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Texas Instruments TPS3840PH40DBVR
- Part No.:
- TPS3840PH40DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840PH40DBVR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
TPS3840PH40DBVR from Texas Instruments is a nano-power, high-input-voltage supervisor IC with push-pull active-high reset output, 4.0 V fixed threshold (±1.5% max), 300 nA typical supply current, and user-programmable reset delay up to 6.2 s via external capacitor on CT pin. It monitors 1.5–10 V rails in battery-powered safety-critical systems such as smoke detectors and smart meters.
For engineers reviewing the TPS3840PH40DBVR datasheet, TPS3840PH40DBVR pinout, TPS3840PH40DBVR application, or TPS3840PH40DBVR equivalent, key selection criteria include its 4.0 V precise threshold accuracy, 220 µs startup delay, –40°C to +125°C operation, SOT-23-5 package, and active-high push-pull RESET output topology.
Technical Context
The TPS3840PH40DBVR implements a precision bandgap-based voltage comparator with built-in hysteresis (200 mV typical for 4.0 V threshold) and glitch-immune detection logic. Its internal CT pin resistor (500 kΩ typical) forms an RC timing network with external capacitor to generate programmable reset hold time.
Reset assertion occurs when VDD falls below 4.0 V or MR is pulled low; deassertion requires VDD to rise above 4.2 V (VIT+), MR to float or exceed 0.7×VDD, and expiration of tD. Power-on-reset (VPOR = 950 mV) prevents false resets during slow-ramp power-up sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 4.0 V ±1.5% max - ensures reliable brownout detection at nominal 4.0 V rail without calibration |
| IDD Supply Current | 300 nA typical - extends battery life in multi-year portable applications |
| tSTRT Startup Delay | 220 µs typical - enables fault detection before system MCU initializes |
| tD Reset Delay Range | 50 µs (CT open) to 6.2 s (10 µF) - supports flexible system-level reset coordination |
| VHYS Hysteresis | 200 mV typical - prevents oscillatory reset toggling near threshold during noisy supply conditions |
| Operating Temp | –40°C to +125°C - qualified for industrial and grid infrastructure environments |
| Output Type | Push-pull active-high RESET - eliminates need for external pull-up resistor and reduces BOM count |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, 5-pin surface-mount, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-high push-pull output | Drives logic-high during reset; sinks current to logic-low after release - no external pull-up required |
| 2: VDD | Supply and monitored input | Accepts 1.5–10 V; powers internal circuitry and serves as voltage sense node |
| 3: GND | Reference ground | Common return path for VDD, MR, CT, and RESET; must be low-impedance for noise immunity |
| 4: MR | Manual reset input | Asserts reset when pulled ≤600 mV; floats or ≥0.7×VDD to release - compatible with 1.8/3.3/5 V GPIO |
| 5: CT | Capacitor timing input | Connects to GND via external capacitor (0–10 µF) to set reset hold time; floating for minimum 50 µs delay |
Key Features
| Feature | Design Value |
|---|---|
| Nano-quiescent current | 300 nA typical - enables >10-year battery life in coin-cell–powered IoT endpoints |
| Programmable reset delay | 50 µs to 6.2 s via single external capacitor - replaces discrete RC timers and simplifies layout |
| High-accuracy threshold | 4.0 V ±1.5% over –40°C to +125°C - eliminates need for external trimming in harsh environments |
| Glitch-immune MR and VDD inputs | 10 µs minimum pulse rejection at 5% overdrive - prevents spurious resets from ESD or switching noise |
| Wide input voltage range | 1.5 V to 10 V - monitors 3.3 V, 5 V, and 9 V rails directly without resistive dividers |
Applications
| Smart Meter Power Monitoring | Fire Alarm Smoke Detector |
|---|---|
Use Scenario: Monitors backup battery and main AC-derived 5 V rail during power loss events to trigger secure shutdown and tamper logging. IC Role / Device Role / Timing Role: Supervisor IC asserting active-high RESET to microcontroller upon undervoltage, with 200 ms programmable hold time to complete EEPROM write. Use Value: Prevents data corruption during brownout by guaranteeing MCU remains held in reset until stable power returns and nonvolatile storage completes. |
Use Scenario: Ensures reliable wake-up and self-test sequence in battery-operated photoelectric smoke sensors with 10-year shelf life. IC Role / Device Role / Timing Role: Nano-power supervisor enabling ultra-low sleep current; asserts RESET at 4.0 V to initiate periodic sensor calibration and alarm readiness check. Use Value: Extends battery lifetime beyond 10 years while maintaining certified fault-detection response time per UL 217. |
| Industrial PLC Field Transmitter | Electronic Point-of-Sale Terminal |
Use Scenario: Protects 4–20 mA loop-powered transmitter from supply dips caused by cable faults or EMI in factory automation settings. IC Role / Device Role / Timing Role: High-voltage supervisor monitoring 24 V loop supply; uses CT pin to set 500 ms reset hold ensuring analog front-end stabilizes before ADC sampling resumes. Use Value: Eliminates transient-induced measurement errors and communication lockups without adding external timing components. |
