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Analog Devices Inc. LT1021CCH-5#PBF
- Part No.:
- LT1021CCH-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
LT1021CCH-5#PBF.pdf
- Description:
- IC VREF PRECISION 5V TO-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,346
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Product details
Overview
LT1021CCH-5#PBF from Analog Devices (formerly Linear Technology) is a precision 5V buried-zener voltage reference IC with ultralow temperature drift (≤3 ppm/°C), low noise (3.0 µVP-P, 0.1–10 Hz), and ±0.005% initial output accuracy. It operates in series or shunt mode, sources/sinks up to 10 mA, and delivers stable reference voltage for high-resolution data converters and metrology-grade instrumentation.
For engineers reviewing the LT1021CCH-5#PBF datasheet, LT1021CCH-5#PBF pinout, LT1021CCH-5#PBF application, or LT1021CCH-5#PBF equivalent, key selection criteria include its 5 ppm/°C max slope drift specification, 100% noise-tested qualification, trimmable output, >100 dB ripple rejection, and compatibility with precision DAC/ADC full-scale calibration circuits requiring long-term stability.
Technical Context
The LT1021CCH-5#PBF uses a subsurface zener diode structure-eliminating surface-breakdown noise and hysteresis-to achieve superior temperature stability and time drift versus bandgap references. Its architecture enables both sourcing and sinking operation without external components, supporting dual-mode use in series-regulated supplies or two-terminal shunt configurations.
Unlike the LT1021-7, the LT1021CCH-5#PBF includes a dedicated TRIM pin (attenuation ratio 13:1) allowing ±70 mV adjustment while minimizing TC shift; input impedance at TRIM is ~100 kΩ. The device maintains <20 ppm/mA load regulation (sourcing) and <100 ppm/mA (sinking) across –10 to +10 mA output current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V ±2.5 mV (initial accuracy ≤±0.05% at 25°C) |
| Temp Coefficient | ≤3 ppm/°C (max slope over 0°C to 70°C commercial range) |
| Noise (0.1–10 Hz) | 3.0 µVP-P (enables sub-LSB stability in 16-bit+ systems) |
| Line Regulation | 2–4 ppm/V (7.2–40 V input range; critical for unregulated supply rails) |
| Load Regulation | 10–60 ppm/mA (sourcing/sinking asymmetry affects error budget in bidirectional loads) |
| Ripple Rejection | >100 dB at 150 Hz (rejects switching regulator noise without external filtering) |
| Supply Current | 0.8–1.2 mA (low quiescent draw supports battery-powered precision instruments) |
Pinout & Package
LT1021CCH-5#PBF is housed in an 8-lead TO-5 metal can (H package) with hermetic sealing and kovar leads optimized for low thermal EMF. Pin 1 is NC (internally connected, no external connection); Pin 2 = VIN; Pin 3 = NC; Pin 4 = GND; Pin 5 = TRIM; Pin 6 = NC; Pin 7 = VOUT; Pin 8 = NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 2 (VIN) | Input supply terminal | Accepts 7.2–40 V; requires ≥1 V differential above VOUT for regulation |
| Pin 4 (GND) | Reference ground | Carries only ~1 mA bias current; suitable as Kelvin sense point in precision layouts |
| Pin 5 (TRIM) | Voltage adjustment node | 100 kΩ input impedance; 13:1 attenuation enables precise full-scale DAC trimming |
| Pin 7 (VOUT) | Regulated output | Sources/sinks up to 10 mA; low-impedance output supports direct DAC reference connection |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow drift architecture | Buried zener eliminates surface-hysteresis; achieves 3 ppm/°C max slope without on-chip heaters |
| 100% noise screening | Guarantees ≤3.0 µVP-P (0.1–10 Hz) - critical for metrology-grade DVMs and strain gauge bridges |
| Dual-mode operation | Functions as 3-terminal series regulator or 2-terminal shunt (with VIN open) - simplifies board design reuse |
| High PSRR | >100 dB ripple rejection at 150 Hz enables direct use after switchers without LC filters |
| Trim-compatible accuracy | TRIM pin allows ±70 mV adjustment while limiting TC degradation to <1 ppm/°C for calibrated systems |
Applications
| High-Resolution Data Acquisition | Precision Digital Voltmeters |
|---|---|
Use Scenario: 16-bit SAR ADC front-end in automated test equipment requiring <0.5 LSB total error over 0°C–70°C. IC Role / Device Role / