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Analog Devices Inc. LT1027DCH-5
- Part No.:
- LT1027DCH-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
LT1027DCH-5.pdf
- Description:
- IC VREF SERIES 5V TO5
- Quantity:
- Payment:
- Shipping:
Inventory:4,643
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Product details
Overview
LT1027DCH-5 from Analog Devices (formerly Linear Technology) is a precision 5V buried Zener voltage reference in an 8-lead TO-5 metal can package, featuring 2ppm/°C max temperature coefficient, ±0.0025V initial accuracy, and <3µVP-P (0.1Hz–10Hz) output noise. It sources up to 15mA and sinks 10mA, optimized for high-resolution A-to-D converter reference inputs in 12- to 16-bit data acquisition systems.
For engineers reviewing the LT1027DCH-5 datasheet, LT1027DCH-5 pinout, LT1027DCH-5 application, or LT1027DCH-5 equivalent, key selection criteria include low-drift stability over –40°C to 85°C, Kelvin-compatible layout for trace-resistance compensation, NR pin noise filtering capability, and compatibility with fast-settling ADC reference requirements.
Technical Context
The LT1027DCH-5 employs Linear's proprietary subsurface Zener bipolar process to eliminate surface-breakdown noise and long-term drift. Its class-B NPN/PNP output stage enables sub-2µs settling time under ±10mA AC load transients, critical for successive-approximation ADC reference hold phases.
It integrates a dedicated Noise Reduction (NR) pin tied to the internal scaling amplifier's positive input-enabling 1µF capacitor filtering to reduce wideband RMS noise from 2.0µV to ~1.2µV (10Hz–1kHz). The VTRIM pin offers ±30mV guaranteed adjustment range without degrading TC performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±2.5mV (LT1027D grade); ensures ≤0.5LSB error in 12-bit 5VFS systems at 25°C |
| Temp Coefficient (TC) | 2ppm/°C max (–40°C to +85°C); contributes ≤0.32ppm/°C system drift budget in industrial temp range |
| Output Noise (0.1–10Hz) | <3µVP-P; avoids quantization uncertainty in high-dynamic-range DC measurements |
| Line Regulation | 3ppm/V (10–40V input); maintains stability across unregulated supply rails common in analog front-ends |
| Load Regulation | –3 to +6ppm/mA sourcing; compensates for PCB trace resistance via slight negative output impedance (–0.015Ω) |
| Supply Current | 2.2–3.1mA; enables low-power operation while sustaining 15mA output drive capability |
| VTRIM Range | ±30mV guaranteed; allows calibration trimming without affecting TC or long-term stability |
Pinout & Package
LT1027DCH-5 uses the H-package: 8-lead TO-5 metal can with 0.230-inch pin circle diameter, hermetically sealed, θJA = 150°C/W, rated for 150°C max junction temperature. Pin 1 is identified by orientation notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Supply | Accepts 8V–40V; 35V max input-output differential prevents internal overstress |
| VOUT | Reference Output | Low-impedance 5V source/sink node; requires heavy trace or Kelvin connection for <1LSB regulation error |
| VTRIM | Output Adjustment | 20kΩ impedance, 2.5V open-circuit voltage; enables ±30mV trim with 10kΩ potentiometer |
| GND | Analog Ground | Carries only ~2mA quiescent current; suitable as low-side sense return to minimize ground loop errors |
| NR | Noise Reduction | Connects to internal scaling amp+; 1µF capacitor reduces 10Hz–1kHz noise by ~40% |
| NC* | No Connect | Internally connected; external wiring prohibited to avoid parasitic coupling or instability |
Key Features
| Feature | Design Value |
|---|---|
| Subsurface Zener Architecture | Eliminates popcorn noise and 1/f drift mechanisms inherent in surface Zeners, enabling 20ppm/month long-term stability |
| Class-B Output Stage | Enables 2µs settling after ±10mA transient-critical for SAR ADC reference hold recovery without missing codes |
| Dedicated NR Pin | Allows external 1µF capacitor to suppress wideband noise without compromising transient response or stability |
| Negative Output Impedance | –0.015Ω characteristic compensates for typical 100mΩ PCB trace resistance, improving effective load regulation |
| Kelvin-Compatible Layout | GND pin's low current enables use as remote sense return, reducing ground-loop-induced offset in multi-channel systems |
Applications
| High-Resolution Data Acquisition | Calibration Equipment |
|---|---|
Use Scenario: 16-bit isolated analog input module for industrial PLCs measuring 4–20mA sensor signals. IC Role / Device Role / Timing Role: Primary voltage reference for LTC2378-16 SAR ADC, providing stable 5V VREF during conversion cycles. Use Value: 2ppm/°C TC ensures <0.001% full-scale drift over –25°C to 70°C ambient, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: Portable handheld calibrator verifying 4–20mA loop integrity and sensor linearity. IC Role / Device Role / Timing Role: Precision 5V reference for DAC-based current source generation and measurement front-end. Use Value: <3µVP-P low-frequency noise prevents false readings during slow-ramp DC calibration sweeps. |
| Battery-Powered Test Instruments | Military/Aerospace Avionics |
Use Scenario: Handheld digital multimeter with autoranging and true-RMS capability. IC Role / Device Role / Timing Role: Reference for dual-slope integrator and auto-zero amplifier stages. Use Value: 2.2mA supply current enables >100-hour battery life on two AA cells while maintaining 12-bit accuracy. |
Use Scenario: Flight control sensor interface board requiring MIL-STD-810G environmental compliance. IC Role / Device Role / Timing Role: Trusted 5V reference for radiation-tolerant ADCs in inertial measurement units. Use Value: Hermetic TO-5 metal can package ensures reliability under thermal shock (–55°C to +125°C storage) and vibration stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1021-5CH | Same TO-5 package, but 5ppm/°C max TC and ±0.5% initial accuracy; no NR pin | Limited to 10–12-bit systems where cost outweighs drift sensitivity | Choose when legacy design reuse or lower BOM cost is prioritized over sub-ppm stability |
| LT1461ACS8-5 | SO-8 package, 3ppm/°C TC, 0.04% initial accuracy; series topology, 1.2V dropout | Requires ≥6.2V input; unsuitable for high-voltage input rails (>12V) | Prefer for space-constrained PCBs needing LDO-like simplicity, not high-voltage tolerance |
Compared with LT1021-5CH and LT1461ACS8-5, the LT1027DCH-5 uniquely combines hermetic TO-5 ruggedness, ultra-low 2ppm/°C drift, and NR-pin noise filtering-making it irreplaceable in metrology-grade 16-bit systems operating from 8–40V supplies.
