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Texas Instruments LT1009IDR
- Part No.:
- LT1009IDR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1009IDR.pdf
- Description:
- IC VREF SHUNT 0.4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,722
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Product details
Overview
LT1009IDR from Texas Instruments is a precision 2.5-V shunt voltage reference IC in SOIC-8 package, featuring ±10 mV initial tolerance (±0.4%), 20 ppm/°C max average temperature coefficient over –40°C to 85°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 industrial sensor signal conditioning.
For engineers reviewing the LT1009IDR datasheet, LT1009IDR pinout, LT1009IDR application, or LT1009IDR equivalent, key selection criteria include its wide operating current range (400 µA to 10 mA), no-trim design for minimum tempco, compatibility with LM136-2.5 footprints, and guaranteed performance across extended industrial temperature range.
Technical Context
The LT1009IDR operates as a three-terminal shunt reference with ANODE, CATHODE, and ADJ terminals. Its internal trimming achieves low initial error and minimizes αVZ without external adjustment. The ADJ pin enables ±5% reference voltage tuning by injecting current into the internal bandgap node.
It delivers stable 2.5 V output under reverse-biased operation with cathode as output node, supports 0.4–1 V forward voltage at 2 mA, and maintains ≤1.4 Ω full-range dynamic impedance. Thermal performance is characterized by θJA = 97°C/W in SOIC-D package, enabling reliable operation up to 150°C junction temperature.
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 tight system-level accuracy for 8-bit converters |
| Initial Tolerance | ±10 mV (±0.4%) at 25°C; eliminates need for post-assembly calibration in cost-sensitive designs |
| Tempco (αVZ) | 20–35 ppm/°C over –40°C to 85°C; guarantees <±15 mV drift across full industrial range |
| Dynamic Impedance | 0.6 Ω max at 1 mA; provides low noise and high PSRR in noisy supply environments |
| Adjustment Range | ±5% via ADJ pin; allows fine-tuning to compensate for PCB trace resistance or DAC offset errors |
| Operating Current | 400 µA to 10 mA; supports ultra-low-power sensor nodes and high-current reference buffers |
| Long-Term Drift | 20 ppm/khr at 25°C; ensures stability over years in unattended instrumentation systems |
Pinout & Package
LT1009IDR uses an 8-pin SOIC (D) package with 3 active terminals (ANODE, CATHODE, ADJ) and 5 no-connect (NC) pins. Pin 1 is ANODE; pins 4 and 7 are CATHODE; pin 8 is ADJ. The remaining pins (2, 3, 5, 6) have no internal connection and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Anode of internal shunt regulator | Connects to system ground or low-impedance return path; defines reference current sink point |
| Pins 4 & 7 (CATHODE) | Cathode output node | Provides 2.5-V reference voltage; dual-cathode layout improves thermal symmetry and current sharing |
| Pin 8 (ADJ) | Adjustment terminal | Accepts external current to shift reference voltage ±5%; open-circuit configures nominal 2.5 V output |
| Pins 2, 3, 5, 6 (NC) | No internal connection | Must be left floating; no routing or grounding permitted to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Enables ±0.4% initial tolerance and <35 ppm/°C tempco without external components |
| Three-terminal architecture | Allows ±5% output adjustment while preserving low tempco-unlike two-terminal references |
| Terminal-for-terminal LM136-2.5 replacement | Eliminates redesign effort when upgrading from legacy references in existing SOIC layouts |
| Wide dynamic current range | Operates reliably from 400 µA (battery-powered sensors) to 10 mA (driving op-amp buffers) |
| Low dynamic impedance | 0.6 Ω max ensures minimal load-induced voltage shift in multi-channel data acquisition systems |
Applications
| Industrial Power-Supply Monitor | 8-Bit ADC Reference |
|---|---|
Use Scenario: Monitoring 5-V rail in PLC I/O modules with ±2% fault detection threshold. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5-V comparison voltage for comparator input. Use Value: ±0.4% initial tolerance and 20 ppm/°C tempco ensure consistent trip points across –40°C to 85°C ambient. |
Use Scenario: Reference for 8-bit SAR ADC sampling thermistor-based temperature sensors. IC Role / Device Role / Timing Role: Precision voltage source defining LSB step size (9.8 mV) in ADC transfer function. Use Value: 0.6 Ω dynamic impedance prevents code flicker during fast analog input slewing. |
| Digital Voltmeter Front-End | Current-Loop Transmitter |
Use Scenario: Input scaling circuit in handheld DVM measuring 0–20 V range with 10-mV resolution. IC Role / Device Role / Timing Role: Buffered 2.5-V reference feeding integrator op-amp in dual-slope conversion. Use Value: Long-term drift of 20 ppm/khr maintains calibration validity for >12 months between adjustments. |
Use Scenario: Setting precise 4–20 mA loop current in HART-enabled field transmitters. IC Role / Device Role / Timing Role: Reference for voltage-to-current converter controlling MOSFET gate drive. Use Value: Adjustable ±5% output compensates for PCB copper resistance and op-amp input offset errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt 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), higher 100 ppm/°C tempco, no ADJ pin | Lacks voltage adjustability; requires external trim network for system-level calibration | Choose LM136-2.5 only if cost is primary constraint and ±1% tolerance is acceptable |
| TL431ACDR | 2.495 V nominal, ±1% tolerance, 50 ppm/°C tempco, programmable via resistor divider (no ADJ pin) | Requires two external resistors for 2.5-V setting; higher dynamic impedance (0.2 Ω typical but not specified max) | Prefer TL431ACDR for cost-sensitive consumer applications where 1% tolerance suffices |
Compared with LM136-2.5 and TL431ACDR, the LT1009IDR delivers superior initial accuracy and temperature stability without external components, making it optimal for industrial-grade measurement systems requiring long-term repeatability and minimal calibration overhead.
