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Texas Instruments LT1009IDRG4
- Part No.:
- LT1009IDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1009IDRG4.pdf
- Description:
- IC VREF SHUNT 0.4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,072
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Product details
Overview
LT1009IDRG4 from Texas Instruments is a precision 2.5-V shunt voltage reference IC with ±10 mV initial tolerance (±0.4%), 20 ppm/°C max average temperature coefficient, and 0.6 Ω max dynamic impedance, designed for high-stability analog references in ADC/DAC circuits, power-supply monitors, and digital voltmeters.
For engineers reviewing the LT1009IDRG4 datasheet, LT1009IDRG4 pinout, LT1009IDRG4 application, or LT1009IDRG4 equivalent, this page delivers verified electrical specs, SOIC-8 package mapping, terminal-level design meaning, and two confirmed alternative parts for industrial-grade 2.5-V reference replacement scenarios.
Technical Context
The LT1009IDRG4 operates as a three-terminal shunt reference with ANODE, CATHODE, and ADJ pins, enabling ±5% output adjustment via external resistor networks while maintaining low temperature drift. Its on-chip trimming eliminates need for external calibration.
It functions across –40°C to +85°C, supports 400 µA–10 mA operating current, delivers 2.475 V–2.525 V reference voltage over full temperature range, and exhibits 1.4 Ω max full-range dynamic impedance - critical for noise-sensitive measurement systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V nominal at 1 mA; ±10 mV (±0.4%) initial tolerance in D package ensures tight system-level accuracy without trimming. |
| Temperature Coefficient | 20–35 ppm/°C max (–40°C to +85°C); enables stable reference performance in automotive and industrial environments. |
| Dynamic Impedance | 0.6 Ω max at 1 mA; minimizes output voltage variation under load transients in precision DAC/ADC biasing. |
| Adjustment Range | ±5% via ADJ pin; allows fine-tuning to compensate for PCB trace resistance or system gain errors without redesign. |
| Operating Current | 400 µA–10 mA; supports low-power sensor interfaces and high-current reference buffering in mixed-signal systems. |
| Long-Term Drift | 20 ppm/khr at 25°C; ensures multi-year stability in battery-powered instrumentation and calibration equipment. |
Pinout & Package
LT1009IDRG4 uses an 8-pin SOIC (D) package with 1.75 mm max height, RoHS-compliant NiPdAu lead finish, and Level-1 moisture sensitivity rating. Pin 1 is located at top-left corner with notch marking; pins 1–4 on left side, 5–8 on right side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 6 | NC | No internal connection; electrically isolated - must remain unconnected or tied to ground only if required by layout EMI mitigation. |
| 4 | ANODE | Reference input node; connects to system ground or negative rail when used in standard shunt configuration. |
| 5, 7 | CATHODE | Main reference output node; supplies 2.5 V to load; requires series resistor from positive supply to limit current. |
| 8 | ADJ | Voltage-adjustment terminal; accepts external resistor divider to shift output ±5% - enables system-level error correction. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip trimming | Eliminates external trim network needed for LM136-2.5, reducing BOM count and board space in 5-V system references. |
| Wide current range | Operates reliably from 400 µA to 10 mA - supports both ultra-low-power IoT sensors and high-drive buffer stages. |
| Low dynamic impedance | 0.6 Ω max at 1 mA ensures minimal voltage droop during fast load steps in 12-bit+ data acquisition systems. |
| Terminal-for-terminal LM136 compatibility | Direct drop-in replacement in existing designs using LM136-2.5, avoiding PCB rework or schematic changes. |
| Stable over industrial temp range | Specified from –40°C to +85°C with ≤15 mV total ΔVZ variation - suitable for outdoor metering and factory automation. |
Applications
| Industrial Power-Supply Monitor | 8-Bit ADC Reference |
|---|---|
|
Use Scenario: Monitoring 24-V DC bus voltage in PLC I/O modules with ±1% accuracy requirement. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5-V基准 for comparator threshold generation and ADC scaling. Use Value: 20 ppm/°C tempco and 0.6 Ω impedance ensure <±3 LSB error over –40°C to +85°C ambient. |
Use Scenario: Supplying reference voltage to 8-bit successive-approximation ADC in portable medical sensor. IC Role / Device Role / Timing Role: Precision voltage source for ADC full-scale calibration, directly interfaced to VREF pin. Use Value: ±10 mV initial tolerance guarantees <±0.4% full-scale error before system calibration. |
| Digital Voltmeter Front-End | Current-Loop Transmitter |
|
Use Scenario: High-impedance input stage of handheld DVM measuring 0–20 V range with auto-ranging. IC Role / Device Role / Timing Role: Stable 2.5-V reference for dual-slope integrator and scaling resistors. Use Value: 20 ppm/°C tempco and 20 ppm/khr long-term drift enable ±0.05% reading stability over 2-year calibration cycle. |
