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Texas Instruments 2U3837K33QDBVRG4Q1
- Part No.:
- 2U3837K33QDBVRG4Q1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
2U3837K33QDBVRG4Q1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,374
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Product details
Overview
2U3837K33QDBVRG4Q1 from Texas Instruments is an automotive-grade nanosupervisory circuit with 2.93 V fixed reset threshold, push-pull active-high RESET output, 220 nA typical supply current, and selectable 10 ms / 200 ms power-on reset delay via CT pin - used for reliable power-up sequencing in battery-powered automotive microcontrollers.
For engineers reviewing the 2U3837K33QDBVRG4Q1 datasheet, 2U3837K33QDBVRG4Q1 pinout, 2U3837K33QDBVRG4Q1 application, or 2U3837K33QDBVRG4Q1 equivalent, this page delivers verified functional identity, validated SOT-23-5 pin mapping, confirmed automotive temperature range (−40°C to 125°C), exact threshold hysteresis (40 mV), and real-world alternative part comparisons for low-power system reset design.
Technical Context
The 2U3837K33QDBVRG4Q1 implements a precision bandgap-based voltage reference with internal resistor divider to set a fixed 2.93 V reset threshold (VIT) and 40 mV hysteresis, ensuring stable trip point across temperature. Its refresh timer initiates after VDD exceeds VIT and supports two delay modes: 10 ms (CT = GND) or 200 ms (CT = VDD).
It features manual reset (MR) with −200 µA low-level input current and internal 30 kΩ pullup, enabling clean external reset assertion. The active-high push-pull RESET output drives up to −2 mA at 3.3 V while maintaining VOL ≤ 0.4 V, eliminating need for external pullup resistors in most MCU interface configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.93 V ±0.11 V - precisely monitors 3.3 V rail for brownout detection without external components |
| 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 boot requirements |
| Output Type | Active-high push-pull - directly interfaces with MCU nRST pins requiring high-true reset signal |
| Operating Temperature | −40°C to 125°C - qualified per AEC-Q100 for under-hood and infotainment module deployment |
| Hysteresis | 40 mV - prevents oscillation during slow-rising or noisy supply transitions |
| ESD Rating | 2000 V HBM, 200 V MM - robust against assembly and field electrostatic discharge events |
Pinout & Package
5-pin SOT-23 (DBV) package, 1.45 mm max height, JEDEC MO-178 compliant, tape-and-reel (3000 pcs/reel), Q1 quadrant orientation.
| 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 capacitor required |
| 2 - GND | Power Ground Reference | Return path for internal reference and output stage; 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); accepts 0 V to VDD logic levels |
| 4 - VDD | Supply Input | Accepts 1.6 V to 6 V; powers internal reference, timer, and output driver; requires 0.1 µF ceramic bypass |
| 5 - RESET | Active-High Push-Pull Output | Drives high (≥0.8×VDD) when VDD ≥ VIT + hysteresis and delay complete; sinks ≤0.4 V at 2 mA |
Key Features
| Feature | Design Value |
|---|---|
| Nanopower Operation | 220 nA supply current enables integration into always-on automotive subsystems without compromising battery life |
| Automotive Qualification | AEC-Q100 Grade 1 qualification ensures reliability in harsh automotive environments including thermal cycling and vibration |
| Fixed Precision Threshold | 2.93 V ±3.8% over −40°C to 125°C eliminates calibration overhead and reduces BOM count vs adjustable supervisors |
| Configurable Reset Timing | Two factory-set delay options (10 ms / 200 ms) selected by single CT pin connection - no external RC network needed |
| Robust Manual Reset Interface | −200 µA MR input current and internal 30 kΩ pullup simplify external switch or microcontroller GPIO interfacing |
Applications
| Engine Control Unit (ECU) Power Sequencing | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Ensures deterministic startup of 32-bit RISC microcontrollers during cold cranking when battery voltage dips to 6 V then recovers. IC Role / Device Role / Timing Role: Monitors 3.3 V domain derived from buck converter; asserts active-high RESET until stable and delayed. Use Value: Prevents firmware lockup by guaranteeing minimum 10 ms reset pulse even during marginal supply recovery. |
Use Scenario: Supervises power rails for LIN transceivers and door module MCUs in low-quiescent-current sleep mode. IC Role / Device Role / Timing Role: Provides wake-up reset signal synchronized to VDD rise; supports manual reset via vehicle CAN command. Use Value: Enables <250 nA system standby current while retaining fast, glitch-free reset response on power restoration. |
| Telematics Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Camera Module |
Use Scenario: Manages power-on initialization of dual-core application processors and cellular modems in connected car gateways. IC Role / Device Role / Timing Role: Generates 200 ms reset delay (CT = VDD) to accommodate slow-starting PMIC outputs before releasing processor reset. Use Value: Eliminates need for discrete RC timing network, reducing PCB area and improving timing accuracy vs passive solutions. |
Use Scenario: Guarantees clean reset of image signal processor (ISP) and MIPI CSI-2 serializer during ignition cycle. IC Role / Device Role / Timing Role: Detects 3.3 V camera rail dropout below 2.93 V; asserts RESET within 10 µs to halt corrupted frame capture. Use Value: Reduces risk of sensor hang or corrupted boot sequence in safety-critical vision systems operating at 125°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33QDBVRQ1 | Identical electrical specs, same SOT-23-5 package, identical marking code PDTQ, and identical AEC-Q100 qualification - direct replacement with same reel packaging. | No functional difference; both support 2.93 V threshold, active-high push-pull output, and 10/200 ms delay selection. | Select TPS3837K33QDBVRQ1 if standard TI part numbering is required for procurement or legacy BOM alignment. |
| MAX6373KA33+T | 3.3 V threshold (±1.5%), 1.6 µA supply current, fixed 200 ms delay, open-drain output - higher quiescent current and no CT pin flexibility. | Suitable for non-automotive industrial systems where AEC-Q100 is not mandated and push-pull drive is unnecessary. | Choose MAX6373KA33+T only for cost-sensitive non-automotive designs accepting higher current and reduced configurability. |
Compared with 2U3837K33QDBVRG4Q1, TPS3837K33QDBVRQ1 offers identical performance and drop-in compatibility, while MAX6373KA33+T trades nanopower efficiency and automotive qualification for lower unit cost in commercial applications.
