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Analog Devices Inc. LT1019ACH-4.5
- Part No.:
- LT1019ACH-4.5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
LT1019ACH-4.5.pdf
- Description:
- IC VREF PRECISION 4.5V TO5
- Quantity:
- Payment:
- Shipping:
Inventory:2,305
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Product details
Overview
LT1019ACH-4.5 from Analog Devices (formerly Linear Technology) is a precision bandgap voltage reference IC operating in series or shunt mode with 4.5V nominal output, ±0.05% initial tolerance, 5ppm/°C temperature coefficient over 0°C to 70°C, and ultralow 0.5ppm/V line regulation - used in high-accuracy data acquisition systems requiring stable excitation for bridge sensors and calibration-grade DACs.
For engineers reviewing the LT1019ACH-4.5 datasheet, LT1019ACH-4.5 pinout, LT1019ACH-4.5 application, or LT1019ACH-4.5 equivalent, key selection criteria include guaranteed industrial-grade TC performance, dual-mode operation without external components, trim capability, low output impedance (0.02Ω), and compatibility with legacy references including AD580 and REF-02.
Technical Context
The LT1019ACH-4.5 implements wafer-level trimmed thin-film curvature correction to achieve <5ppm/°C drift across 0°C–70°C and supports both sourcing and sinking up to 10mA. Its architecture enables operation with input/output differential as low as 0.9V in series mode and permits negative-output shunt configurations using external biasing.
It features a dedicated TEMP pin delivering PTAT voltage (~2.1mV/°C) with <0.05%/µA loading sensitivity, and a TRIM pin enabling ±3.5% to ±6% output adjustment depending on voltage variant - confirmed for LT1019-4.5 in H-package configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.5V nominal, stable under ±10mA load in series/shunt mode |
| Initial Tolerance | ±0.05% at 25°C - enables single-point calibration in metrology-grade systems |
| Temp Coefficient | 5ppm/°C (0°C to 70°C box method) - meets Class A instrumentation requirements |
| Line Regulation | 0.5ppm/V - ensures <2.25µV shift per volt input change at 4.5V output |
| Output Impedance | ≈0.02Ω - minimizes load-induced error in precision ratiometric circuits |
| Quiescent Current | 0.65–1.0mA - supports low-power battery-backed reference designs |
| Min Input/Out ΔV | 0.9V @ IOUT ≤ 1mA - allows operation from low-headroom supplies like 5.5V rails |
Pinout & Package
LT1019ACH-4.5 is housed in an 8-lead TO-5 metal can (H package), hermetically sealed for stability in harsh environments. Pin 1 is DNC (internally connected, not to be externally wired); pins 2–8 are INPUT, TEMP, GND, DNC, DNC, OUTPUT, TRIM respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | DNC | Internally connected; no external connection permitted |
| Pin 2 | INPUT | Reference input node - accepts 4.5V+0.9V min in series mode or floating in shunt mode |
| Pin 3 | TEMP | PTAT temperature monitor output (~2.1mV/°C) with <0.05%/µA loading sensitivity |
| Pin 4 | GND | Ground reference for output and internal circuitry - must be low-impedance |
| Pin 5 | DNC | Internally connected; no external connection permitted |
| Pin 6 | DNC | Internally connected; no external connection permitted |
| Pin 7 | OUTPUT | 4.5V regulated output - sources/sinks up to 10mA with 0.02Ω impedance |
| Pin 8 | TRIM | Voltage-adjust input - enables ±3.5% output trimming via external potentiometer |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-corrected bandgap | Reduces parabolic drift to ≤5ppm/°C over 0°C–70°C via thin-film trimming |
| Dual-mode operation | Operates as series or shunt reference without external components - simplifies PCB layout |
| Ultrahigh line rejection | 0.5ppm/V rejection enables stable output even with noisy or varying supply rails |
| Low thermal regulation | 0.5ppm/mW die-gradient sensitivity - critical for high-power or pulsed-load applications |
| 100% noise tested | Guaranteed 2.5ppm RMS (10Hz–1kHz) and 2.5ppm P-P (0.1Hz–10Hz) output noise |
Applications
| Bridge Sensor Excitation | Precision DAC Reference |
|---|---|
Use Scenario: Exciting Wheatstone bridges in strain gauge or pressure transducers where ratio-metric accuracy is essential. IC Role / Device Role / Timing Role: Provides stable 4.5V excitation source referenced to ADC VREF - enabling ratiometric measurement immunity to supply drift. Use Value: 5ppm/°C TC and 0.5ppm/V line regulation ensure <0.005% full-scale error over temperature and line variation. | Use Scenario: Serving as reference for 16-bit+ DACs in automated test equipment requiring monotonicity and low INL. IC Role / Device Role / Timing Role: Precision voltage reference for DAC VREF input - directly defining LSB size and absolute output accuracy. Use Value: ±0.05% initial tolerance and 2.5ppm RMS noise limit DAC integral nonlinearity to <0.5 LSB over full scale. |
| Precision Regulator Feedback | Constant Current Source |
