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Analog Devices Inc. LT1461CIS8-3.3#TRPBF
- Part No.:
- LT1461CIS8-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1461CIS8-3.3#TRPBF.pdf
- Description:
- IC VREF SERIES 0.08% 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1461CIS8-3.3#TRPBF from Analog Devices is a micropower precision low-dropout series voltage reference delivering 3.3V output with ±0.08% initial accuracy, 12ppm/°C max temperature coefficient, 35µA supply current, 50mA output drive, and <300mV dropout at 50mA - used in high-resolution ADC/DAC biasing, portable instrument power rails, and precision regulator feedback paths.
For engineers reviewing the LT1461CIS8-3.3#TRPBF datasheet, LT1461CIS8-3.3#TRPBF pinout, LT1461CIS8-3.3#TRPBF application, or LT1461CIS8-3.3#TRPBF equivalent, key selection criteria include guaranteed –40°C to +85°C operation, shutdown control via Pin 3, thermal hysteresis ≤75ppm over –40°C to +85°C, and SO-8 package compatibility with standard PCB layout practices for stress-sensitive references.
Technical Context
The LT1461CIS8-3.3#TRPBF implements curvature-compensated bandgap architecture with trimmed thin-film resistors for stable 3.3V output across temperature. Its internal shutdown circuit enables full-load current switching with ≤35µA quiescent current in disabled state.
It features active thermal limiting (TJMAX = 150°C), load regulation of 12ppm/mA (0–50mA), line regulation ≤12ppm/V (VOUT+0.5V ≤ VIN ≤ 20V), and output noise of 8ppmP-P (0.1Hz–10Hz), making it suitable for 14-bit+ data acquisition systems where reference stability dominates total error budget.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±0.08% (±2.64mV) at 25°C - ensures direct compatibility with 3.3V logic and ADC reference inputs without trimming. |
| Tempco | 12ppm/°C max over –40°C to +85°C - contributes ≤1.06mV drift across full industrial range, critical for uncalibrated systems. |
| Supply Current | 35µA typical, 50µA max - enables multi-year battery life in handheld meters and IoT sensor nodes. |
| Dropout Voltage | ≤300mV at 50mA load - allows operation from 3.6V Li-ion cells down to end-of-discharge while maintaining full accuracy. |
| Output Drive | 50mA sourcing capability - supports direct driving of op-amp bias networks, DAC reference inputs, and low-power LDO error amplifiers. |
| Shutdown Control | Logic-compatible SHDN pin (Pin 3): ≤0.8V = active-low disable, ≤35µA shutdown current - enables system-level power gating. |
| Thermal Hysteresis | 75ppm max over –40°C to +85°C cycling - limits post-thermal-cycling offset shift to ≤0.25mV in field-deployed equipment. |
Pinout & Package
LT1461CIS8-3.3#TRPBF uses an 8-lead plastic SO (SO-8) package with θJA = 190°C/W and TJMAX = 150°C. Lead finish is lead-free (Pb-free), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC (No Connect) | Internally unused; must remain unconnected per datasheet - floating or tied to GND degrades long-term stability. |
| 2 | VIN | Input supply pin: accepts 3.6V to 20V; dropout headroom requirement dictates minimum input voltage for regulation. |
| 3 | SHDN | Active-low shutdown control: <0.8V disables output, >2.4V enables; 2–15µA input current enables direct MCU GPIO interfacing. |
| 4 | GND | Analog ground reference: must be connected to clean, low-impedance system ground plane - star-point routing recommended. |
| 5 | NC | No connect - electrically isolated; PCB pad may be omitted or left floating. |
| 6 | VOUT | Regulated 3.3V output: requires ≥2µF ceramic output capacitor for stability under 50mA loads. |
| 7 | NC | No connect - no internal connection; avoid routing traces or vias to this pad. |
| 8 | NC | No connect - unused terminal; do not bond or solder to adjacent traces. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 35µA supply current enables >10-year battery life in always-on sensor transmitters using CR2032 cells. |
| Low thermal hysteresis | 75ppm max over –40°C to +85°C reduces recalibration frequency in outdoor instrumentation exposed to diurnal cycles. |
| High output drive | 50mA sourcing eliminates need for external buffer op-amps in precision regulator feedback loops. |
| Shutdown mode | 35µA shutdown current allows complete system sleep states without sacrificing wake-up speed (<200µs turn-on). |
| Industrial temp grade | Specified from –40°C to +85°C ensures reliable operation in factory automation PLC I/O modules and motor drive control boards. |
Applications
| Portable Multimeter Reference | Precision 16-bit ADC Biasing |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 3.3V reference for autoranging analog front-end and SAR ADC. IC Role / Device Role / Timing Role: Primary voltage reference supplying excitation to precision resistor dividers and ADC VREF input. Use Value: ±0.08% initial accuracy and 12ppm/°C tempco ensure <0.02% measurement error across 0–40°C operating range without factory calibration. | Use Scenario: Industrial data acquisition module digitizing 4–20mA sensor signals with 16-bit resolution. IC Role / Device Role / Timing Role: Low-noise, high-drive reference for successive approximation register (SAR) ADC reference input and PGA bias network. Use Value: 8ppmP-P (0.1–10Hz) noise and 50mA drive eliminate external buffering, reducing BOM count and board area by 30%. |
| Low-Power RTU Power Supply | Programmable Logic Controller (PLC) Analog Output |
