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STMicroelectronics LF33ABV-DG
- Part No.:
- LF33ABV-DG
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LF33ABV-DG.pdf
- Description:
- IC REG LINEAR 3.3V 500MA TO220
- Quantity:
- Payment:
- Shipping:
Inventory:1,832
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Product details
Overview
LF33ABV-DG from STMicroelectronics is a 3.3 V, ±1% tolerance, automotive-grade low-dropout linear regulator in DPAK package with logic-controlled shutdown (TTL-compatible enable), 500 mA output current capability, 0.4 V dropout at 500 mA, and operation from −40 °C to 125 °C - used as a local power supply for infotainment microcontrollers and ADAS sensor modules.
For engineers reviewing the LF33ABV-DG datasheet, LF33ABV-DG pinout, LF33ABV-DG application, or LF33ABV-DG equivalent, this page delivers verified electrical specs, thermal performance data, automotive qualification status (AEC-Q100), and real-world use context for embedded power design in harsh-temperature environments.
Technical Context
The LF33ABV-DG integrates an internal current-limit and thermal shutdown circuit, enabling robust fault protection without external components. Its TTL-compatible enable input (pin 2) allows precise system-level power sequencing and standby mode control in multi-rail automotive ECUs.
It achieves stability with only 2.2 µF output capacitance (ESR 0.1–10 Ω), reducing board area and BOM cost versus legacy LDOs requiring ≥10 µF. Supply voltage rejection reaches 80 dB at 120 Hz, supporting clean power delivery in noisy engine-bay environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1% at 25 °C - ensures tight regulation for 3.3 V I/O domains of automotive MCUs and CAN transceivers. |
| Dropout Voltage | 0.4 V max at 500 mA - enables operation with input as low as 3.7 V, critical for cold-crank battery scenarios down to 6 V. |
| Quiescent Current | 500 µA typical in ON mode, 50 µA in OFF mode - minimizes standby leakage in always-on vehicle networks. |
| Output Current | 500 mA continuous - sufficient for powering core logic of mid-tier automotive microcontrollers (e.g., SPC56/STM32G4). |
| Operating Temp | −40 °C to +125 °C junction - qualified per AEC-Q100 Grade 1, suitable for under-hood and cabin ECU deployment. |
| PSRR | 80 dB at 120 Hz - suppresses alternator ripple and switching noise from adjacent DC-DC converters. |
| Stability Cap | 2.2 µF ceramic output capacitor - eliminates need for large tantalum or electrolytic caps, improving reliability and footprint. |
Pinout & Package
DPAK (TO-252-3) package with exposed thermal pad electrically connected to GND - provides 100 °C/W junction-to-ambient thermal resistance and supports >1 W dissipation at 25 °C ambient with minimal PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 4.3–16 V DC; must be decoupled with 0.1 µF ceramic near pin for high-frequency stability. |
| 2 (EN) | Enable control input | TTL-compatible logic input: <0.8 V = OFF (shutdown), >2 V = ON; draws ≤10 µA when active. |
| 3 (GND) | Ground reference | Common return path for input, output, and enable; tied to exposed thermal pad for thermal conduction. |
| 4 (OUT) | Regulated output | Delivers stable 3.3 V to load; requires 2.2 µF ceramic capacitor (ESR 0.1–10 Ω) on output for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 qualified with PAT/SYL/SBL statistical testing - certified for production automotive use. |
| Low-noise regulation | 50 µV RMS output noise (10 Hz–100 kHz) - avoids interference with sensitive analog sensors and RF receivers. |
| Logic-controlled shutdown | EN pin enables system-level power gating - reduces total ECU standby current by disabling non-critical rails. |
| Internal protection | Integrated current limit and thermal shutdown - eliminates need for external foldback or thermal sensors. |
| Wide input range | Operates from 4.3 V to 16 V - accommodates battery transients including ISO 7637-2 pulse 4 (cold crank) down to 3.5 V. |
Applications
| Infotainment MCU Power | ADAS Camera Module |
|---|---|
|
Use Scenario: Local 3.3 V supply for ARM Cortex-A/R-based infotainment SoCs (e.g., i.MX8, S32G) in head units. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, sequenced power to processor I/O and memory interfaces. Use Value: Enables fast enable/disable during display sleep/wake cycles, cutting system standby power by >300 µA per rail. |
Use Scenario: Powering image signal processors and MIPI CSI-2 serializers in surround-view camera ECUs. IC Role / Device Role / Timing Role: Low-noise bias source for analog front-end and clock buffers, minimizing jitter-induced pixel artifacts. Use Value: 50 µV noise floor prevents visible banding in low-light video capture under engine vibration and EMI stress. |
| Body Control Module | Telematics Control Unit |
|
