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Analog Devices Inc. LT1019ACH-2.5
- Part No.:
- LT1019ACH-2.5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
LT1019ACH-2.5.pdf
- Description:
- IC VREF PRECISION 2.5V TO5
- Quantity:
- Payment:
- Shipping:
Inventory:2,779
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Product details
Overview
LT1019ACH-2.5 from Analog Devices (formerly Linear Technology) is a precision 2.5V bandgap voltage reference IC capable of sourcing and sinking up to 10mA in series or shunt mode, with ±0.05% initial output tolerance, 5ppm/°C temperature coefficient over 0°C to 70°C, and ultralow 0.5ppm/V line regulation - used in high-resolution ADC/DAC calibration, precision regulators, and bridge excitation circuits.
For engineers reviewing the LT1019ACH-2.5 datasheet, LT1019ACH-2.5 pinout, LT1019ACH-2.5 application, or LT1019ACH-2.5 equivalent, key selection considerations include its dual-mode operation (series/shunt), wafer-level trimmed curvature correction, 0.02Ω output impedance, 100% noise testing, and compatibility with legacy references including AD580 and REF-02.
Technical Context
The LT1019ACH-2.5 implements third-generation thin-film bandgap architecture with curvature correction applied at wafer level, enabling tight TC and low drift without external compensation. Its internal trim network allows ±6% output adjustment, and the TEMP pin provides PTAT voltage (~2.1mV/°C) with <0.05%/µA loading sensitivity.
It operates across input/output differentials as low as 0.9V in series mode and supports stable 2.5V output under full 10mA load. Thermal regulation is specified at 0.5ppm/mW, distinct from bulk die temperature drift, and ripple rejection exceeds 90dB from 50Hz to 400Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal, ±0.05% initial tolerance - enables direct replacement in 2.5V reference slots without recalibration. |
| Temp Coefficient | 5ppm/°C (0°C to 70°C) - ensures ≤125ppm total drift across commercial range, critical for metrology-grade systems. |
| Line Regulation | 0.5ppm/V - translates to <1.25µV change per 2.5V input shift, supporting stable operation under varying supply conditions. |
| Output Impedance | ≈0.02Ω - maintains <200µV error at 10mA load step, essential for driving low-impedance DAC reference inputs. |
| Load Regulation | 0.05mV/mA (series mode) - guarantees <500µV shift over full 10mA sourcing range, preserving accuracy in active regulator feedback paths. |
| Noise (10Hz–1kHz) | 2.5ppm RMS (6.25µV) - low enough to avoid degrading ENOB in 16-bit+ data converters. |
| Quiescent Current | 0.65–1.0mA - balances low power with high drive capability, suitable for battery-backed precision instruments. |
Pinout & Package
LT1019ACH-2.5 is housed in an 8-lead TO-5 metal can (H package), with hermetic sealing and case-grounded thermal path. Pin 5 is GND (case), pins 1/2/4 are internally connected DNC terminals, and functional pins are INPUT (pin 3), OUTPUT (pin 7), TRIM (pin 6), and TEMP (pin 8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 3 (INPUT) | Reference input node | Accepts 2.5V to 7V supply in series mode; floats in shunt mode - minimum VIN–VOUT = 0.9V enables low-headroom operation. |
| Pin 7 (OUTPUT) | 2.5V regulated output | Sources/sinks up to 10mA; low 0.02Ω impedance minimizes IR drop in precision current sources and A/D converter references. |
| Pin 6 (TRIM) | Voltage trim control | Accepts external potentiometer for ±6% output adjustment - compatible with existing AD580/REF-02 trim networks. |
| Pin 8 (TEMP) | PTAT temperature monitor | Outputs ~2.1mV/°C (620mV at 25°C); loading <0.05%/µA avoids reference perturbation - usable for thermal compensation loops. |
| Pin 5 (GND) | Case ground / thermal sink | Electrically and thermally connected to metal can - must be tied to system ground for stability and thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-corrected bandgap | Wafer-level trimming eliminates parabolic drift - achieves 5ppm/°C box TC vs. >10ppm/°C in uncorrected references. |
| Dual-mode operation | Operates as series reference (low-dropout) or shunt reference (negative-output capable) - no external components needed for either topology. |
| Ultrahigh line rejection | 0.5ppm/V line regulation - reduces sensitivity to supply ripple in noisy industrial environments without additional filtering. |
| 100% noise tested | Each unit screened for 2.5ppm RMS (10Hz–1kHz) output noise - ensures suitability for 16-bit+ SAR and sigma-delta converters. |
| Plug-in replacement | Pin- and function-compatible with AD580, AD581, REF-01, REF-02, MC1400, MC1404, LM168 - enables drop-in upgrade with no layout change. |
Applications
| High-Resolution Data Acquisition | Precision Bridge Sensing |
|---|---|
|
Use Scenario: 16-bit ADC system requiring stable, low-noise reference for strain gauge measurements in structural health monitoring. IC Role / Device Role / Timing Role: 2.5V reference source for ADC VREF input and bridge excitation voltage. Use Value: 0.05% initial tolerance and 5ppm/°C TC ensure <±0.01% full-scale error over temperature, while 0.02Ω output impedance prevents loading-induced gain shift. |
Use Scenario: Wheatstone bridge with 350Ω elements in load cell interface, requiring matched excitation and reference voltages. IC Role / Device Role / Timing Role: Dual-use as bridge excitation source and ADC reference to eliminate ratiometric errors. Use Value: Identical TC and low thermal regulation (0.5ppm/mW) minimize drift between excitation and reference paths, improving long-term zero stability. |
| Calibrated Precision Regulator | Low-Drift DAC Reference |
|
