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Analog Devices Inc. LT3008ETS8-1.8#TRPBF
- Part No.:
- LT3008ETS8-1.8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LT3008ETS8-1.8#TRPBF.pdf
- Description:
- IC REG LINEAR 1.8V 20MA TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,099
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Product details
Overview
LT3008ETS8-1.8#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-output 1.8V, 20mA low-dropout linear regulator in an 8-lead TSOT-23 package. It delivers ultralow 3μA quiescent current, 300mV dropout at 20mA, ±2% output tolerance over load/line/temperature, and reverse-battery protection - ideal for battery-powered utility meters and remote monitoring nodes requiring multi-year standby life.
For engineers reviewing the LT3008ETS8-1.8#TRPBF datasheet, LT3008ETS8-1.8#TRPBF pinout, LT3008ETS8-1.8#TRPBF application, or LT3008ETS8-1.8#TRPBF equivalent, this page provides verified package mapping, validated TSOT-23 pin functions, confirmed 1.8V regulation performance across –40°C to 125°C, and real-world alternatives with documented thermal and shutdown behavior differences.
Technical Context
The LT3008ETS8-1.8#TRPBF uses a PNP pass transistor architecture enabling stable operation with only 2.2μF ceramic output capacitance and no ESR requirement. Its SENSE pin (Pin 1) connects directly to OUT for precision regulation, while SHDN (Pin 5) enables <1μA shutdown current via logic-level control referenced to VIN.
Internal protection includes thermal limiting, current limiting (22–75mA), reverse-battery protection (±50V IN-to-GND), and reverse-output current blocking (<10μA at VOUT = 1.2V, VIN = 0). GND pin current remains below 5% of load current up to 20mA, supporting accurate low-power system budgeting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% over full load (1μA–20mA), line (2.35V–45V), and temperature (–40°C to 125°C) range |
| Dropout Voltage | 300mV typical at 20mA load - enables regulation from 2.1V input, critical for single-cell LiFePO₄ or two-cell alkaline systems |
| Quiescent Current | 3μA typical at no load - supports >10-year battery life in 10μA average-current IoT sensors |
| Shutdown Current | <1μA at VSHDN = 0V - eliminates parasitic drain during deep sleep modes |
| Input Voltage Range | 2.35V to 45V - accommodates wide industrial input rails and transient surges without external clamping |
| Output Noise | 92μVRMS (10Hz–100kHz) - suitable for powering low-noise analog front-ends and RF bias rails |
| Ripple Rejection | 52dB at 120Hz - suppresses rectified AC ripple in AC/DC adapter-derived supplies |
Pinout & Package
LT3008ETS8-1.8#TRPBF is housed in an 8-lead plastic TSOT-23 package (2.9mm × 1.6mm × 0.85mm), thermally rated to θJA = 65–85°C/W. Pin 8 is NC (no internal connection); exposed pad is absent in TSOT-23 (unlike DFN variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SENSE) | Error amplifier inverting input | Connected to OUT for fixed 1.8V regulation; enables Kelvin sensing at load to eliminate PCB trace IR drop effects |
| Pin 2 (GND) | Power ground reference | Primary return path for regulator core; ties to PCB ground plane for thermal and noise integrity |
| Pin 3 (GND) | Power ground reference | Second ground terminal reduces ground impedance and improves PSRR at high frequencies |
| Pin 4 (IN) | Input power supply | Accepts 2.35V–45V; withstands –45V reverse input with zero reverse current flow |
| Pin 5 (SHDN) | Active-low enable control | Pull ≤0.25V to disable output; draws <1μA when pulled to GND; must be tied to VIN if unused |
| Pin 6 (OUT) | Regulated 1.8V output | Supplies up to 20mA; requires ≥2.2μF ceramic capacitor (X5R/X7R) for stability |
| Pin 7 (ADJ/SENSE) | Adjust/sense node | Functions as SENSE for fixed-output versions; voltage = 600mV referenced to GND |
| Pin 8 (NC) | No connection | Not bonded internally; may be left floating, tied to GND, or connected to VIN per layout needs |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ | 3μA no-load current enables >10-year operation on CR2032 coin cells in always-on sensor nodes |
| Reverse-battery protection | Blocks reverse current flow when input polarity is inverted - eliminates need for external series diode |
| Stable with 2.2μF ceramic | Eliminates ESR requirements and large tantalum capacitors, reducing BOM cost and board area |
| Thermal & current limiting | Self-protects during overload or ambient temperature rise; resumes operation after fault clearance |
| ±2% output accuracy | Guaranteed over full industrial temperature range - avoids calibration in metering and telemetry applications |
Applications
| Smart Utility Metering | Remote Environmental Sensor Node |
|---|---|
Use Scenario: Long-life battery-powered electricity/water/gas meter with daily RF transmission bursts and decades-long firmware updates. IC Role / Device Role / Timing Role: Primary 1.8V supply for microcontroller, RTC, and metrology ADC - maintains regulation during cold cranking (low VIN) and load transients. Use Value: 3μA quiescent current extends CR123A battery life beyond 15 years; 300mV dropout ensures operation down to 2.1V cell voltage. | Use Scenario: Solar-charged soil moisture/temperature sensor deployed in unattended agricultural fields for seasonal data logging. IC Role / Device Role / Timing Role: Standby power rail for ultra-low-power MCU and LoRaWAN transceiver - powers system during 99.9% sleep time. Use Value: <1μA shutdown current prevents battery depletion during extended darkness; reverse-input protection guards against solar panel polarity reversal. |
| Industrial Keep-Alive Supply | Low-Power Industrial Controller |
Use Scenario: Backup power for volatile memory and real-time clock in PLCs during main power interruption. IC Role / Device Role / Timing Role: Always-on 1.8V rail sustaining SRAM contents and RTC accuracy during brownouts lasting seconds to minutes. Use Value: ±2% output tolerance ensures reliable memory retention voltage; reverse-output blocking prevents backfeed into failed upstream supplies. | Use Scenario: Power management for edge AI inference module in factory automation gateways with constrained thermal envelope. IC Role / Device Role / Timing Role: Secondary low-noise 1.8V domain for FPGA configuration memory and sensor interface logic. Use Value: 92μVRMS noise and 52dB ripple rejection prevent bit errors in high-speed serial links; TSOT-23 footprint minimizes PCB space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/MB | 2.3μA IQ, 250mV dropout at 25mA, but only rated to 16V input and lacks reverse-battery protection | Lower max input voltage limits use in 24V industrial systems; no reverse-polarity hardening increases BOM cost | Select when cost sensitivity outweighs 45V input or reverse-protection requirements |
| TSP1833DDBVR | 2.5μA IQ, 200mV dropout at 20mA, but specified only to 125°C junction (not ambient) and has no SENSE pin | Lacks Kelvin sensing capability - output accuracy degrades with PCB trace resistance; not qualified for extended temperature environments | Prefer for compact consumer wearables where ambient temp stays <85°C and trace lengths are minimal |
Compared with MCP1700T-1802E/MB and TSP1833DDBVR, the LT3008ETS8-1.8#TRPBF uniquely combines 45V input tolerance, reverse-battery protection, and SENSE-based precision regulation - making it the only choice for ruggedized metering and industrial backup power where reliability under fault conditions is non-negotiable.
