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Texas Instruments TPS3840
- Part No.:
- TPS3840
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
TPS3840.pdf
- Description:
- NANOPOWER HIGH-INPUT VOLTAGE SUP
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
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Product details
Overview
TPS3840 from Texas Instruments is a nano-power, high-input-voltage supervisor IC with manual reset (MR) and user-programmable reset delay. It monitors supply rails from 1.5 V to 10 V, delivers ±1.5% threshold accuracy, features 300 nA typical quiescent current, and supports SOT-23-5 packaging for space-constrained battery-powered systems.
For engineers reviewing the TPS3840 datasheet, TPS3840 pinout, TPS3840 application, or TPS3840 equivalent, this page provides verified technical context, pin-level circuit roles, real-world timing behavior (tSTRT = 220 µs typ., tD programmable up to 6.2 s), output topology variants (DL/PL/PH), and validated alternative options for voltage monitoring in safety-critical power-up sequences.
Technical Context
The TPS3840 integrates a precision bandgap reference, hysteresis-enabled comparator, glitch-immune MR input, and CT-pin-based RC timing network to generate a controlled reset assertion window. Its internal RCT (~500 kΩ) and fixed tD(no cap) = 50 µs enable predictable delay scaling via external capacitor (CCT_EXT), per tD = 618937 × CCT_EXT + 50 µs.
VDD monitoring operates with built-in hysteresis (100 mV or 200 mV depending on VIT−), VPOR-controlled power-on-reset behavior (300 mV for PL/DL, 950 mV for PH), and transient immunity up to 10 µs at 5% overdrive. Output release requires both VDD > VIT+ and expiration of tD after MR deassertion or VDD recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 10 V - enables direct monitoring of 9 V batteries or 24 V rails (with external divider), eliminating level-shifting components. |
| Nano Quiescent Current | 300 nA typical, 700 nA max - extends battery life in always-on IoT sensors and portable medical devices. |
| Threshold Accuracy | ±1.5% max over –40°C to +125°C - ensures reliable brownout detection across industrial temperature ranges without calibration. |
| Startup Delay (tSTRT) | 220 µs typical, 350 µs max - asserts reset before system MCU initializes, preventing unsafe startup under marginal VDD. |
| Programmable Reset Delay (tD) | 50 µs (no cap) to 6.2 s (10 µF) - allows precise tailoring of reset hold time for diverse processor POR requirements. |
| Hysteresis (VHYS) | 100 mV (VIT− ≤ 3.0 V) or 200 mV (VIT− ≥ 3.1 V) - prevents chatter during slow-rising/falling supply transitions. |
| Operating Temperature | –40°C to +125°C - qualified for use in grid infrastructure, automotive under-hood, and factory automation environments. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm footprint, industry-standard 5-pin surface-mount outline compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 2) | Supply Input & Monitoring Node | Primary rail monitored by internal comparator; also powers internal logic - requires local 0.1–1 µF bypass capacitor. |
| GND (Pin 3) | Reference Ground | Common return path for VDD, MR, CT, and RESET; must be low-impedance to ensure accurate threshold detection. |
| RESET (Pin 1) | Reset Output Signal | Active-low open-drain (DL), active-low push-pull (PL), or active-high push-pull (PH) - dictates external pull-up need and load drive capability. |
| MR (Pin 4) | Manual Reset Input | Asynchronous reset trigger: logic low ≥300 ns initiates reset; floating or >0.7×VDD releases control to VDD monitoring. |
| CT (Pin 5) | Capacitor Timing Terminal | Connects to GND via external capacitor (0–10 µF) to set tD; floating for minimum 50 µs delay - internal RCT ≈ 500 kΩ defines time constant. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Voltage Range | 1.5 V to 10 V operation eliminates external regulators or dividers for 3.3 V, 5 V, and 9 V battery systems. |
| Nano-Power Consumption | 300 nA typical IDD enables multi-year battery life in wireless sensor nodes and smoke detectors. |
| User-Programmable Reset Delay | tD scales linearly with CT capacitor (50 µs to 6.2 s), enabling one BOM item to serve multiple microcontroller POR timing needs. |
| Glitch-Immune MR and VDD Inputs | 10 µs immunity at 5% overdrive prevents false resets from ESD or switching noise on supply or control lines. |
| Factory-Set Threshold Options | VIT− fixed from 1.6 V to 4.9 V in 0.1 V steps (e.g., TPS3840DL49 = 4.9 V) - avoids trimming resistors and layout variability. |
Applications
| Grid Infrastructure Monitoring | Factory Automation Transmitters |
|---|---|
|
Use Scenario: Real-time voltage supervision in smart meter auxiliary power supplies and circuit breaker control modules. IC Role / Device Role / Timing Role: Monitors 9 V backup battery or 24 V DC bus; asserts reset if VDD drops below 3.3 V threshold during grid fault. Use Value: Prevents corrupted firmware execution during brownout events using verified 1% threshold accuracy and 220 µs startup delay. |
Use Scenario: Power sequencing and fault recovery in 4–20 mA field transmitters operating in hazardous industrial zones. IC Role / Device Role / Timing Role: Supervises isolated DC-DC converter output; holds MCU in reset until stable 5 V rail is confirmed for 100 ms (via 100 nF CT). Use Value: Ensures deterministic boot after power interruption using programmable tD and –40°C to +125°C guaranteed operation. |
| Building HVAC Controllers | Portable Medical Sensors |
|
Use Scenario: Reliable reset generation in HVAC zone controllers powered by rechargeable Li-ion packs (3.0–4.2 V range). IC Role / Device Role / Timing Role: Detects undervoltage during battery discharge; triggers system shutdown before data loss occurs at 3.0 V threshold. Use Value: Leverages 300 nA IDD and 100 mV hysteresis to avoid oscillation near cutoff voltage while minimizing self-discharge. |
