My Inquiry
My Account
Analog Devices Inc./Maxim Integrated DS1816-20/T&R
- Part No.:
- DS1816-20/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
DS1816-20/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,372
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS1816-20/T&R from Maxim Integrated (now Analog Devices) is a 3.3V precision voltage-monitoring supervisory IC with open-drain active-low reset output, 20% VCC trip tolerance (2.47V–2.64V), 150ms reset timeout, and internal 5kΩ pull-up resistor-used for reliable microprocessor reset in battery-backed or low-voltage embedded systems.
For engineers reviewing the DS1816-20/T&R datasheet, DS1816-20/T&R pinout, DS1816-20/T&R application, or DS1816-20/T&R equivalent, key selection criteria include trip point accuracy, reset timeout stability over temperature, open-drain drive capability, package compatibility (SOT-23/TO-92), and supply current under 35µA.
Technical Context
The DS1816-20/T&R integrates a temperature-compensated voltage reference and comparator to detect VCC deviations beyond ±20% of nominal 3.3V. It asserts RST low on power failure and holds reset active for 100–250ms after VCC recovery, ensuring processor stabilization.
Its open-drain output supports flexible interface logic levels via external or internal pull-up; the internal 3.5–7.5kΩ resistor enables direct connection to 3.3V or 5V microcontroller reset inputs without discrete components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.47V (min) to 2.64V (max) - precise detection threshold for 3.3V systems operating at ±20% tolerance |
| Reset Timeout (tRST) | 100–250ms - guaranteed minimum hold time ensures stable power-up sequencing for MCUs |
| Supply Current (ICC) | 28–35µA - ultra-low quiescent current extends battery life in always-on monitoring applications |
| Output Type | Open-drain with internal 5kΩ pull-up - eliminates need for external pull-up in most 3.3V reset circuits |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded and automotive accessory environments |
| Output Drive (IOL) | 10mA @ 0.4V - sufficient sink current to directly drive standard CMOS reset inputs |
Pinout & Package
DS1816-20/T&R is supplied in SOT-23 package (tape-and-reel), with identical pin mapping to TO-92 variant: Pin 1 = RST (active-low open-drain reset output), Pin 2 = VCC (power supply input), Pin 3 = GND (ground reference).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-low reset output | Open-drain driver sinks current during reset; requires pull-up (internal or external) to assert high-impedance or logic-high state |
| 2 (VCC) | Power supply input | Supplies internal reference and comparator; operates from 1.2V to 5.5V, enabling use across 3.3V and 5V systems |
| 3 (GND) | Ground reference | Common return path for internal circuitry and output stage; must be low-impedance for accurate voltage monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Precision ±20% VCC monitoring | Guaranteed trip window (2.47V–2.64V) ensures robust reset assertion in noisy 3.3V supply rails |
| 150ms typ. reset timeout | Fixed delay prevents premature MCU release before power and clock stabilization |
| Internal 5kΩ pull-up resistor | Reduces BOM count by eliminating external pull-up in standard 3.3V reset interfaces |
| Temperature-compensated reference | Maintains trip point accuracy across -40°C to +85°C without calibration or trimming |
| Low 35µA supply current | Enables continuous supervision in energy-constrained battery-powered devices |
Applications
| Industrial PLC I/O Module | Smart Meter Power Monitoring |
|---|---|
Use Scenario: Monitors 3.3V auxiliary rail in programmable logic controller modules subject to brownouts and EMI-induced supply dips. IC Role / Device Role / Timing Role: Supervisory IC generating clean, debounced reset pulse to ARM Cortex-M4 MCU upon VCC deviation. Use Value: Prevents firmware corruption during transient undervoltage events with guaranteed 150ms hold time and ±20% trip accuracy. | Use Scenario: Embedded in utility smart meters to supervise backup battery charging circuit and main 3.3V system rail. IC Role / Device Role / Timing Role: Voltage monitor asserting reset to metering SoC when primary supply falls below 2.47V during grid outage. Use Value: Ensures deterministic restart after power restoration using internal temperature-stable reference and no external components. |
| Wireless Sensor Node | Automotive Body Control Module |
Use Scenario: Powers ultra-low-power IoT sensor nodes with coin-cell batteries where supply voltage drifts near cutoff. IC Role / Device Role / Timing Role: Reset supervisor holding nRST low until 3.3V rail stabilizes post-wake, preventing spurious boot cycles. Use Value: Achieves reliable cold-start operation with 28µA ICC and 2.47V trip point optimized for Li-MnO₂ battery discharge profile. | Use Scenario: Used in non-safety-critical BCM submodules (e.g., door lock control) requiring robust reset under load-dump or cold-crank conditions. IC Role / Device Role / Timing Role: Standalone reset generator interfacing with Infineon AURIX™ TC2xx microcontroller reset pin. Use Value: Delivers industrial-grade temperature stability (-40°C to +85°C) and open-drain flexibility compatible with 5V-tolerant MCU inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326–23D | 2.32V fixed trip point, 140ms min reset timeout, 1.8–5.5V supply range, SOT-23-3 | Narrower 2.32V trip suits 2.5V systems; lacks internal pull-up - requires external 4.7kΩ resistor | Select when tighter trip accuracy (<±1.5%) and wider VCC range needed, but accept added component count |
| TPS3808G12DBVR | 1.22V trip, adjustable timeout (up to 2s), 1.8–6.5V supply, 2.5µA ICC, SOT-23-6 | Higher pin count, programmable delay, lower current - designed for ultra-low-power apps with timing flexibility | Choose for battery-powered designs needing <3µA quiescent current and configurable reset duration |
Compared with MAX6326–23D and TPS3808G12DBVR, the DS1816-20/T&R offers integrated pull-up and fixed 20% trip optimized for cost-sensitive 3.3V systems, trading programmability and ultra-low ICC for simplicity and BOM reduction.