Availability
LT1027DCH-5 is available at Aetrix Electronics and suitable for high-precision data acquisition, portable test instrumentation, and aerospace sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1027DCH-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 and maintains its precision analog portfolio, including references, amplifiers, and power management ICs, with focus on high-performance signal conditioning.
The LT1027 family was designed specifically for 12- to 16-bit data conversion systems demanding zero-heater, low-drift, low-noise voltage references-replacing bulkier oven-controlled or heated-substrate solutions.
FAQ
What is the maximum operating temperature range for the LT1027DCH-5?
The LT1027DCH-5 is specified for operation from –40°C to +85°C. This grade (D) is distinct from the C grade (0°C to 70°C) and E grade (–40°C to +85°C with looser TC). Its TO-5 metal can package supports reliable thermal dissipation up to 150°C junction temperature, making LT1027DCH-5 suitable for industrial environments with elevated ambient conditions.
Can the LT1027DCH-5 be used with capacitive loads?
Yes-but with constraints. The LT1027DCH-5 is stable with all capacitive loads when sourcing current or at no DC load. However, when sinking current, oscillation may occur with capacitive loads exceeding 100pF. For optimal settling time and stability, Analog Devices recommends either no output bypass capacitor or a 4.7µF tantalum capacitor-avoiding 0.1µF ceramics which maximize ringing. LT1027DCH-5's class-B output stage defines this behavior.
How does the NR pin on the LT1027DCH-5 reduce noise?
The NR pin connects to the positive input of the internal scaling amplifier. Adding a 1µF Mylar or polypropylene capacitor between NR and ground attenuates wideband noise, reducing RMS noise from 2.0µV to approximately 1.2µV in the 10Hz–1kHz band. This filtering does not affect transient response or stability, and LT1027DCH-5's noise specification explicitly includes this configuration in its 10Hz–1kHz test condition.
Is the LT1027DCH-5 pin-compatible with other LT1027 variants?
Yes-LT1027DCH-5 shares identical pinout and footprint with all H-package LT1027 variants (e.g., LT1027ACH-5, LT1027ECH-5), including VIN, VOUT, VTRIM, GND, NR, and three NC pins. The only differences are electrical grading (TC, initial accuracy) and temperature range. No PCB redesign is needed when upgrading or downgrading within the CH-5 H-package family.
What is the purpose of the VTRIM pin on the LT1027DCH-5?
The VTRIM pin on LT1027DCH-5 provides ±30mV guaranteed adjustment range for fine-tuning output voltage using a 10kΩ potentiometer between VOUT and GND. Its 20kΩ input impedance and 2.5V open-circuit voltage enable precise calibration without impacting temperature coefficient or long-term stability-making LT1027DCH-5 ideal for systems requiring field-trimmable accuracy.
LT1027DCH-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
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- ±0.1%
- 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
LT1027DCH-5 FAQ
1.How can I place an order for LT1027DCH-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1027DCH-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 LT1027DCH-5 reliable?
The price and inventory of LT1027DCH-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1027DCH-5 is usually 5 days.
3.What payment methods are accepted for LT1027DCH-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1027DCH-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1027DCH-5?
LT1027DCH-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1027DCH-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 LT1027DCH-5?
For technical support, including LT1027DCH-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1027DCH-5 requirements.
6.How does Aetrix verify that LT1027DCH-5 is sourced from the original manufacturer or authorized distributors?
All LT1027DCH-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 LT1027DCH-5 meets industry standards.
7.What is the process for return or replacement of LT1027DCH-5?
All LT1027DCH-5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1027DCH-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 LT1027DCH-5 part is unused and in its original packaging.
Return procedure for LT1027DCH-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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