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Texas Instruments TPS38A5151IIDYYRQ1
- Part No.:
- TPS38A5151IIDYYRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-14 Thin, SOT-23 Variant
- Datasheet:
-
TPS38A5151IIDYYRQ1.pdf
- Description:
- AUTOMOTIVE 65-V DUAL-CHANNEL SUP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS38A5151IIDYYRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive dual-channel overvoltage/undervoltage detector with 65 V input rating, 1 μA typical quiescent current, and programmable sense/reset delays via external capacitors. It monitors two independent voltage rails (SENSE1/SENSE2) for OV/UV faults in 12 V/24 V battery systems and delivers precise reset signaling to MCUs or power controllers in telematics and body control modules.
For engineers reviewing the TPS38A5151IIDYYRQ1 datasheet, TPS38A5151IIDYYRQ1 pinout, TPS38A5151IIDYYRQ1 application, or TPS38A5151IIDYYRQ1 equivalent, this device offers confirmed 1% threshold accuracy (800 mV and 2.7–36 V options), 2–13% selectable hysteresis, dual open-drain outputs, manual reset capability, and SOT-23-14 package compatibility with wettable flanks for AOI inspection.
Technical Context
The TPS38A5151IIDYYRQ1 implements independent dual-channel sensing with separate SENSE1/SENSE2 inputs, each supporting configurable OV or UV detection modes and user-defined hysteresis (2–13% or fixed 0.5–2.5 V). Its internal reference architecture enables 1% threshold accuracy across –40°C to +125°C ambient, while high-impedance SENSE pins allow direct connection to battery rails or resistor-divided voltages without loading error.
Timing is fully programmable: CTS1/CTS2 set sense delay (1.28 ms to 1.28 s), CTR1/CTR2 set reset delay (12.8 ms to 12.8 s), and MR functionality is integrated into CTR1/CTR2 pins. The device features no internal clamps-external protection must limit all pins to ≤70 V per absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.7 V to 65 V - supports direct connection to automotive 12 V/24 V battery rails without pre-regulation |
| Threshold Accuracy | ±1% for 800 mV option; ±1.5% for 2.7–36 V range - ensures reliable fault detection under temperature and aging stress |
| Quiescent Current | 1 μA typical at 25°C - enables always-on monitoring in low-power vehicle subsystems |
| Sense Delay Range | 1.28 ms to 1.28 s (via 10 nF–10 μF on CTS1/CTS2) - rejects cold-crank transients and supply noise |
| Reset Delay Range | 12.8 ms to 12.8 s (via 10 nF–10 μF on CTR1/CTR2) - prevents premature MCU boot during unstable rail recovery |
| Hysteresis Options | 2–13% in 1% steps or fixed 0.5/1/1.5/2/2.5 V - eliminates chatter during slow-ramp or noisy voltage transitions |
| Output Topology | Channel 1: Open-drain or push-pull; Channel 2: Open-drain only - provides flexible interface to diverse logic families |
Pinout & Package
TPS38A5151IIDYYRQ1 is packaged in a 14-pin SOT-23 (DYY) with 4.1 mm × 1.9 mm body size and wettable flanks for automated optical inspection. All GND pins (pins 8 and 13) must be connected to board ground; NC pins (2, 5, 14) are unconnected and must remain floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Input Supply Voltage | Bypass with 0.1 µF capacitor to GND; powers internal circuitry and supports 2.7–65 V operation |
| SENSE1 (Pin 3) | Channel 1 Monitoring Input | High-impedance input for OV/UV detection on first rail; supports internal divider or external resistor network |
| SENSE2 (Pin 4) | Channel 2 Monitoring Input | Independent high-Z input for second rail; enables redundancy in safety-critical automotive systems |
| RESET1 (Pin 6) | Channel 1 Reset Output | Configurable as open-drain or push-pull; asserts on SENSE1 fault after CTS1/CTR1 delays |
| RESET2 (Pin 7) | Channel 2 Reset Output | Open-drain only; asserts on SENSE2 fault with independent timing control via CTS2/CTR2 |
| CTR1/MR (Pin 9) | Channel 1 Reset Delay & Manual Reset | Capacitor-programmable delay; driven low to force immediate RESET1 assertion |
