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Analog Devices Inc. LT1021DMH-7
- Part No.:
- LT1021DMH-7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
LT1021DMH-7.pdf
- Description:
- IC VREF PRECISION 7V TO-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,631
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Product details
Overview
LT1021DMH-7 from Analog Devices (formerly Linear Technology) is a precision 7V buried-zener voltage reference IC operating in series or shunt mode, delivering ±0.05% initial accuracy, 3 ppm/°C max temperature coefficient, <4 µVP-P (0.1–10 Hz) noise, >100 dB ripple rejection, and ±10 mA output sourcing/sinking capability. It serves as the primary voltage基准 in high-resolution 16-bit ADCs for industrial data acquisition systems.
For engineers reviewing the LT1021DMH-7 datasheet, LT1021DMH-7 pinout, LT1021DMH-7 application, or LT1021DMH-7 equivalent, key selection criteria include long-term stability (7 ppm/1000 hrs), minimal thermal hysteresis (3 ppm), absence of trim pin (enabling superior TC consistency), and compatibility with low-noise Kelvin-sensing layouts in metrology-grade instrumentation.
Technical Context
The LT1021DMH-7 uses a subsurface zener diode structure-eliminating surface-breakdown noise and drift-to achieve ultralow temperature hysteresis and time stability superior to bandgap references. Its architecture omits resistive dividers, directly generating 7V output for optimal long-term drift performance.
No internal trim pin exists; trimming must be performed externally using potentiometric methods to preserve TC integrity. The device supports dual-mode operation: three-terminal series regulation (VIN–VOUT–GND) and two-terminal shunt regulation (VOUT–GND), with minimum input/output differential of 1 V and 10 mA load current capability in both modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 6.95 V to 7.05 V - Ensures full-system calibration margin within ±0.7% window at 25°C. |
| Temp Coefficient | 3 ppm/°C max - Limits reference-induced error to ≤0.5 LSB in 12-bit systems over 40°C span. |
| Long-Term Stability | 7 ppm / 1000 hrs - Enables unadjusted field deployment in portable calibration standards for ≥1 year. |
| Output Noise | 4 µVP-P (0.1–10 Hz) - Supports sub-16-bit ENOB in precision digitizers without external filtering. |
| Ripple Rejection | >100 dB at 150 Hz - Rejects switching regulator noise in mixed-signal PCBs without LC filtering. |
| Load Regulation | 25 ppm/mA (sourcing) - Maintains accuracy across 0–10 mA load variation in DAC reference buffers. |
| Operating Temp | –40°C to 85°C - Qualified for industrial embedded controllers and automotive test equipment. |
Pinout & Package
LT1021DMH-7 is housed in an 8-lead TO-5 metal can (H package) with hermetic sealing and kovar leads optimized for low thermal EMF. Pin 5 is internally unused (NC) and must remain unconnected per datasheet Note.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally bonded; no external connection permitted. |
| 2 (VIN) | Input Supply | Accepts 8.5–40 V; minimum 1 V headroom required for regulation. |
| 3 (NC) | No Connect | Internally bonded; no external connection permitted. |
| 4 (VOUT) | Reference Output | 7 V precision node; sources/sinks ±10 mA; Kelvin sensing recommended. |
| 5 (NC) | No Connect | No trim pin - eliminates TC degradation from external trimming circuits. |
| 6 (GND) | Ground Reference | Carries only ~1 mA quiescent current; ideal for low-impedance sense return path. |
| 7 (NC) | No Connect | Internally bonded; no external connection permitted. |
| 8 (NC) | No Connect | Internally bonded; no external connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Buried Zener Architecture | Eliminates surface breakdown noise and drift, enabling 4 µVP-P low-frequency noise and 3 ppm hysteresis. |
| No Trim Pin | Removes TC degradation pathway - delivers best-in-class 3 ppm/°C max TC without external component trade-offs. |
| Dual-Mode Operation | Functions as 3-terminal series regulator or 2-terminal shunt zener, simplifying design reuse across power architectures. |
| Kelvin-Sensing Ready | GND pin carries only 1 mA; enables true 4-wire reference routing to eliminate PCB trace IR errors. |
| Thermal EMF Mitigation | Requires air-shielding (e.g., foam cup) around TO-5 package to suppress thermocouple-induced noise in 0.01–1 Hz band. |
Applications
| High-Resolution Data Acquisition | Precision Digital Voltmeters |
|---|---|
Use Scenario: 16-bit SAR ADC front-end in automated test equipment measuring sensor outputs with ±10 ppm full-scale accuracy. IC Role / Device Role / Timing Role: Primary voltage reference establishing absolute scale for analog-to-digital conversion. Use Value: 3 ppm/°C TC and 7 ppm/1000 hrs stability ensure calibration validity over 12-month intervals without recalibration. | Use Scenario: Benchtop DVM requiring 7½-digit resolution and <10 ppm/year drift specification. IC Role / Device Role / Timing Role: Master reference source for auto-zeroed integrator stages and ratiometric scaling circuits. Use Value: Buried-zener noise floor (<4 µVP-P) enables sub-1 µV RMS measurement resolution in 0.1–10 Hz bandwidth. |
| Inertial Navigation Systems | Portable Calibration Standards |
Use Scenario: Gyro bias compensation circuitry in aerospace IMUs operating across –40°C to 85°C ambient range. IC Role / Device Role / Timing Role: Stable excitation source for MEMS gyro drive electrodes and signal chain gain-setting resistors. Use Value: 100 dB ripple rejection prevents switching noise from DC-DC converters from modulating gyro output signals. | Use Scenario: Handheld field calibrator used to verify pressure transmitters and RTD sensors in oil & gas facilities. IC Role / Device Role / Timing Role: Transportable voltage standard traceable to NIST via on-board self-test routines. Use Value: Hermetic TO-5 package ensures long-term stability under vibration, humidity, and thermal cycling conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5070IDR | 7 V bandgap reference; 3 ppm/°C TC; 1.2 µVRMS (10 Hz–1 kHz); requires external 10 µF bypass capacitor. | Lower noise in mid-band but higher 0.1–10 Hz noise (6 µVP-P); no shunt-mode capability. | Select REF5070IDR when mid-band noise dominates system error budget and board space permits larger bypass cap. |
| ADR447BRZ | 7 V XFET reference; 2 ppm/°C TC; 3.5 µVP-P (0.1–10 Hz); 10 mA output; SOIC-8 package. | Superior TC spec but lacks shunt-mode operation; plastic package limits long-term stability vs. hermetic TO-5. | Select ADR447BRZ when TC is critical and hermeticity is not required for field lifetime. |
Compared with REF5070IDR and ADR447BRZ, the LT1021DMH-7 uniquely combines buried-zener low-frequency noise, shunt-mode flexibility, and hermetic TO-5 reliability-making it irreplaceable in portable metrology tools where 0.1–10 Hz drift and mechanical robustness define system-level performance.
