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Analog Devices Inc. LT1019ACH-5
- Part No.:
- LT1019ACH-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
LT1019ACH-5.pdf
- Description:
- IC VREF PRECISION 5V TO5
- Quantity:
- Payment:
- Shipping:
Inventory:2,189
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Product details
Overview
LT1019ACH-5 from Analog Devices (formerly Linear Technology) is a precision 5V bandgap voltage reference IC designed for high-stability analog signal chains. It delivers ±0.05% initial output voltage tolerance, 5ppm/°C temperature coefficient over 0°C to 70°C, ultralow 0.5ppm/V line regulation, and supports both series and shunt operation modes - enabling use in positive or negative output configurations without external components. It is deployed in high-resolution ADC/DAC calibration circuits requiring stable excitation and low-drift biasing.
For engineers reviewing the LT1019ACH-5 datasheet, LT1019ACH-5 pinout, LT1019ACH-5 application, or LT1019ACH-5 equivalent, this page provides verified technical context, package-specific pin definitions, real-world application mappings, and validated alternative options for precision reference selection in industrial instrumentation and data acquisition systems.
Technical Context
The LT1019ACH-5 implements third-generation curvature-corrected bandgap architecture with wafer-level thin-film trimming of both reference and output stages. Its dual-mode operation (series/shunt) enables flexible integration into regulator feedback paths or as a standalone shunt reference, with <1.1V minimum input-output differential in series mode and full 10mA sink/source capability.
It features a dedicated TEMP pin providing PTAT voltage (~2.1mV/°C) with <0.05%/µA loading sensitivity, and a TRIM pin supporting ±3.5% to –13% output adjustment range. Thermal regulation is specified at 0.5ppm/mW to quantify die-gradient-induced drift under dynamic load or line transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V ±0.05% (tight initial accuracy enables direct use in 16-bit DAC reference without post-calibration) |
| Temp Coefficient | 5 ppm/°C max (0°C to 70°C) - ensures ≤35ppm total drift across commercial temperature range |
| Line Regulation | 0.5 ppm/V typical - maintains stability even with ±5V input variation in unregulated supplies |
| Load Regulation | 0.05 mV/mA (series mode) - supports dynamic load changes up to 10mA with sub-500µV error |
| Output Impedance | ≈0.02 Ω - enables low-noise buffering and minimizes IR drop in precision current sources |
| Quiescent Current | 0.65–1.0 mA - balances low power consumption with fast settling and low thermal self-heating |
| Noise (10Hz–1kHz) | 2.5 ppm RMS - suitable for 18-bit ADC systems where reference noise dominates SNR budget |
Pinout & Package
LT1019ACH-5 is housed in an 8-lead TO-5 metal can (H package), hermetically sealed for long-term stability and low humidity sensitivity. The package features a grounded metal case (Pin 5) and three internally connected, no-connect pins (Pins 1, 4, 6) - all must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 2 (INPUT) | Reference input node | Accepts input voltage ≥6V in shunt mode; ≥6V in series mode (VOUT + 1.1V min); connects to unregulated supply rail |
| Pin 3 (TEMP) | PTAT temperature monitor | Provides ~2.1mV/°C output for relative temp sensing; loading <0.05%/µA avoids reference perturbation |
| Pin 5 (GND) | Case ground / thermal path | Electrically and thermally connected to metal can; must be tied to system ground for stability and EMI control |
| Pin 7 (OUTPUT) | Precision 5V reference output | Delivers regulated 5V with <0.02Ω impedance; capable of sourcing/sinking up to 10mA continuously |
| Pin 8 (TRIM) | Voltage trim control | Accepts external potentiometer to adjust output by +3.5% to –13%; enables calibration to exact system requirements |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-corrected bandgap | Reduces parabolic drift to ≤5ppm/°C box specification - eliminates need for external compensation networks |
| Dual-mode operation | Operates as series or shunt reference without added components - simplifies design for bipolar or single-supply systems |
| Ultrahigh line rejection | 0.5ppm/V line regulation enables use with noisy or poorly regulated supplies without additional filtering |
| Low thermal regulation | 0.5ppm/mW sensitivity allows accurate prediction and compensation of power-dissipation-induced drift |
| 100% noise tested | Guaranteed 2.5ppm RMS (10Hz–1kHz) output noise - meets SNR requirements for 18-bit SAR and sigma-delta converters |
Applications
| High-Accuracy Data Acquisition | Industrial Precision Regulators |
|---|---|
|
Use Scenario: 16-bit simultaneous-sampling ADC module in programmable logic controller (PLC) analog input card. IC Role / Device Role / Timing Role: Primary reference for ADC internal conversion core and external sensor signal conditioning amplifiers. Use Value: ±0.05% initial tolerance and 5ppm/°C TC ensure full-scale error remains <0.01% across 0°C–70°C ambient, eliminating field recalibration. |
Use Scenario: Feedback reference in low-noise, adjustable 5V/3A linear regulator for test equipment power supply. IC Role / Device Role / Timing Role: Stable voltage setpoint source for op-amp error amplifier in series-pass regulator loop. Use Value: 0.02Ω output impedance prevents load-induced reference sag; 10mA drive capability supports heavy feedback network loading. |
| Bridge Sensor Excitation | Precision Constant Current Sources |
|
Use Scenario: Excitation source for 350Ω Wheatstone bridge in strain-gauge-based load cell interface. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source driving bridge top rail with matched current sourcing/sinking. Use Value: 2.5ppm RMS noise and <5ppm/°C TC prevent bridge output drift from masking micro-strain signals (<10µε resolution). |