| CTR2/MR (Pin 12) | Channel 2 Reset Delay & Manual Reset | Capacitor-programmable delay; driven low to force immediate RESET2 assertion |
| CTS1 (Pin 10) | Channel 1 Sense Delay | Ground-referenced capacitor sets time before RESET1 responds to SENSE1 fault |
| CTS2 (Pin 11) | Channel 2 Sense Delay | Ground-referenced capacitor sets time before RESET2 responds to SENSE2 fault |
| GND (Pins 8, 13) | Ground Reference | Two dedicated ground terminals - must be electrically tied to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent OV/UV monitoring | Enables simultaneous supervision of primary and backup power rails or critical sub-systems (e.g., MCU core + I/O supply) |
| 65 V-rated SENSE and VDD pins | Eliminates need for external level-shifting or clamping circuits when interfacing directly with automotive battery |
| Programmable hysteresis (2–13%) | Prevents false resets during engine cranking, start-stop cycles, or load-dump events without requiring external components |
| Manual reset integration | CTR1/CTR2 pins double as MR inputs - simplifies system-level reset coordination without adding discrete logic |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV and CDM ±750 V ESD robustness |
Applications
| Telematics Control Unit | Emergency Call System |
|---|---|
Use Scenario: Monitors main 12 V battery and auxiliary 5 V supply during vehicle ignition, motion, and crash events. IC Role / Device Role / Timing Role: Dual-channel OV/UV detector providing independent reset signals to baseband processor and GNSS module. Use Value: Prevents firmware lockup during cold-crank (≤6 V) or load-dump (≥60 V) by asserting reset with 1.28 ms sense delay and 12.8 ms hold time. |
Use Scenario: Supervises power integrity of eCall modem and accelerometer during airbag deployment and post-crash communication. IC Role / Device Role / Timing Role: Fault monitor triggering controlled shutdown and safe re-initialization sequence upon detected undervoltage. Use Value: Guarantees system reset within 100 µs of VDD falling below 2.7 V UVLO threshold, meeting ISO 26262 ASIL-B timing requirements. |
| Audio Amplifier | Head Unit and Cluster |
Use Scenario: Ensures clean power-up sequencing and brownout recovery for Class-D amplifier ICs in infotainment systems. IC Role / Device Role / Timing Role: Dual-rail supervisor verifying both 12 V amplifier supply and 3.3 V DSP core voltage before enabling output stage. Use Value: Uses 800 mV threshold on SENSE2 to detect DSP rail collapse with ±1% accuracy, preventing audio distortion or latch-up. |
Use Scenario: Provides fail-safe reset for instrument cluster MCU and display driver ICs during battery voltage fluctuations. IC Role / Device Role / Timing Role: Dual-channel detector generating synchronized reset pulses for microcontroller and graphics controller. Use Value: Leverages push-pull RESET1 and open-drain RESET2 to drive mixed-voltage logic domains without external translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel automotive voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33QDBVRQ1 | Single-channel, fixed 3.3 V threshold, no SENSE pin - uses internal VDD monitoring only | Lacks dual-rail independence and programmable hysteresis; suitable only for simple single-supply reset | Select when supervising one rail with fixed threshold and minimal BOM count is prioritized over flexibility |
| MAX6326TTUT+T | Single-channel, 3.08 V fixed threshold, 120 ms factory-set reset timeout, no sense delay | No OV detection, no programmability, no automotive qualification - limited to industrial non-safety systems | Choose only for cost-sensitive non-automotive applications where timing and voltage flexibility are not required |
Compared with TPS38A5151IIDYYRQ1, both alternatives lack dual-channel independence, programmable sense/reset timing, and 65 V SENSE pin rating - making them unsuitable for redundant automotive power monitoring where rail-specific OV/UV response and transient immunity are mandatory.
