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Analog Devices Inc. LT1461ACS8-3.3#TRPBF
- Part No.:
- LT1461ACS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1461ACS8-3.3#TRPBF.pdf
- Description:
- IC VREF SERIES 0.04% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,551
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Product details
Overview
LT1461ACS8-3.3#TRPBF from Analog Devices is a micropower precision low-dropout series voltage reference delivering 3.3V output with ±0.04% initial accuracy, 3ppm/°C max temperature coefficient, 35µA supply current, 50mA output drive, and <300mV dropout at full load-used in high-resolution ADC/DAC biasing, portable instrumentation, and precision regulator feedback paths.
For engineers reviewing the LT1461ACS8-3.3#TRPBF datasheet, LT1461ACS8-3.3#TRPBF pinout, LT1461ACS8-3.3#TRPBF application, or LT1461ACS8-3.3#TRPBF equivalent, key selection criteria include guaranteed 0°C to 70°C operation, SO-8 package thermal performance, shutdown control interface, and compatibility with 2µF output capacitance for stability in battery-powered systems.
Technical Context
The LT1461ACS8-3.3#TRPBF employs curvature-compensated bandgap architecture with trimmed thin-film resistors to achieve its 3ppm/°C tempco and 0.04% initial accuracy. Its internal thermal shutdown activates at ~150°C junction temperature, protecting against overload-induced drift.
It features active shutdown control (Pin 3), drawing ≤35µA in shutdown mode while maintaining full 50mA sourcing capability when enabled. Load regulation is specified at 12ppm/mA (typical), and line regulation is ≤8ppm/V across 0.5V–20V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±0.04% (±1.32mV) - enables direct interface with 3.3V logic and ADC reference inputs without scaling. |
| Tempco | 3ppm/°C max - ensures ≤0.99mV drift over 0°C–70°C ambient, critical for 16-bit system accuracy. |
| Supply Current | 35µA typ - supports multi-year battery life in handheld meters and IoT sensor nodes. |
| Dropout Voltage | ≤300mV at 50mA - allows operation from single-cell Li-ion (3.0V min) while sustaining full reference performance. |
| Output Drive | 50mA min - drives precision op-amp buffers, DAC reference inputs, and series-pass transistor bases directly. |
| Shutdown Current | ≤35µA - enables system-level power gating without external switches or leakage concerns. |
| Noise (0.1–10Hz) | 8ppmP-P (26.4µVP-P) - contributes <0.001% error in 16-bit (65536 LSB) conversions. |
Pinout & Package
LT1461ACS8-3.3#TRPBF is housed in an 8-lead plastic SO (SO-8) package with θJA = 190°C/W and maximum junction temperature of 150°C. Pin 1 is located at the top-left corner adjacent to the package notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Reference ground return; must be connected to low-impedance analog ground plane to minimize noise coupling. |
| 2 | VIN | Input supply pin; requires ≥0.5V headroom above VOUT and accepts up to 20V; bypass with 1µF ceramic capacitor. |
| 3 | SHDN | Active-low shutdown control; logic low (<0.8V) disables output and reduces supply current to ≤35µA. |
| 4–5, 7–8 | DNC | Do Not Connect - internally unused; must remain floating or grounded per layout guidelines to avoid parasitic coupling. |
| 6 | VOUT | Regulated 3.3V output; requires ≥2µF ceramic output capacitor for stability under 50mA load steps. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-compensated bandgap | Enables 3ppm/°C tempco without external trimming, reducing calibration overhead in production test. |
| Trimmed thin-film resistors | Deliver 0.04% initial accuracy - eliminates need for post-package laser trimming in most applications. |
| Thermal shutdown protection | Activates at ~150°C junction temperature, preventing permanent parametric shift during transient overloads. |
| Low dropout design | Maintains regulation down to VIN = VOUT + 0.3V - extends usable battery voltage range by >15% vs standard references. |
| High output current | Sources 50mA continuously - eliminates external buffer stages in precision regulator feedback loops. |
Applications
| Portable Multimeter Reference | Industrial 4–20mA Transmitter |
|---|---|
Use Scenario: Battery-powered handheld multimeter requiring stable 3.3V reference for 16-bit SAR ADC and LCD bias generation. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and display driver circuitry. Use Value: 35µA supply current extends alkaline battery life beyond 1000 hours; 3ppm/°C tempco ensures <1LSB error across operating temperature range. | Use Scenario: Loop-powered 4–20mA transmitter in factory automation, operating from 12–36V supply with isolated analog front-end. IC Role / Device Role / Timing Role: Precision reference for current-sense amplifier gain setting and DAC output scaling. Use Value: 50mA output drive directly biases op-amps and transistors in the signal path; <300mV dropout enables regulation from minimal loop voltage headroom. |
| Medical ECG Signal Chain | Automotive Cabin Controller |
