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Texas Instruments TPS3840PL43DBVR
- Part No.:
- TPS3840PL43DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PL43DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,480
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Product details
Overview
TPS3840PL43DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-low reset output, 4.3V fixed threshold (±1.5% max), 300nA typical supply current, and programmable reset delay up to 6.2s via external capacitor on CT pin. It monitors power rails in battery-powered and industrial systems where ultra-low quiescent current and precise voltage supervision are critical.
For engineers reviewing the TPS3840PL43DBVR datasheet, TPS3840PL43DBVR pinout, TPS3840PL43DBVR application, or TPS3840PL43DBVR equivalent, key selection considerations include its 1.5V–10V operating range, 220µs typical startup delay, built-in hysteresis (200mV typ. for 4.3V threshold), MR input compatibility with logic-level GPIOs, and SOT-23-5 package constraints for space-constrained PCB layouts.
Technical Context
The TPS3840PL43DBVR implements a precision bandgap-referenced comparator with internal hysteresis to prevent chatter during VDD transitions near the 4.3V threshold. Its reset assertion is triggered by either VDD falling below VIT− (4.3V) or manual pull-down of the MR pin, with deassertion delayed by a user-programmable tD after VDD rises above VIT+ (4.5V).
Reset timing is governed by an internal RC network tied to the CT pin: RCT ≈ 500kΩ (typ.) interacts with external capacitance to generate delays from 50µs (CT floating) to 6.2s (10µF). The push-pull output drives RESET low with VOL ≤ 200mV at 2mA sink, eliminating need for external pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 10V - enables direct monitoring of 3.3V, 5V, 9V battery rails without level-shifting or external dividers |
| Threshold Voltage (VIT−) | 4.3V ±1.5% max - factory-trimmed fixed threshold with 200mV typical hysteresis for stable release point at 4.5V |
| Quiescent Current (IDD) | 300nA typical, 700nA max - extends battery life in always-on IoT sensors and portable medical devices |
| Startup Delay (tSTRT) | 220µs typical - ensures reliable fault detection before system MCU initializes during power-up |
| Reset Delay Range (tD) | 50µs (CT open) to 6.2s (10µF) - supports flexible system-level reset coordination across diverse firmware boot sequences |
| Output Type | Push-pull active-low - provides rail-to-rail drive capability without external pull-up, reducing BOM count and layout area |
| Operating Temperature | –40°C to +125°C - qualified for use in automotive under-hood, industrial PLC, and grid infrastructure environments |
Pinout & Package
SOT-23-5 (DBV) package: 2.90mm × 1.60mm footprint, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives low (≤200mV @ 2mA) during reset; releases high (≥0.8×VDD) after tD expires - no external pull-up required |
| 2: VDD | Power supply and monitored rail input | Supplies internal circuitry while simultaneously being supervised; accepts 1.5–10V directly |
| 3: GND | Analog and digital ground reference | Common return path for internal comparator, bandgap, and output stage; must be low-impedance |
| 4: MR | Manual reset input | Asserts reset when pulled ≤600mV; internally pulled up to ~100kΩ; compatible with 1.8V/3.3V GPIOs |
| 5: CT | Capacitor time-delay programming node | Connects to GND via external capacitor (0–10µF) to set tD; floating = minimum 50µs delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-power operation | 300nA typical IDD enables >10-year battery life in coin-cell–powered smoke detectors and remote sensors |
| Factory-trimmed 4.3V threshold | ±1.5% max accuracy over –40°C to +125°C eliminates need for external calibration in industrial field transmitters |
| Programmable reset delay | Single external capacitor sets tD from 50µs to 6.2s - replaces discrete RC networks and simplifies firmware timing dependencies |
| Glitch-immune MR and VDD inputs | 10µs minimum pulse rejection on MR and 5% overdrive immunity on VDD prevent spurious resets in electrically noisy factory automation environments |
| Wide temperature range | Specified performance from –40°C to +125°C supports deployment in HVAC controllers and smart metering without derating |
Applications
| Smart Meter Power Supervision | Portable Medical Sensor |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 9V backup battery in ANSI C12.20–compliant electricity meters during brownout and battery-switchover events. IC Role / Device Role / Timing Role: Supervisor asserts RESET if VDD drops below 4.3V or MR is pulsed during firmware update; tD = 200ms ensures full MCU reset before reinitialization. Use Value: Prevents corrupted flash writes and state machine lockup during grid instability, meeting IEC 62053-21 reliability requirements. | Use Scenario: Powers continuous glucose monitor (CGM) with CR2032 coin cell; supervises LDO output feeding BLE SoC and analog front-end. IC Role / Device Role / Timing Role: Detects LDO dropout at 4.3V; holds RESET low until VDD recovers and tD (100ms) expires - guarantees clean SoC boot after wake-from-sleep. Use Value: 300nA IDD extends single-cell runtime beyond 18 months; push-pull output reduces standby current vs. open-drain alternatives requiring pull-ups. |
| Industrial PLC I/O Module | Fire Alarm Control Panel |
