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Texas Instruments SM72240MF-3.08/NOPB
- Part No.:
- SM72240MF-3.08/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SM72240MF-3.08/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
SM72240MF-3.08/NOPB from Texas Instruments is a precision 3.08 V microprocessor supervisory circuit in a 5-pin SOT-23 package, designed for reliable power-on reset, brown-out detection, and manual reset assertion in 3.3 V digital systems. It delivers a 190 ms typical reset timeout, operates from −40°C to +125°C, draws only 7 µA at 3.6 V, and features an active-low open-drain RESET output valid down to VCC ≥ 1 V - ideal for solar energy monitoring and battery-powered embedded controllers.
For engineers reviewing the SM72240MF-3.08/NOPB datasheet, SM72240MF-3.08/NOPB pinout, SM72240MF-3.08/NOPB application, or SM72240MF-3.08/NOPB equivalent, key selection criteria include its factory-trimmed 3.08 V reset threshold (±0.05 V), MR input debouncing with 22 kΩ internal pull-up, immunity to sub-100 ns glitches, and compatibility with MAX811/812-based designs requiring extended temperature operation.
Technical Context
The SM72240MF-3.08/NOPB integrates three comparators - one for VCC monitoring against a precision 1.225 V reference, one for MR input validation, and one for low-line detection - feeding into reset logic with a monostable timer. Its reset assertion is latched until VCC exceeds the 3.08 V threshold and remains stable for ≥190 ms post-threshold crossing.
It uses a bandgap-derived reference with 30 ppm/°C tempco and supports open-drain interfacing up to 5.5 V, enabling level-shifting across mixed-voltage domains. The MR input accepts logic-level signals and provides glitch immunity ≤100 ns, while RESET remains functional even as VCC drops to 1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±0.05 V - precisely monitors 3.3 V supplies within 91.8–95.2% tolerance window |
| Reset Timeout | 190 ms typical - ensures sufficient hold time for full microprocessor initialization |
| Supply Current | 7 µA typical at 3.6 V - enables multi-year operation in energy-constrained solar or portable systems |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, industrial solar inverters, and outdoor electronics |
| RESET Output | Active-low open-drain - allows wired-OR reset bus configuration and interface with 1.8–5.5 V logic |
| MR Input | Internal 22 kΩ pull-up, VIH = 2.3 V, VIL = 0.8 V - simplifies pushbutton or FPGA-driven manual reset without external components |
| VCC Range | 1.0 V to 5.5 V - RESET remains valid during deep brown-out, supporting fail-safe shutdown sequencing |
Pinout & Package
SM72240MF-3.08/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 2.9 mm × 1.6 mm × 1.45 mm, with gull-wing leads and RoHS-compliant matte tin (Sn) lead finish. Pin 1 is located in quadrant Q3 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference and substrate connection - must be tied directly to system ground plane for noise immunity |
| 2 | GND | Second ground terminal - improves thermal dissipation and reduces ground bounce in high-noise environments |
| 3 | RESET | Active-low open-drain reset output - requires external pull-up resistor (typically 10–100 kΩ) to host logic rail |
| 4 | MR | Manual reset input - internally pulled up to VCC; asserted low for >10 µs triggers 190 ms reset pulse |
| 5 | VCC | Power supply input - accepts 1.0–5.5 V; powers internal comparators and timer; RESET valid down to 1 V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08 V threshold | Factory-trimmed to ±0.05 V over −40°C to +125°C - eliminates need for external resistor divider calibration |
| 190 ms reset timeout | Guaranteed minimum 100 ms, typical 190 ms - meets JEDEC JESD8-12E and MIL-STD-883 requirements for processor boot reliability |
| Low 7 µA supply current | Enables use in always-on solar harvesters and battery-backed controllers where quiescent power is critical |
| MR input with 22 kΩ pull-up | Reduces BOM count by eliminating external pull-up resistor in pushbutton or logic-driven reset applications |
| VCC ≥ 1 V RESET validity | Ensures deterministic reset behavior during deep undervoltage events - prevents spurious release before safe power recovery |
Applications
| Solar Microinverter Control | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors DC-link voltage in photovoltaic microinverters to detect panel shading-induced brown-out and initiate safe shutdown. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low signal to gate driver IC and MCU upon VCC drop below 3.08 V. Use Value: Prevents partial switching of power MOSFETs during unstable DC conditions, avoiding shoot-through and thermal runaway. |
Use Scenario: Provides power-on and brown-out reset for ARM Cortex-M7-based I/O controller in harsh factory-floor environments. IC Role / Device Role / Timing Role: System-level reset supervisor ensuring deterministic boot sequence after 24 VDC supply fluctuations. Use Value: Eliminates firmware lockup due to marginal VDD during EMI transients, improving MTBF in EN 61000-4-4 compliant designs. |
| Battery-Powered Data Logger | Automotive Telematics Gateway |
Use Scenario: Manages cold-start reset and low-battery detection in lithium-thionyl chloride powered environmental sensors. IC Role / Device Role / Timing Role: Dual-function supervisor using MR pin for wake-on-button and VCC monitor for end-of-life battery cutoff. Use Value: Extends usable battery life by 18 months via 7 µA quiescent draw and enables field-serviceable manual reset without soldering. |
Use Scenario: Ensures robust reset coordination between infotainment SoC and CAN transceiver during vehicle ignition cycling. IC Role / Device Role / Timing Role: Temperature-hardened reset source synchronizing power rails across multiple voltage domains (1.8 V, 3.3 V, 5 V). Use Value: Guarantees simultaneous reset release across subsystems despite 12 V battery sag to 6.5 V during cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811TEUS+T | 3.08 V threshold, but only rated −40°C to +85°C; 14 µA ICC; no MR internal pull-up | Limited to commercial-grade portable equipment; requires external MR pull-up resistor | Choose if cost sensitivity outweighs extended temperature and low-power needs |
| TPS3808G30DBVR | 3.0 V threshold (±1.5%), 1.6 µA ICC, −40°C to +125°C, but no MR pin - reset only VCC-triggered | Suitable for space-constrained designs needing ultra-low ICC, but lacks manual reset capability | Prefer when MR functionality is unnecessary and <2 µA quiescent current is mandatory |
Compared with MAX811TEUS+T, SM72240MF-3.08/NOPB offers 50% lower supply current and full automotive temperature range; versus TPS3808G30DBVR, it adds MR functionality at the cost of 4.4 µA higher ICC - making it optimal for solar and industrial systems requiring both precision reset and field-serviceable manual intervention.