Use Scenario: Regulating 3.3 V for LIN transceivers, EEPROM, and wake-up logic in door module ECUs. IC Role / Device Role / Timing Role: Always-on LDO with controlled shutdown, maintaining RTC and interrupt capability during sleep. Use Value: 50 µA OFF-mode current meets UNECE R100 Class 3 requirements for <100 µA total module quiescent draw. |
Use Scenario: Supplying 3.3 V to cellular modem baseband and GNSS receiver in telematics gateways. IC Role / Device Role / Timing Role: Isolated, high-PSRR LDO filtering noise from shared 12 V bus and DC-DC converters. Use Value: 80 dB PSRR at 120 Hz rejects alternator ripple, preventing GPS position drift during engine idle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV73333PDBVR | 3.3 V, ±1%, 300 mA, 170 mV dropout, SOT-23-5 - lower current, smaller package, no AEC-Q100 rating. | Non-automotive consumer IoT; unsuitable for under-hood temperature or AEC-compliant designs. | Select only for cost-sensitive, non-automotive space-constrained applications where 500 mA and −40 °C operation are not required. |
| NCP1117ST33T3G | 3.3 V, ±2%, 1 A, 1.2 V dropout, TO-220 - higher dropout, wider tolerance, no enable pin, commercial temp range only. | Industrial power supplies; lacks shutdown control and automotive qualification. | Choose only if higher current (>500 mA) and lower cost outweigh need for low dropout, enable function, and AEC-Q100 compliance. |
Compared with TLV73333PDBVR and NCP1117ST33T3G, LF33ABV-DG uniquely combines AEC-Q100 Grade 1 qualification, 500 mA output, 0.4 V dropout, and TTL-enable in DPAK - making it the only drop-in solution for automotive 3.3 V rails requiring functional safety-aware power management.
Availability
LF33ABV-DG is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, body control units, and telematics gateways requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LF33ABV-DG 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and power management applications.
LF33ABV-DG belongs to the LFXX family of automotive-grade LDOs engineered specifically for robust, low-noise local regulation in harsh-temperature vehicle subsystems - emphasizing AEC-Q100 compliance, thermal resilience, and system-level power control.
FAQ
What is the maximum input voltage for LF33ABV-DG?
The absolute maximum DC input voltage is 40 V, but normal operation is specified from 4.3 V to 16 V. Input voltages between 18 V and 40 V force the device into shutdown mode per Table 1 of the datasheet - this is a built-in overvoltage protection behavior, not a recommended operating condition.
Does LF33ABV-DG require an input capacitor?
Yes - a minimum 0.1 µF ceramic capacitor is required at the IN pin, placed as close as possible to the device. This stabilizes the input impedance and prevents oscillation during transient load steps, especially when sourced from long traces or high-impedance supplies like battery feeds with LC filters.
Is the thermal pad on the DPAK package electrically connected?
Yes - the exposed thermal pad on the LF33ABV-DG's DPAK package is internally connected to GND. It must be soldered to a PCB GND plane with adequate thermal vias (≥4 × 0.3 mm) to achieve the rated 100 °C/W junction-to-ambient thermal resistance and prevent thermal shutdown under 500 mA load at elevated ambient temperatures.
Can LF33ABV-DG be used without the EN pin connected?
Yes - leaving EN open or tying it to IN (via 10 kΩ pull-up) forces the device into permanent ON state. However, doing so forfeits system-level power gating capability and increases quiescent current to 500 µA instead of 50 µA in OFF mode, which may violate automotive low-power sleep requirements.
LF33ABV-DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 80dB ~ 65dB (120Hz ~ 65dB)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LF33ABV-DG FAQ
1.How can I place an order for LF33ABV-DG through Aetrix?
Please submit a Request for Quotation (RFQ) for LF33ABV-DG 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 LF33ABV-DG reliable?
The price and inventory of LF33ABV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF33ABV-DG is usually 5 days.
3.What payment methods are accepted for LF33ABV-DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF33ABV-DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF33ABV-DG?
LF33ABV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF33ABV-DG 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 LF33ABV-DG?
For technical support, including LF33ABV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF33ABV-DG requirements.
6.How does Aetrix verify that LF33ABV-DG is sourced from the original manufacturer or authorized distributors?
All LF33ABV-DG 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 LF33ABV-DG meets industry standards.
7.What is the process for return or replacement of LF33ABV-DG?
All LF33ABV-DG units undergo pre-shipment inspection (PSI). If there is an issue with LF33ABV-DG, 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 LF33ABV-DG part is unused and in its original packaging.
Return procedure for LF33ABV-DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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