Use Scenario: Setting precise output voltage in low-noise linear regulators for analog signal chains. IC Role / Device Role / Timing Role: High-impedance reference node for op-amp feedback loop - defining regulator setpoint with minimal loading error. Use Value: 0.02Ω output impedance prevents gain error in feedback divider networks, preserving regulation accuracy. | Use Scenario: Generating stable 1mA–10mA current for LED biasing or sensor excitation in portable instruments. IC Role / Device Role / Timing Role: Voltage reference driving precision resistor - converting 4.5V into highly stable current via Ohm's law. Use Value: 0.5ppm/V line regulation ensures current stability remains within ±0.002% despite supply ripple or droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1236CS8-4.5 | Zener-based, 5ppm/°C TC, SO-8 package, higher 1.2mA quiescent current | Better long-term stability but requires higher headroom (≥7V input); not shunt-capable | Choose for ultra-low drift over time in fixed-supply systems where board space favors SO-8 |
| LT1461ACS8-4.5 | Bandgap, 3ppm/°C TC, micropower (50µA IQ), SO-8, max 5mA output | Limited sink/source capability; not rated for shunt mode or >5mA loads | Choose for battery-powered applications needing ultra-low IQ and moderate accuracy, not high-current or dual-mode use |
Compared with LT1236CS8-4.5 and LT1461ACS8-4.5, the LT1019ACH-4.5 uniquely supports both series and shunt operation up to 10mA while maintaining 5ppm/°C TC in a hermetic TO-5 package - making it irreplaceable in ruggedized, high-reliability bridge excitation and calibration hardware.
Availability
LT1019ACH-4.5 is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and aerospace-grade calibration systems requiring stable component supply with traceable lot history and extended lifecycle support.
Supply support for LT1019ACH-4.5 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 (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and precision ICs for demanding measurement and control applications.
The LT1019 product line delivers third-generation bandgap voltage references optimized for metrology-grade accuracy, low thermal drift, and dual-mode flexibility - targeting calibration equipment, precision data converters, and sensor signal conditioning.
FAQ
What is the operating temperature range for the LT1019ACH-4.5?
The LT1019ACH-4.5 is specified for the commercial temperature range of 0°C to 70°C. Its 5ppm/°C temperature coefficient and ±0.05% initial tolerance are guaranteed across this range using the box method. The 'ACH' suffix denotes the H-package (TO-5 metal can) with commercial-grade screening - distinct from industrial ('CH') or military ('MH') variants.
Can the LT1019ACH-4.5 operate in shunt mode with negative output voltage?
Yes, the LT1019ACH-4.5 supports shunt-mode operation with negative output voltage when configured with appropriate external biasing - e.g., connecting OUTPUT to system ground and INPUT to a negative rail. This is explicitly supported per the datasheet and enables use as a negative 4.5V reference, unlike most bandgap devices limited to positive outputs.
What is the minimum input-to-output voltage differential required for LT1019ACH-4.5 in series mode?
The LT1019ACH-4.5 requires a minimum input-to-output voltage differential of 0.9V when load current is ≤1mA, and 1.3V at 10mA. This low headroom enables operation from 5.5V supplies while delivering stable 4.5V - critical for low-voltage precision systems where dropout margin is constrained.
Does the LT1019ACH-4.5 require output capacitance for stability?
No, the LT1019ACH-4.5 is unconditionally stable with all load capacitances for the 4.5V version - unlike the 2.5V variant which can oscillate with 400pF–2µF capacitors under 1–6mA sink conditions. Stability is maintained regardless of ESR or capacitor type, simplifying design in noise-sensitive applications.
How is output voltage trimmed on the LT1019ACH-4.5?
Output voltage trimming on the LT1019ACH-4.5 is performed by connecting a potentiometer between OUTPUT and GND, with its wiper tied to the TRIM pin. The device supports ±3.5% nominal trim range for the 4.5V version - enabling fine calibration to exact system requirements without external op-amps or complex feedback networks.
LT1019ACH-4.5 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):
- 4.5V
- 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-4.5 FAQ
1.How can I place an order for LT1019ACH-4.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1019ACH-4.5 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-4.5 reliable?
The price and inventory of LT1019ACH-4.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1019ACH-4.5 is usually 5 days.
3.What payment methods are accepted for LT1019ACH-4.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1019ACH-4.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1019ACH-4.5?
LT1019ACH-4.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1019ACH-4.5 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-4.5?
For technical support, including LT1019ACH-4.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1019ACH-4.5 requirements.
6.How does Aetrix verify that LT1019ACH-4.5 is sourced from the original manufacturer or authorized distributors?
All LT1019ACH-4.5 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-4.5 meets industry standards.
7.What is the process for return or replacement of LT1019ACH-4.5?
All LT1019ACH-4.5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1019ACH-4.5, 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-4.5 part is unused and in its original packaging.
Return procedure for LT1019ACH-4.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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