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Texas Instruments LT1009CDR
- Part No.:
- LT1009CDR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1009CDR.pdf
- Description:
- IC VREF SHUNT 0.4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,046
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Product details
Overview
LT1009CDR from Texas Instruments is a precision 2.5-V shunt voltage reference IC in SOIC-8 package, featuring ±10 mV initial tolerance (±0.4%), 15 ppm/°C max average temperature coefficient over 0°C to 70°C, 0.6 Ω max dynamic impedance at 1 mA, and adjustable output via ADJ pin (±5% range). It serves as a stable reference in 8-bit ADC/DAC circuits, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009CDR datasheet, LT1009CDR pinout, LT1009CDR application, or LT1009CDR equivalent, key selection considerations include its shunt topology, SOIC-8 thermal performance (θJA = 97°C/W), adjustment capability without external trim network, and direct interchangeability with LM136-2.5 in many designs.
Technical Context
The LT1009CDR operates as a two-terminal shunt reference with three-terminal adjustment capability: anode connects to system ground, cathode sinks current to set reference voltage, and ADJ enables ±5% fine-tuning of VZ by injecting current. Its on-chip trimming achieves low initial error and minimizes αVZ, eliminating need for external compensation.
It delivers stable 2.5 V output across 400 µA–10 mA cathode current, maintains <1.4 Ω dynamic impedance up to full operating temperature range, and exhibits 20 ppm/khr long-term stability at 25°C - all while requiring no external components for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.49 V to 2.51 V at IZ = 1 mA (D/PW package); ensures ≤±0.4% accuracy in mid-range current conditions |
| Initial Tolerance | ±10 mV max (±0.4%) at 25°C; enables high-accuracy system calibration without post-manufacture trimming |
| Temp Coefficient | 15 ppm/°C max (0°C to 70°C); guarantees ≤±1.05 mV drift across industrial ambient range |
| Dynamic Impedance | 0.6 Ω max at 1 mA; provides low noise and high PSRR in sensitive analog measurement paths |
| Adjustment Range | ±5% via ADJ pin; allows system-level error correction without adding external resistors or potentiometers |
| Operating Current | 400 µA to 10 mA cathode current; supports low-power sensor interfaces and high-current reference buffering |
| Long-Term Drift | 20 ppm/khr at 25°C; ensures <±0.05% output shift over 10 years in typical use |
Pinout & Package
LT1009CDR uses an 8-pin SOIC (D) package with 1.75 mm maximum height, 330 mm reel diameter, and JEDEC MS-012 compliant footprint. Pin 1 is located in quadrant Q1 per tape orientation standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 6 | No internal connection (NC) | Electrically isolated; must remain unconnected or tied to ground only if required for mechanical stability |
| 4 | Anode | Connects to system ground; defines reference return path and establishes shunt topology |
| 5, 7 | Cathode | Current-sinking node; sets reference voltage at external node when combined with series resistor |
| 8 | ADJ | Enables ±5% output adjustment via injected current; open-circuit default yields nominal 2.5 V |
Key Features
| Feature | Design Value |
|---|---|
| On-chip trimming | Eliminates need for external calibration components and reduces board space vs. discrete Zener+op-amp solutions |
| Terminal-for-terminal LM136-2.5 replacement | Reduces redesign effort in legacy systems upgrading from LM136 while maintaining same PCB layout |
| No external components required | Operates as standalone 2.5-V reference with only one series resistor - simplifies BOM and improves reliability |
| Wide cathode current range | Supports both ultra-low-power (400 µA) sensing nodes and higher-drive (10 mA) buffer stages without derating |
| Low dynamic impedance | Minimizes AC error coupling in mixed-signal systems where reference shares supply with switching regulators |
Applications
| ADC Reference | DAC Reference |
|---|---|
|
Use Scenario: Providing reference voltage for 8-bit successive-approximation ADC in industrial data acquisition module. IC Role / Device Role / Timing Role: Shunt reference establishing precise 2.5-V full-scale input range for analog front-end. Use Value: ±10 mV initial tolerance ensures <±0.5 LSB error at 8-bit resolution without calibration. |
Use Scenario: Setting output scale for 8-bit DAC driving analog control signals in programmable logic controller. IC Role / Device Role / Timing Role: Stable voltage source defining DAC's output span and minimizing gain drift. Use Value: 15 ppm/°C tempco limits full-scale error to <±1.05 mV over 0°C–70°C ambient range. |
| Power-Supply Monitor | Digital Voltmeter |
|
Use Scenario: Monitoring regulated 5-V rail in embedded system using comparator with hysteresis. IC Role / Device Role / Timing Role: Precision threshold generator enabling accurate undervoltage lockout detection. Use Value: Low dynamic impedance prevents reference sag during transient load steps, ensuring reliable trip points. |