Availability
TPS38A5151IIDYYRQ1 is available at Aetrix Electronics and suitable for telematics control units, emergency call systems, and head unit and cluster designs requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for TPS38A5151IIDYYRQ1 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 specializing in analog, embedded processing, and automotive-grade power management solutions with over 90 years of innovation in high-reliability electronics.
The TPS38-Q1 product line delivers automotive-grade voltage supervisors optimized for battery-connected systems requiring ultra-low IQ, wide VIN, and functional safety documentation support - targeting ASIL-B compliant power monitoring in ADAS and infotainment ECUs.
FAQ
What is the operating temperature range for the TPS38A5151IIDYYRQ1?
The TPS38A5151IIDYYRQ1 is qualified to AEC-Q100 Grade 1 specifications, supporting continuous operation from –40°C to +125°C ambient temperature. This range covers under-hood and dashboard environments in passenger vehicles and commercial trucks, and is validated across all electrical parameters including threshold accuracy, hysteresis, and reset timing.
Does the TPS38A5151IIDYYRQ1 require external resistors for voltage threshold setting?
No - the TPS38A5151IIDYYRQ1 integrates precision internal resistor dividers enabling fixed 800 mV and 2.7–36 V threshold options without external components. External resistors are optional and supported only when higher flexibility is needed; the 800 mV bypass mode is recommended for such cases to minimize input current and improve detection speed.
How does the manual reset (MR) function work on the TPS38A5151IIDYYRQ1?
The TPS38A5151IIDYYRQ1 integrates manual reset into its CTR1/MR and CTR2/MR pins: driving either pin low forces immediate assertion of the corresponding RESET1 or RESET2 output, independent of SENSE voltage state. These pins must never be driven high and may be left floating or connected to timing capacitors for reset delay configuration.
What package type is used for the TPS38A5151IIDYYRQ1?
The TPS38A5151IIDYYRQ1 uses the SOT-23-14 (DYY) package with 4.1 mm × 1.9 mm body size and wettable flanks. This package supports automatic optical inspection (AOI) and meets IPC-A-610 Class 3 solder joint requirements for automotive production, with two dedicated GND pins (8 and 13) and three NC pins (2, 5, 14).
Can the TPS38A5151IIDYYRQ1 monitor voltages higher than its VDD supply?
Yes - the TPS38A5151IIDYYRQ1 allows SENSE1 and SENSE2 to operate up to 65 V independently of VDD, which can be as low as 2.7 V. This enables direct battery rail monitoring (e.g., 12 V or 24 V) while powering the IC from a regulated 3.3 V domain, supporting architectural separation between power supervision and system logic domains.
TPS38A5151IIDYYRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-14 Thin, SOT-23 Variant
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Voltage Detector
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 5.1V, 5.1V
- Output:
- Open Drain, Open Drain
- Reset:
- Active Low
- Reset Timeout:
- 12.8s Maximum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOT-23-THIN
TPS38A5151IIDYYRQ1 FAQ
1.How can I place an order for TPS38A5151IIDYYRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS38A5151IIDYYRQ1 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 TPS38A5151IIDYYRQ1 reliable?
The price and inventory of TPS38A5151IIDYYRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS38A5151IIDYYRQ1 is usually 5 days.
3.What payment methods are accepted for TPS38A5151IIDYYRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS38A5151IIDYYRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS38A5151IIDYYRQ1?
TPS38A5151IIDYYRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS38A5151IIDYYRQ1 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 TPS38A5151IIDYYRQ1?
For technical support, including TPS38A5151IIDYYRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS38A5151IIDYYRQ1 requirements.
6.How does Aetrix verify that TPS38A5151IIDYYRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS38A5151IIDYYRQ1 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 TPS38A5151IIDYYRQ1 meets industry standards.
7.What is the process for return or replacement of TPS38A5151IIDYYRQ1?
All TPS38A5151IIDYYRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS38A5151IIDYYRQ1, 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 TPS38A5151IIDYYRQ1 part is unused and in its original packaging.
Return procedure for TPS38A5151IIDYYRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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