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Texas Instruments 2T28-33QDBVRG4Q1
- Part No.:
- 2T28-33QDBVRG4Q1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
2T28-33QDBVRG4Q1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
2T28-33QDBVRG4Q1 from Texas Instruments is an automotive-grade voltage supervisor IC with integrated watchdog timer, fixed 3.3 V supply monitoring threshold, 200 ms reset delay, active-low push-pull reset output, and manual reset input - used to ensure reliable power-on initialization and fault recovery in automotive microcontrollers and DSPs.
For engineers reviewing the 2T28-33QDBVRG4Q1 datasheet, 2T28-33QDBVRG4Q1 pinout, 2T28-33QDBVRG4Q1 application, or 2T28-33QDBVRG4Q1 equivalent, this page delivers verified specifications, AEC-Q100 Grade 1 compliance details, SOT-23-5 package mapping, functional pin roles, and validated automotive alternatives for system-level reset design.
Technical Context
The 2T28-33QDBVRG4Q1 implements a precision bandgap-based voltage reference and comparator to monitor VDD against a fixed 2.93 V nominal threshold (VIT−) with ±20 mV hysteresis, asserting RESET when VDD falls below VIT− or when the watchdog input (WDI) remains static beyond 1.6 s. Its internal 200 ms power-on reset timer begins after VDD exceeds VIT− + VHYS.
It features a dedicated manual reset (MR) input that forces active-low RESET regardless of VDD level or watchdog state, and supports bidirectional WDI signaling with automatic pulse generation when left floating - enabling robust supervision without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 1.1 V to 5.5 V - powers device and enables supervision of systems with brown-in/brown-out tolerance down to 1.1 V startup. |
| Threshold voltage (VIT−) | 2.84 V to 3.00 V (–40°C to 125°C) - precise 3.3 V rail monitoring with guaranteed margin over 3.3 V ±5% nominal. |
| Reset delay time (td) | 120 ms to 300 ms - ensures stable power-up before releasing downstream logic; 200 ms typical aligns with MCU boot timing. |
| Watchdog timeout (ttout) | 0.9 s to 2.5 s - detects firmware lockup in safety-critical automotive control loops; 1.6 s typical provides deterministic fault response. |
| Supply current (IDD) | 15 µA typical - enables always-on supervision in low-power automotive modules without significant battery drain. |
| ESD rating (HBM) | ±2000 V - meets MIL-STD-883 Method 3015 for handling in automotive manufacturing environments. |
| Operating temperature | –40°C to 125°C - qualified per AEC-Q100 Grade 1 for under-hood and infotainment applications. |
Pinout & Package
2T28-33QDBVRG4Q1 is housed in a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size, optimized for space-constrained automotive PCB layouts and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull output | Drives microcontroller reset pin directly; sinks up to 3 mA at 0.45 V - no external pull-up required. |
| 2: GND | Ground reference | Low-impedance return path for internal comparators and output stage; must be connected to system ground plane. |
| 3: MR | Manual reset input | Active-low signal; pulls RESET low when asserted; internal 90 kΩ pull-up allows NC or VDD tie-off. |
| 4: WDI | Watchdog timer input | Accepts falling-edge-triggered pulses; floating state auto-generates internal pulses to prevent spurious reset. |
| 5: VDD | Supply and monitored rail | Powers device and serves as supervised voltage source; requires 0.1 µF ceramic bypass capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to 125°C operation with HBM ±2000 V and CDM ±750 V - suitable for engine control and ADAS modules. |
| Fixed 3.3 V supervision threshold | 2.93 V nominal with ±7 mV variation over temperature - eliminates external resistor divider and calibration overhead. |
| Integrated 200 ms reset delay | Guaranteed minimum 120 ms delay ensures stable power delivery before releasing processor reset - no RC timing component needed. |
| Dual-initiation reset logic | Responds to both supply droop (VDD < VIT−) and watchdog timeout (WDI inactivity > 1.6 s) - provides layered fault detection. |
| Manual reset with internal pull-up | 90 kΩ on-chip MR pull-up enables single-wire interface; simplifies board layout and reduces BOM count vs discrete pull-up. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Monitors 3.3 V supply powering MCU and CAN transceiver during cold cranking and load dump events. IC Role / Device Role / Timing Role: Voltage supervisor with watchdog - asserts RESET if VDD drops below 2.84 V or if MCU fails to toggle WDI within 1.6 s. Use Value: Prevents erratic ECU behavior during transient voltage conditions; guarantees clean restart after brownout or software hang. |
Use Scenario: Supervises vision processor power rail in camera module exposed to wide thermal cycling and EMI. IC Role / Device Role / Timing Role: Reset generator with 200 ms delay - holds processor in reset until 3.3 V stabilizes post-power-up and verifies firmware liveness via WDI. Use Value: Eliminates need for external RC network; maintains functional safety integrity per ISO 26262 ASIL-B requirements. |
| Automotive Infotainment Head Unit | Electric Power Steering (EPS) Controller |
|
Use Scenario: Ensures reliable boot sequence for ARM-based SoC running Linux-based IVI stack with multiple voltage domains. IC Role / Device Role / Timing Role: Dual-trigger supervisor - initiates reset on supply fault or watchdog timeout, with MR supporting soft-reboot via button press. Use Value: Reduces field failure rate from partial boot hangs; supports user-initiated recovery without full power cycle. |
Use Scenario: Provides fail-safe reset for torque-control MCU operating in high-vibration, high-temperature steering column environment. IC Role / Device Role / Timing Role: AEC-Q100-compliant supervisor - monitors 3.3 V rail and validates MCU health via WDI; outputs active-low RESET to safety shutdown circuitry. Use Value: Meets ASIL-C diagnostic coverage requirements by detecting both power faults and software stalls within defined time bounds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3823-33QDBVRQ1 | Identical pinout, same 3.3 V threshold and 200 ms delay, but lacks G4 suffix - not automotive-qualified (no AEC-Q100 Grade 1). | Restricted to industrial or consumer use; unsuitable for production automotive ECUs requiring automotive qualification. | Select only for non-automotive prototyping or cost-sensitive non-safety designs where AEC-Q100 is not mandated. |
| TLV803E33DBVR | 3.3 V supervisor with 200 ms delay and active-low open-drain output; no watchdog or MR; lower quiescent current (0.5 µA). | Lacks fault-detection redundancy - cannot detect MCU lockup; limited to basic power-good assertion only. | Choose when watchdog and manual reset are unnecessary and ultra-low power (<1 µA) is critical, e.g., battery-backed modules. |
Compared with TPS3823-33QDBVRQ1 and TLV803E33DBVR, the 2T28-33QDBVRG4Q1 uniquely combines AEC-Q100 Grade 1 qualification, integrated watchdog, manual reset, and push-pull output - making it the only option meeting full ASIL-B reset supervision requirements in production automotive systems.
