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Analog Devices Inc. LT1389ACS8-1.25#TRPBF
- Part No.:
- LT1389ACS8-1.25#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1389ACS8-1.25#TRPBF.pdf
- Description:
- IC VREF SHUNT 0.05% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,712
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Product details
Overview
LT1389ACS8-1.25#TRPBF from Analog Devices (formerly Linear Technology) is a nanopower precision shunt voltage reference delivering 1.25V nominal output with ±0.05% initial accuracy, 10ppm/°C max temperature drift, 800nA minimum operating current, and <1Ω dynamic impedance. It enables high-accuracy, ultra-low-power biasing in portable instrumentation and precision data converters.
For engineers reviewing the LT1389ACS8-1.25#TRPBF datasheet, LT1389ACS8-1.25#TRPBF pinout, LT1389ACS8-1.25#TRPBF application, or LT1389ACS8-1.25#TRPBF equivalent, key selection criteria include guaranteed drift performance over 0°C to 70°C, sub-1µA startup capability, low-frequency noise (25µVP-P), and SO-8 package compatibility with guard-ring layout for leakage mitigation.
Technical Context
The LT1389ACS8-1.25#TRPBF uses trimmed thin-film resistors and advanced curvature correction to achieve 0.05% initial accuracy and 10ppm/°C max drift across 0°C to 70°C. Its bandgap architecture maintains regulation down to 0.6µA, enabling operation from weak or high-impedance sources.
No output compensation capacitor is required, and it remains stable with capacitive loads up to 0.1µF. Dynamic impedance stays below 1.5Ω (typ. 0.7Ω) from 0.8µA to 2mA, ensuring minimal load-induced voltage shift in precision feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.250 V ±0.05% (±0.625 mV) at 0.8µA, enabling direct use in 12-bit+ ADC/DAC references |
| Tempco | ≤10 ppm/°C max over 0°C to 70°C - ensures ≤0.875 mV total drift across full range |
| Operating Current | 0.6 µA min to 20 mA max - supports battery-powered meters with multi-year runtime |
| Dynamic Impedance | ≤1.5 Ω (guaranteed) - minimizes error from load current variations in closed-loop regulators |
| Low-Frequency Noise | 25 µVP-P (0.1–10 Hz) - critical for high-resolution weigh scales and sensor front-ends |
| Reverse Breakdown Voltage | 1.24937 V to 1.25062 V at 0.8µA - tight distribution simplifies calibration and binning |
| Package | SO-8 (Narrow, 0.150") - industry-standard footprint with 4 DNC pins for guard-ring layout |
Pinout & Package
LT1389ACS8-1.25#TRPBF is housed in an 8-lead plastic SO (narrow, 0.150") package. Four pins are designated DNC (Do Not Connect) and must be guarded at VOUT potential to suppress board leakage; two GND pins provide low-impedance return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 6 | DNC (Do Not Connect) | Internally unconnected; require guard ring tied to VOUT to prevent >2.5nA leakage-induced error |
| 4, 7 | GND | Ground reference terminals; dual connection reduces ground bounce in precision circuits |
| 5 | VOUT | Shunt reference output node; connects to cathode of external series pass element or ADC reference input |
| 8 | Anode / Cathode Reference | Reference terminal for reverse-biased operation; connected to system ground or negative rail in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Nanopower operation | 0.6 µA minimum operating current enables single-cell alkaline or Li-ion battery life exceeding 10 years in sleep-mode instruments |
| Guaranteed drift spec | 10 ppm/°C max over 0°C to 70°C eliminates need for software temperature compensation in field-deployed calibrators |
| Stable with capacitive loads | No external compensation required up to 0.1 µF - simplifies layout in noisy industrial environments |
| Low dynamic impedance | <1.5 Ω ensures <1.5 µV shift per 1 µA load change - essential for 16-bit DAC buffer stability |
| Guard-ring compatible | Four DNC pins allow PCB guard ring at VOUT potential, reducing board leakage error to <0.01% |
Applications
| Portable Meters | Precision Regulators |
|---|---|
|
Use Scenario: Handheld multimeters and clamp meters powered by two AAA alkaline cells with 10+ year shelf life. IC Role / Device Role / Timing Role: Shunt reference providing 1.25V基准 for 24-bit sigma-delta ADC and auto-zero op-amp biasing. Use Value: 800nA operating current extends battery life; 10ppm/°C drift ensures calibration validity across workshop temperature ranges. |
Use Scenario: Low-noise linear regulator for FPGA core supply where reference stability dictates PSRR and ripple rejection. IC Role / Device Role / Timing Role: Precision shunt reference setting feedback voltage of LT1495-buffered LDO with 1.5µA quiescent current. Use Value: 25µVP-P noise prevents reference-induced jitter in clock generation; <1Ω impedance rejects load transients. |
| A/D and D/A Converters | Calibrators |
|
Use Scenario: Portable data acquisition module with 16-bit SAR ADC requiring ratiometric measurement against internal reference. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference input and DAC output buffer gain-setting network. Use Value: ±0.05% initial accuracy eliminates factory trim; low tempco avoids recalibration during thermal soak testing. |
Use Scenario: Benchtop calibration source generating traceable 1.25V outputs for sensor simulators and test fixtures. IC Role / Device Role / Timing Role: Stable, low-drift reference node in programmable current source circuit using LT1495 op-amp and MOSFET. Use Value: 0.6µA min current allows sourcing from high-impedance DAC outputs; guard-ring layout ensures metrology-grade repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1634ACS8-1.25 | Higher 10µA max operating current; same 0.05% accuracy but 20ppm/°C max drift | Less suitable for sub-1µA battery systems; better for higher-current industrial sensors | Select LT1389ACS8-1.25#TRPBF when nanopower operation and guaranteed 10ppm/°C drift are mandatory |
| LT1461ACS8-1.25 | Series reference (not shunt); requires ≥60µA supply; 3ppm/°C drift but needs external pass device | Cannot replace shunt topology directly; demands different PCB layout and bias network | Choose LT1389ACS8-1.25#TRPBF for true shunt configuration with no external components or supply headroom constraints |
Compared with LT1634ACS8-1.25 and LT1461ACS8-1.25, the LT1389ACS8-1.25#TRPBF uniquely delivers sub-1µA operation with 10ppm/°C guaranteed drift in a shunt topology-enabling direct replacement of LM385/LT1004 in legacy ultra-low-power designs without layout or bias changes.
