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Analog Devices Inc. LT1009IS8#PBF
- Part No.:
- LT1009IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1009IS8#PBF.pdf
- Description:
- IC VREF SHUNT 0.4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,878
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Product details
Overview
LT1009IS8#PBF from Analog Devices (formerly Linear Technology) is a precision 2.5V shunt voltage reference in an 8-lead SO package, featuring ±5 mV initial tolerance (0.2%), 35 ppm/°C max temperature coefficient over –40°C to +85°C, 0.6 Ω max dynamic impedance, and adjustable output via third terminal for ±5% calibration. It serves as a stable reference in 5V systems, 8-bit data converters, and power supply monitors.
For engineers reviewing the LT1009IS8#PBF datasheet, LT1009IS8#PBF pinout, LT1009IS8#PBF application, or LT1009IS8#PBF equivalent, key selection criteria include guaranteed temperature stability across industrial temperature range, low dynamic impedance for high PSRR in noisy supplies, trim capability to compensate system-level offsets, and direct interchangeability with LM136 without external trim network.
Technical Context
The LT1009IS8#PBF implements a bandgap-derived shunt regulator topology with on-chip laser trimming to achieve 0.2% initial accuracy and minimize both initial error and temperature drift. Its three-terminal architecture (ADJ, +, –) enables ±5% output adjustment without affecting temperature coefficient.
It operates over 400 μA to 10 mA reverse current, supports wide input voltage range (3.6 V to 35 V), and delivers guaranteed stability across –40°C to +85°C with 35 ppm/°C max average TC - tighter than commercial-grade LT1009S8#PBF (25 ppm/°C) due to extended temperature qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±5 mV at 25°C - ensures precise ADC/DAC full-scale alignment without post-calibration. |
| Initial Tolerance | ±0.2% - achieved via on-chip laser trimming, reducing BOM count by eliminating external calibration resistors. |
| Temp Coefficient | Max 35 ppm/°C (–40°C to +85°C) - maintains <±0.875 mV drift over full industrial range, critical for metering accuracy. |
| Dynamic Impedance | Max 0.6 Ω at 1 mA - suppresses ripple and noise coupling from unregulated supplies into reference node. |
| Operating Current | 400 μA to 10 mA - enables use with high-impedance bias networks and low-power sensor interfaces. |
| Long-Term Stability | 20 ppm/kHr - ensures reference integrity over years of operation in embedded monitoring systems. |
Pinout & Package
LT1009IS8#PBF uses an 8-lead plastic SO (Small Outline) package, 0.150-inch body width, with thermal resistance θJA = 190°C/W. Pin 1 is ADJ, pins 2–4 and 6–7 are NC, pin 5 is (+), pin 8 is (–).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ADJ) | Adjust terminal | Enables ±5% output voltage calibration using external resistor divider; does not degrade temperature coefficient. |
| Pins 2–4, 6–7 (NC) | No-connect | Unbonded internal pads - must remain floating; no PCB routing or grounding required. |
| Pin 5 (+) | Anode / Output | Reference voltage output node; connects to load or feedback network of downstream regulators/converters. |
| Pin 8 (–) | Cathode / Return | Current sink path; ties to system ground or negative rail in bipolar configurations. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip laser trimming | Delivers 0.2% initial accuracy and minimizes both initial error and temperature drift simultaneously. |
| Third-terminal adjustability | ±5% output calibration without altering temperature coefficient - eliminates need for external trim potentiometers. |
| Guaranteed industrial temp range | Specified performance from –40°C to +85°C - suitable for outdoor instrumentation and factory automation. |
| Low dynamic impedance | 0.6 Ω max ensures minimal output voltage perturbation under varying load or supply ripple conditions. |
| LM136 pin-compatible replacement | Direct drop-in upgrade with improved accuracy, lower drift, and integrated trim - removes external trim network. |
Applications
| 5V System Reference | 8-Bit Data Converter Reference |
|---|---|
Use Scenario: Providing stable 2.5V reference for microcontroller-based 5V power rails in programmable logic controllers. IC Role / Device Role / Timing Role: Shunt voltage reference establishing accurate VREF for internal ADCs and analog comparators. Use Value: Enables consistent 5V system margining and fault detection within ±0.2% tolerance, independent of input rail variation. | Use Scenario: Serving as reference for 8-bit SAR ADCs in portable multimeters and panel meters. IC Role / Device Role / Timing Role: Precision voltage source defining full-scale input range of analog-to-digital conversion. Use Value: Limits quantization error to ≤1 LSB across –40°C to +85°C, supporting 0.4% measurement accuracy. |
| Digital Voltmeter Front-End | Power Supply Monitor Circuit |