Use Scenario: Remote telemetry unit powered by solar-charged LiFePO₄ battery, requiring regulated 3.3V rail for microcontroller and RF transceiver. IC Role / Device Role / Timing Role: Micropower series reference regulating buck converter feedback node and supplying MCU VDD_IO. Use Value: 35µA quiescent current extends battery runtime to >5 years; <300mV dropout enables operation down to 3.4V cell voltage. | Use Scenario: Modular PLC analog output card generating 0–10V or 4–20mA signals with ±0.1% full-scale accuracy. IC Role / Device Role / Timing Role: Precision reference for DAC output amplifier gain-setting network and current-sense resistor bias. Use Value: 12ppm/mA load regulation ensures <0.06% output error across full 20mA range; thermal hysteresis ≤75ppm maintains calibration over seasonal ambient shifts. |
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, ±0.1% initial accuracy, 50ppm/°C max tempco, 6µA supply current, 5mA output drive | Limited to 5mA load - requires external buffer for regulator feedback or high-current DACs | Select when ultra-low power (<10µA) dominates over drive strength and tempco; unsuitable for 50mA applications. |
| ADR4533BRZ | 3.3V, ±0.02% initial accuracy, 3ppm/°C max tempco, 950µA supply current, 10mA output drive | Higher quiescent current and lower drive - incompatible with battery-powered or high-current use cases | Choose for metrology-grade stability where 3ppm/°C tempco justifies 27× higher supply current and cost premium. |
Compared with REF3333AIDBVR and ADR4533BRZ, LT1461CIS8-3.3#TRPBF uniquely balances micropower consumption (35µA), industrial temperature range (–40°C to +85°C), and high output drive (50mA) - enabling single-component solutions in portable instruments and programmable analog outputs without buffers or supplemental regulators.
Availability
LT1461CIS8-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and programmable analog output modules requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LT1461CIS8-3.3#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, Inc. 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 voltage reference applications demanding low drift, micropower operation, and robust thermal performance in space-constrained industrial environments - with LT1461CIS8-3.3#TRPBF targeting cost-sensitive, high-volume industrial systems.
FAQ
What is the maximum load current supported by LT1461CIS8-3.3#TRPBF without violating specifications?
The LT1461CIS8-3.3#TRPBF guarantees 50mA minimum sourcing capability across its specified –40°C to +85°C temperature range. At 50mA, dropout remains ≤300mV and load regulation is bounded at 12ppm/mA (≤0.6mV total shift). Exceeding 50mA risks thermal shutdown activation or increased output error due to die heating.
Does LT1461CIS8-3.3#TRPBF require external capacitors, and if so, what values are mandatory?
Yes - LT1461CIS8-3.3#TRPBF requires both input and output capacitors for stability. A minimum 1µF ceramic capacitor on VIN is recommended (bypass from nearby supplies may suffice), and a minimum 2µF ceramic capacitor on VOUT is mandatory for loads ≥1mA. For 50mA operation, 2µF is the verified minimum; reducing below this risks oscillation and degraded transient response.
How does the shutdown feature of LT1461CIS8-3.3#TRPBF behave during power-down sequences?
When SHDN (Pin 3) is pulled below 0.8V, LT1461CIS8-3.3#TRPBF disables its output and draws ≤35µA supply current. Output voltage decays passively through load; turn-on occurs within 200µs after SHDN rises above 2.4V. No external discharge path is needed, but rapid load transients during wake-up may require local VOUT decoupling.
What is the thermal hysteresis specification for LT1461CIS8-3.3#TRPBF, and how does it impact field calibration?
LT1461CIS8-3.3#TRPBF exhibits ≤75ppm thermal hysteresis over –40°C to +85°C cycling, equivalent to ≤0.25mV shift at 3.3V. This defines the maximum residual offset after ambient temperature excursions - critical for field-calibrated instruments where recalibration intervals exceed seasonal temperature cycles.
Can LT1461CIS8-3.3#TRPBF be used in automotive applications, and what qualification does it hold?
LT1461CIS8-3.3#TRPBF is rated for –40°C to +85°C industrial operation and is not AEC-Q100 qualified. For automotive use, Analog Devices offers the LT1461DHS8-3.3#TRPBF variant (–40°C to +125°C, AEC-Q100 Grade 1), which shares identical electrical specs but undergoes additional automotive reliability testing and controlled manufacturing.
LT1461CIS8-3.3#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:
- ±0.08%
- Temperature Coefficient:
- 12ppm/°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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1461CIS8-3.3#TRPBF FAQ
1.How can I place an order for LT1461CIS8-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1461CIS8-3.3#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 LT1461CIS8-3.3#TRPBF reliable?
The price and inventory of LT1461CIS8-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1461CIS8-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1461CIS8-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1461CIS8-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1461CIS8-3.3#TRPBF?
LT1461CIS8-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1461CIS8-3.3#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 LT1461CIS8-3.3#TRPBF?
For technical support, including LT1461CIS8-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1461CIS8-3.3#TRPBF requirements.
6.How does Aetrix verify that LT1461CIS8-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1461CIS8-3.3#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 LT1461CIS8-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1461CIS8-3.3#TRPBF?
All LT1461CIS8-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1461CIS8-3.3#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 LT1461CIS8-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT1461CIS8-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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