Availability
SM72240MF-3.08/NOPB is available at Aetrix Electronics and suitable for solar microinverter control, industrial PLC I/O modules, and battery-powered data loggers requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for SM72240MF-3.08/NOPB 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
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, efficiency, and system-level integration.
The SM72240 product line targets renewable energy systems - specifically solar power electronics - where precision voltage monitoring, wide temperature operation, and ultra-low power consumption are essential for grid-tied and off-grid applications.
FAQ
What is the exact reset threshold voltage of the SM72240MF-3.08/NOPB?
The SM72240MF-3.08/NOPB has a factory-programmed reset threshold of 3.08 V, with guaranteed limits of 3.03 V (min) and 3.14 V (max) across −40°C to +125°C. This value is laser-trimmed during production and specified in the Electrical Characteristics table of the SNIS154C datasheet. The 3.08 V threshold is optimized for reliable supervision of nominal 3.3 V power rails, maintaining accuracy within ±1.6% over full temperature range.
Does the SM72240MF-3.08/NOPB support manual reset functionality, and how is it implemented?
Yes, the SM72240MF-3.08/NOPB supports manual reset via its MR (Manual Reset) pin (Pin 4). The MR input features an internal 22 kΩ pull-up resistor to VCC, allowing direct connection to a pushbutton switch to ground. When MR is pulled low for >10 µs, the device asserts RESET for 190 ms. No external components are required, and the input is debounced to reject glitches ≤100 ns - a feature confirmed in the Applications Information section of the SNIS154C datasheet.
What is the minimum VCC voltage at which the SM72240MF-3.08/NOPB guarantees valid RESET output?
The SM72240MF-3.08/NOPB guarantees valid RESET output down to VCC ≥ 1 V, as explicitly stated in the Features list and Electrical Characteristics table. Below 1 V, the open-drain output cannot sink rated current, risking indeterminate logic levels. For operation down to 0 V, TI recommends adding a 100 kΩ pull-down resistor from RESET to GND - a design detail documented in Figure 11 and the "ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0V" section of SNIS154C.
Is the SM72240MF-3.08/NOPB pin-compatible with standard 5-pin SOT-23 reset supervisors like the MAX811?
No, the SM72240MF-3.08/NOPB is not pin-compatible with the MAX811 family. While both use 5-pin SOT-23 packages, the SM72240MF-3.08/NOPB assigns Pins 1 and 2 to GND (dual ground), Pin 3 to RESET, Pin 4 to MR, and Pin 5 to VCC - whereas MAX811 variants place RESET on Pin 3, VCC on Pin 5, GND on Pin 1, and lack a dedicated MR pin. Layout redesign is required; however, functional equivalence exists for 3.08 V supervision with manual reset capability.
What packaging and reel specifications apply to the SM72240MF-3.08/NOPB?
The SM72240MF-3.08/NOPB ships in SOT-23 (DBV) package with matte tin (Sn) lead finish, moisture sensitivity level (MSL) 1, and peak reflow rating of 260°C. Standard reel quantity is 1000 units per 178 mm diameter, 8.4 mm wide tape with 4.0 mm pitch and Q3 pin-1 orientation. Tape dimensions follow JEDEC MO-178, and the part marking is "R133", as verified in TI's PACKAGE OPTION ADDENDUM dated 11-Nov-2025.
SM72240MF-3.08/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SolarMagic™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
SM72240MF-3.08/NOPB FAQ
1.How can I place an order for SM72240MF-3.08/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM72240MF-3.08/NOPB 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 SM72240MF-3.08/NOPB reliable?
The price and inventory of SM72240MF-3.08/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM72240MF-3.08/NOPB is usually 5 days.
3.What payment methods are accepted for SM72240MF-3.08/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72240MF-3.08/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM72240MF-3.08/NOPB?
SM72240MF-3.08/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM72240MF-3.08/NOPB 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 SM72240MF-3.08/NOPB?
For technical support, including SM72240MF-3.08/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72240MF-3.08/NOPB requirements.
6.How does Aetrix verify that SM72240MF-3.08/NOPB is sourced from the original manufacturer or authorized distributors?
All SM72240MF-3.08/NOPB 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 SM72240MF-3.08/NOPB meets industry standards.
7.What is the process for return or replacement of SM72240MF-3.08/NOPB?
All SM72240MF-3.08/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72240MF-3.08/NOPB, 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 SM72240MF-3.08/NOPB part is unused and in its original packaging.
Return procedure for SM72240MF-3.08/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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