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Analog Devices Inc. LT1027ECH-5
- Part No.:
- LT1027ECH-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
LT1027ECH-5.pdf
- Description:
- IC VREF SERIES 5V TO5
- Quantity:
- Payment:
- Shipping:
Inventory:3,628
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Product details
Overview
LT1027ECH-5 from Analog Devices (formerly Linear Technology) is a precision 5V buried Zener voltage reference in an 8-lead TO-5 metal can package, delivering ±0.005% initial accuracy, 7.5ppm/°C max temperature coefficient over 0°C to 70°C, <1ppmP-P low-frequency noise (0.1Hz–10Hz), and 15mA output sourcing capability. It serves as a high-stability reference for 12- to 16-bit ADC/DAC systems requiring minimal drift under thermal and load transients.
For engineers reviewing the LT1027ECH-5 datasheet, LT1027ECH-5 pinout, LT1027ECH-5 application, or LT1027ECH-5 equivalent, key selection criteria include its sub-10ppm/°C TC grade, TO-5 package thermal performance (θJA = 150°C/W), NR pin noise reduction capability, and compatibility with precision current source and digital voltmeter designs.
Technical Context
The LT1027ECH-5 employs Linear Technology's proprietary subsurface Zener bipolar process to eliminate surface breakdown noise and long-term instability. Its class-B NPN/PNP output stage enables fast transient recovery (<2µs settling for ±10mA AC load steps) while maintaining low output impedance across frequency (≤0.02Ω at DC, <1Ω up to 100kHz).
It integrates a dedicated Noise Reduction (NR) pin allowing external 1µF capacitor connection to reduce wideband RMS noise from 2.0µV to ~1.2µV in 10Hz–1kHz bandwidth, and a VTRIM pin offering ±30mV guaranteed adjustment range without affecting temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±2.5mV (LT1027E grade, 4.995V–5.005V tolerance at 25°C) |
| Temp Coefficient | 7.5ppm/°C max (0°C to 70°C operating range, box-method TC) |
| Output Noise | <1ppmP-P (0.1Hz–10Hz), 2.0µVRMS (10Hz–1kHz) |
| Load Regulation | ±6ppm/mA sourcing (0–15mA), +120ppm/mA sinking (0 to –10mA) |
| Line Regulation | 6ppm/V (8–10V), 3ppm/V (10–40V input range) |
| Supply Current | 3.1mA typical (2.2–3.5mA range), independent of load current |
| Long-Term Stability | 20ppm/month (H-package, measured over time under stable conditions) |
Pinout & Package
LT1027ECH-5 is housed in an 8-lead TO-5 metal can (H package) with hermetic sealing and θJA = 150°C/W. Pins 1–4 and 6–8 are internally connected NC terminals; only VIN (Pin 5), VOUT (Pin 6), VTRIM (Pin 7), NR (Pin 3), and GND (Pin 8) are functional. The NR pin requires a low-leakage 1µF capacitor to ground for optimal noise reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 5) | Input supply terminal | Accepts 8V–40V input; supports ≥35V input-output differential; internal protection limits short-circuit duration to 10 sec if VIN >20V |
| VOUT (Pin 6) | Regulated 5V output | Sources up to 15mA; sinks up to 10mA; low-impedance output enables direct driving of ADC reference inputs |
| VTRIM (Pin 7) | Voltage trim adjust node | 20kΩ impedance, 2.5V open-circuit voltage; ±30mV guaranteed trim range via 10kΩ potentiometer between VOUT and GND |
| NR (Pin 3) | Noise reduction input | Connects to positive input of internal scaling amplifier; 1µF Mylar capacitor to GND reduces 0.1Hz–10Hz noise by >50% |
| GND (Pin 8) | Analog ground reference | Carries only ~2mA quiescent current; suitable as low-side Kelvin sense line to minimize ground loop errors |
Key Features
| Feature | Design Value |
|---|---|
| Buried Zener architecture | Eliminates popcorn noise and surface-related long-term drift; enables 20ppm/month stability in H-package |
| Class-B output stage | Enables <2µs settling for ±10mA AC load transients-critical for successive-approximation ADC reference inputs |
| Dedicated NR pin | Reduces 0.1Hz–10Hz output noise from 3µVP-P to <1µVP-P with 1µF capacitor, improving 16-bit system SNR |
| Kelvin-compatible layout | GND pin carries minimal current; allows separate force-sense routing to mitigate trace resistance errors (e.g., 1.22mV = 1 LSB in 12-bit 5VFS) |
| Trimming without TC penalty | VTRIM adjustment preserves original temperature coefficient-no recalibration needed after output fine-tuning |
Applications
| High-Accuracy Data Acquisition | Digital Voltmeter Reference |
|---|---|
|
Use Scenario: 16-bit SAR ADC (e.g., LTC1290) sampling sensor signals in industrial PLC modules with ambient temperature swings from 0°C to 70°C. IC Role / Device Role / Timing Role: Primary voltage reference supplying REF+ and REF− inputs; defines full-scale conversion range and LSB weight. Use Value: 7.5ppm/°C TC ensures ≤0.5LSB drift over 40°C span-meeting metrology-grade accuracy without calibration compensation. |
Use Scenario: Portable 5½-digit DVM measuring microvolt-level signals with auto-ranging and dual-slope integration. IC Role / Device Role / Timing Role: Stable 5V reference for integrator ramp generation and comparator threshold setting. Use Value: <1ppmP-P 0.1Hz–10Hz noise prevents digit hopping during slow integrations; long-term stability minimizes daily recalibration. |
| Precision Current Source | Reference Standard Calibration |
|
Use Scenario: Programmable 4–20mA transmitter using op-amp-based Howland current pump with 0.01% shunt resistor. IC Role / Device Role / Timing Role: Set-point reference for feedback loop controlling output current magnitude. Use Value: 6ppm/V line regulation ensures current accuracy remains unaffected by 12–24V loop supply variations. |
Use Scenario: Benchtop calibration standard used to verify multimeter and DAQ system accuracy before field deployment. IC Role / Device Role / Timing Role: Primary traceable reference against which other instruments are adjusted. Use Value: 20ppm/month long-term stability and hermetic TO-5 packaging ensure repeatability across quarterly verification cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1021CH-5 | Higher TC (5ppm/°C max), no NR pin, same TO-5 package and pinout | Lacks low-noise optimization; unsuitable where 0.1Hz–10Hz noise dominates error budget | Select when cost sensitivity outweighs sub-10ppm/°C TC and ultra-low noise requirements |
| LT1236CS8-5 | Bandgap-based (not Zener), SO-8 package, 5ppm/°C TC, higher 10Hz–1kHz noise (6µVRMS) | Lower power (1.1mA), wider temp range (–40°C to 85°C), but no NR pin or TO-5 thermal robustness | Prefer for space-constrained PCBs needing extended temperature operation, not metrology-grade stability |
Compared with LT1021CH-5 and LT1236CS8-5, the LT1027ECH-5 uniquely combines buried Zener stability, TO-5 hermetic reliability, and NR-enabled sub-1ppmP-P noise-making it irreplaceable in calibration labs and high-end data acquisition where drift and low-frequency noise are dominant error sources.