Use Scenario: Reference element in handheld digital voltmeters requiring calibrated DC voltage measurement. IC Role / Device Role / Timing Role: Stable 2.5V基准 for scaling input attenuators and digitizing front-end amplifiers. Use Value: Maintains traceable accuracy per ANSI C12.1 over temperature, enabled by 35 ppm/°C max TC and 20 ppm/kHr stability. | Use Scenario: Monitoring 5V/12V rails in telecom power shelves for brownout detection and sequencing control. IC Role / Device Role / Timing Role: Reference input to comparator or supervisor IC detecting out-of-tolerance supply conditions. Use Value: Reduces false trip events by minimizing reference drift-induced hysteresis errors in threshold detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1019CS8#PBF | Bandgap series reference; 0.05% initial accuracy, 5 ppm/°C TC, fixed 2.5V output, no adjust pin. | Higher accuracy and lower drift, but requires series configuration and higher minimum operating current (60 μA min). | Select when ultra-low drift (<0.125 mV over –40°C to +85°C) and long-term stability outweigh need for adjustability. |
| TL431ACDR | Adjustable shunt reference; 1% initial tolerance, 50 ppm/°C TC, 0.22 Ω dynamic impedance, wider current range (1 mA to 100 mA). | Lower cost and broader current capability, but lacks guaranteed industrial temp spec and laser trimming. | Select for cost-sensitive consumer applications where ±1% accuracy and 50 ppm/°C TC are acceptable. |
Compared with LT1019CS8#PBF and TL431ACDR, the LT1009IS8#PBF uniquely balances industrial-temperature guarantee, ±5 mV accuracy, ±5% adjustability, and SO-8 compatibility - making it optimal for calibrated test equipment and industrial DAQ where field calibration and thermal robustness are mandatory.
Availability
LT1009IS8#PBF is available at Aetrix Electronics and suitable for industrial automation, power supply monitoring, and portable instrumentation requiring stable component supply with guaranteed –40°C to +85°C operation and traceable calibration support.
Supply support for LT1009IS8#PBF 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 its precision analog portfolio, including voltage references, op amps, and power management ICs, with focus on high-reliability industrial and aerospace applications.
The LT1009 series belongs to Linear Technology's precision shunt reference product line, designed specifically for applications demanding calibrated accuracy, low drift, and field-adjustable output without external components.
FAQ
What is the operating temperature range specified for LT1009IS8#PBF?
The LT1009IS8#PBF is rated for operation from –40°C to +85°C. This industrial temperature grade is explicitly defined in the ordering information table and confirmed in the Electrical Characteristics section, where parameters like temperature coefficient and voltage stability are guaranteed across this full range - unlike the commercial-grade LT1009S8#PBF (0°C to +70°C).
Can LT1009IS8#PBF replace LM136 in existing designs without layout changes?
Yes, LT1009IS8#PBF is pin-compatible with LM136 in SO-8 packages and functions as a direct drop-in replacement. The LT1009IS8#PBF retains identical pinout (ADJ, NC, NC, NC, +, NC, NC, –), requires no external trim network, and improves upon LM136 with tighter initial tolerance (±5 mV vs ±10 mV) and lower temperature coefficient (35 ppm/°C vs 50 ppm/°C).
Does LT1009IS8#PBF require external capacitors for stability?
No, LT1009IS8#PBF is inherently stable without external capacitors. Its shunt topology and low dynamic impedance (≤0.6 Ω) allow direct connection to load and bypass capacitors only if needed for high-frequency noise suppression - not for loop stability. The typical application circuits in the datasheet show no mandatory capacitor requirements.
What is the maximum reverse current rating for LT1009IS8#PBF?
The absolute maximum reverse current for LT1009IS8#PBF is 20 mA, as stated in the Absolute Maximum Ratings table. For reliable operation, the recommended operating range is 400 μA to 10 mA - ensuring optimal dynamic impedance, temperature coefficient, and long-term stability while maintaining safe junction temperature in the SO-8 package.
How does the ADJ pin on LT1009IS8#PBF affect temperature coefficient?
The ADJ pin on LT1009IS8#PBF allows ±5% output voltage adjustment via external resistors, but the datasheet explicitly states "DOES NOT AFFECT TEMPERATURE COEFFICIENT." This means the 35 ppm/°C max TC remains unchanged regardless of trim setting - a key differentiator from non-laser-trimmed references where adjustment often degrades thermal performance.
LT1009IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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-SO
LT1009IS8#PBF FAQ
1.How can I place an order for LT1009IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1009IS8#PBF 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 LT1009IS8#PBF reliable?
The price and inventory of LT1009IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1009IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1009IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1009IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1009IS8#PBF?
LT1009IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1009IS8#PBF 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 LT1009IS8#PBF?
For technical support, including LT1009IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1009IS8#PBF requirements.
6.How does Aetrix verify that LT1009IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1009IS8#PBF 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 LT1009IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1009IS8#PBF?
All LT1009IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1009IS8#PBF, 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 LT1009IS8#PBF part is unused and in its original packaging.
Return procedure for LT1009IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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