Use Scenario: Embedded in DIN-rail-mounted I/O module; supervises 24V DC input (via resistor divider) and 5V logic rail powering isolated CAN transceivers and ADCs. IC Role / Device Role / Timing Role: TPS3840PL43DBVR monitors divided 24V rail (scaled to 4.3V); MR pin linked to watchdog timer for fail-safe shutdown on firmware hang. Use Value: 10V absolute max rating allows safe operation with 24V input + transients; –40°C to +125°C rating ensures reliability in uncooled enclosures. | Use Scenario: Used in addressable fire alarm control panel to supervise 24V notification appliance circuit (NAC) power and 5V microcontroller supply. IC Role / Device Role / Timing Role: Asserts RESET on NAC undervoltage (via resistor divider) or manual test button press (MR); tD = 1s prevents nuisance alarms during brief line dips. Use Value: Built-in hysteresis (200mV) avoids oscillation during marginal 24V conditions; UL-listed thermal performance supports Class A fire system certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL42DBVR | 4.2V threshold (vs. 4.3V); identical package, pinout, and electrical specs otherwise | Used where tighter margin below 4.3V rail is needed - e.g., 4.5V LDO with 200mV dropout | Select when system VDD nominal is 4.5V and supervision must trigger before LDO regulation fails |
| MAX6373US43+T | 4.3V threshold, 1.2µA max IDD (vs. 700nA), SOT23-5, no MR pin, fixed 200ms tD | Lacks manual reset and programmable delay; higher IQ limits battery life in multi-year deployments | Choose only if MR functionality and ultra-low IQ are not required - e.g., mains-powered HVAC controller |
Compared with TPS3840PL43DBVR, the TPS3840PL42DBVR offers a 0.1V lower trip point for finer-grained supervision of 4.5V rails, while the MAX6373US43+T trades nano-power operation and MR flexibility for simpler fixed-delay implementation in cost-sensitive, non-battery applications.
Availability
TPS3840PL43DBVR is available at Aetrix Electronics and suitable for smart metering, portable medical sensing, industrial PLC modules, fire safety systems, and battery-backed IoT edge nodes requiring stable component supply across extended product lifecycles.
Supply support for TPS3840PL43DBVR 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 and embedded processing solutions, with deep expertise in power management, signal chain, and high-reliability industrial ICs.
The TPS3840 family was designed specifically for ultra-low-power voltage supervision in battery-critical and harsh-environment applications, emphasizing nanoscale quiescent current, wide input voltage tolerance, and robust glitch immunity.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PL43DBVR?
The TPS3840PL43DBVR has a factory-set negative-going input threshold (VIT−) of 4.3V with ±1.5% maximum accuracy over –40°C to +125°C and 1% typical accuracy at 25°C. Hysteresis is 200mV typical, resulting in a VIT+ release point of 4.5V. This is confirmed in Section 6.5 of the TI datasheet SNVSB03E.
Can the TPS3840PL43DBVR monitor a 24V rail directly?
No - the TPS3840PL43DBVR absolute maximum VDD rating is 12V. To supervise a 24V rail, use a resistor divider to scale the voltage down to ≤10V at the VDD pin, ensuring the divided voltage equals 4.3V at the intended trip point. The datasheet confirms this method in the "Description" section and Figure 8-1.
How does the CT pin affect reset timing in the TPS3840PL43DBVR?
The CT pin sets the reset time delay (tD) via an external capacitor to GND. With CT floating, tD = 50µs (minimum); with 10µF, tD ≈ 6.2s (maximum). The internal CT resistance is 500kΩ typical, and tD follows tD = 618937 × CCT_EXT + 50µs per Equation 4 in the datasheet. This relationship is validated across temperature in Figure 6-36.
Is the MR pin of the TPS3840PL43DBVR compatible with 1.8V logic?
Yes - the MR pin logic-low threshold (VMR_L) is 600mV maximum, and its internal pull-up is ~100kΩ. A 1.8V GPIO can reliably assert reset by driving MR ≤600mV; no level shifter is needed. This is specified in Table 6-5 and verified in Figure 6-27 of the TPS3840PL43DBVR datasheet.
What is the maximum load the TPS3840PL43DBVR RESET pin can drive?
The TPS3840PL43DBVR RESET pin (push-pull active-low) sinks up to 2mA while maintaining VOL ≤ 200mV at VDD = 1.5–5V, and 5mA at VDD = 5–10V. It sources up to 2mA (VOH ≥ 0.8×VDD) when released. These values are specified in Section 6.5 Electrical Characteristics and validated in Figures 6-18 and 6-22.
TPS3840PL43DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 619ms Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3840PL43DBVR FAQ
1.How can I place an order for TPS3840PL43DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PL43DBVR 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 TPS3840PL43DBVR reliable?
The price and inventory of TPS3840PL43DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PL43DBVR is usually 5 days.
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Once your TPS3840PL43DBVR 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 TPS3840PL43DBVR?
For technical support, including TPS3840PL43DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PL43DBVR requirements.
6.How does Aetrix verify that TPS3840PL43DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PL43DBVR 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 TPS3840PL43DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PL43DBVR?
All TPS3840PL43DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PL43DBVR, 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 TPS3840PL43DBVR part is unused and in its original packaging.
Return procedure for TPS3840PL43DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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