TPS7A47-Q1 Texas Instruments Integrated Circuit (Quad Flat No-Lead) In Stock
Automotive-grade ultralow-noise LDO linear regulator rated at 35 V input and 1 A output, delivering only 4.2 µV RMS output noise for RF and precision analog circuits. AEC-Q100 qualified for automotive and high-reliability applications in a compact QFN package. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Quad Flat No-Lead
- Pin Count
- 21
- Lifecycle
- ACTIVE
- Datasheet
- TPS7A47-Q1 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4.2 µV RMS output noise (10 Hz to 100 kHz) makes this the lowest-noise LDO choice for RF PLLs, VCOs, and precision ADC reference supplies
- 35 V input / 1 A output rating covers automotive 12 V and 24 V battery systems with substantial headroom for load transients
- AEC-Q100 automotive qualification ensures reliable operation from -40°C to +125°C in under-hood and in-cabin vehicle electronics
Applications
The TPS7A47-Q1 is designed for automotive infotainment, ADAS radar front ends, and in-vehicle RF tuner modules where ultralow output noise is critical for signal chain performance. Its 4.2 µV RMS noise floor prevents phase noise degradation in PLL and VCO circuits powered directly from a 12 V automotive battery rail. The device also suits precision industrial ADC and DAC reference supplies in factory automation equipment that requires AEC-Q100 reliability standards.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TPS7A47-Q1:
Adjustable Positive LDO Regulator, 1.4V Min, 34V Max, 0.45V Dropout, BIPolar, PQCC20
Adjustable Positive LDO Regulator, 1.4V Min, 34V Max, 0.45V Dropout, BIPolar, PQCC20
Adjustable Positive LDO Regulator, 1.4V Min, 34V Max, 0.45V Dropout, BIPolar, PQCC20
Adjustable Positive LDO Regulator, 1.4V Min, 34V Max, 0.45V Dropout, BIPolar, PQCC20
Adjustable Positive LDO Regulator, 1.4V Min, 34V Max, 0.45V Dropout, BIPolar, PQCC20
Adjustable Positive LDO Regulator, 1.4V Min, 34V Max, 0.45V Dropout, BIPolar, PQCC20
Frequently Asked Questions
How does the TPS7A47-Q1 achieve ultralow output noise and why does that matter for automotive RF circuits?
The TPS7A47-Q1 uses an internal reference with proprietary noise-reduction filtering, achieving only 4.2 µV RMS output noise from 10 Hz to 100 kHz. In an automotive V2X radio or ADAS radar front end, this low noise floor prevents the LDO supply from degrading the VCO phase noise floor, which directly affects receiver sensitivity and range accuracy at 77 GHz.
What is the maximum input voltage of the TPS7A47-Q1, and can it handle 24 V truck battery systems?
The TPS7A47-Q1 accepts input voltages up to 35 V, which comfortably covers a 24 V commercial vehicle battery including load-dump transients up to 28 V specified in ISO 7637. The 35 V ceiling also provides margin above the 12 V passenger car battery cold-crank and load-dump conditions, making the device suitable across the full automotive voltage spectrum.
What output current does the TPS7A47-Q1 supply, and is it sufficient for an ADAS camera ISP processor at 1.8 V?
The TPS7A47-Q1 delivers up to 1 A continuous output current. A typical ADAS camera ISP such as TI's TDA3x series draws approximately 400 mA to 800 mA on its 1.8 V core rail, well within the 1 A limit. The remaining headroom allows the LDO to supply peripheral IOs on the same rail without exceeding its thermal dissipation limit in an ambient of 85°C.
What temperature range does the TPS7A47-Q1 support, and what qualification standard covers automotive use?
The TPS7A47-Q1 is AEC-Q100 Grade 1 qualified, guaranteeing operation from -40°C to +125°C junction temperature. This range covers engine-bay modules that experience -40°C cold soak in winter and +125°C sustained thermal loads near the exhaust, satisfying Tier-1 automotive supplier requirements without additional derating.
Which package does the TPS7A47-Q1 come in, and how does the package affect thermal management in a space-constrained infotainment PCB?
The device is housed in a Quad Flat No-Lead (QFN) package with an exposed thermal pad that transfers heat directly to PCB copper pours. For a 12 V to 3.3 V conversion at 1 A, the power dissipation is approximately 8.7 W worst-case, but with a 4-layer PCB and 2 cm² copper ground pour, the junction-to-ambient thermal resistance drops below 30°C/W, keeping junction temperature within the 125°C limit at 85°C ambient.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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