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Analog Devices Inc. LTC1798CS8-2.5#TRPBF
- Part No.:
- LTC1798CS8-2.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1798CS8-2.5#TRPBF.pdf
- Description:
- IC VREF SERIES 0.15% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,239
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Product details
Overview
LTC1798CS8-2.5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, low-dropout, 2.5V fixed-output series voltage reference IC in SO-8 package. It delivers 0.15% initial accuracy, 40ppm/°C max temperature coefficient, and only 4µA typical quiescent current - enabling ultra-long battery life in precision portable instrumentation.
For engineers reviewing the LTC1798CS8-2.5#TRPBF datasheet, LTC1798CS8-2.5#TRPBF pinout, LTC1798CS8-2.5#TRPBF application, or LTC1798CS8-2.5#TRPBF equivalent, key selection criteria include dropout voltage at 10mA load, output stability without bypass capacitor, sourcing/sinking capability, temperature hysteresis, and compatibility with low-voltage supply rails down to 2.7V.
Technical Context
The LTC1798CS8-2.5#TRPBF uses curvature-compensated bandgap architecture with trimmed thin-film resistors to achieve low drift and high DC accuracy. Its internal P-channel MOSFET pass transistor enables 200mV max dropout at 10mA while maintaining ultralow quiescent current across full load and input voltage range.
It operates over 0°C to 70°C, requires no output capacitor for stability (0–1µF supported), and features built-in ESD protection. The device is not adjustable - FB pin is internally connected and unused in this fixed-voltage variant, distinguishing it from the adjustable LTC1798.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V ±0.15% (2.4963V to 2.5037V) - ensures precise ADC/DAC biasing without calibration. |
| Max Dropout Voltage | 200mV at 10mA - allows operation from 2.7V supply in battery-powered systems. |
| Quiescent Current | 4µA typical - extends shelf life and runtime in always-on sensor nodes. |
| Temp Coefficient | 40ppm/°C max - limits output drift to ±1mV over 0°C to 70°C ambient. |
| Load Drive | Sources 10mA / sinks 2mA - supports direct driving of op-amp references or small regulator error amps. |
| Output Noise | 8ppmP-P (0.1Hz–10Hz) - contributes <0.02mV RMS noise to 16-bit+ data converters. |
| Hysteresis | 50ppm over 0°C to 70°C - negligible impact on calibration repeatability in lab-grade instruments. |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150", JEDEC MS-012), RoHS-compliant lead-free finish, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (DNC) | Do Not Connect | Internally trimmed; external connection risks calibration shift or damage. |
| Pin 2 (IN) | Positive Supply Input | Accepts 2.7V to 12.6V; bypass with 0.1µF recommended for dynamic loads. |
| Pin 3 (DNC) | Do Not Connect | Fixed-voltage variant: no feedback function; must remain unconnected. |
| Pin 4 (GND) | Ground Reference | Low-impedance return path; separate analog ground routing improves PSRR. |
| Pin 5 (DNC) | Do Not Connect | Internally connected for post-package trim; floating per datasheet. |
| Pin 6 (OUT) | 2.5V Reference Output | Stable with 0–1µF capacitive load; sources up to 10mA, sinks up to 2mA. |
| Pin 7 (DNC) | Do Not Connect | Internally trimmed node; no external circuitry permitted. |
| Pin 8 (DNC) | Do Not Connect | Internally connected; violation may degrade long-term stability. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables zero-footprint designs and sub-10µs settling in fast-sampling data acquisition. |
| 200mV max dropout at 10mA | Permits use with single-cell Li-ion (3.0V min) or two-cell alkaline (2.7V min) supplies. |
| 4µA quiescent current | Reduces standby power to 10.8µW at 2.7V - critical for multi-year battery life. |
| 0.15% initial accuracy | Eliminates factory trimming in mid-accuracy industrial sensors and handheld meters. |
| Stable with up to 1µF output capacitance | Allows transient suppression in noisy environments without oscillation risk. |
Applications
| Battery-Powered Handheld Instruments | Precision Power Supplies |
|---|---|
Use Scenario: Portable multimeter or pH meter operating from two AA cells with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 2.5V reference for 16-bit SAR ADC and display driver biasing. Use Value: 4µA quiescent current and 200mV dropout enable reliable operation down to 2.7V cell voltage while preserving measurement accuracy. | Use Scenario: Lab-grade bench power supply requiring stable 2.5V reference for DAC-controlled voltage setpoint. IC Role / Device Role / Timing Role: Low-drift series reference feeding op-amp error amplifier in linear regulator feedback loop. Use Value: 40ppm/°C drift and 0.15% accuracy ensure ≤±1.25mV setpoint error across 0–70°C ambient range. |
| A/D and D/A Converters | Supply Splitter Circuits |
Use Scenario: Battery-operated data logger using LTC1096L 12-bit ADC with 0–3V input range. IC Role / Device Role / Timing Role: Reference source for ADC VREF pin and internal comparator thresholds. Use Value: 8ppmP-P low-frequency noise minimizes quantization uncertainty in high-resolution measurements. | Use Scenario: Single-supply op-amp circuit requiring virtual ground at VCC/2 = 2.5V from 5V rail. IC Role / Device Role / Timing Role: Precision 2.5V source replacing resistor divider + buffer for improved PSRR and load regulation. Use Value: 10mA sourcing capability and 0.3mV/mA load regulation maintain virtual ground accuracy under varying op-amp bias currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1460BCS8-2.5#TRPBF | 0.075% initial accuracy, 10ppm/°C max drift, 35µA quiescent current | Higher accuracy and lower drift, but 8.75× higher supply current | Select when long-term stability and ultra-low drift outweigh battery life constraints. |
| LT1634BCS8-2.5#TRPBF | Shunt topology, 0.05% accuracy, 25ppm/°C drift, 60µA operating current | Requires external current-setting resistor; unsuitable for low-input-voltage or high-efficiency designs | Choose only if board space allows shunt configuration and supply voltage exceeds 3.5V. |
Compared with LT1460BCS8-2.5#TRPBF and LT1634BCS8-2.5#TRPBF, the LTC1798CS8-2.5#TRPBF uniquely balances ultra-low quiescent current (4µA), low dropout (200mV), and SO-8 compatibility - making it optimal for space-constrained, battery-sensitive applications where moderate accuracy suffices.