Use Scenario: Low-power supervisory function in wearable ECG patches requiring multi-year shelf life and instant wake-on-fault. IC Role / Device Role / Timing Role: Monitors coin-cell supply (1.5–3.0 V); asserts active-low reset to ultra-low-power MCU when voltage falls below 1.8 V. Use Value: Achieves 10-year battery life using nano-Iq and eliminates external timing components via integrated CT pin RC network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+ | Fixed 2.93 V threshold, 1.6 µA ICC, SOT-23-3 package, no MR or CT pin | Lacks manual reset and programmable delay; suited only for simple fixed-threshold monitoring | Select when minimal BOM count and cost priority outweigh delay flexibility and MR control. |
| TLV809E29DBZR | 2.93 V threshold, 450 nA ICC, SOT-23-3, push-pull active-low, no MR or CT | No manual reset input or delay programming; lower accuracy (±2.5%) and narrower 1.6–6 V VDD range | Choose for basic reset-only functions where board space is critical and timing control is unnecessary. |
Compared with MAX6326US29D3+ and TLV809E29DBZR, the TPS3840 provides unique integration of nano-power operation, factory-set precision thresholds, MR input, and fully programmable reset delay - enabling single-chip solutions for complex power sequencing in battery-sensitive and safety-critical systems.
Availability
TPS3840 is available at Aetrix Electronics and suitable for grid infrastructure monitoring, factory automation transmitters, and portable medical sensors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS3840 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability industrial and automotive ICs.
The TPS3840 belongs to TI's precision voltage supervisor product line, designed specifically for ultra-low-power, wide-input-voltage monitoring in battery-backed, safety-critical, and thermally demanding applications.
FAQ
What is the absolute maximum VDD rating for the TPS3840?
The TPS3840 has an absolute maximum VDD rating of 12 V, as specified in Section 6.1 of the official datasheet. Operation beyond this voltage may cause permanent damage. For reliable functionality, VDD must remain within the recommended operating range of 1.5 V to 10 V. The TPS3840 is rated for continuous operation at 10 V, making it suitable for direct monitoring of 9 V battery systems without external attenuation.
How does the CT pin affect reset timing in the TPS3840?
The CT pin sets the reset time delay (tD) via an external capacitor to GND. With no capacitor, tD = 50 µs; with a 10 µF capacitor, tD ≈ 6.2 s. The relationship follows tD = 618937 × CCT_EXT + 50 µs, based on internal RCT ≈ 500 kΩ. The TPS3840 uses this RC network to provide precise, user-adjustable hold time - a key differentiator versus fixed-delay supervisors. This behavior is validated across –40°C to +125°C.
What output topologies are available for the TPS3840 family?
The TPS3840 offers three factory-configured output topologies: TPS3840DL (open-drain, active-low), TPS3840PL (push-pull, active-low), and TPS3840PH (push-pull, active-high). The suffix (DL/PL/PH) defines output structure and logic polarity - DL requires an external pull-up resistor, while PL and PH drive both logic states actively. All variants share identical VDD monitoring, MR, and CT functionality.
Does the TPS3840 support manual reset functionality, and how is it implemented?
Yes, the TPS3840 includes a dedicated MR (manual reset) input (Pin 4). Pulling MR low for ≥300 ns forces immediate reset assertion regardless of VDD level. When MR is floating or held above VMR_H (≥0.7×VDD), reset release depends solely on VDD recovery and tD expiration. Internal MR pull-up (100 kΩ) allows MR to be left unconnected when unused - a verified design feature confirmed in Table 5-1 and Section 7.3.3.
What is the guaranteed threshold accuracy of the TPS3840 over temperature?
The TPS3840 guarantees ±1.5% threshold accuracy over the full operating temperature range of –40°C to +125°C, with ±1% typical performance. This specification applies to all factory-set VIT− options (1.6 V to 4.9 V) and is measured under defined test conditions per Section 6.5. Accuracy is maintained independent of VDD slew rate (≤100 mV/µs) and includes built-in hysteresis to prevent chatter during slow transitions.
TPS3840 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
TPS3840 FAQ
1.How can I place an order for TPS3840 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840 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 TPS3840 reliable?
The price and inventory of TPS3840 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840 is usually 5 days.
3.What payment methods are accepted for TPS3840?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3840 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3840?
TPS3840 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840 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 TPS3840?
For technical support, including TPS3840 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840 requirements.
6.How does Aetrix verify that TPS3840 is sourced from the original manufacturer or authorized distributors?
All TPS3840 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 TPS3840 meets industry standards.
7.What is the process for return or replacement of TPS3840?
All TPS3840 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840, 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 TPS3840 part is unused and in its original packaging.
Return procedure for TPS3840:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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