Use Scenario: Setting precise 4–20 mA loop current in HART-enabled field transmitter. IC Role / Device Role / Timing Role: Reference for op-amp-based current source controlling MOSFET gate drive. Use Value: ADJ pin allows ±5% tuning to match DAC output and eliminate 0.1% gain mismatch in 4–20 mA span. |
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 (10× looser), no ADJ pin, higher 20 Ω dynamic impedance. | Lacks adjustment capability and thermal stability; requires external trim network for precision use. | Select LM136-2.5 only for cost-sensitive, non-critical applications where ±1% reference accuracy suffices. |
| TL431ACDR | Programmable 2.495 V reference with 2% initial tolerance, 0.2 Ω typical impedance, but no guaranteed 20 ppm/°C tempco. | Wider adjustment range (2.5–36 V) but less stable over temperature; not qualified for –40°C to +85°C without derating. | Choose TL431ACDR for variable-output or higher-voltage shunt needs, but verify tempco compliance per unit test. |
Compared with LM136-2.5 and TL431ACDR, LT1009IDRG4 uniquely delivers factory-trimmed 0.4% initial accuracy, guaranteed 20 ppm/°C tempco over full industrial range, and ±5% ADJ capability - making it optimal for calibrated instrumentation and long-life embedded systems.
Availability
LT1009IDRG4 is available at Aetrix Electronics and suitable for industrial power-supply monitors, 8-bit ADC references, and digital voltmeter front-ends requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LT1009IDRG4 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 power management ICs.
The LT1009 product line was engineered specifically for high-stability, low-drift shunt references in industrial, test-and-measurement, and process control systems - prioritizing long-term accuracy and wide-temperature reliability over cost or feature count.
FAQ
What is the maximum operating current for LT1009IDRG4?
The LT1009IDRG4 supports a recommended operating current range of 400 µA to 10 mA. At 10 mA, it maintains ≤1.4 Ω dynamic impedance and ≤15 mV total voltage variation across –40°C to +85°C. Exceeding 10 mA risks exceeding absolute maximum junction temperature limits.
Does LT1009IDRG4 require external capacitors for stability?
No, LT1009IDRG4 is inherently stable and does not require external output capacitors. Its internal design ensures stability with purely resistive loads. Adding capacitance may introduce phase shift and transient overshoot - TI's datasheet explicitly states "no capacitor required" for standard operation.
Can LT1009IDRG4 replace LM136-2.5 without circuit modification?
Yes, LT1009IDRG4 is specified as a terminal-for-terminal replacement for LM136-2.5 in SOIC-8 packages. Pinout, footprint, and basic connection topology match exactly. However, the ADJ pin (pin 8) must be left open or grounded depending on whether adjustment is needed - unlike LM136-2.5 which has no ADJ function.
What is the purpose of the NC pins on LT1009IDRG4?
Pins 1, 2, 3, and 6 on LT1009IDRG4 are No-Connection (NC) terminals with no internal bond wires or silicon connections. They must remain unconnected in PCB layout. Routing traces to these pins or tying them to ground/voltage violates TI's recommended practice and may induce parasitic coupling or thermal imbalance.
How does the ADJ pin affect LT1009IDRG4's temperature coefficient?
The ADJ pin allows ±5% output adjustment but does not degrade the temperature coefficient. TI's datasheet confirms that trimming via ADJ "does not affect temperature coefficient" - the 20–35 ppm/°C spec remains fully valid across the entire adjustment range, preserving accuracy in thermally varying environments.
LT1009IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LT1009IDRG4 FAQ
1.How can I place an order for LT1009IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009IDRG4 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 LT1009IDRG4 reliable?
The price and inventory of LT1009IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009IDRG4 is usually 5 days.
3.What payment methods are accepted for LT1009IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009IDRG4?
LT1009IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009IDRG4 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 LT1009IDRG4?
For technical support, including LT1009IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009IDRG4 requirements.
6.How does Aetrix verify that LT1009IDRG4 is sourced from the original manufacturer or authorized distributors?
All LT1009IDRG4 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 LT1009IDRG4 meets industry standards.
7.What is the process for return or replacement of LT1009IDRG4?
All LT1009IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LT1009IDRG4, 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 LT1009IDRG4 part is unused and in its original packaging.
Return procedure for LT1009IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1009IDRG4 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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