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Texas Instruments LM9071S/NOPB
- Part No.:
- LM9071S/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM9071S/NOPB.pdf
- Description:
- IC REG LIN 5V 250MA DDPAK/TO263
- Quantity:
- Payment:
- Shipping:
Inventory:450
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Product details
Overview
LM9071S/NOPB from Texas Instruments is a 5 V, 250 mA automotive-grade low-dropout linear voltage regulator with integrated delayed active-low reset output. It delivers ±3% output voltage tolerance, <800 mV dropout at full load, and operates across −40°C to +125°C in TO-263 (DDPAK) package. It is used to power microprocessor subsystems in engine control units where input transients up to +60 V and reverse battery events must be tolerated without system reset corruption.
For engineers reviewing the LM9071S/NOPB datasheet, LM9071S/NOPB pinout, LM9071S/NOPB application, or LM9071S/NOPB equivalent, this page provides verified technical context, thermal design guidance for TO-263 layout, reset delay timing equations, RFI-immune operation details, and validated automotive-grade alternatives with documented functional differences.
Technical Context
The LM9071S/NOPB integrates a PNP pass transistor with saturation detection logic to suppress input current surges during dropout, preventing oscillation under high-inductance input conditions. Its reset circuit monitors output voltage drop of −300 mV to −500 mV relative to nominal 5 V and holds the open-drain RESET# output low until an externally programmed capacitor charges via 10–30 µA internal current source.
Designed for ISO 7637-2 compliant automotive environments, it withstands +60 V/100 ms positive transients and −50 V/1 ms negative transients, while reverse-battery protection limits VOUT to −0.8 V when VIN = −15 V. Radiated RFI immunity is ensured up to 300 V/m from 2 MHz to 400 MHz without false resets when using ≥47 µF/ESR < 3 Ω output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±3% (4.85–5.15 V), tightly regulated over 5–250 mA load and −40°C to +125°C ambient. |
| Dropout Voltage | ≤800 mV at 250 mA load, enabling stable 5 V output from as low as 5.8 V input in warm-cranking conditions. |
| Reset Threshold | −300 mV to −500 mV drop from nominal VOUT, triggering reliable microcontroller reset before logic-level violation. |
| Reset Delay | 7.6–35 ms programmable via external capacitor (e.g., 0.1 µF), ensuring CPU clock and supply stabilization pre-boot. |
| Input Transient Withstand | +60 V for ≤100 ms and −50 V for ≤1 ms, eliminating need for external TVS in standard load-dump protection. |
| RFI Immunity | Operates without false reset under 300 V/m radiated field (2–400 MHz), validated per automotive EMC requirements. |
| Thermal Shutdown | Activates >150°C junction temperature; TO-263 θJ-A = 80°C/W (no heatsink), reducible to 32°C/W with 1.6 in² copper area. |
Pinout & Package
LM9071S/NOPB uses the 5-pin TO-263 (DDPAK, package code KTT0005B) surface-mount package. The exposed tab is internally connected to GND and serves as primary thermal path. Pin 1 is located in Quadrant Q2 per tape-and-reel orientation standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 6–26 V DC; withstands +60 V/100 ms transients and −50 V/1 ms reverse spikes. |
| 2 (GND) | Ground reference | Common return for regulator, reset circuit, and internal protection logic; tied to exposed tab. |
| 3 (OUT) | Regulated 5 V output | Delivers up to 250 mA; requires ≥47 µF/ESR < 3 Ω ceramic or tantalum output capacitor for stability. |
| 4 (RESET#) | Active-low reset flag | Open-drain output; sinks up to 5 mA; pulled high internally via 12–80 kΩ resistor; asserts low on VOUT drop ≥300 mV. |
| 5 (DELAY) | Reset delay timing node | Connects to external capacitor (e.g., 0.1 µF); charged by 10–30 µA current source to set reset timeout interval. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade reliability | Qualified per AEC-Q100; operates continuously from −40°C to +125°C ambient with built-in thermal shutdown. |
| Reverse battery protection | Prevents damage during −15 V battery connection; clamps VOUT to −0.8 V, protecting downstream 5 V logic. |