Use Scenario: Reference element in 1µA–10mA programmable current source for photodiode biasing in optical spectrometers. IC Role / Device Role / Timing Role: Precision voltage reference feeding transconductance amplifier to generate highly stable output current. Use Value: Load regulation of 0.05mV/mA ensures current accuracy holds to ±0.005% over full 10mA range, independent of compliance voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1027CS8-5 | Zener-based topology; 1.2ppm/°C max TC (0°C–70°C); 0.01% initial tolerance; SO-8 package | Lower drift but higher cost and limited to positive-only operation; requires ≥8V input | Choose when ultra-low TC is critical and input headroom ≥8V is available; not suitable for shunt or negative-rail use. |
| LT1461ACS8-5 | Bandgap-based; 3ppm/°C max TC; 0.04% initial tolerance; 50µA quiescent current; SO-8 package | Lower power but reduced drive strength (10mA max sink only); no TRIM or TEMP pins | Choose for battery-powered or space-constrained designs where 10mA sourcing is unnecessary and trimming is not required. |
Compared with LT1019ACH-5, LT1027CS8-5 offers superior temperature stability but sacrifices flexibility in operating mode and input voltage range, while LT1461ACS8-5 reduces power and size at the expense of trim capability and bidirectional current drive - making LT1019ACH-5 the optimal choice for general-purpose, high-flexibility precision reference needs.
Availability
LT1019ACH-5 is available at Aetrix Electronics and suitable for high-accuracy data acquisition, industrial precision regulators, bridge sensor excitation, and precision constant current sources requiring stable component supply across extended product lifecycles.
Supply support for LT1019ACH-5 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 (via acquisition of Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and medical markets.
The LT1019 family was engineered as a third-generation precision bandgap reference targeting metrology-grade stability in harsh environments, with emphasis on low TC, dual-mode operation, and robustness against line/load transients.
FAQ
What is the operating temperature range for the LT1019ACH-5?
The LT1019ACH-5 is rated for the commercial temperature range of 0°C to 70°C. Its key specifications - including ±0.05% initial output voltage tolerance and 5ppm/°C maximum temperature coefficient - are guaranteed across this full range. This makes the LT1019ACH-5 suitable for indoor industrial and test equipment applications where ambient conditions remain within these bounds.
Can the LT1019ACH-5 be used in shunt mode with a negative output voltage?
Yes, the LT1019ACH-5 supports true shunt-mode operation with negative output voltages. When configured as a shunt reference, its OUTPUT pin becomes the cathode, allowing it to regulate a negative rail (e.g., –5V) referenced to ground. The device sinks up to 10mA in this configuration, and no external components are required - a key advantage over earlier bandgap references.
What is the purpose of the TEMP pin on the LT1019ACH-5?
The TEMP pin on the LT1019ACH-5 provides a PTAT (proportional-to-absolute-temperature) voltage output of approximately 2.1mV/°C, nominally ~620mV at 25°C. It is intended for relative temperature monitoring - not absolute measurement - and exhibits <0.05%/µA loading sensitivity, minimizing impact on reference accuracy. This enables on-chip thermal diagnostics without degrading LT1019ACH-5 performance.
How much output voltage adjustment is possible using the TRIM pin on the LT1019ACH-5?
The TRIM pin on the LT1019ACH-5 supports an output voltage adjustment range of +3.5% to –13% around the nominal 5.000V output. This wide range accommodates system-level calibration and compensates for downstream gain errors. For example, trimming to 5.120V (a common requirement for 12-bit DAC full-scale alignment) is fully supported using a standard 5kΩ cermet potentiometer with appropriate series resistors.
Is the LT1019ACH-5 stable with large output capacitance?
Yes, the LT1019ACH-5 is stable with all values of output capacitance when configured in 4.5V, 5V, or 10V versions - unlike the 2.5V variant. No external compensation is required, and it remains stable even with ≥10µF tantalum or ceramic capacitors. This simplifies filtering in noise-sensitive applications such as high-resolution ADC reference decoupling without risking oscillation.
LT1019ACH-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- TO-205-8, TO-5-8 Metal Can
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Series, Shunt
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-5
LT1019ACH-5 FAQ
1.How can I place an order for LT1019ACH-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1019ACH-5 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 LT1019ACH-5 reliable?
The price and inventory of LT1019ACH-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1019ACH-5 is usually 5 days.
3.What payment methods are accepted for LT1019ACH-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1019ACH-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1019ACH-5?
LT1019ACH-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1019ACH-5 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 LT1019ACH-5?
For technical support, including LT1019ACH-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1019ACH-5 requirements.
6.How does Aetrix verify that LT1019ACH-5 is sourced from the original manufacturer or authorized distributors?
All LT1019ACH-5 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 LT1019ACH-5 meets industry standards.
7.What is the process for return or replacement of LT1019ACH-5?
All LT1019ACH-5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1019ACH-5, 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 LT1019ACH-5 part is unused and in its original packaging.
Return procedure for LT1019ACH-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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