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Analog Devices Inc. LT6650CS5#TRMPBF
- Part No.:
- LT6650CS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT6650CS5#TRMPBF.pdf
- Description:
- IC VREF SERIES 0.75% TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,513
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Product details
Overview
LT6650CS5#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, low-voltage 400mV series voltage reference with integrated rail-to-rail buffer amplifier in a 5-lead SOT-23 package. It operates from 1.4V to 18V supply, draws only 5.6µA typical quiescent current, delivers ±200µA output drive, and maintains ±0.75% max accuracy over 0°C to 70°C - ideal for battery-powered instrumentation and industrial sensor signal chains.
For engineers reviewing the LT6650CS5#TRMPBF datasheet, LT6650CS5#TRMPBF pinout, LT6650CS5#TRMPBF application, or LT6650CS5#TRMPBF equivalent, key selection criteria include its 400mV nominal output, post-package trimming for accuracy, ability to source/sink load current, compatibility with ≥1µF output capacitance, and configurable external resistor scaling up to near-supply voltage.
Technical Context
The LT6650CS5#TRMPBF integrates a precision bandgap reference core with a unity-gain rail-to-rail output buffer, enabling both series and shunt reference configurations. Its feedback (FB) pin allows precise external resistor-based gain adjustment while maintaining 1.2nA typical input bias current.
It employs bipolar process technology with internal ESD protection diodes on IN, OUT, and FB pins relative to GND, supports indefinite short-circuit operation, and achieves 30ppm/°C max temperature coefficient across its specified 0°C to 70°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 400mV ±0.75% over 0°C to 70°C - enables stable low-voltage ADC/DAC biasing and sensor excitation |
| Supply Current | 5.6µA typical at 5V - extends battery life in portable systems beyond 10 years at µA-level loads |
| Load Drive | ±200µA sourcing/sinking - supports direct interface to op-amp inputs, SAR ADC references, and analog switches |
| Line Regulation | 1–6mV over 1.4V–18V input - ensures stable output despite battery discharge or unregulated supply ripple |
| Temp Coefficient | 30ppm/°C max - contributes ≤210ppm error across full 0°C–70°C range, critical for precision measurement |
| Output Noise | 20µVP-P (0.1Hz–10Hz), 23µVRMS (10Hz–1kHz) - minimizes noise contribution in high-resolution data acquisition |
| Stability Cap | ≥1µF output capacitor required - guarantees phase margin and transient immunity without external compensation |
Pinout & Package
LT6650CS5#TRMPBF is housed in a 5-lead TSOT-23 (ThinSOT™) package, 1mm profile, JEDEC MO-193 compliant, with pin 1 marked by dimple. Pin 3 (DNC) is internally trimmed and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Resistor-divider node setting output voltage; 1.2nA bias current enables high-impedance scaling networks |
| 2 (GND) | Ground Reference | Common return for reference core, buffer, and ESD protection diodes; requires low-impedance connection |
| 3 (DNC) | No Connect | Internally used for post-package trimming; floating connection prevents calibration drift or instability |
| 4 (IN) | Positive Supply | Accepts 1.4V–18V; includes ESD diode to GND; bypass with ≥0.1µF recommended |
| 5 (OUT) | Buffered Reference Output | Sources/sinks ±200µA; stable with ≥1µF capacitive load; rail-to-rail swing enables wide output range |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 5.6µA supply current enables >10-year battery life in coin-cell–powered IoT sensors |
| Externally Adjustable Output | Two-resistor feedback scales output from 400mV to within 350mV of supply - eliminates need for multiple fixed references |
| Rail-to-Rail Buffer | Output swings to within mV of supply rails - supports low-voltage ADCs (e.g., 1.8V AVDD) without headroom loss |
| Shunt-Configurable Mode | Operates as 2-terminal adjustable "Zener" with external bias resistor - simplifies negative reference generation |
| Post-Trimmed Accuracy | ±0.75% max initial error over 0°C–70°C - reduces system calibration burden in production test |
Applications
| Battery-Powered Instrumentation | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Handheld multimeter or portable gas detector powered by two AA cells (2.4V–3.2V). IC Role / Device Role / Timing Role: Provides stable 400mV reference for 16-bit sigma-delta ADC and low-noise front-end op-amp. Use Value: 5.6µA quiescent current extends battery life to >5 years; 1µF stability cap eliminates external compensation components. | Use Scenario: 4–20mA loop-powered pressure transmitter in factory automation. IC Role / Device Role / Timing Role: Serves as precision excitation source for bridge sensor and reference for DAC-driven current output stage. Use Value: ±200µA drive capability directly biases Wheatstone bridge; ±0.75% accuracy over 0°C–70°C meets Class A industrial spec. |
| Negative Voltage References | Data Acquisition Systems |
Use Scenario: Isolated analog input module requiring –2.5V reference for bipolar signal conditioning. IC Role / Device Role / Timing Role: Configured as adjustable shunt reference with external bias resistor and inverting op-amp stage. Use Value: Shunt-mode operation enables true negative reference generation without dual supplies; 30ppm/°C TC ensures thermal stability in control cabinets. | Use Scenario: Modular DAQ card for lab equipment with 24-bit ADC and programmable gain instrumentation amplifier. IC Role / Device Role / Timing Role: Supplies ultra-low-noise 400mV reference to PGA and ADC reference input, scaled via resistors to 2.5V or 5V. Use Value: 20µVP-P (0.1Hz–10Hz) noise avoids degrading ENOB; 1µF output cap ensures fast settling after gain switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1460ACS8-4.096#TRPBF | 4.096V fixed output, 0.05% initial accuracy, 10ppm/°C TC, 35µA supply current | Higher voltage, tighter TC, but 6× higher quiescent current limits battery life | Select when absolute 4.096V is required and power budget allows >30µA |
| REF3040AIDBZR | 4.096V fixed output, ±0.2% initial accuracy, 50ppm/°C TC, 45µA supply current, 3-pin SOT-23 | Lower accuracy and higher TC than LT6650CS5#TRMPBF; no FB pin or adjustability | Select for cost-sensitive, non-adjustable 4.096V applications where 45µA supply is acceptable |
Compared with LT1460ACS8-4.096#TRPBF and REF3040AIDBZR, the LT6650CS5#TRMPBF uniquely combines sub-6µA quiescent current, 400mV low-voltage output, external adjustability, and ±200µA drive - making it irreplaceable in ultra-low-power, scalable reference designs where supply headroom is constrained.