Availability
LT1027ECH-5 is available at Aetrix Electronics and suitable for high-accuracy data acquisition, digital voltmeter design, precision current source implementation, and reference standard calibration requiring stable component supply across extended production lifecycles.
Supply support for LT1027ECH-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 full product support, datasheet archives, and application engineering for legacy Linear references including the LT1027 series.
The LT1027 family was designed specifically for high-resolution analog-to-digital and digital-to-analog conversion systems demanding sub-10ppm/°C drift, ultra-low noise, and fast transient response-targeting 12- to 16-bit metrology and instrumentation applications.
FAQ
What is the operating temperature range for the LT1027ECH-5?
The LT1027ECH-5 is specified for operation from 0°C to 70°C-the "C" grade designation in its part number confirms this commercial temperature range. Its maximum junction temperature is 150°C, and thermal resistance is θJA = 150°C/W in the TO-5 metal can package. This range is validated per the electrical characteristics table where TCVOUT, line regulation, and load regulation parameters are guaranteed across 0°C to 70°C.
Does the LT1027ECH-5 require an external capacitor on the NR pin?
Yes-the NR (Noise Reduction) pin of the LT1027ECH-5 must be connected to ground via a low-leakage 1µF capacitor (e.g., Mylar or polypropylene) to achieve its specified <1ppmP-P noise in the 0.1Hz–10Hz band. Without this capacitor, wideband RMS noise rises to 2.0µV in 10Hz–1kHz. Electrolytic capacitors are prohibited due to leakage-just 100nA leakage introduces a 150ppm output error.
Can the LT1027ECH-5 drive a 10kΩ load directly?
Yes-the LT1027ECH-5 can drive a 10kΩ load (500µA at 5V) with negligible error: its load regulation is ±6ppm/mA sourcing, so 0.5mA load induces only ±3ppm (≈15µV) shift. Output impedance is <0.02Ω at DC, and the device maintains stability with all capacitive loads when sourcing current. For best settling time, a 4.7µF tantalum output capacitor is recommended.
How does trimming the output voltage affect the LT1027ECH-5's temperature coefficient?
Trimming the output voltage via the VTRIM pin has no effect on the LT1027ECH-5's temperature coefficient. The datasheet explicitly states that "trimming output voltage does not affect the TC of the device." The ±30mV guaranteed trim range is achieved using a 10kΩ potentiometer between VOUT and GND, leveraging the pin's 20kΩ impedance and 2.5V open-circuit voltage-preserving the original 7.5ppm/°C max TC specification.
Is the LT1027ECH-5 pin-compatible with the LT1021CH-5?
Yes-the LT1027ECH-5 and LT1021CH-5 share identical TO-5 metal can (H) package pinout, pin functions, and mechanical footprint. Both use Pin 5 for VIN, Pin 6 for VOUT, Pin 7 for VTRIM, Pin 3 for NR (LT1021CH-5 ties NR internally), and Pin 8 for GND. However, the LT1021CH-5 lacks the NR pin functionality and has higher 5ppm/°C TC, so functional substitution requires verifying noise and drift requirements.
LT1027ECH-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
LT1027ECH-5 FAQ
1.How can I place an order for LT1027ECH-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1027ECH-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 LT1027ECH-5 reliable?
The price and inventory of LT1027ECH-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1027ECH-5 is usually 5 days.
3.What payment methods are accepted for LT1027ECH-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1027ECH-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1027ECH-5?
LT1027ECH-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1027ECH-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 LT1027ECH-5?
For technical support, including LT1027ECH-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1027ECH-5 requirements.
6.How does Aetrix verify that LT1027ECH-5 is sourced from the original manufacturer or authorized distributors?
All LT1027ECH-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 LT1027ECH-5 meets industry standards.
7.What is the process for return or replacement of LT1027ECH-5?
All LT1027ECH-5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1027ECH-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 LT1027ECH-5 part is unused and in its original packaging.
Return procedure for LT1027ECH-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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