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Texas Instruments TPS3840DL28DBVRQ1
- Part No.:
- TPS3840DL28DBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TPS3840DL28DBVRQ1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,039
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Product details
Overview
TPS3840DL28DBVRQ1 from Texas Instruments is an automotive-grade nano-power voltage supervisor IC with open-drain active-low reset output, 2.8 V fixed threshold (±1.5% max), 350 nA typical quiescent current, and programmable capacitor-based reset delay up to 6.2 s - used for reliable power-on reset and brownout detection in automotive infotainment and ADAS domain controllers.
For engineers reviewing the TPS3840DL28DBVRQ1 datasheet, TPS3840DL28DBVRQ1 pinout, TPS3840DL28DBVRQ1 application, or TPS3840DL28DBVRQ1 equivalent, this page delivers verified electrical specifications, validated SOT-23-5 pin functions, automotive AEC-Q100 Grade 1 qualification status, and real-world timing behavior including tP_HL = 30 µs (typ) and tSTRT ≤ 350 µs.
Technical Context
The TPS3840DL28DBVRQ1 implements a precision bandgap reference and comparator with built-in hysteresis (100 mV typ for 2.8 V threshold) to prevent false resets during supply transients. Its internal CT pin circuitry features a 500 kΩ (typ) pull-down resistance enabling accurate RC-based delay programming across temperature.
It operates over 1.5 V–10 V supply range with glitch immunity on VDD (10 µs minimum pulse rejection at 5% overdrive) and MR inputs, and supports manual reset assertion via logic-low signal on MR pin - with VMRL = 600 mV (max) and internal 100 kΩ pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT− Threshold | 2.8 V ±1.5% (max) - ensures precise brownout detection at core rail level without external resistive divider |
| IDD Quiescent Current | 350 nA (typ), 700 nA (max) - enables multi-year battery operation in always-on automotive modules |
| tP_HL Propagation Delay | 30 µs (typ) - guarantees fast response to supply collapse before MCU state corruption occurs |
| tSTRT Startup Delay | ≤350 µs - allows stable power ramp before reset release, compatible with fast-ramping DC/DC converters |
| tD Reset Delay Range | 50 µs (no cap) to 6.2 s (10 µF) - supports flexible system-level boot sequencing and watchdog timeout alignment |
| Hysteresis (VHYS) | 100 mV (typ) - prevents chatter during slow-rising/falling VDD transitions near 2.8 V |
| Output Type | Open-drain active-low RESET - enables wired-OR reset bus and flexible pull-up voltage selection (e.g., 1.8 V, 3.3 V, 5 V) |
Pinout & Package
TPS3840DL28DBVRQ1 uses the industry-standard 5-pin SOT-23 (DBV) package (2.90 mm × 1.60 mm), optimized for space-constrained automotive PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low output | Drives low during reset assertion; requires external pull-up; sinks ≥2 mA at VOL ≤ 200 mV |
| 2 - VDD | Supply and monitored input | Input voltage range 1.5 V–10 V; powers internal circuitry and serves as monitored rail |
| 3 - GND | Ground reference | Common return path for internal comparator, reference, and output stage |
| 4 - MR | Manual reset input | Active-low control: logic low ≤600 mV asserts reset; internally pulled up to VDD (100 kΩ) |
| 5 - CT | Capacitor time-delay input | Connect external capacitor to GND to program tD; floating = minimal 50 µs delay; RCT = 500 kΩ (typ) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Rated for –40°C to +125°C ambient operation - suitable for under-hood and cockpit electronics without derating |
| Programmable reset delay | Full 50 µs–6.2 s range via single external capacitor - eliminates need for external timers or microcontroller intervention |
| Glitch-immune VDD monitoring | Rejects transients <10 µs at 5% overdrive - prevents spurious resets in noisy automotive power domains |
| Low leakage open-drain output | ILKG(OD) ≤ 90 nA at 5.5 V - preserves signal integrity on shared reset buses with minimal loading |
| Power-on reset (VPOR) | 300 mV (min) - ensures defined output state during ultra-slow VDD ramps (e.g., energy harvesting systems) |
Applications
| Automotive Head Unit Power Sequencing | ADAS Domain Controller Brownout Protection |
|---|---|
Use Scenario: Monitors 3.3 V I/O rail in head unit SoC design where multiple voltage rails power up asynchronously. IC Role / Device Role / Timing Role: Voltage supervisor asserting open-drain RESET until 3.3 V stabilizes above 2.8 V and remains valid for programmed tD. Use Value: Prevents firmware execution before I/O rail meets timing margin, eliminating boot failures due to marginal VDD rise time. |
Use Scenario: Protects radar/Ethernet domain controller during engine cranking when 12 V battery dips to 6 V causing intermediate DC/DC outputs to sag. IC Role / Device Role / Timing Role: Detects 2.8 V core rail collapse and holds RESET low for 200 ms (via 100 nF CT) to guarantee full processor shutdown/restart. Use Value: Avoids partial state corruption in safety-critical ADAS processors by enforcing clean reset during transient brownouts. |
| Telematics Emergency Call (eCall) Module | Automotive Display Cluster Power Management |
Use Scenario: Ensures eCall module remains fully reset during vehicle ignition-off-to-on transition where backup battery may cause erratic VDD behavior. IC Role / Device Role / Timing Role: Uses MR pin to synchronize reset release with main MCU wake-up signal; CT pin set for 500 ms delay to align with modem initialization. Use Value: Guarantees deterministic modem boot sequence independent of backup supply fluctuations, meeting UNECE R155 functional safety requirements. |
Use Scenario: Supervises 1.8 V display interface rail in digital instrument cluster where GPU and display driver ICs require strict power-up order. IC Role / Device Role / Timing Role: Generates delayed RESET after 1.8 V reaches 2.8 V threshold, allowing analog front-end to stabilize before digital handshake begins. Use Value: Eliminates display artifacts and I²C bus lockups caused by premature GPU access to uninitialized display IC registers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3840PL28DBVRQ1 | Push-pull active-low output (not open-drain); no external pull-up required; higher output drive (2 mA sink/source) | Suitable where board space prohibits pull-up resistor or where RESET must drive multiple loads directly | Select when system lacks pull-up infrastructure or requires stronger RESET drive without added components |
| MAX6375XR28+T | Fixed 2.8 V threshold, 1.6 µA quiescent current, no MR pin, 200 ms factory-fixed delay | Lacks programmable delay and manual reset - limited to simple single-rail supervision with fixed timing | Choose only for cost-sensitive non-automotive designs where flexibility is unnecessary and higher IQ is acceptable |
Compared with TPS3840PL28DBVRQ1, the TPS3840DL28DBVRQ1 offers wiring flexibility and bus-sharing capability via open-drain architecture; compared with MAX6375XR28+T, it provides AEC-Q100 qualification, 5× lower IQ, and field-programmable delay - critical for modern automotive ECU architectures.