Availability
LT6650CS5#TRMPBF is available at Aetrix Electronics and suitable for battery-operated instrumentation, industrial sensor signal conditioning, and data acquisition systems requiring stable component supply with guaranteed long-term availability and traceable lot history.
Supply support for LT6650CS5#TRMPBF 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 full product support, manufacturing, and documentation for legacy Linear parts including the LT6650 family.
The LT6650 product line was designed specifically for ultra-low-power, low-voltage precision reference applications in portable and energy-constrained systems - emphasizing micropower operation, wide supply range, and flexible configuration.
FAQ
What is the maximum operating temperature range for the LT6650CS5#TRMPBF?
The LT6650CS5#TRMPBF is specified for operation from 0°C to 70°C. This commercial-grade temperature range is clearly defined in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet. The 'CS5' suffix explicitly denotes this grade - distinct from the 'IS5' (–40°C to 85°C) and 'HS5' (–40°C to 125°C) variants. Exceeding 70°C may cause parametric shift beyond guaranteed limits.
Can the LT6650CS5#TRMPBF be used as a shunt reference, and how is it configured?
Yes, the LT6650CS5#TRMPBF can operate as an adjustable 2-terminal shunt reference. To configure it, connect the IN pin to the unregulated supply (VS), tie FB to GND, and connect OUT to the reference output node through an external bias resistor (RB). The device then regulates the voltage across RB, enabling both positive and negative reference topologies - as shown in Figures 9 and 10 of the LT6650 datasheet. This mode leverages its ability to sink and source current without requiring a dedicated ground-referenced supply.
What output capacitor value is required for stable operation of the LT6650CS5#TRMPBF?
The LT6650CS5#TRMPBF requires a minimum 1µF output capacitor connected between OUT and GND for guaranteed stability across all operating conditions. This is explicitly stated in the datasheet's "Stability is ensured with any output capacitor of 1µF or higher" note and reinforced in the Applications Information section. Using less than 1µF risks oscillation or poor transient response; larger values (e.g., 10µF) improve load-step immunity but are not mandatory for basic stability.
Does the LT6650CS5#TRMPBF have built-in ESD protection, and what are the limits?
Yes, the LT6650CS5#TRMPBF includes integrated ESD protection diodes from IN, OUT, and FB pins to GND. Per Absolute Maximum Ratings, the FB pin is protected to –0.3V below GND, and forward current into these diodes must be limited to <10mA to prevent damage. The device is rated as ESD-sensitive (Class 1C per JEDEC JS-001), so standard ESD handling precautions - including grounded workstations and ionized air - are required during assembly and testing of the LT6650CS5#TRMPBF.
How is the output voltage adjusted on the LT6650CS5#TRMPBF, and what resistor tolerance is recommended?
The LT6650CS5#TRMPBF output voltage is adjusted using two external resistors: RF from OUT to FB, and RG from FB to GND. The relationship is VOUT = 0.4V × (1 + RF/RG). Because the VOUT error distribution increases at twice the resistor tolerance, the datasheet recommends high-accuracy resistors or matched networks - especially for applications demanding <0.1% total error. For example, 0.1% tolerance resistors yield ≤0.2% resistor-induced error in the final reference voltage of the LT6650CS5#TRMPBF.
LT6650CS5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 0.4V
- Voltage - Output (Max):
- -
- Current - Output:
- 200 µA
- Tolerance:
- ±0.75%
- Temperature Coefficient:
- 30ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- 20µVp-p
- Noise - 10Hz to 10kHz:
- 23µVrms
- Voltage - Input:
- 1.4V ~ 18V
- Current - Supply:
- 15µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT6650CS5#TRMPBF FAQ
1.How can I place an order for LT6650CS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6650CS5#TRMPBF 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 LT6650CS5#TRMPBF reliable?
The price and inventory of LT6650CS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6650CS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT6650CS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6650CS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6650CS5#TRMPBF?
LT6650CS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6650CS5#TRMPBF 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 LT6650CS5#TRMPBF?
For technical support, including LT6650CS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6650CS5#TRMPBF requirements.
6.How does Aetrix verify that LT6650CS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT6650CS5#TRMPBF 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 LT6650CS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT6650CS5#TRMPBF?
All LT6650CS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6650CS5#TRMPBF, 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 LT6650CS5#TRMPBF part is unused and in its original packaging.
Return procedure for LT6650CS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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