| RFI-hardened reset logic | Immune to 300 V/m radiated fields (2–400 MHz); avoids spurious resets in noisy engine bay environments. |
| Programmable reset delay | Delay time set by single external capacitor (e.g., 0.1 µF → 7.6–35 ms), enabling precise boot sequencing control. |
| Integrated transient protection | No external TVS required for ISO 7637-2 Pulse 1, 2a, 3a/b; handles +60 V/100 ms and −50 V/1 ms events internally. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powers 5 V microcontroller, CAN transceiver, and sensor interface circuits in gasoline/diesel engine management systems exposed to cranking, load dump, and RF noise. IC Role / Device Role / Timing Role: Primary 5 V system regulator with fault-aware reset signaling; ensures deterministic boot after brownout or transient recovery. Use Value: Eliminates need for discrete reset IC and TVS diode, reducing BOM count while meeting ISO 16750-2 electrical stress requirements. |
Use Scenario: Supplies 5 V rail to door module MCUs, LIN transceivers, and LED drivers in vehicle body electronics subject to battery disconnect/reconnect cycles. IC Role / Device Role / Timing Role: System supervisor with delayed reset; prevents MCU lockup during battery jump-start or alternator ripple events. Use Value: Enables robust power-up sequencing without external RC timing networks, improving production test yield and field reliability. |
| Transmission Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Power Subsystem |
|
Use Scenario: Regulates 5 V supply for transmission solenoid drivers and position sensor interfaces in automatic gearbox controllers operating near hot exhaust components. IC Role / Device Role / Timing Role: High-temperature LDO with thermal foldback; maintains regulation up to +125°C ambient while limiting die temperature. Use Value: Sustains operation during extended high-load gear shifts without thermal shutdown, avoiding transmission fault codes. |
Use Scenario: Provides clean 5 V bias to radar processor peripherals and camera interface logic in front-end ADAS domain controllers. IC Role / Device Role / Timing Role: EMI-resilient power supervisor; prevents false resets during high-power RF emissions from adjacent 77 GHz radar modules. Use Value: Maintains system uptime during simultaneous radar transmit and MCU boot, critical for ASIL-B functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO regulator with reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73350PDBVR | 300 mA output, 400 mV dropout at 300 mA, no integrated reset; requires external reset IC and TVS. | Lacks delayed reset and transient protection; suitable only for non-safety-critical interior modules with clean power rails. | Select when cost sensitivity outweighs integration needs and environmental stress is low (e.g., infotainment USB hub). |
| TLE42744DV33 | Adjustable output (3.3 V/5 V variants), 400 mA, integrated watchdog timer, but no programmable reset delay. | Fixed 3.3 V version available; lacks user-tunable reset timeout-relies on internal 200 ms default, limiting boot flexibility. | Choose for systems requiring watchdog supervision alongside regulation, where fixed reset timing suffices and 3.3 V is preferred. |
Compared with TLV73350PDBVR and TLE42744DV33, the LM9071S/NOPB uniquely combines automotive-grade transient immunity, programmable reset delay, and reverse-battery protection in a single TO-263 package-enabling simplified, ASIL-compliant power architecture for engine and transmission ECUs without external protection components.
Availability
LM9071S/NOPB is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS domain controllers requiring stable component supply across extended automotive temperature ranges and long product lifecycles.
Supply support for LM9071S/NOPB 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, embedded processing, and connectivity solutions with deep automotive qualification expertise and AEC-Q100-compliant manufacturing.
The LM9071S/NOPB belongs to TI's automotive power management portfolio, designed specifically for fail-safe microprocessor power supply in harsh-temperature, high-transient engine and chassis control applications.
