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Analog Devices Inc. LT1021DMH-5
- Part No.:
- LT1021DMH-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
LT1021DMH-5.pdf
- Description:
- IC VREF PRECISION 5V TO-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,665
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Product details
Overview
LT1021DMH-5 from Analog Devices (formerly Linear Technology) is a precision 5V buried-zener voltage reference IC with ultralow temperature drift (≤5 ppm/°C max), sub-1 ppmP-P noise (0.1Hz–10Hz), and ±0.05% initial output tolerance. It operates in series or shunt mode, sources/sinks up to 10mA, and is used in high-resolution ADC/DAC calibration, portable metrology standards, and inertial navigation systems requiring long-term stability.
For engineers reviewing the LT1021DMH-5 datasheet, LT1021DMH-5 pinout, LT1021DMH-5 application, or LT1021DMH-5 equivalent, key selection criteria include its 5 ppm/°C max drift over –55°C to 125°C, 100 dB ripple rejection at 150 Hz, 1V minimum input-output differential, trimmable output via dedicated TRIM pin, and compatibility with legacy bandgap references like REF02 and LM368 while delivering superior noise and hysteresis performance.
Technical Context
The LT1021DMH-5 employs a subsurface zener diode structure-eliminating surface-breakdown noise and instability-to achieve better temperature drift and time stability than bandgap references. Its architecture avoids on-chip heaters, enabling ultralow drift without high power dissipation.
It supports dual operating modes: three-terminal series regulation (VIN–VOUT–GND–TRIM) and two-terminal shunt regulation (VOUT–GND), with the TRIM pin providing 13:1 attenuation for precise output adjustment while minimizing TC shift. Input voltage range extends to 40V with 35V max VIN–VOUT differential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V ±0.05% (±2.5 mV) at 25°C - enables direct full-scale calibration of 12-bit+ systems without trimming |
| Temp Coefficient | ≤5 ppm/°C max (–55°C to 125°C) - contributes ≤0.5 LSB error in 12-bit systems over 40°C span |
| Noise (0.1–10 Hz) | <1 µVP-P (≈0.2 ppm) - critical for low-frequency precision measurements and digital voltmeters |
| Ripple Rejection | >100 dB at 150 Hz - suppresses switching regulator noise in mixed-signal PCBs |
| Load Regulation | ≤20 ppm/mA sourcing, ≤100 ppm/mA sinking - maintains accuracy across 0–10 mA load variation |
| Supply Current | 0.8–1.2 mA - enables low-power operation in battery-backed reference standards |
| Long-Term Stability | 15 ppm / 1000 hrs noncumulative - ensures calibration integrity in field-deployed instrumentation |
Pinout & Package
LT1021DMH-5 is housed in an 8-lead TO-5 metal can (H package) with kovar leads, rated for military temperature range (–55°C to 125°C) and θJA = 150°C/W. Pins 1, 3, 4, and 6 are internally connected NC; Pin 5 is the TRIM terminal; Pin 7 is VIN; Pin 8 is VOUT; Pin 2 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 7) | Input supply connection | Accepts 6–40 V; requires ≥1 V headroom above VOUT for regulation |
| VOUT (Pin 8) | Regulated output node | Sources/sinks up to 10 mA; connects to ADC reference input or DAC feedback |
| GND (Pin 2) | Analog ground reference | Carries only ~1 mA quiescent current - suitable as Kelvin sense return in precision layouts |
| TRIM (Pin 5) | Output voltage adjustment | 100 kΩ impedance, 4 V nominal open-circuit voltage, 13:1 attenuation - enables ±70 mV trim range with minimal TC impact |
Key Features
| Feature | Design Value |
|---|---|
| Buried zener topology | Eliminates surface breakdown noise and hysteresis - delivers 3 ppm temperature hysteresis vs. >10 ppm in bandgaps |
| Trim-capable 5V output | TRIM pin allows fine-tuning to exact system requirements (e.g., 5.000 V for 16-bit DAC full-scale) without external op-amps |