Availability
LTC1798CS8-2.5#TRPBF is available at Aetrix Electronics and suitable for battery-powered handheld instruments, precision power supplies, A/D and D/A converters, and supply splitter circuits requiring stable component supply and long-lifecycle support.
Supply support for LTC1798CS8-2.5#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1798 series was designed specifically for micropower, low-dropout precision reference applications in portable and energy-constrained systems - emphasizing quiescent current efficiency without sacrificing DC accuracy or thermal stability.
FAQ
What is the maximum input voltage rating for the LTC1798CS8-2.5#TRPBF?
The LTC1798CS8-2.5#TRPBF has an absolute maximum input voltage of 12.6V. Operation above this level risks permanent damage. The recommended operating range is 2.7V to 12.6V, with minimum headroom of 200mV above the 2.5V output to maintain regulation. Exceeding 12.6V violates Absolute Maximum Ratings and voids reliability guarantees.
Does the LTC1798CS8-2.5#TRPBF require an output bypass capacitor?
No, the LTC1798CS8-2.5#TRPBF is stable without any output capacitor - a key advantage for space-constrained or fast-settling applications. It remains stable with capacitive loads from 0µF up to 1µF. For loads exceeding 1µF, a series damping resistor (per Figure 2 in the datasheet) is required to prevent ringing.
Can the LTC1798CS8-2.5#TRPBF sink current, and how much?
Yes, the LTC1798CS8-2.5#TRPBF can sink up to 2mA while maintaining output regulation within specification. This capability supports active pull-down in precision comparator circuits or bidirectional reference buffering. Sinking beyond 2mA may cause output voltage deviation exceeding 0.1% or thermal stress under continuous operation.
What is the temperature coefficient specification for the LTC1798CS8-2.5#TRPBF?
The LTC1798CS8-2.5#TRPBF has a maximum temperature coefficient of 40ppm/°C over the 0°C to 70°C operating range. This translates to a worst-case output change of ±1mV across the full temperature span. The typical TC is 15ppm/°C, yielding ±0.525mV drift - verified in production testing per the datasheet's Electrical Characteristics table.
Is the FB pin functional on the LTC1798CS8-2.5#TRPBF?
No - the FB pin (Pin 3) is marked DNC (Do Not Connect) for the LTC1798CS8-2.5#TRPBF. It is internally tied off and serves no feedback function in this fixed-output variant. Connecting external circuitry to Pin 3 violates the datasheet and may compromise output accuracy or long-term stability.
LTC1798CS8-2.5#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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.15%
- Temperature Coefficient:
- 40ppm/°C
- Noise - 0.1Hz to 10Hz:
- 8µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.7V ~ 12.6V
- Current - Supply:
- 8.5µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1798CS8-2.5#TRPBF FAQ
1.How can I place an order for LTC1798CS8-2.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1798CS8-2.5#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 LTC1798CS8-2.5#TRPBF reliable?
The price and inventory of LTC1798CS8-2.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1798CS8-2.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1798CS8-2.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1798CS8-2.5#TRPBF transactions.
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LTC1798CS8-2.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1798CS8-2.5#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 LTC1798CS8-2.5#TRPBF?
For technical support, including LTC1798CS8-2.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1798CS8-2.5#TRPBF requirements.
6.How does Aetrix verify that LTC1798CS8-2.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1798CS8-2.5#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 LTC1798CS8-2.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1798CS8-2.5#TRPBF?
All LTC1798CS8-2.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1798CS8-2.5#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 LTC1798CS8-2.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1798CS8-2.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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