Availability
2U3837K33QDBVRG4Q1 is available at Aetrix Electronics and suitable for automotive ECU power sequencing, telematics gateway reset management, and ADAS camera module supervision requiring stable component supply across extended temperature and long product lifecycles.
Supply support for 2U3837K33QDBVRG4Q1 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 automotive electronics.
The TPS3837-Q1 family was designed specifically for automotive microcontroller and DSP power supervision, emphasizing ultra-low current, AEC-Q100 compliance, and precise voltage monitoring in safety-critical systems.
FAQ
What is the exact reset threshold voltage of the 2U3837K33QDBVRG4Q1?
The 2U3837K33QDBVRG4Q1 has a nominal reset threshold voltage of 2.93 V, with a guaranteed range of 2.82 V to 3.10 V across −40°C to 125°C. This value is factory-trimmed and fixed - no external resistor network is required to set or adjust the trip point. The 2U3837K33QDBVRG4Q1 uses an internal precision voltage divider referenced to a bandgap core to achieve this stability.
Does the 2U3837K33QDBVRG4Q1 support both 10 ms and 200 ms reset delays?
Yes, the 2U3837K33QDBVRG4Q1 supports both delay options via the CT pin: connecting CT to GND selects a typical 10 ms delay, while connecting CT to VDD selects a typical 200 ms delay. These values are specified at TA = 25°C and remain within 5–15 ms and 100–300 ms respectively across full temperature range. No external capacitor is needed - the timing is fully integrated.
Is the 2U3837K33QDBVRG4Q1 pin-compatible with other TPS383x-Q1 variants?
Yes, the 2U3837K33QDBVRG4Q1 shares identical 5-pin SOT-23 (DBV) pinout with all TPS3836/3837/3838-Q1 family members, including TPS3837K33QDBVRQ1 and TPS3836K33QDBVRQ1. Pin functions (CT, GND, MR, VDD, RESET) are consistent across the family - only the RESET polarity and threshold voltage differ between part numbers.
What is the maximum supply voltage rating for the 2U3837K33QDBVRG4Q1?
The absolute maximum supply voltage (VDD) for the 2U3837K33QDBVRG4Q1 is 7 V, but the recommended operating range is 1.6 V to 6 V. Operating continuously at 7 V is limited to ≤1000 hours per TI's reliability guidance. For automotive 12 V systems, the 2U3837K33QDBVRG4Q1 must be powered from a regulated 3.3 V or 5 V rail - not directly from the battery.
How does the manual reset (MR) pin function on the 2U3837K33QDBVRG4Q1?
The MR pin on the 2U3837K33QDBVRG4Q1 is an active-low, CMOS-compatible input with internal 30 kΩ pullup to VDD. Asserting MR = 0 V forces immediate active-high RESET assertion regardless of VDD level. When unused, MR should be tied to VDD to minimize leakage current. Input current is −200 µA at 0 V, ensuring compatibility with open-drain GPIO or mechanical switches.
2U3837K33QDBVRG4Q1 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:
- 2.93V
- 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
2U3837K33QDBVRG4Q1 FAQ
1.How can I place an order for 2U3837K33QDBVRG4Q1 through Aetrix?
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6.How does Aetrix verify that 2U3837K33QDBVRG4Q1 is sourced from the original manufacturer or authorized distributors?
All 2U3837K33QDBVRG4Q1 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 2U3837K33QDBVRG4Q1 meets industry standards.
7.What is the process for return or replacement of 2U3837K33QDBVRG4Q1?
All 2U3837K33QDBVRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with 2U3837K33QDBVRG4Q1, 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 2U3837K33QDBVRG4Q1 part is unused and in its original packaging.
Return procedure for 2U3837K33QDBVRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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