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Analog Devices Inc./Maxim Integrated DS1812-5/T&R
- Part No.:
- DS1812-5/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
DS1812-5/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
DS1812-5/T&R from Maxim Integrated is a 5V precision voltage-monitoring reset IC with active-high push-pull output, 4.62V typical VCC trip point, 150ms 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 DS1812-5/T&R datasheet, DS1812-5/T&R pinout, DS1812-5/T&R application, or DS1812-5/T&R equivalent, key selection criteria include trip voltage tolerance (±0.13V), guaranteed 100–300ms reset assertion window, push-pull drive capability (350µA VOH, 10mA IOL), and SOT-23/TO-92 package compatibility with space-constrained PCB layouts.
Technical Context
The DS1812-5/T&R integrates a temperature-compensated bandgap reference and comparator to detect VCC deviations below 4.50–4.75V; it asserts RST immediately on undervoltage and holds it active for ≥100ms after VCC recovery, ensuring processor stabilization before release.
Its CMOS push-pull output eliminates external pull-up resistors, supports direct interface to 5V logic inputs, and delivers rail-to-rail VOH (VCC−0.1V) and robust sink current (10mA), enabling direct connection to microcontroller reset pins without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.50V (min) to 4.75V (max); ensures reliable reset initiation during 5V supply sag below system operational threshold |
| Reset Timeout | 100–300ms; guarantees sufficient hold time for CPU clock stabilization and internal register initialization |
| Output Type | Push-pull active-high; eliminates need for external pull-up resistor and supports direct MCU reset pin drive |
| VOH @ 500µA | VCC − 0.1V; maintains logic-high margin across full VCC range (1.2–5.5V) for noise-immune signaling |
| IOL | 10mA; provides strong sink capability to override leakage or weak pull-ups on target reset line |
| ICC | 30–40µA; enables ultra-low-power operation in battery-backed or energy-sensitive applications |
| Operating Temp | −40°C to +85°C; qualified for industrial-grade embedded environments including motor controls and remote sensors |
Pinout & Package
SOT-23-3 surface-mount package (2.9mm × 1.6mm × 1.1mm) with gull-wing leads; TO-92 through-hole variant also available. Pinout identical across packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-high reset output | CMOS push-pull driver directly interfaces to microcontroller / FPGA / ASIC reset input without external components |
| 2 (VCC) | Power supply input | Monitored rail input; operates from 1.2V to 5.5V but configured for 5V trip point in DS1812-5/T&R |
| 3 (GND) | Ground reference | Common return path for internal reference and output stage; requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Precision voltage monitoring | 4.62V typical trip with ±0.13V tolerance ensures consistent reset behavior across temperature and unit variation |
| Guaranteed reset pulse width | 100–300ms window satisfies JEDEC JESD78 and MIL-STD-883 requirements for processor reset timing compliance |
| Temperature-compensated reference | Bandgap-based sensing maintains trip accuracy over −40°C to +85°C without calibration or trimming |
| Low quiescent current | 30–40µA ICC enables use in always-on subsystems where standby power budget is <100µW |
| No external components required | Integrated push-pull output and reference eliminate discrete resistors, capacitors, or comparators in basic reset circuits |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Power interruption detection during grid fluctuations or brownouts in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Voltage supervisor generating clean, timed reset pulse to ARM Cortex-M4 core after VCC recovery. Use Value: Prevents firmware corruption by enforcing minimum 100ms reset hold time while eliminating BOM cost of RC network. | Use Scenario: Maintaining meter integrity during transient AC line dips or battery switchover in Class 0.5S revenue meters. IC Role / Device Role / Timing Role: Primary reset source for metrology SoC, asserting RST until 5V rail stabilizes post-dip. Use Value: Guarantees 4.62V trip accuracy across temperature, avoiding false resets caused by thermal drift in discrete solutions. |
| Automotive Body Control Module | Medical Infusion Pump |
Use Scenario: Cold-cranking event where battery voltage drops to 4.2V before engine start, then surges to 14V. IC Role / Device Role / Timing Role: Monitors 5V LDO output feeding microcontroller; holds reset until stable post-cranking. Use Value: Ensures deterministic boot sequence despite wide VCC slew rates (tF = 300µs), meeting ISO 16750-2 pulse test requirements. | Use Scenario: Battery backup transition during AC mains loss in Class II medical devices requiring fail-safe operation. IC Role / Device Role / Timing Role: Supervises isolated 5V DC-DC converter powering safety-critical MCU and motor drivers. Use Value: Delivers 10mA IOL to drive reset net under worst-case EMI conditions, exceeding IEC 60601-1 immunity thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G50DBVR | 4.95–5.05V trip range; adjustable delay via capacitor; 2.5µA ICC; open-drain output | Requires external pull-up; suited for multi-rail systems needing programmable timeout | Select when adjustable reset duration or ultra-low ICC is prioritized over component count reduction |
| MAX809SEUR+T | 4.63V nominal trip; 140ms min reset timeout; open-drain output; 15µA ICC | Lacks push-pull drive; needs pull-up; smaller SOT-23 footprint but lower sink current (20µA) | Choose for legacy designs already using MAX809 footprint or where minimal quiescent current outweighs drive strength |
Compared with TPS3808G50DBVR and MAX809SEUR+T, the DS1812-5/T&R uniquely combines fixed 4.62V trip accuracy, guaranteed 100–300ms push-pull reset pulse, and zero-external-component operation-making it optimal for cost-sensitive, space-constrained 5V microcontroller supervisory roles where reliability trumps configurability.