FAQ
What is the maximum input voltage the LM9071S/NOPB can withstand during load dump events?
The LM9071S/NOPB supports +60 V input transients for durations up to 100 ms without damage or regulation loss, satisfying ISO 7637-2 Pulse 1 and Pulse 2a requirements. This eliminates the need for external TVS diodes in most automotive load-dump scenarios. The device remains fully functional during and after such events, maintaining regulated 5 V output to connected microcontrollers and sensors. This capability is intrinsic to the LM9071S/NOPB silicon design and verified in production testing.
How is the reset delay time calculated for the LM9071S/NOPB?
The LM9071S/NOPB reset delay time tDELAY is determined by the external capacitor CDELAY connected to Pin 5 and the internal charging current (10–30 µA). Using the typical 20 µA value, tDELAY ≈ CDELAY × 50 kΩ - for example, a 0.1 µF capacitor yields 7.6–35 ms delay. The LM9071S/NOPB datasheet provides Figure 12 showing measured delay vs. temperature, confirming design margin across −40°C to +125°C. This equation applies directly to the LM9071S/NOPB and is validated in TI's SNVS131D characterization data.
Does the LM9071S/NOPB require an input capacitor, and what value is recommended?
Yes, the LM9071S/NOPB requires a minimum 1 µF input capacitor placed close to Pins 1 (IN) and 2 (GND) to suppress line transients and improve noise rejection. A ceramic capacitor is preferred for low ESR and ESL. While 1 µF meets minimum stability requirements, TI recommends ≥4.7 µF for enhanced performance in high-noise automotive environments. This input capacitor is mandatory for reliable operation of the LM9071S/NOPB under fast-rising input conditions and helps prevent instability caused by wiring inductance.
Can the LM9071S/NOPB operate with a 5.5 V input supply?
No-the LM9071S/NOPB has a minimum operating input voltage of 6 V per its Absolute Maximum Ratings and Electrical Characteristics tables. At 5.5 V, the device enters dropout and cannot maintain 5 V output regulation at any load. Its specified dropout voltage is ≤800 mV at 250 mA, meaning it requires ≥5.8 V input to sustain full-load regulation. Attempting to operate the LM9071S/NOPB below 6 V risks undervoltage reset assertion and unregulated output, violating its guaranteed performance envelope.
What is the thermal resistance (θJ-A) of the LM9071S/NOPB in its TO-263 package?
The LM9071S/NOPB in TO-263 (KTT) package has a baseline θJ-A of 80°C/W under still-air conditions with no added heatsink. However, this value improves significantly with PCB copper area: 0.5 in² reduces it to 50°C/W, 1.0 in² to 37°C/W, and 1.6 in² to 32°C/W (1 oz copper, no solder mask). These thermal metrics are measured and published in the LM9071S/NOPB datasheet Section 6.5 and directly inform board layout decisions for sustained 250 mA operation at +125°C ambient.
LM9071S/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.8V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 4 mA
- Current - Supply (Max):
- 50 mA
- PSRR:
- 60dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Over Voltage, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM9071S/NOPB FAQ
1.How can I place an order for LM9071S/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM9071S/NOPB 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 LM9071S/NOPB reliable?
The price and inventory of LM9071S/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM9071S/NOPB is usually 5 days.
3.What payment methods are accepted for LM9071S/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM9071S/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM9071S/NOPB?
LM9071S/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM9071S/NOPB 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 LM9071S/NOPB?
For technical support, including LM9071S/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM9071S/NOPB requirements.
6.How does Aetrix verify that LM9071S/NOPB is sourced from the original manufacturer or authorized distributors?
All LM9071S/NOPB 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 LM9071S/NOPB meets industry standards.
7.What is the process for return or replacement of LM9071S/NOPB?
All LM9071S/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM9071S/NOPB, 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 LM9071S/NOPB part is unused and in its original packaging.
Return procedure for LM9071S/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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