Use Scenario: Programmable lab-grade power supply with digital setpoint control and ±0.02% output accuracy requirement. IC Role / Device Role / Timing Role: Feedback reference for op-amp-controlled pass transistor, trimmed via TRIM pin to exact setpoint. Use Value: ±6% trim range enables precise factory calibration; 0.5ppm/V line regulation prevents output drift during AC line variations. |
Use Scenario: Industrial 16-bit DAC in PLC analog output module needing monotonicity and low INL over temperature. IC Role / Device Role / Timing Role: Primary reference for DAC internal ladder or external buffer amplifier. Use Value: 2.5ppm RMS noise and <500µV load regulation error preserve DAC's 1LSB accuracy across full current range. |
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#PBF | 5V Zener-based reference; 0.5ppm/°C TC, lower noise (1.2ppm RMS), but fixed 5V output and no shunt mode. | Requires resistive divider for 2.5V use - adds TC error and noise; unsuitable for shunt-mode or negative-reference topologies. | Select when ultimate TC and noise performance are prioritized over flexibility and 2.5V native output. |
| LT1461ACS8-2.5#PBF | 2.5V bandgap; 3ppm/°C TC, 50µA quiescent current, but only 5mA max output and no TRIM pin. | Limited drive strength precludes use in high-current regulators or bridge excitation; no factory trim capability. | Select for ultra-low-power portable instrumentation where 10mA drive and ±6% trim are unnecessary. |
Compared with LT1027CS8-5#PBF and LT1461ACS8-2.5#PBF, the LT1019ACH-2.5 uniquely combines native 2.5V output, 10mA bidirectional drive, ±6% trim, and shunt/series dual-mode operation - making it the only option for legacy-compatible, high-flexibility precision reference designs.
Availability
LT1019ACH-2.5 is available at Aetrix Electronics and suitable for high-accuracy data acquisition, precision sensor excitation, and calibrated power supply applications requiring stable component supply across extended product lifecycles.
Supply support for LT1019ACH-2.5 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 precision ICs, serving aerospace, industrial, medical, and communications markets since 1965.
The LT1019 product line was designed specifically for metrology-grade voltage reference applications demanding sub-0.1% accuracy, ultralow drift, and field-replaceable compatibility with legacy bandgap references.
FAQ
What is the operating temperature range for the LT1019ACH-2.5?
The LT1019ACH-2.5 is rated for the commercial temperature range of 0°C to 70°C. Its specifications - including ±0.05% initial tolerance and 5ppm/°C temperature coefficient - are guaranteed across this full range. The "ACH" suffix explicitly denotes the commercial-grade H-package variant, distinct from industrial (I) or military (M) versions.
Can the LT1019ACH-2.5 be used in shunt mode for negative voltage references?
Yes, the LT1019ACH-2.5 supports true shunt-mode operation, enabling implementation of negative reference topologies. When configured with the INPUT terminal floating and OUTPUT tied to a negative rail, it regulates a stable –2.5V relative to ground - as confirmed in the Typical Applications section (Figure TA10) and Absolute Maximum Ratings table.
What is the purpose of the TEMP pin on the LT1019ACH-2.5?
The TEMP pin on the LT1019ACH-2.5 outputs a PTAT voltage (~2.1mV/°C, ~620mV at 25°C) for relative temperature monitoring. Its design isolates the sensing node from the reference core, limiting output voltage perturbation to <0.05%/µA loading - a tenfold improvement over prior bandgap references and enabling direct connection to high-impedance monitoring circuits.
Does the LT1019ACH-2.5 require output capacitance for stability?
The LT1019ACH-2.5 is stable without output capacitance in series mode. However, the 2.5V version can oscillate when sinking 1–6mA into 400pF–2µF capacitive loads. For bypassing, use configuration (a) with a series resistor (2–5Ω) and tantalum capacitor to maintain DC accuracy, or configuration (b) for optimal transient response - both detailed in Figure F01 of the datasheet.
How does the LT1019ACH-2.5 compare to the LT1019CH-2.5?
The LT1019ACH-2.5 offers tighter specifications than the LT1019CH-2.5: ±0.05% vs. ±0.2% initial tolerance and 5ppm/°C vs. 20ppm/°C temperature coefficient over 0°C to 70°C. Both share the same H-package and pinout, but the "A" grade undergoes additional wafer-level trimming - making LT1019ACH-2.5 the preferred choice for applications demanding highest initial accuracy and lowest drift.
LT1019ACH-2.5 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):
- 2.5V
- 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-2.5 FAQ
1.How can I place an order for LT1019ACH-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1019ACH-2.5 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-2.5 reliable?
The price and inventory of LT1019ACH-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1019ACH-2.5 is usually 5 days.
3.What payment methods are accepted for LT1019ACH-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1019ACH-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1019ACH-2.5?
LT1019ACH-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1019ACH-2.5 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-2.5?
For technical support, including LT1019ACH-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1019ACH-2.5 requirements.
6.How does Aetrix verify that LT1019ACH-2.5 is sourced from the original manufacturer or authorized distributors?
All LT1019ACH-2.5 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-2.5 meets industry standards.
7.What is the process for return or replacement of LT1019ACH-2.5?
All LT1019ACH-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1019ACH-2.5, 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-2.5 part is unused and in its original packaging.
Return procedure for LT1019ACH-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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