1.2–5.5 V supply rails in space-constrained industrial control and IoT edge nodes.
Technical Context
The DS1812R-5+T&R integrates a temperature-compensated bandgap reference and comparator to detect VCC deviations below 4.62 V (typical), triggering an immediate active-high RST assertion. Its internal timing circuit ensures minimum 100 ms and maximum 300 ms reset pulse width after VCC returns to tolerance.
It features CMOS-compatible push-pull output with VOH ≥ VCC − 0.1 V at 0–500 µA load and IOL = +10 mA at 0.4 V, eliminating external pull-up resistors. No external components are required for basic reset generation in 5 V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50–4.75 V; precise detection threshold for 5 V rail brownout/failure |
| Reset Timeout | 100–300 ms; guarantees stable power and processor initialization before release |
| Output Type | Push-pull active-high; drives logic directly without external pull-up resistor |
| Supply Range | 1.2–5.5 V; supports operation across wide input range including battery-backed systems |
| Operating Temp | -40°C to +85°C; qualified for industrial ambient environments |
| IOL / IOH | +10 mA sink / 350 µA source; sufficient to drive TTL/CMOS inputs and small capacitive loads |
| ICC (Quiescent) | 30–40 µA; ultra-low standby current for battery-sensitive applications |
Pinout & Package
SOT-23-3 surface-mount package with 1.3 mm × 2.9 mm footprint and 0.95 mm height; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-high reset output | CMOS push-pull driver; asserts high during power fault or startup, releases low when stable |
| 2 (VCC) | Power supply input | Monitored rail input; supplies internal reference and logic; accepts 1.2–5.5 V |
| 3 (GND) | Ground reference | Common return path for reference, comparator, and output stage; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage sensing | Temperature-compensated bandgap reference enables ±2% trip accuracy over full temperature range |
| No external components | Self-contained reset generator eliminates need for RC networks, comparators, or discrete transistors |
| Guaranteed reset timeout | 150 ms nominal delay ensures reliable microprocessor initialization after power recovery |
| Low quiescent current | 30–40 µA ICC allows integration into always-on subsystems without significant battery drain |
| Industrial temperature grade | -40°C to +85°C operation supports deployment in factory automation, metering, and outdoor electronics |
Applications
| Microcontroller Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Microcontroller-based sensor node powers on from battery or DC adapter with variable ramp time. IC Role / Device Role / Timing Role: DS1812R-5+T&R monitors VCC and holds reset active until rail stabilizes above 4.62 V for ≥150 ms. Use Value: Prevents firmware crash due to premature clock or memory access during power ramp. | Use Scenario: Programmable logic controller module experiences intermittent 5 V rail sag during relay switching. IC Role / Device Role / Timing Role: DS1812R-5+T&R detects sub-4.5 V dips and asserts RST within 5 µs to force controlled MCU reboot. Use Value: Eliminates uncontrolled state corruption and maintains deterministic I/O behavior under transient load conditions. |
| Smart Energy Metering | IoT Edge Gateway Boot Management |
Use Scenario: Electricity meter operates continuously on backup capacitor during AC mains interruption. IC Role / Device Role / Timing Role: DS1812R-5+T&R triggers reset when VCC drops below 4.5 V and sustains it for 200 ms after restoration. Use Value: Ensures EEPROM write completion and secure state save before power loss and clean restart on recovery. | Use Scenario: Cellular-connected gateway boots Linux from eMMC after cold start with noisy 5 V DC-DC output. IC Role / Device Role / Timing Role: DS1812R-5+T&R provides glitch-free reset signal synchronized to actual VCC stability-not just voltage crossing. Use Value: Avoids kernel panic from marginal supply during boot sequence by enforcing minimum 150 ms hold time. |
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 5.0 V threshold; 200 ms reset timeout; open-drain output requiring pull-up | Requires external resistor; slightly longer timeout; same industrial temp range | Choose if open-drain flexibility or TI ecosystem alignment is preferred |
| MAX6326UT46D3+ | 4.63 V threshold; 140 ms min timeout; push-pull output; same SOT-23-3 package | Identical pinout and drive strength; tighter trip tolerance (±0.5%) but higher ICC (100 µA) | Prefer for higher accuracy where quiescent current penalty is acceptable |
Compared with TPS3808G50DBVR and MAX6326UT46D3+, the DS1812R-5+T&R offers optimal balance of push-pull simplicity, 150 ms nominal timeout, and ultra-low 35 µA typical ICC-making it ideal for cost-sensitive, space-constrained, and battery-aware 5 V microcontroller systems.
Availability
DS1812R-5+T&R is available at Aetrix Electronics and suitable for industrial control, smart metering, and IoT edge device designs 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
Analog Devices (acquired Maxim Integrated in 2021) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The DS1812R-5+T&R belongs to Maxim's EconoReset™ family-designed specifically for cost-effective, single-supply voltage monitoring and reset generation in resource-constrained embedded systems.
FAQ
What is the exact VCC trip point range for DS1812R-5+T&R?
The DS1812R-5+T&R has a guaranteed VCC trip point range of 4.50 V to 4.75 V at +25°C, with typical value 4.62 V. This tolerance is maintained across the full operating temperature range (-40°C to +85°C) using internal temperature compensation, ensuring consistent 5 V rail supervision regardless of ambient conditions. The "R-5" suffix confirms this is the 5% tolerance variant.
Does DS1812R-5+T&R require an external pull-up resistor on the RST pin?
No, DS1812R-5+T&R does not require an external pull-up resistor because it features a push-pull active-high output stage. The RST pin actively drives high during reset and low otherwise, delivering VOH ≥ VCC − 0.1 V and sinking up to +10 mA. This eliminates board space and BOM cost associated with discrete pull-ups-confirmed in the DC Electrical Characteristics table and Pin Assignment section.
How long is the reset pulse duration of DS1812R-5+T&R after VCC recovery?
The DS1812R-5+T&R asserts reset for 100–300 ms after VCC returns to an in-tolerance condition, with 150 ms being the nominal duration. This is specified as tRST and tRPU in the AC Electrical Characteristics table. The timing is internally generated and independent of external components, ensuring reliable microprocessor stabilization before release.
Can DS1812R-5+T&R operate with supply voltages below 5 V?
Yes, DS1812R-5+T&R operates from 1.2 V to 5.5 V per Recommended DC Operating Conditions. However, its VCC trip point remains fixed at ~4.62 V, so it only functions as a 5 V supervisor: when VCC < 4.5 V, RST is asserted; when VCC ≥ 4.75 V, RST is released. Operation below 4.5 V is valid for quiescent monitoring but will keep RST active.
Is DS1812R-5+T&R pin-compatible with other devices in the DS181x family?
Yes, DS1812R-5+T&R shares identical SOT-23-3 pinout (RST-VCC-GND) with DS1811, DS1813, and DS1815 variants. All use the same TO-92 and SOT-23 footprints and terminal assignments. However, trip voltages differ: DS1811R-5 is 4.25–4.49 V, DS1813R-5 is 3.00–3.15 V-so electrical substitution requires verification of threshold match for the target rail.
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:
- Active
- 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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