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Texas Instruments 2T05H33QDCKRG4Q
- Part No.:
- 2T05H33QDCKRG4Q
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
2T05H33QDCKRG4Q.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,754
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Product details
Overview
TPS3805H33-Q1 from Texas Instruments is an automotive-grade dual-voltage supervisor IC that monitors both a fixed 3.3-V supply (VDD) and an adjustable secondary voltage (SENSE) with 1.226-V threshold, asserting active-low RESET via push-pull output when either drops below its respective VIT. It delivers ±1.5% threshold accuracy, 3-μA typical supply current at 3.3 V, and operates across –40°C to 125°C for use in engine control units and ADAS domain controllers.
For engineers reviewing the TPS3805H33-Q1 datasheet, TPS3805H33-Q1 pinout, TPS3805H33-Q1 application, or TPS3805H33-Q1 equivalent, key selection criteria include dual-rail monitoring capability, push-pull reset drive strength, SC-70 package thermal performance, and AEC-Q100 qualification for automotive power sequencing and microcontroller supervision.
Technical Context
The TPS3805H33-Q1 implements two independent comparators: one with fixed 3.05-V threshold on VDD, and another with 1.226-V internal reference applied to SENSE via external resistor divider. Both paths feed into a logic OR gate driving the push-pull RESET output - deassertion requires *both* VDD > 3.05 V *and* SENSE > 1.226 V.
It features built-in 30-mV hysteresis for noise immunity, transient rejection up to 5.5 μs at 0.1-V overdrive, and power-on reset assertion below 0.8 V. The device is immune to short negative transients on VDD/SENSE pins and supports supply voltages from 1.3 V to 6 V with 0.1-μF local decoupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Threshold | 3.05 V ±1.5% - precisely monitors nominal 3.3-V rails without external scaling |
| SENSE Threshold | 1.226 V ±1.5% - enables adjustable monitoring of secondary supplies ≥1.226 V using R1/R2 divider |
| RESET Output Type | Push-pull - eliminates need for external pull-up resistor; drives high/low actively |
| Supply Current | 3 μA typical at 3.3 V - enables ultra-low-power supervision in always-on vehicle modules |
| Operating Temp | –40°C to 125°C - qualified per AEC-Q100 Grade 1 for under-hood and infotainment applications |
| Hysteresis | 30 mV - prevents chatter during slow-rising or noisy supply transitions |
| Package | 5-pin SC-70 (2.00 mm × 1.25 mm) - compact footprint for space-constrained automotive PCBs |
Pinout & Package
TPS3805H33-Q1 is housed in a 5-pin SC-70 (DCK) package with 2.00 mm × 1.25 mm body size and exposed pad thermal design. Pin 1 and Pin 5 are no-connect (NC) terminals with no internal bonding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 2) | Ground reference | Primary return path for internal comparators and output stage; must be low-impedance connection |
| RESET (Pin 3) | Active-low reset output | Push-pull driver capable of sourcing/sinking ≥1 mA; directly interfaces with MCU reset input |
| SENSE (Pin 5) | Adjustable voltage monitor input | High-impedance (±25 nA input current) node for resistor-divider feedback; requires 1–10 nF bypass capacitor |
| VDD (Pin 4) | Main supply and fixed-threshold input | Supplies internal circuitry and provides 3.05-V fixed detection; accepts 1.3–6 V input range |
| NC (Pin 1) | No internal connection | Unbonded terminal; may be left floating or tied to GND for mechanical stability |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monitoring | Simultaneously supervises primary 3.3-V rail (VDD) and secondary adjustable rail (SENSE), requiring both to be valid before RESET deassertion |
| AEC-Q100 Grade 1 qualification | Validated for automotive operation from –40°C to 125°C ambient, including HTOL, temperature cycling, and ESD testing |
| Push-pull RESET output | Eliminates external pull-up resistor, reduces BOM count, and ensures fast, deterministic reset release timing |
| Low quiescent current | 3 μA typical at 3.3 V enables integration into battery-backed or always-on domains without significant leakage impact |
| Transient-immune architecture | Rejects sub-5.5 μs negative transients on VDD/SENSE, preventing false resets in electrically noisy vehicle environments |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
|
Use Scenario: Monitors 3.3-V I/O supply and 1.8-V image sensor core rail during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring both power domains stabilize before releasing processor reset and enabling camera initialization sequence. Use Value: Prevents partial boot failures by enforcing strict AND-gated reset release, improving system robustness under dynamic automotive voltage conditions. |
Use Scenario: Supervises 3.3-V SerDes interface supply and 1.2-V ISP core supply in surround-view camera ECU. IC Role / Device Role / Timing Role: Provides synchronized reset assertion across two critical voltage domains to guarantee deterministic startup of vision processing pipeline. Use Value: Enables reliable power sequencing without external logic or timing components, reducing layout complexity and failure modes. |
| Automotive Infotainment Head Unit | Digital Instrument Cluster |