Use Scenario: Provides controlled power sequencing for ARM-based POS terminals using dual 3.3 V and 5 V rails from USB-C PD source. IC Role / Device Role / Timing Role: Dual-rail supervisor with MR pin tied to host processor to force coordinated reboot during firmware update or thermal shutdown. Use Value: Guarantees atomic state transition across CPU, display, and payment module - preventing partial boot failures and PCI compliance violations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL40DBVR | Push-pull active-low RESET output; identical threshold, timing, and quiescent current | Requires host logic to interpret active-low signal; may necessitate level-shifting in 1.8 V systems | Select when interfacing with legacy MCUs expecting active-low reset or when sharing pull-up resources across multiple peripherals |
| MAX6374US40+T | Fixed 4.0 V threshold, 1.6 µA IDD, 200 ms factory-fixed delay, SOT23-5 | Lacks programmable delay and manual reset; higher supply current limits battery life | Choose only if design requires zero external components and accepts fixed timing - not suitable for adaptive reset coordination |
Compared with TPS3840PH40DBVR, the PL40 variant offers identical supervision accuracy and ultra-low power but demands active-low logic compatibility, whereas MAX6374US40+T sacrifices programmability and nano-power operation for simpler integration in line-powered applications.
Availability
TPS3840PH40DBVR is available at Aetrix Electronics and suitable for smart meter power monitoring, fire alarm smoke detectors, industrial PLC field transmitters, electronic point-of-sale terminals, and portable battery-powered systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TPS3840PH40DBVR 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 over 90 years of innovation in power management, signal chain, and real-time control ICs.
The TPS3840 family was designed specifically for ultra-low-power, high-voltage supervision in safety-critical industrial and infrastructure applications where precision, longevity, and reliability are non-negotiable.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840PH40DBVR?
The TPS3840PH40DBVR has a factory-trimmed negative-going input threshold (VIT−) of 4.0 V with ±1.5% maximum deviation over –40°C to +125°C and 1% typical accuracy. This value is fixed and unadjustable, verified per TI's production test flow and documented in Section 6.5 of the SNVSB03E datasheet.
How does the CT pin function in the TPS3840PH40DBVR?
The CT pin on the TPS3840PH40DBVR connects to an internal 500 kΩ resistor (typical); attaching an external capacitor to GND sets the reset time delay (tD) from 50 µs (pin floating) up to 6.2 s (10 µF). The relationship follows tD = 618937 × CCT_EXT + 50 µs, as derived from TI's Equation 4 in Section 7.3.2.
Can the TPS3840PH40DBVR monitor a 9 V battery directly?
Yes - the TPS3840PH40DBVR supports 1.5 V to 10 V input on VDD, enabling direct monitoring of 9 V alkaline or lithium batteries without external resistive dividers. Its 4.0 V threshold triggers reset before critical brownout, preserving system integrity during gradual discharge.
What is the reset output behavior of the TPS3840PH40DBVR?
The TPS3840PH40DBVR features a push-pull active-high RESET output: it drives logic-high during reset assertion and actively pulls low after release. This eliminates reliance on external pull-up resistors, reduces leakage paths, and ensures clean, fast transitions compatible with modern low-voltage MCUs.
Does the TPS3840PH40DBVR include built-in hysteresis, and how much?
Yes - the TPS3840PH40DBVR includes factory-set hysteresis of 200 mV typical (175–225 mV min/max) for VIT− thresholds between 3.1 V and 4.9 V. For the 4.0 V variant, this yields VIT+ ≈ 4.2 V, preventing chatter during slow-rising or noisy supply conditions near the trip point.
TPS3840PH40DBVR 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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 619ms Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3840PH40DBVR FAQ
1.How can I place an order for TPS3840PH40DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840PH40DBVR 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 TPS3840PH40DBVR reliable?
The price and inventory of TPS3840PH40DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840PH40DBVR is usually 5 days.
3.What payment methods are accepted for TPS3840PH40DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3840PH40DBVR transactions.
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4.How is shipping managed for TPS3840PH40DBVR?
TPS3840PH40DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840PH40DBVR 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 TPS3840PH40DBVR?
For technical support, including TPS3840PH40DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840PH40DBVR requirements.
6.How does Aetrix verify that TPS3840PH40DBVR is sourced from the original manufacturer or authorized distributors?
All TPS3840PH40DBVR 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 TPS3840PH40DBVR meets industry standards.
7.What is the process for return or replacement of TPS3840PH40DBVR?
All TPS3840PH40DBVR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840PH40DBVR, 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 TPS3840PH40DBVR part is unused and in its original packaging.
Return procedure for TPS3840PH40DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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