Availability
TPS3840DL28DBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, ADAS domain controllers, and telematics modules requiring stable component supply with full AEC-Q100 compliance and long-term production support.
Supply support for TPS3840DL28DBVRQ1 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 company delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.
The TPS3840-Q1 product line was designed specifically for automotive power-supply monitoring - combining ultra-low IQ, high accuracy, and robust transient immunity to meet ASIL-B supporting requirements in safety-critical ECUs.
FAQ
What is the exact threshold voltage and accuracy of the TPS3840DL28DBVRQ1?
The TPS3840DL28DBVRQ1 has a factory-trimmed negative-going input threshold (VIT−) of 2.8 V with ±1.5% maximum deviation across –40°C to +125°C ambient temperature. Typical accuracy is ±1%, and hysteresis is 100 mV (typical), ensuring stable reset release without oscillation near the trip point. This specification is confirmed in Section 7.5 of the official TI datasheet SNVSBA1B.
Does the TPS3840DL28DBVRQ1 support manual reset functionality?
Yes, the TPS3840DL28DBVRQ1 includes an active-low manual reset (MR) input (Pin 4). Driving MR to ≤600 mV asserts RESET regardless of VDD level. The MR pin features an internal 100 kΩ pull-up to VDD, allowing it to float when unused. Release timing follows the programmed tD delay after MR returns high, as documented in Section 7.6 timing tables.
How is reset delay programmed on the TPS3840DL28DBVRQ1?
Reset delay (tD) on the TPS3840DL28DBVRQ1 is programmed by connecting an external capacitor between the CT pin (Pin 5) and GND. With no capacitor, tD = 50 µs; with 10 µF, tD ≈ 6.2 s. The relationship follows tD = −ln(0.29) × RCT × CCT_EXT + 50 µs, where RCT = 500 kΩ (typ). This is specified in Section 8.3.2 and Figure 39 of the datasheet.
What package and footprint does the TPS3840DL28DBVRQ1 use?
The TPS3840DL28DBVRQ1 uses the SOT-23-5 (DBV) package with nominal body dimensions of 2.90 mm × 1.60 mm and 0.95 mm height. It is RoHS-compliant, lead-free, and qualified for reflow soldering per JEDEC J-STD-020. Pin 1 (RESET) is marked by a dot; pin order matches standard DBV top-view orientation shown in Figure 4 of SNVSBA1B.
Is the TPS3840DL28DBVRQ1 qualified for automotive applications?
Yes, the TPS3840DL28DBVRQ1 is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), with HBM ESD rating of ±2000 V and CDM rating of ±750 V. It meets automotive reliability, thermal, and stress test requirements as stated in Section 1 of the SNVSBA1B datasheet and is approved for use in safety-related systems up to ASIL-B supporting level.
TPS3840DL28DBVRQ1 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:
- 2.8V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 619ms Typical
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TPS3840DL28DBVRQ1 FAQ
1.How can I place an order for TPS3840DL28DBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3840DL28DBVRQ1 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 TPS3840DL28DBVRQ1 reliable?
The price and inventory of TPS3840DL28DBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3840DL28DBVRQ1 is usually 5 days.
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TPS3840DL28DBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3840DL28DBVRQ1 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 TPS3840DL28DBVRQ1?
For technical support, including TPS3840DL28DBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3840DL28DBVRQ1 requirements.
6.How does Aetrix verify that TPS3840DL28DBVRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS3840DL28DBVRQ1 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 TPS3840DL28DBVRQ1 meets industry standards.
7.What is the process for return or replacement of TPS3840DL28DBVRQ1?
All TPS3840DL28DBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS3840DL28DBVRQ1, 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 TPS3840DL28DBVRQ1 part is unused and in its original packaging.
Return procedure for TPS3840DL28DBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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