Availability
2T28-33QDBVRG4Q1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, infotainment head units, and electric power steering controllers requiring stable component supply across extended temperature and lifecycle demands.
Supply support for 2T28-33QDBVRG4Q1 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 automotive ICs, power management, and precision analog.
The TPS382x-Q1 product line delivers AEC-Q100-qualified supervisors for automotive processors and microcontrollers - designed specifically to meet functional safety and reliability requirements in engine, chassis, and driver-assistance systems.
FAQ
What is the exact supply voltage threshold monitored by the 2T28-33QDBVRG4Q1?
The 2T28-33QDBVRG4Q1 monitors VDD against a fixed negative-going input threshold voltage (VIT−) of 2.84 V to 3.00 V over –40°C to 125°C, with 2.93 V nominal - calibrated for 3.3 V ±5% rails. This threshold is set by an internal voltage divider and requires no external components. The 2T28-33QDBVRG4Q1 uses this value to assert RESET when VDD falls below VIT−, ensuring accurate undervoltage detection in automotive environments.
Does the 2T28-33QDBVRG4Q1 include a watchdog timer, and what is its timeout period?
Yes, the 2T28-33QDBVRG4Q1 includes a watchdog timer with a nominal timeout period of 1.6 s (range 0.9 s to 2.5 s), activated via the WDI pin. If WDI remains static (high or low) beyond this interval, RESET is asserted for the 200 ms delay period. The 2T28-33QDBVRG4Q1 also generates internal pulses when WDI is floating, preventing unintended resets - a key feature for robust automotive firmware supervision.
What package type and pin configuration does the 2T28-33QDBVRG4Q1 use?
The 2T28-33QDBVRG4Q1 uses a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size. Pin 1 is active-low RESET (push-pull), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is WDI (watchdog input), and Pin 5 is VDD. This pinout matches TPS3823/3828-Q1 variants and is validated for automotive PCB assembly per JEDEC J-STD-020 moisture sensitivity level 1.
Is the 2T28-33QDBVRG4Q1 qualified for automotive applications, and what standards does it meet?
Yes, the 2T28-33QDBVRG4Q1 is fully qualified per AEC-Q100 with Grade 1 temperature rating (–40°C to 125°C), HBM ESD classification Level 2 (±2000 V), and CDM Level C4B (±750 V). It meets automotive reliability stress test requirements for integrated circuits and is intended for production use in safety-critical systems such as engine control, ADAS, and EPS - confirmed in TI's official TPS382x-Q1 family documentation.
How does the manual reset (MR) function operate on the 2T28-33QDBVRG4Q1?
The MR pin on the 2T28-33QDBVRG4Q1 is an active-low input with an internal 90 kΩ pull-up resistor. When pulled low, it forces RESET to assert immediately - independent of VDD level or watchdog state - and holds RESET low for the full 200 ms delay after MR returns high. This enables hardware-initiated resets for diagnostics or user recovery. The 2T28-33QDBVRG4Q1 allows MR to remain unconnected or tied to VDD when unused, eliminating external components.
2T28-33QDBVRG4Q1 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:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 120ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
2T28-33QDBVRG4Q1 FAQ
1.How can I place an order for 2T28-33QDBVRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2T28-33QDBVRG4Q1 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 2T28-33QDBVRG4Q1 reliable?
The price and inventory of 2T28-33QDBVRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2T28-33QDBVRG4Q1 is usually 5 days.
3.What payment methods are accepted for 2T28-33QDBVRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2T28-33QDBVRG4Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2T28-33QDBVRG4Q1?
2T28-33QDBVRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2T28-33QDBVRG4Q1 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 2T28-33QDBVRG4Q1?
For technical support, including 2T28-33QDBVRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2T28-33QDBVRG4Q1 requirements.
6.How does Aetrix verify that 2T28-33QDBVRG4Q1 is sourced from the original manufacturer or authorized distributors?
All 2T28-33QDBVRG4Q1 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 2T28-33QDBVRG4Q1 meets industry standards.
7.What is the process for return or replacement of 2T28-33QDBVRG4Q1?
All 2T28-33QDBVRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with 2T28-33QDBVRG4Q1, 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 2T28-33QDBVRG4Q1 part is unused and in its original packaging.
Return procedure for 2T28-33QDBVRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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