Availability
DS1816-20/T&R is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart meter power supervision, wireless sensor nodes, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for DS1816-20/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 DS1816-20/T&R belongs to the EconoReset™ family of supervisory ICs engineered for low-cost, high-reliability power monitoring in resource-constrained embedded systems with minimal external components.
FAQ
What is the exact VCC trip voltage range for DS1816-20/T&R?
The DS1816-20/T&R has a guaranteed VCC trip point range of 2.47V (minimum) to 2.64V (maximum) at -40°C to +85°C, corresponding to ±20% tolerance around a nominal 3.3V supply. This range is specified in the DC Electrical Characteristics table and validated across temperature and process corners - critical for reliable reset assertion in 3.3V systems experiencing voltage sag.
Does DS1816-20/T&R require an external pull-up resistor?
No, DS1816-20/T&R includes an internal pull-up resistor of 3.5–7.5kΩ on the RST pin, enabling direct connection to 3.3V or 5V microcontroller reset inputs without external components. However, if higher sink current or faster rise time is required, a 1kΩ external pull-up may be added per Note 3 in the datasheet - but it is not mandatory for basic operation.
What is the reset timeout behavior of DS1816-20/T&R during power-up?
During power-up, DS1816-20/T&R holds the RST pin low for 100–250ms after VCC crosses the trip threshold (2.47V–2.64V), with 150ms typical. This ensures the microprocessor and power supply stabilize before release - a fixed delay independent of VCC slew rate, verified across temperature and supply variations per AC Electrical Characteristics.
Can DS1816-20/T&R operate with a 5V supply?
Yes, DS1816-20/T&R supports VCC from 1.2V to 5.5V, making it compatible with both 3.3V and 5V systems. Its 2.47–2.64V trip point remains valid regardless of supply voltage, allowing use in mixed-rail designs where only the monitored rail is 3.3V - e.g., supervising a 3.3V LDO output powered from a 5V bus.
Is DS1816-20/T&R pin-compatible with other DS1816 variants like DS1816-10 or DS1816-5?
Yes, all DS1816 variants (including DS1816-5, DS1816-10, and DS1816-20) share identical SOT-23 and TO-92 pinouts, electrical interfaces, and timing behavior - differing only in trip voltage thresholds. This allows drop-in replacement within the same package when adjusting supervision tolerance without PCB changes.
DS1816-20/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:
- 2.55V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
DS1816-20/T&R FAQ
1.How can I place an order for DS1816-20/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1816-20/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 DS1816-20/T&R reliable?
The price and inventory of DS1816-20/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 DS1816-20/T&R is usually 5 days.
3.What payment methods are accepted for DS1816-20/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1816-20/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1816-20/T&R?
DS1816-20/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1816-20/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 DS1816-20/T&R?
For technical support, including DS1816-20/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1816-20/T&R requirements.
6.How does Aetrix verify that DS1816-20/T&R is sourced from the original manufacturer or authorized distributors?
All DS1816-20/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 DS1816-20/T&R meets industry standards.
7.What is the process for return or replacement of DS1816-20/T&R?
All DS1816-20/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1816-20/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 DS1816-20/T&R part is unused and in its original packaging.
Return procedure for DS1816-20/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1816-20/T&R Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
