DS1818R-20+T&R Maxim Integrated Integrated Circuit (SOT23 (3-Pin)) In Stock
Maxim DS1818R-20+T&R is a single-channel MPU supervisor IC with 2.55V reset threshold, 150ms reset delay, and active-low open-drain output in a SOT-23-3 package. Supports 1V to 5.5V supply range with manual reset input. Available from stock worldwide with fast shipping.
- Manufacturer
- Maxim Integrated
- Package
- SOT23 (3-Pin)
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- DS1818R-20+T&R Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $2.0892(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 2.55V undervoltage reset threshold with 150ms reset delay ensures stable microprocessor startup under varying power-up ramp conditions
- Active-low open-drain reset output compatible with both 3.3V and 5V logic systems operating from 1V to 5.5V supply range
- Manual reset input pin allows external pushbutton or logic-controlled system reset in ultra-compact SOT-23-3 package
Applications
The DS1818R-20+T&R is used to supervise microcontroller and processor power rails in embedded systems, industrial controllers, and consumer electronics, asserting a clean reset signal when VCC drops below 2.55V. Its 150ms reset delay holds the processor in reset long enough for supply voltage to stabilize after power-up, preventing code execution from corrupted initial states. The SOT-23-3 package and wide 1V to 5.5V supply range make it suitable for battery-powered devices, IoT nodes, and 3.3V MCU designs.
Specifications
| Manufacturer Package Code | 3-SOT_23-N/A |
| Reach Compliance Code | Compliant |
| Date Of Intro | 1999-11-19 |
| YTEOL | 9 |
| Additional Feature | BAT BUP SW:N;MNL RST:Y;OV DET:N;PW FL IP:N;PW FL IO:N;PW FL OP:N;PRG RST DLY:N;UV DET:N;WD:N;WWD:N |
| Adjustable Threshold | NO |
| Analog IC - Other Type | VOLTAGE SUPERVISOR/RESET IC |
| JESD-30 Code | R-PDSO-G3 |
| JESD-609 Code | e3 |
| Number of Channels | 1 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TO-236 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 0.035mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1.2V |
| Supply Voltage-Nom (Vsup) | 3.3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.95mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +2.55V |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | SOT23 (3-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Japan, Mainland China, Malaysia, Philippines, Singapore, South Korea, Taiwan, Thailand, USA |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What reset threshold voltage and assertion delay does the DS1818R-20+T&R provide?
The DS1818R-20+T&R asserts its active-low reset output when VCC falls below 2.55V and holds reset for a guaranteed 150ms minimum timeout after VCC recovers above threshold. This combination prevents premature microcontroller code execution during slow or noisy power-up sequences in embedded designs.
Which supply voltage range does DS1818R-20+T&R support, and does it operate from a single coin cell battery?
The DS1818R-20+T&R operates across a 1V to 5.5V supply voltage range, enabling use directly from a single CR2032 coin cell (3V nominal), two AA alkaline cells, or regulated 3.3V and 5V MCU supply rails without any additional circuitry or level translation.
How does the manual reset pin on the DS1818R-20+T&R benefit system debug and maintenance?
The active-low manual reset input pin allows an external pushbutton or open-collector logic signal to force a system reset independently of supply voltage conditions. This feature is valuable during firmware development, field service procedures, and watchdog recovery scenarios where software-initiated reset via MCU GPIO is unavailable or unreliable.
When should a designer choose the DS1818R-20+T&R over alternatives with adjustable threshold voltages?
The DS1818R-20+T&R is the correct choice when the target system power rail is fixed at 2.5V or 3.3V and no threshold programming resistor network is desired, reducing BOM to just 1 component in a SOT-23-3 footprint. Adjustable-threshold supervisors like the MAX809 require external dividers, adding cost and PCB area when the 2.55V fixed threshold already matches the monitored rail.
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About Maxim Integrated
Maxim Integrated is a leading electronic component manufacturer. FindMyChip sources Maxim Integrated ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $2.4970 | $2.50 |
| 10+ | $2.4560 | $24.56 |
| 25+ | $2.4150 | $60.38 |
| 500+ | $2.2270 | $1113.50 |
| 1000+ | $2.1653 | $2165.33 |
| 3000+ | $2.0892 | $6267.54 |
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