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Texas Instruments 2U3837E18QDBVRG4Q1
- Part No.:
- 2U3837E18QDBVRG4Q1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
2U3837E18QDBVRG4Q1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,379
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Product details
Overview
2U3837E18QDBVRG4Q1 from Texas Instruments is an automotive-grade nanosupervisory circuit with active-high push-pull RESET output, 1.71 V precision reset threshold, 220 nA typical supply current, and selectable 10 ms / 200 ms power-on reset delay. It monitors 1.8 V supply rails in battery-powered automotive microcontrollers and low-power DSPs.
For engineers reviewing the 2U3837E18QDBVRG4Q1 datasheet, 2U3837E18QDBVRG4Q1 pinout, 2U3837E18QDBVRG4Q1 application, or 2U3837E18QDBVRG4Q1 equivalent, this page delivers verified functional identity, validated SOT-23-5 pin mapping, confirmed automotive temperature range (−40°C to 125°C), and two rigorously cross-checked alternative parts for system-level reset design.
Technical Context
The 2U3837E18QDBVRG4Q1 implements a bandgap-referenced voltage comparator with internal hysteresis (40 mV) and a refresh timer controlling RESET assertion timing. Its CT pin selects between 10 ms (CT = GND) and 200 ms (CT = VDD) delay after VDD exceeds VIT.
It features manual reset (MR) input with internal 30 kΩ pullup, operates down to 1.6 V supply, and maintains guaranteed reset assertion until VDD rises above 1.71 V ±3% with 40 mV hysteresis. The active-high push-pull output drives loads up to 2 mA with VOH ≥ 0.8 × VDD and VOL ≤ 0.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 1.71 V ±3% - precise detection of 1.8 V rail undervoltage, enabling reliable boot sequencing |
| Supply Current | 220 nA typical at VDD > VIT - enables multi-year operation in coin-cell–powered automotive sensors |
| Reset Delay Options | 10 ms (CT = GND) or 200 ms (CT = VDD) - configurable timing for diverse processor initialization requirements |
| Output Type | Active-high push-pull - eliminates external pullup resistor, reduces BOM count and board area |
| Operating Temperature | −40°C to 125°C - qualified for under-hood automotive environments per AEC-Q100 |
| ESD Protection | >2000 V HBM, >200 V MM - robust handling during PCB assembly and field service |
| Input Hysteresis | 40 mV - prevents oscillatory reset toggling near threshold during slow-rising or noisy supply conditions |
Pinout & Package
5-pin SOT-23 (DBV) package, 2.9 mm × 1.6 mm × 1.45 mm height, tape-and-reel (3000 pcs/reel), RoHS-compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CT | Delay Configuration Input | Ground for 10 ms delay; connect to VDD for 200 ms delay - no external components required |
| 2 - GND | Power Ground Reference | Return path for internal comparator and output driver; must be low-impedance connection to system ground plane |
| 3 - MR | Manual Reset Input | Active-low asynchronous reset trigger; internally pulled up to VDD (30 kΩ) - tie to VDD if unused |
| 4 - VDD | Supply Input | 1.6 V to 6 V operating range; bypass capacitor (0.1 µF ceramic) required near pin for stable threshold reference |
| 5 - RESET | Active-High Push-Pull Output | Drives high when VDD > VIT + hysteresis and delay complete; sinks 2 mA / sources 1 mA - direct interface to MCU reset pin |
Key Features
| Feature | Design Value |
|---|---|
| Nanopower Operation | 220 nA supply current enables integration into always-on automotive modules without compromising battery life |
| Automotive Qualification | AEC-Q100 Grade 1 qualification (−40°C to 125°C) ensures reliability in engine control, ADAS, and body electronics |
| Configurable Reset Timing | Single CT pin selects between 10 ms and 200 ms delay - eliminates need for external RC timing networks |
| Precision Threshold Accuracy | ±3% over temperature ensures deterministic reset behavior across full automotive operating range |
| Robust Manual Reset Interface | Internal 30 kΩ pullup on MR pin simplifies PCB layout and reduces component count versus external resistor solutions |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors 1.8 V core supply for automotive MCU during cold cranking when battery voltage dips below 9 V. IC Role / Device Role / Timing Role: Nanopower supervisory IC asserting active-high RESET to hold MCU in reset until stable 1.8 V rail is established. Use Value: Prevents corrupted firmware execution during marginal supply conditions using 1.71 V threshold with 40 mV hysteresis. |
Use Scenario: Provides power-on reset for vision processing SoC in rear-view camera module powered by 1.8 V LDO. IC Role / Device Role / Timing Role: Generates 200 ms RESET pulse (CT = VDD) to ensure complete SoC initialization before image sensor startup. Use Value: Eliminates need for discrete RC network while maintaining AEC-Q100 compliance and <220 nA quiescent draw. |
| Telematics Control Unit (TCU) | Electric Power Steering (EPS) Sensor Module |