Availability
LT1021DMH-7 is available at Aetrix Electronics and suitable for high-precision data acquisition, portable calibration standards, and inertial navigation systems requiring stable component supply across extended product lifecycles.
Supply support for LT1021DMH-7 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 legacy Linear precision analog products.
The LT1021 family was designed specifically for metrology-grade applications demanding ultralow drift, buried-zener noise performance, and hermetic reliability-targeting 16-bit+ data converters, calibration equipment, and aerospace sensor interfaces.
FAQ
What is the maximum allowable input voltage for LT1021DMH-7?
The absolute maximum input voltage for LT1021DMH-7 is 40 V. However, for reliable long-term operation, the recommended maximum is 35 V to maintain safe junction temperature margins. Input-to-output differential must remain ≥1 V for regulation; typical operating VIN is 8.5–12 V in series mode. Exceeding 35 V risks accelerated aging of the buried zener structure, potentially degrading the 7 ppm/1000 hrs long-term stability spec of the LT1021DMH-7.
Does LT1021DMH-7 have a trim pin, and how is output adjustment performed?
No, LT1021DMH-7 has no trim pin-pin 5 is internally unconnected (NC). This architectural choice eliminates TC degradation from external trimming networks and delivers the best possible 3 ppm/°C temperature coefficient. Output adjustment must be done externally using potentiometric circuits, such as a 200 Ω series resistor with 14 kΩ parallel trimmer (per LT1021 AI03), ensuring minimal impact on TC. This distinguishes LT1021DMH-7 from LT1021-5 and LT1021-10 variants that include active trim pins.
Can LT1021DMH-7 operate in shunt (two-terminal) mode, and what is the minimum shunt current?
Yes, LT1021DMH-7 supports true two-terminal shunt operation with the input pin left open. Minimum shunt current is 0.7 mA (typical) and 1.0 mA (max) at 25°C, rising to 1.2 mA at –40°C. In this configuration, it functions as a precision 7 V zener with identical drift and noise specs as in series mode. Shunt-mode load regulation is 50–100 ppm/mA, making it suitable for low-power biasing of op-amp inputs or setting thresholds in comparator circuits where VIN is unavailable.
What is the recommended layout practice to minimize noise in LT1021DMH-7 circuits?
To minimize thermoelectric noise in LT1021DMH-7, shield the TO-5 metal can from ambient air movement using a small foam cup or sealed enclosure-this reduces 0.01–1 Hz noise by nearly 10×. Use Kelvin connections: route GND sense trace separately from power ground, and keep VOUT and GND traces short and wide. Place a 10 µF solid tantalum capacitor (with 2–5 Ω series resistance) directly at the output for optimal transient response. Avoid routing high-current or switching nodes near the LT1021DMH-7 package or its sense lines.
How does LT1021DMH-7 compare to LT1021BMH-7 in terms of temperature coefficient and stability?
LT1021DMH-7 specifies a maximum temperature coefficient of 3 ppm/°C (vs. 5 ppm/°C for LT1021BMH-7) and superior long-term stability of 7 ppm/1000 hrs (vs. 10 ppm for BMH grade). Both share identical pinout, package, and electrical architecture, but the "D" grade undergoes tighter post-package burn-in and screening to achieve enhanced TC and drift performance. The LT1021DMH-7 is selected for applications where reference-induced error must remain below 0.5 LSB in 12-bit systems over full industrial temperature range.
LT1021DMH-7 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):
- 7V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- ±0.71%
- 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-7 FAQ
1.How can I place an order for LT1021DMH-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1021DMH-7 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-7 reliable?
The price and inventory of LT1021DMH-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1021DMH-7 is usually 5 days.
3.What payment methods are accepted for LT1021DMH-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1021DMH-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1021DMH-7?
LT1021DMH-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1021DMH-7 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-7?
For technical support, including LT1021DMH-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1021DMH-7 requirements.
6.How does Aetrix verify that LT1021DMH-7 is sourced from the original manufacturer or authorized distributors?
All LT1021DMH-7 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-7 meets industry standards.
7.What is the process for return or replacement of LT1021DMH-7?
All LT1021DMH-7 units undergo pre-shipment inspection (PSI). If there is an issue with LT1021DMH-7, 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-7 part is unused and in its original packaging.
Return procedure for LT1021DMH-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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