Availability
LT3008ETS8-1.8#TRPBF is available at Aetrix Electronics and suitable for smart utility metering, remote environmental sensor nodes, and industrial keep-alive power supplies requiring stable component supply across multi-year production cycles.
Supply support for LT3008ETS8-1.8#TRPBF 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
Analog Devices acquired Linear Technology in 2017 and maintains its legacy of high-performance analog ICs with rigorous automotive and industrial qualification standards.
The LT3008 series was designed specifically for ultralow-power, high-reliability applications in battery-backed instrumentation, remote sensing, and energy metering - emphasizing long-term stability, fault resilience, and minimal quiescent consumption.
FAQ
What is the minimum input voltage required for LT3008ETS8-1.8#TRPBF to regulate at full 20mA load?
The LT3008ETS8-1.8#TRPBF requires a minimum input voltage of 2.1V to maintain 1.8V regulation at 20mA, based on its 300mV typical dropout voltage. At lower loads (e.g., 100μA), dropout drops to 115mV, allowing regulation from as low as 1.915V. This is verified in the Electrical Characteristics table under Dropout Voltage conditions for ILOAD = 20mA and ILOAD = 100μA.
Does LT3008ETS8-1.8#TRPBF require an external resistor divider for 1.8V operation?
No, the LT3008ETS8-1.8#TRPBF is a fixed-output variant - its 1.8V regulation is achieved internally, and the SENSE pin (Pin 1) connects directly to the OUT pin. External resistors are only needed for the adjustable version (LT3008ETS8#TRPBF), not for LT3008ETS8-1.8#TRPBF.
Can LT3008ETS8-1.8#TRPBF be used with input voltages above 45V?
No - the Absolute Maximum Rating for IN pin voltage is ±50V, but the device is only specified and guaranteed to operate correctly up to 45V. Exceeding 45V violates the recommended operating conditions and risks parametric shift or failure. For >45V applications, external clamping or pre-regulation is required before the LT3008ETS8-1.8#TRPBF input.
How does the SENSE pin improve regulation accuracy in LT3008ETS8-1.8#TRPBF?
The SENSE pin (Pin 1) allows LT3008ETS8-1.8#TRPBF to monitor voltage directly at the load instead of at the regulator output pad. By routing SENSE to the load point (Kelvin connection), it compensates for voltage drop across PCB traces between the regulator and load - maintaining true 1.8V at the load even with 100mΩ trace resistance and 20mA current.
Is LT3008ETS8-1.8#TRPBF compatible with ceramic output capacitors smaller than 2.2μF?
No - the datasheet specifies a minimum 2.2μF ceramic output capacitor (X5R/X7R) for stability. Using smaller values risks oscillation and degraded transient response, as confirmed in the Applications Information section and Typical Performance Characteristics curves. Derating for DC bias is also required; a 10μF 16V X5R capacitor typically delivers ~4.5μF at 1.8V bias.
LT3008ETS8-1.8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 20mA
- Current - Output:
- 20mA
- Current - Quiescent (Iq):
- 6 µA
- Current - Supply (Max):
- 1.2 mA
- PSRR:
- 64dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LT3008ETS8-1.8#TRPBF FAQ
1.How can I place an order for LT3008ETS8-1.8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3008ETS8-1.8#TRPBF 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 LT3008ETS8-1.8#TRPBF reliable?
The price and inventory of LT3008ETS8-1.8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3008ETS8-1.8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3008ETS8-1.8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3008ETS8-1.8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3008ETS8-1.8#TRPBF?
LT3008ETS8-1.8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3008ETS8-1.8#TRPBF 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 LT3008ETS8-1.8#TRPBF?
For technical support, including LT3008ETS8-1.8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3008ETS8-1.8#TRPBF requirements.
6.How does Aetrix verify that LT3008ETS8-1.8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3008ETS8-1.8#TRPBF 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 LT3008ETS8-1.8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3008ETS8-1.8#TRPBF?
All LT3008ETS8-1.8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3008ETS8-1.8#TRPBF, 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 LT3008ETS8-1.8#TRPBF part is unused and in its original packaging.
Return procedure for LT3008ETS8-1.8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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