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Analog Devices Inc. LT6660HCDC-2.5
- Part No.:
- LT6660HCDC-2.5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 3-WFDFN Exposed Pad
- Datasheet:
-
LT6660HCDC-2.5.pdf
- Description:
- IC VREF SERIES 0.2% 3DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,963
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Product details
Overview
LT6660HCDC-2.5 from Analog Devices (formerly Linear Technology) is a micropower, precision series voltage reference delivering 2.5V output with ±0.2% initial accuracy, 20ppm/°C max temperature coefficient, and guaranteed 20mA sourcing capability in a 3-lead 2mm × 2mm DFN package. It operates from VIN = VOUT + 0.9V (≥3.4V) to 20V, requires no output capacitor, and features reverse-battery protection - ideal for battery-powered handheld instruments and precision ADC/DAC biasing.
For engineers reviewing the LT6660HCDC-2.5 datasheet, LT6660HCDC-2.5 pinout, LT6660HCDC-2.5 application, or LT6660HCDC-2.5 equivalent, key selection criteria include its 115–175µA supply current, 0.9V dropout voltage at zero load, 1000ppm/mA load regulation at 100µA, 150ppm/V line regulation over VOUT + 0.9V to VOUT + 2.5V, and 4ppm P-P (0.1Hz–10Hz) output noise - all critical for low-drift, space-constrained analog signal chains.
Technical Context
The LT6660HCDC-2.5 uses curvature-compensated bandgap architecture and laser-trimmed thin-film resistors to achieve low drift and high accuracy without external compensation. Its series topology eliminates idle current waste inherent in shunt references, enabling dynamic power scaling as load varies.
It integrates reverse-battery protection and exhibits low thermal hysteresis (≤50ppm over 0°C to 70°C), with thermal regulation specified at 2.5ppm/mW. The device maintains stability with 0µF output capacitance, supporting fast settling and intrinsic safety designs where minimal total capacitance is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V ±0.2% (±5mV) at 25°C - enables 8-bit absolute accuracy over 0°C to 70°C without system calibration |
| Temp Coefficient | 20ppm/°C max (≤140ppm over 0°C to 70°C) - ensures ≤0.35mV drift across industrial temperature range |
| Supply Current | 115µA (min), 175µA (max) - supports >10-year battery life in µA-level standby systems |
| Dropout Voltage | 0.9V at IOUT = 0; 1.3V at IOUT = 10mA - allows operation from 3.4V input, compatible with single Li-ion or dual alkaline supplies |
| Load Regulation | 1000ppm/mA at 100µA load (±0.04%); 20ppm/mA at 20mA load - maintains tight output under varying sensor/ADC loading |
| Line Regulation | 150ppm/V (typ) for VIN = VOUT + 0.9V to VOUT + 2.5V - rejects ripple and variation in unregulated input rails |
| Output Noise | 4ppm P-P (0.1Hz–10Hz), 4ppm RMS (10Hz–1kHz) - contributes <1µV noise to 16-bit+ data acquisition front-ends |
| Abs Max Input | 30V - withstands transient surges in industrial power supply interfaces |
Pinout & Package
LT6660HCDC-2.5 is housed in a 3-lead plastic DFN package (2mm × 2mm × 0.75mm) with exposed pad soldered to PCB ground for thermal and electrical integrity. Pin 1 (IN), Pin 2 (GND), Pin 3 (OUT) are arranged in standard top-view orientation; exposed pad is electrically GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input Supply Terminal | Accepts 3.4V–20V input; internal reverse-battery protection blocks conduction below –15V |
| GND (Pin 2) | Ground Reference | Common return for input, output, and internal circuitry; exposed pad must be soldered to PCB GND plane |
| OUT (Pin 3) | Precision Output | Delivers regulated 2.5V; stable with 0µF output capacitance; sinks no current (series-only topology) |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables ultra-fast settling (<10µs), eliminates board area and ESR-related instability risks in portable designs |
| Reverse-battery protection | Blocks reverse current down to –15V input, preventing damage during incorrect battery insertion in handheld gear |
| Low IR reflow stress shift | 0.02% typical VOUT shift after solder reflow - reduces post-assembly calibration burden in high-volume manufacturing |
| 20mA guaranteed output current | Sources full load for precision op-amps, SAR ADC references, and multi-channel sensor bias networks without external boost |
| Space-saving DFN package | 2mm × 2mm footprint replaces larger SO-8 or TO-92 references - saves >70% board area vs. LT1460 alternatives |
Applications
| Handheld Instruments | Precision Regulators |
|---|---|
Use Scenario: Battery-powered multimeter with 16-bit ΣΔ ADC requiring stable reference over 0°C–50°C operating range and 5-year shelf life. IC Role / Device Role / Timing Role: Primary 2.5V reference for ADC and DAC, also biasing front-end op-amps and analog switches. Use Value: 0.2% initial accuracy + 20ppm/°C drift ensures <0.4% total error over temperature; 115µA supply current extends AA battery life beyond 2 years. |
Use Scenario: Low-noise LDO feedback divider reference in medical sensor power module, where output ripple must stay below 10µV RMS. IC Role / Device Role / Timing Role: High-PSRR, low-noise series reference setting LDO output voltage via precision resistor network. Use Value: 4ppm P-P (0.1Hz–10Hz) noise and 80dB PSRR at 100Hz suppress input ripple coupling into regulated output. |
| A/D and D/A Converters | Sensor Modules |
Use Scenario: Portable gas analyzer using 24-bit ADC with programmable gain amplifier, requiring reference stability better than 2ppm over 1-hour measurement window. IC Role / Device Role / Timing Role: Master reference for ADC, DAC, and PGA gain-setting resistors - all traceable to same 2.5V source. Use Value: 100ppm/√kHr long-term stability and <50ppm hysteresis ensure repeatable calibration across field deployments. |