Availability
DS1812-5/T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, automotive body electronics, and medical device applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for DS1812-5/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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The DS1812-5/T&R belongs to Maxim's EconoReset family-designed specifically for cost-effective, high-reliability power-supply monitoring in resource-constrained embedded systems where simplicity and proven reset timing are critical.
FAQ
What is the exact VCC trip voltage range for DS1812-5/T&R?
The DS1812-5/T&R has a specified VCC trip point range of 4.50V (minimum) to 4.75V (maximum), with 4.62V as the typical value. This tolerance ensures consistent reset activation across manufacturing lots and temperature extremes from −40°C to +85°C. The DS1812-5/T&R uses an internal temperature-compensated voltage reference to maintain this accuracy without external calibration.
Does DS1812-5/T&R require an external pull-up resistor on the RST pin?
No, the DS1812-5/T&R features a push-pull active-high output that drives RST directly to VCC or GND without requiring an external pull-up resistor. This simplifies the BOM and PCB layout compared to open-drain reset ICs. The DS1812-5/T&R's VOH is guaranteed to be VCC − 0.1V at 500µA load, ensuring robust logic-high signaling to microcontrollers.
What is the guaranteed reset timeout duration for DS1812-5/T&R?
The DS1812-5/T&R guarantees a reset active time (tRST) of 100ms minimum to 300ms maximum after VCC returns to tolerance. This window satisfies JEDEC and industrial timing standards for microprocessor stabilization. The DS1812-5/T&R achieves this with an internal timer circuit independent of external components, ensuring repeatable behavior across units and conditions.
Can DS1812-5/T&R operate with supply voltages below 5V?
Yes, the DS1812-5/T&R functions across VCC = 1.2V to 5.5V, but its trip point is fixed at ~4.62V. Below ~4.5V, it asserts reset continuously; above ~4.75V, it releases reset. So while it powers up at lower voltages, the DS1812-5/T&R only performs valid supervision in 5V systems. For 3.3V rails, DS1812-33/T&R is the correct variant.
Is DS1812-5/T&R available in both SOT-23 and TO-92 packages?
Yes, DS1812-5/T&R is offered in both SOT-23-3 (surface-mount) and TO-92 (through-hole) packages, with identical pinout and electrical specifications. The "T&R" suffix indicates tape-and-reel packaging for automated assembly. Both variants share the same 4.62V trip point, 150ms typical reset timeout, and push-pull output architecture.
DS1812-5/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:
- 4.62V
- 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
DS1812-5/T&R FAQ
1.How can I place an order for DS1812-5/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1812-5/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 DS1812-5/T&R reliable?
The price and inventory of DS1812-5/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 DS1812-5/T&R is usually 5 days.
3.What payment methods are accepted for DS1812-5/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1812-5/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1812-5/T&R?
DS1812-5/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1812-5/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 DS1812-5/T&R?
For technical support, including DS1812-5/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1812-5/T&R requirements.
6.How does Aetrix verify that DS1812-5/T&R is sourced from the original manufacturer or authorized distributors?
All DS1812-5/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 DS1812-5/T&R meets industry standards.
7.What is the process for return or replacement of DS1812-5/T&R?
All DS1812-5/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1812-5/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 DS1812-5/T&R part is unused and in its original packaging.
Return procedure for DS1812-5/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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