| Dual-mode operation | Functions as 3-terminal series reference or 2-terminal shunt zener - simplifies design reuse across regulator and reference topologies |
| High PSRR | 100+ dB ripple rejection up to 1 kHz - maintains reference integrity when powered from noisy DC/DC converters |
| Military-grade reliability | Qualified to –55°C to 125°C with 150°C TJMAX - suitable for avionics, downhole tools, and defense electronics |
Applications
| High-Resolution Data Acquisition | Precision Portable Calibration Standard |
|---|---|
Use Scenario: 16-bit SAR ADC in automated test equipment measuring thermocouple outputs with <1 µV resolution. IC Role / Device Role / Timing Role: Primary voltage reference for ADC internal conversion and external analog front-end gain calibration. Use Value: 5 ppm/°C drift and 0.2 ppm noise ensure <0.5 LSB total error over –20°C to 70°C ambient, eliminating field recalibration. | Use Scenario: Battery-powered handheld multimeter requiring traceable 5.000 V reference for self-calibration. IC Role / Device Role / Timing Role: Stable, low-power reference source powering internal DACs and comparator thresholds. Use Value: 15 ppm/1000 hrs long-term stability and 1.2 mA supply current enable >1 year between calibrations with <10 ppm total drift. |
| Inertial Navigation System Bias Calibration | Digital Voltmeter Front-End Reference |
Use Scenario: Gyro and accelerometer bias compensation in UAV IMUs operating across –40°C to 85°C. IC Role / Device Role / Timing Role: Reference for precision current sources driving MEMS sensor excitation and for ADC digitizing bias correction DACs. Use Value: Sub-1 ppmP-P low-frequency noise prevents integration drift in gyro rate outputs; 100 dB PSRR rejects engine EMI. | Use Scenario: 7½-digit bench DVM requiring 0.1 ppm measurement resolution over 24-hour tests. IC Role / Device Role / Timing Role: Master reference for dual-slope integrator and auto-zero amplifier chains. Use Value: 3 ppm hysteresis and 5 ppm/°C drift ensure repeatability within 0.5 ppm across thermal cycles - meeting ANSI C12.20 Class 0.1 accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5050QPWR | 5 ppm/°C max drift, 1.2 µVRMS (0.1–10 Hz), 3.8 mA supply current, SO-8 package | Lacks shunt-mode capability and TRIM pin; optimized for low-noise op-amp circuits, not zener-replacement use cases | Select when board space is constrained and shunt operation is unnecessary; avoid if replacing LT1021 in existing TO-5 footprints or requiring trim flexibility |
| ADR445ARMZ | 3 ppm/°C max drift, 0.8 µVP-P (0.1–10 Hz), 4.5 mA supply current, MSOP-8 package | No TRIM pin; higher quiescent current; not qualified for military temperature range | Choose for ultra-low-drift lab instruments where extended temp range and trim are secondary; not suitable for avionics or field-deployed gear |
Compared with REF5050QPWR and ADR445ARMZ, the LT1021DMH-5 uniquely combines military-grade temperature range, shunt-mode operation, and a dedicated TRIM pin - making it irreplaceable in legacy aerospace designs and applications demanding both ultralow drift and field-adjustable calibration.
Availability
LT1021DMH-5 is available at Aetrix Electronics and suitable for high-reliability applications including inertial navigation systems, portable metrology standards, and precision data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1021DMH-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 support for the LT® precision analog portfolio, renowned for benchmark performance in references, amplifiers, and power management.
The LT1021 product line was designed specifically for metrology-grade voltage references - prioritizing ultralow drift, buried-zener noise immunity, and long-term stability over cost or integration density.
FAQ
What is the maximum operating temperature range for the LT1021DMH-5?