Use Scenario: MEMS pressure sensor module with integrated signal conditioning, operating from coin-cell battery in cold-chain logistics tags. IC Role / Device Role / Timing Role: Bias reference for bridge excitation and instrumentation amplifier - directly impacts pressure measurement linearity. Use Value: 0.9V dropout enables operation down to 3.4V input, extending usable battery voltage range by 15% vs. higher-dropout alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision series reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1460CCS8-2.5 | 0.075% initial accuracy, 10ppm/°C TC, 20mA output, SO-8 package, requires 1µF output cap | Higher accuracy and lower drift, but larger footprint and mandatory output capacitor limit settling speed | Choose when ultimate drift performance outweighs board space and capacitor-free operation |
| LTC6655CMS-2.5 | 0.025% initial accuracy, 2ppm/°C TC, 10mA output, MSOP-8 package, 0.5µV P-P noise (0.1Hz–10Hz) | Superior noise and drift specs, but lower output current and higher cost; no reverse-battery protection | Choose for metrology-grade systems where 10mA load suffices and sub-ppm stability is mandatory |
Compared with LT6660HCDC-2.5, LT1460CCS8-2.5 offers tighter drift but sacrifices capacitor-free operation and compact size; LTC6655CMS-2.5 delivers ultra-low noise and drift yet lacks reverse protection and cannot drive 20mA loads - making LT6660HCDC-2.5 the optimal balance of micropower efficiency, robustness, and space-constrained performance.
Availability
LT6660HCDC-2.5 is available at Aetrix Electronics and suitable for handheld instruments, precision regulators, A/D and D/A converters, and sensor modules requiring stable component supply, long-term calibration retention, and low-power operation across commercial temperature ranges.
Supply support for LT6660HCDC-2.5 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT6660 family was designed specifically for micropower, high-accuracy series reference applications in space- and energy-constrained systems - emphasizing low dropout, no-output-capacitor stability, and robust thermal behavior in miniature DFN packages.
FAQ
What is the minimum input voltage required for stable operation of the LT6660HCDC-2.5?
The LT6660HCDC-2.5 requires a minimum input voltage of VOUT + 0.9V = 3.4V for stable regulation at zero load. At 10mA output, the dropout increases to 1.3V, requiring ≥3.8V input. Operation below these thresholds results in unregulated output and degraded line/load regulation performance per the datasheet's dropout voltage specifications.
Does the LT6660HCDC-2.5 require an output capacitor for stability?
No, the LT6660HCDC-2.5 is explicitly designed to be stable with 0µF output capacitance - a key differentiator from most series references. This eliminates board area, cost, and ESR-related instability risks. Adding capacitance (e.g., 0.1µF) slows settling but may reduce high-frequency noise; maximum recommended values depend on load current and are detailed in Table 1 of the datasheet.
How does reverse-battery protection function in the LT6660HCDC-2.5?
The LT6660HCDC-2.5 incorporates internal reverse-polarity protection that blocks conduction when VIN is below –15V, preventing destructive reverse current flow. This feature protects the device and downstream circuitry during incorrect battery installation in portable equipment - no external diode or protection circuit is needed, preserving efficiency and board space.
What is the long-term stability specification for the LT6660HCDC-2.5?
The LT6660HCDC-2.5 exhibits 100ppm/√kHr long-term stability of output voltage, measured over >1000 hours on PC-board-mounted units at 30°C ambient. This logarithmic drift behavior means the first 1000 hours dominate total shift; subsequent intervals show diminishing drift - critical for field-deployed instruments requiring recalibration intervals exceeding 2 years.
Can the LT6660HCDC-2.5 drive a 20mA load across its full temperature range?
Yes, the LT6660HCDC-2.5 guarantees 20mA sourcing capability over its specified 0°C to 70°C operating temperature range. Electrical characteristics tables confirm output current remains ≥40mA short-circuit (with derating above 85°C junction temperature), and load regulation is characterized up to 20mA at both 25°C and across temperature extremes.
LT6660HCDC-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 3-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 4ppmp-p
- Noise - 10Hz to 10kHz:
- 4ppmrms
- Voltage - Input:
- 3.4V ~ 20V
- Current - Supply:
- 175µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 3-DFN (2x2)
LT6660HCDC-2.5 FAQ
1.How can I place an order for LT6660HCDC-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6660HCDC-2.5 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 LT6660HCDC-2.5 reliable?
The price and inventory of LT6660HCDC-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6660HCDC-2.5 is usually 5 days.
3.What payment methods are accepted for LT6660HCDC-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6660HCDC-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6660HCDC-2.5?
LT6660HCDC-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6660HCDC-2.5 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 LT6660HCDC-2.5?
For technical support, including LT6660HCDC-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6660HCDC-2.5 requirements.
6.How does Aetrix verify that LT6660HCDC-2.5 is sourced from the original manufacturer or authorized distributors?
All LT6660HCDC-2.5 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 LT6660HCDC-2.5 meets industry standards.
7.What is the process for return or replacement of LT6660HCDC-2.5?
All LT6660HCDC-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LT6660HCDC-2.5, 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 LT6660HCDC-2.5 part is unused and in its original packaging.
Return procedure for LT6660HCDC-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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