Availability
LT1009IDR is available at Aetrix Electronics and suitable for industrial power-supply monitoring, 8-bit data acquisition, and current-loop transmitter designs requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT1009IDR 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 decades of expertise in precision voltage references and industrial-grade ICs.
The LT1009IDR belongs to TI's precision shunt reference product line, engineered specifically for high-stability applications in industrial automation, test equipment, and sensor signal chains where low tempco and tight initial tolerance are critical.
FAQ
What is the operating temperature range for the LT1009IDR?
The LT1009IDR is rated for operation from –40°C to +85°C, meeting extended industrial temperature requirements. This range is confirmed in the Electrical Characteristics table for the "LT1009I" grade, and the "IDR" suffix denotes the SOIC-D package with tape-and-reel packaging. Performance parameters including reference voltage, tempco, and dynamic impedance are fully specified across this full range.
Can the LT1009IDR replace the LM136-2.5 without board changes?
Yes, the LT1009IDR is explicitly designed as a terminal-for-terminal replacement for the LM136-2.5 in SOIC-8 packages. Both share identical pinout (ANODE at pin 1, CATHODE at pins 4/7, NC elsewhere), same footprint, and compatible biasing. The LT1009IDR adds an ADJ pin (pin 8) that can be left open to retain nominal 2.5-V operation-no PCB modifications are required.
What is the maximum recommended reference current for the LT1009IDR?
The absolute maximum reverse current for the LT1009IDR is 20 mA, per Absolute Maximum Ratings. However, the Recommended Operating Conditions specify a practical upper limit of 10 mA for stable operation across temperature. At 10 mA, the device remains within its 150°C junction temperature limit given θJA = 97°C/W and typical ambient conditions, ensuring long-term reliability.
How does the ADJ pin on the LT1009IDR function?
The ADJ pin on the LT1009IDR allows ±5% adjustment of the reference voltage by injecting or sinking current. When ADJ is open, the output is precisely 2.5 V. Applying a voltage between 0.6 V and (VZ – 0.6 V) to ADJ shifts VZ linearly; for example, 0 V at ADJ lowers output to ~2.375 V, while VZ at ADJ raises it to ~2.625 V. This enables system-level trimming without altering the core reference topology.
Is the LT1009IDR RoHS compliant and lead-free?
Yes, the LT1009IDR is RoHS compliant and features a lead finish of NiPdAu (NIPDAU), as documented in the Package Option Addendum. It meets JEDEC Level-1 moisture sensitivity rating with peak reflow temperature of 260°C, and all variants-including LT1009IDR-are marked "Yes" under RoHS in TI's official packaging documentation.
LT1009IDR 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:
- 35ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 400 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LT1009IDR FAQ
1.How can I place an order for LT1009IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009IDR 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 LT1009IDR reliable?
The price and inventory of LT1009IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009IDR is usually 5 days.
3.What payment methods are accepted for LT1009IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009IDR?
LT1009IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009IDR 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 LT1009IDR?
For technical support, including LT1009IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009IDR requirements.
6.How does Aetrix verify that LT1009IDR is sourced from the original manufacturer or authorized distributors?
All LT1009IDR 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 LT1009IDR meets industry standards.
7.What is the process for return or replacement of LT1009IDR?
All LT1009IDR units undergo pre-shipment inspection (PSI). If there is an issue with LT1009IDR, 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 LT1009IDR part is unused and in its original packaging.
Return procedure for LT1009IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009IDR Tags
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