The LT1021DMH-5 is specified for operation from –55°C to +125°C, with a maximum junction temperature of 150°C. This military-grade temperature range is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The device's thermal resistance (θJA = 150°C/W) and robust TO-5 metal-can package make it suitable for harsh-environment applications such as avionics and downhole instrumentation where the LT1021DMH-5 must maintain 5 ppm/°C drift performance across the full span.
Does the LT1021DMH-5 support shunt-mode operation like a two-terminal zener diode?
Yes, the LT1021DMH-5 supports true two-terminal shunt-mode operation. When the VIN pin is left open, the device regulates between VOUT and GND like a precision zener, maintaining 5.000 V with 1.2 mA minimum shunt current. This capability is explicitly documented in the Applications Information section and distinguishes the LT1021DMH-5 from most bandgap references. In shunt mode, the LT1021DMH-5 retains its 5 ppm/°C drift spec and 100 dB ripple rejection, enabling drop-in replacement of discrete zeners in legacy designs.
What is the function and electrical behavior of the TRIM pin on the LT1021DMH-5?
The TRIM pin (Pin 5) on the LT1021DMH-5 provides a buffered, high-impedance (≈100 kΩ) tap into the internal reference core, with nominal open-circuit voltage of 4 V and 13:1 attenuation to VOUT. Driving this pin with a low-impedance source (≤3 kΩ) enables ±70 mV output adjustment while adding <1 ppm/°C to temperature coefficient - critical for achieving exact 5.000 V calibration in high-accuracy systems. The LT1021DMH-5 datasheet specifies R1 = 27 kΩ and R2 = 50 kΩ for optimal TC tracking, and warns against connecting external circuitry to NC pins (1, 3, 4, 6).
How does the LT1021DMH-5 compare to the LT1021-5 variants in the same H-package family?
The LT1021DMH-5 is the "D" grade (military) version of the 5V LT1021 in the H-package, distinguished by its tighter initial tolerance (±0.05% vs. ±0.1% for "C" grade) and guaranteed performance over –55°C to 125°C. Unlike the LT1021BCH-5 or LT1021CMH-5, the "D" grade undergoes additional screening for long-term stability and thermal hysteresis. All H-package variants share identical pinout, 150°C/W thermal resistance, and buried-zener architecture - but only the LT1021DMH-5 guarantees ≤5 ppm/°C drift across the full military temperature range.
Can the LT1021DMH-5 be used with capacitive loads, and what is the recommended output capacitance?
Yes, the LT1021DMH-5 is unconditionally stable with all capacitive loads, but optimal transient response requires COUT < 1000 pF. The datasheet Load Transient Response curves show worst-case settling occurs near ILOAD = 0 mA for the LT1021DMH-5, improving significantly when sourcing >2 mA. For critical applications, a 10 µF solid tantalum capacitor with 2–5 Ω series resistance is recommended to dampen ringing and reduce noise coupling. Exceeding 1000 pF increases settling time but does not cause oscillation - a key advantage over many CMOS references.
LT1021DMH-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, Buried Zener
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- ±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
LT1021DMH-5 FAQ
1.How can I place an order for LT1021DMH-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1021DMH-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 LT1021DMH-5 reliable?
The price and inventory of LT1021DMH-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1021DMH-5 is usually 5 days.
3.What payment methods are accepted for LT1021DMH-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1021DMH-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1021DMH-5?
LT1021DMH-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1021DMH-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 LT1021DMH-5?
For technical support, including LT1021DMH-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1021DMH-5 requirements.
6.How does Aetrix verify that LT1021DMH-5 is sourced from the original manufacturer or authorized distributors?
All LT1021DMH-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 LT1021DMH-5 meets industry standards.
7.What is the process for return or replacement of LT1021DMH-5?
All LT1021DMH-5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1021DMH-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 LT1021DMH-5 part is unused and in its original packaging.
Return procedure for LT1021DMH-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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