|
Use Scenario: Validates 3.3-V application processor I/O rail and 1.1-V GPU core rail after ignition-on power ramp. IC Role / Device Role / Timing Role: Dual-input supervisor triggering controlled reset of SoC only after both rails exceed thresholds with hysteresis margin. Use Value: Eliminates need for discrete comparators and OR gate, saving board area and improving thermal reliability in confined dash-space layouts. |
Use Scenario: Ensures stable 3.3-V display interface supply and 1.8-V microcontroller core supply before activating TFT backlight and CAN gateway firmware. IC Role / Device Role / Timing Role: Automotive-grade reset generator enforcing safe power-up order for safety-critical cluster subsystems. Use Value: Meets ASIL-B functional safety requirements through precise threshold accuracy and guaranteed reset pulse width (>140 ms). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3805H50-Q1 | Fixed VDD threshold = 4.63 V (not 3.05 V); identical SENSE threshold and push-pull output | Designed for 5-V systems; unsuitable for 3.3-V primary rail monitoring without level-shifting | Select only when supervising 5-V main supply + adjustable secondary rail |
| MAX6326-M33 | Single 3.3-V supervisor (no SENSE input); open-drain output; ±2.5% threshold accuracy vs ±1.5% | Lacks dual-rail capability; requires external pull-up; lower accuracy increases risk of marginal reset timing | Use only for cost-sensitive non-safety applications where secondary rail supervision is unnecessary |
Compared with TPS3805H33-Q1, TPS3805H50-Q1 shifts primary detection to 5 V but retains identical dual-monitoring architecture, while MAX6326-M33 sacrifices SENSE flexibility and precision for lower unit cost in single-rail designs.
Availability
TPS3805H33-Q1 is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, and digital instrument clusters requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for TPS3805H33-Q1 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 specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and communications markets.
The TPS380x-Q1 family delivers AEC-Q100-qualified voltage supervisors optimized for power sequencing and reset generation in automotive DSP, MCU, and processor-based systems - emphasizing accuracy, low power, and transient immunity.
FAQ
What is the exact VDD threshold voltage of the TPS3805H33-Q1?
The TPS3805H33-Q1 has a fixed VDD threshold voltage of 3.05 V with ±1.5% accuracy over temperature (–40°C to 125°C). This value is specified in the Electrical Characteristics table of the SGLS228C datasheet and applies directly to the 3.3-V nominal supply rail without external scaling. The TPS3805H33-Q1 does not require resistor dividers on VDD - it is factory-trimmed for direct 3.3-V monitoring.
Does the TPS3805H33-Q1 require an external pull-up resistor on the RESET pin?
No, the TPS3805H33-Q1 uses a push-pull RESET output stage, meaning it actively drives both high and low states without needing an external pull-up resistor. This differs from open-drain variants like TPS3803G15-Q1. The push-pull design simplifies schematic implementation, improves rise/fall times, and ensures deterministic reset release timing in automotive applications.
How is the SENSE input used in the TPS3805H33-Q1?
The SENSE input of the TPS3805H33-Q1 monitors a second voltage rail using an internal 1.226-V reference. A resistor divider (R1/R2) scales the target rail down to 1.226 V at SENSE. RESET remains asserted until *both* VDD > 3.05 V *and* SENSE > 1.226 V. The SENSE pin draws only ±25 nA, enabling high-impedance divider networks with minimal loading effect.
Is the TPS3805H33-Q1 qualified for automotive applications?
Yes, the TPS3805H33-Q1 is explicitly qualified per AEC-Q100 Grade 1 (–40°C to 125°C) and carries the "-Q1" suffix denoting automotive qualification. It undergoes stress testing including HTOL, temperature cycling, ESD (±2000 V HBM), and latch-up verification. The 2T05H33QDCKRG4Q part number is the production-orderable variant meeting full automotive reliability standards.
What package type and dimensions does the TPS3805H33-Q1 use?
The TPS3805H33-Q1 is packaged in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm with 0.65-mm lead pitch. This surface-mount package features an exposed thermal pad and is rated for moisture sensitivity level (MSL) 1 at 260°C peak reflow. The DCK package is documented in TI's Mechanical, Packaging, and Orderable Information section and matches the 2T05H33QDCKRG4Q ordering code.
2T05H33QDCKRG4Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.05V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 5µs Typical Propagation Delay
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
2T05H33QDCKRG4Q FAQ
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7.What is the process for return or replacement of 2T05H33QDCKRG4Q?
All 2T05H33QDCKRG4Q units undergo pre-shipment inspection (PSI). If there is an issue with 2T05H33QDCKRG4Q, 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 2T05H33QDCKRG4Q part is unused and in its original packaging.
Return procedure for 2T05H33QDCKRG4Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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