Use Scenario: Serving as primary reference in handheld digital multimeter measuring DC voltages up to 20 V. IC Role / Device Role / Timing Role: Core accuracy element defining measurement resolution and long-term repeatability. Use Value: 20 ppm/khr long-term stability ensures <±0.05% reading deviation over 10-year product lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM136-2.5 | Same 2.5-V nominal output but ±1% initial tolerance (25 mV), no ADJ pin, higher 10 Ω dynamic impedance | Lacks adjustment capability; requires external trim network for system-level calibration | Select LM136-2.5 only when cost sensitivity outweighs accuracy and adjustability requirements |
| TL431ACDR | Programmable 2.495 V reference with 2% initial tolerance, 0.2 Ω typical impedance, but requires external resistive divider for 2.5 V | Needs two external resistors to set 2.5 V; introduces additional error sources and layout sensitivity | Choose TL431ACDR when flexibility to reconfigure reference voltage is prioritized over guaranteed 2.5 V accuracy |
Compared with LM136-2.5, LT1009CDR offers 25× tighter initial tolerance and integrated adjustment; compared with TL431ACDR, it delivers factory-trimmed 2.5 V without external components - making it optimal for fixed-accuracy, low-component-count applications.
Availability
LT1009CDR is available at Aetrix Electronics and suitable for precision ADC/DAC references, power-supply monitoring circuits, and digital voltmeter designs requiring stable component supply with guaranteed long-term performance.
Supply support for LT1009CDR 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of innovation in precision analog ICs.
The LT1009CDR belongs to TI's precision voltage reference product line, engineered specifically for applications demanding high initial accuracy, low temperature drift, and minimal external component count in industrial and test equipment.
FAQ
What is the operating temperature range for the LT1009CDR?
The LT1009CDR is characterized for operation from 0°C to 70°C. This commercial-grade specification aligns with its "C" suffix designation and ensures guaranteed performance - including ±10 mV initial tolerance and 15 ppm/°C max temperature coefficient - across that full ambient range. Operation outside this range may result in parametric degradation not covered by datasheet limits.
Can the LT1009CDR replace the LM136-2.5 without PCB changes?
Yes, the LT1009CDR is explicitly designed as a terminal-for-terminal replacement for the LM136-2.5 in SOIC-8 packages. Both share identical pinout (anode, cathode, NCs), same package dimensions, and compatible biasing requirements - allowing drop-in substitution without layout modification. However, the LT1009CDR adds an ADJ pin (pin 8) that must remain open or grounded per application needs.
How does the ADJ pin on the LT1009CDR function?
The ADJ pin (pin 8) on the LT1009CDR enables ±5% adjustment of the reference voltage by injecting or sinking current. With ADJ open, LT1009CDR delivers nominal 2.5 V. Applying current into ADJ raises VZ; sinking current lowers it - all while preserving low dynamic impedance and temperature stability. No external resistors are needed for basic adjustment.
What is the maximum cathode current rating for the LT1009CDR?
The LT1009CDR supports a cathode current range of 400 µA to 10 mA under recommended operating conditions. At 10 mA, power dissipation reaches ~25 mW in typical configurations. Thermal design must account for θJA = 97°C/W; junction temperature must remain below 150°C, especially at elevated ambient temperatures.
Does the LT1009CDR require external capacitors for stability?
No, the LT1009CDR is internally compensated and does not require external capacitors for stability in standard shunt configurations. Its low dynamic impedance (0.6 Ω max) and wide bandwidth allow direct use with resistive dividers or op-amp buffers. Capacitors may be added for noise filtering in high-EMI environments, but they are not mandatory for loop stability.
LT1009CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.4%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 400 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LT1009CDR FAQ
1.How can I place an order for LT1009CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009CDR 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 LT1009CDR reliable?
The price and inventory of LT1009CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009CDR is usually 5 days.
3.What payment methods are accepted for LT1009CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009CDR?
LT1009CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009CDR 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 LT1009CDR?
For technical support, including LT1009CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009CDR requirements.
6.How does Aetrix verify that LT1009CDR is sourced from the original manufacturer or authorized distributors?
All LT1009CDR 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 LT1009CDR meets industry standards.
7.What is the process for return or replacement of LT1009CDR?
All LT1009CDR units undergo pre-shipment inspection (PSI). If there is an issue with LT1009CDR, 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 LT1009CDR part is unused and in its original packaging.
Return procedure for LT1009CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009CDR Tags
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