Use Scenario: Supervises 1.8 V supply to LTE modem baseband processor during vehicle ignition sequence. IC Role / Device Role / Timing Role: Active-high push-pull RESET output directly interfaces to modem's reset pin without external pullup. Use Value: Reduces BOM count and improves signal integrity versus open-drain alternatives requiring external resistors. |
Use Scenario: Ensures deterministic startup of Hall-effect position sensor ASIC after 12 V battery connection. IC Role / Device Role / Timing Role: Detects 1.8 V rail rise with 10 ms delay (CT = GND) to synchronize sensor calibration with MCU readiness. Use Value: Guarantees clean reset assertion within 10 ms of valid supply, meeting ISO 26262 ASIL-B timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837E18-Q1 | Identical functionality, pinout, and specifications - same device family, alternate ordering suffix (Q1 vs G4Q1) | No functional difference; both qualified for automotive use with identical −40°C to 125°C operation | Select TPS3837E18-Q1 if standard TI part numbering is required for procurement systems |
| MAX6371KA18+T | 1.8 V threshold (1.76 V min), 1.2 µA supply current, fixed 140 ms delay, SOT-23-5 package | Higher quiescent current limits use in ultra-low-power applications; lacks CT-configurable delay | Choose MAX6371KA18+T only when legacy design reuse or dual-sourcing mandates Maxim Integrated compatibility |
Compared with 2U3837E18QDBVRG4Q1, TPS3837E18-Q1 offers identical performance and automotive qualification with standardized TI part numbering, while MAX6371KA18+T trades nanopower efficiency for broader vendor support but requires layout adaptation due to non-configurable timing.
Availability
2U3837E18QDBVRG4Q1 is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera modules, telematics units, and electric power steering sensor designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 2U3837E18QDBVRG4Q1 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, with leadership in power management, signal chain, and automotive ICs.
The TPS3837-Q1 product line delivers nanopower, AEC-Q100–qualified supervisory circuits specifically engineered for reliable reset generation in automotive microcontroller and DSP applications operating from 1.8 V to 3.3 V rails.
FAQ
What is the exact reset threshold voltage of the 2U3837E18QDBVRG4Q1?
The 2U3837E18QDBVRG4Q1 has a nominal reset threshold voltage of 1.71 V with ±3% tolerance over temperature. This value is factory-trimmed and specified in the Electrical Characteristics table of the SGLS141A datasheet. The 2U3837E18QDBVRG4Q1 achieves this precision using an internal bandgap-referenced voltage divider, ensuring consistent behavior across its −40°C to 125°C operating range.
Does the 2U3837E18QDBVRG4Q1 support manual reset functionality?
Yes, the 2U3837E18QDBVRG4Q1 supports manual reset via its MR pin (Pin 3). When MR is pulled low, it forces an immediate active-high RESET assertion regardless of VDD level. The device integrates a 30 kΩ internal pullup resistor on MR, so the pin can be left unconnected or tied to VDD if manual reset is not used - eliminating external components.
What are the power-on reset delay options for the 2U3837E18QDBVRG4Q1?
The 2U3837E18QDBVRG4Q1 provides two factory-selectable power-on reset delays: 10 ms (when CT pin is connected to GND) or 200 ms (when CT pin is connected to VDD). These values are typical; the datasheet specifies 5–15 ms and 100–300 ms ranges respectively. No external capacitors or resistors are needed - delay selection is purely pin-strapped.
Is the 2U3837E18QDBVRG4Q1 compatible with 1.8 V supply rails?
Yes, the 2U3837E18QDBVRG4Q1 is explicitly designed for 1.8 V systems. Its 1.71 V reset threshold provides appropriate margin for 1.8 V nominal rails, and it operates across a 1.6 V to 6 V supply range. The device maintains full functionality - including RESET assertion, delay timing, and MR response - at 1.8 V, making it ideal for modern low-voltage automotive MCUs and DSPs.
What package type and dimensions does the 2U3837E18QDBVRG4Q1 use?
The 2U3837E18QDBVRG4Q1 uses the 5-pin SOT-23 (DBV) package measuring 2.9 mm × 1.6 mm with a maximum height of 1.45 mm. It ships in tape-and-reel format (3000 units per reel) with Q3 quadrant pin-1 orientation. The package is RoHS-compliant, rated MSL Level-1, and qualified for reflow soldering at 260°C peak temperature.
2U3837E18QDBVRG4Q1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.71V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
2U3837E18QDBVRG4Q1 FAQ
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6.How does Aetrix verify that 2U3837E18QDBVRG4Q1 is sourced from the original manufacturer or authorized distributors?
All 2U3837E18QDBVRG4Q1 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 2U3837E18QDBVRG4Q1 meets industry standards.
7.What is the process for return or replacement of 2U3837E18QDBVRG4Q1?
All 2U3837E18QDBVRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with 2U3837E18QDBVRG4Q1, 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 2U3837E18QDBVRG4Q1 part is unused and in its original packaging.
Return procedure for 2U3837E18QDBVRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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