Use Scenario: Low-noise ECG front-end with 24-bit delta-sigma ADC, where reference stability directly impacts common-mode rejection. IC Role / Device Role / Timing Role: Reference source for programmable-gain instrumentation amplifier and ADC reference input. Use Value: 8ppmP-P (0.1Hz–10Hz) noise contributes <0.001% error floor; shutdown mode reduces standby power during sleep cycles. | Use Scenario: Infotainment control module requiring AEC-Q100-compliant reference for microcontroller ADC and sensor interface. IC Role / Device Role / Timing Role: System-level voltage reference for MCU internal ADC and external temperature/humidity sensors. Use Value: Qualified for 0°C to 70°C commercial grade; same die as AEC-Q100 versions (e.g., LT1461DHS8-3.3#WTRPBF), enabling scalable qualification paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3333AIDBVR | 3.3V, 30ppm/°C max, 4µA supply current, 5mA output drive, SOT-23-5 package | Limited to low-power, low-drive applications; unsuitable for precision regulators or high-current buffering | Select when ultra-low quiescent current dominates over accuracy and drive capability |
| ADR3433ARJZ-R7 | 3.3V, 10ppm/°C max, 120µA supply current, 15mA output drive, SOT-23-6 package | Higher supply current and lower output drive; no shutdown pin | Select when tighter tempco is required but shutdown control and 50mA drive are not needed |
Compared with REF3333AIDBVR and ADR3433ARJZ-R7, the LT1461ACS8-3.3#TRPBF provides superior initial accuracy (0.04% vs ≥0.1%), higher output drive (50mA vs ≤15mA), and integrated shutdown-making it optimal for precision regulator feedback and portable instrumentation where both low power and high fidelity are required.
Availability
LT1461ACS8-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial 4–20mA transmitters, and medical ECG signal chains requiring stable component supply with traceable lot history and consistent parametric performance.
Supply support for LT1461ACS8-3.3#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1461 family was designed specifically for precision measurement and data acquisition systems demanding micropower operation, low drift, and robust output drive-targeting applications where reference stability directly determines system resolution.
FAQ
What is the maximum input voltage for LT1461ACS8-3.3#TRPBF?
The absolute maximum input voltage for LT1461ACS8-3.3#TRPBF is 20V. Operation above this level risks permanent damage. For reliable long-term use, VIN should remain ≤20V and maintain at least 0.5V headroom above VOUT (i.e., ≥3.8V) under all conditions, as specified in the Electrical Characteristics table.
Does LT1461ACS8-3.3#TRPBF require external capacitors?
Yes, LT1461ACS8-3.3#TRPBF requires both input and output capacitors for stability. A 1µF ceramic capacitor on VIN and a minimum 2µF ceramic capacitor on VOUT are mandatory per the Applications Information section. Omitting the output capacitor causes instability and excessive noise, especially under dynamic load conditions.
What is the guaranteed operating temperature range for LT1461ACS8-3.3#TRPBF?
LT1461ACS8-3.3#TRPBF is specified for 0°C to 70°C operation (Commercial grade). While the device remains functional from –40°C to 125°C per Absolute Maximum Ratings, only parameters tested and guaranteed within 0°C to 70°C are valid for production design-such as 0.04% initial accuracy and 3ppm/°C tempco.
How does the shutdown feature work on LT1461ACS8-3.3#TRPBF?
The shutdown pin (Pin 3) is active-low. Driving it below 0.8V disables the output and reduces supply current to ≤35µA. The part resumes normal operation within ~200µs after SHDN rises above 2.4V. During shutdown, VOUT is high-impedance-not actively pulled low-so external pull-down may be needed if zero-voltage output is required.
Can LT1461ACS8-3.3#TRPBF drive a 50mA load continuously?
Yes, LT1461ACS8-3.3#TRPBF is rated for continuous 50mA sourcing under specified thermal conditions. However, power dissipation (PD = (VIN – 3.3V) × 50mA) must be managed: at VIN = 5.3V, PD = 100mW, resulting in ~19°C junction rise in SO-8. Higher VIN or ambient temperature requires derating or heatsinking to stay below 150°C junction limit.
LT1461ACS8-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 100 mA
- Tolerance:
- ±0.04%
- Temperature Coefficient:
- 3ppm/°C
- Noise - 0.1Hz to 10Hz:
- 8ppmp-p
- Noise - 10Hz to 10kHz:
- 9.6ppmrms
- Voltage - Input:
- 3.8V ~ 20V
- Current - Supply:
- 70µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1461ACS8-3.3#TRPBF FAQ
1.How can I place an order for LT1461ACS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1461ACS8-3.3#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 LT1461ACS8-3.3#TRPBF reliable?
The price and inventory of LT1461ACS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1461ACS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1461ACS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1461ACS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1461ACS8-3.3#TRPBF?
LT1461ACS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1461ACS8-3.3#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 LT1461ACS8-3.3#TRPBF?
For technical support, including LT1461ACS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1461ACS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LT1461ACS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1461ACS8-3.3#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 LT1461ACS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1461ACS8-3.3#TRPBF?
All LT1461ACS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1461ACS8-3.3#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 LT1461ACS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT1461ACS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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