Availability
LT1389ACS8-1.25#TRPBF is available at Aetrix Electronics and suitable for portable meters, precision regulators, and A/D and D/A converters requiring stable component supply, long-term calibration integrity, and ultra-low power consumption.
Supply support for LT1389ACS8-1.25#TRPBF 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. Linear pioneered high-performance voltage references with innovations in curvature correction and thin-film trimming.
The LT1389 family was designed specifically for nanopower, high-accuracy shunt reference applications in portable instrumentation and battery-critical systems-prioritizing drift, startup current, and layout robustness over raw speed or drive strength.
FAQ
What is the minimum operating current for LT1389ACS8-1.25#TRPBF?
The LT1389ACS8-1.25#TRPBF guarantees regulation down to 0.6 µA over the full 0°C to 70°C temperature range. At 25°C, typical startup occurs at 0.8 µA, making it suitable for energy-harvesting and multi-year battery applications. This value is explicitly specified in the Absolute Maximum Ratings table and confirmed in the Electrical Characteristics section under "Minimum Operating Current".
Does LT1389ACS8-1.25#TRPBF require an output capacitor?
No, the LT1389ACS8-1.25#TRPBF does not require an output compensation capacitor and is stable with capacitive loads up to 0.1 µF. The datasheet explicitly states "The LT1389 does not require an output compensation capacitor, but is stable with capacitive loads." This eliminates BOM cost and layout complexity in space-constrained portable designs.
How should the DNC pins on LT1389ACS8-1.25#TRPBF be handled?
The four DNC pins (1, 2, 3, 6) on LT1389ACS8-1.25#TRPBF must remain unconnected but surrounded by a guard ring tied to VOUT. Leakage as low as 1.5 GΩ between a DNC pin and a 5V rail introduces 2.5 nA error - causing >0.2% output shift. Figure 2 in the datasheet shows the recommended guard-ring implementation to ensure metrological accuracy.
What is the guaranteed temperature coefficient for LT1389ACS8-1.25#TRPBF?
The LT1389ACS8-1.25#TRPBF has a guaranteed maximum temperature coefficient of 10 ppm/°C over the full 0°C to 70°C operating range. This is specified in the "1.25V ELECTRICAL CHARACTERISTICS" table under "Temperature Coefficient (G)" and distinguishes it from the B-grade version (LT1389BCS8-1.25), which is rated at 20 ppm/°C max.
Can LT1389ACS8-1.25#TRPBF replace LM385-1.2 in existing designs?
Yes, the LT1389ACS8-1.25#TRPBF is a direct functional upgrade to LM385-1.2, offering superior 0.05% initial accuracy (vs. 1–2%), 10ppm/°C max drift (vs. 50–100ppm/°C), and 800nA operating current (vs. 10–20µA). Pin compatibility is maintained in SO-8, but guard-ring layout is recommended to fully realize its nanopower precision advantage.
LT1389ACS8-1.25#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- 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):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 25µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1389ACS8-1.25#TRPBF FAQ
1.How can I place an order for LT1389ACS8-1.25#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1389ACS8-1.25#TRPBF 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 LT1389ACS8-1.25#TRPBF reliable?
The price and inventory of LT1389ACS8-1.25#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1389ACS8-1.25#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1389ACS8-1.25#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1389ACS8-1.25#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1389ACS8-1.25#TRPBF?
LT1389ACS8-1.25#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1389ACS8-1.25#TRPBF 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 LT1389ACS8-1.25#TRPBF?
For technical support, including LT1389ACS8-1.25#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1389ACS8-1.25#TRPBF requirements.
6.How does Aetrix verify that LT1389ACS8-1.25#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1389ACS8-1.25#TRPBF 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 LT1389ACS8-1.25#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1389ACS8-1.25#TRPBF?
All LT1389ACS8-1.25#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1389ACS8-1.25#TRPBF, 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 LT1389ACS8-1.25#TRPBF part is unused and in its original packaging.
Return procedure for LT1389ACS8-1.25#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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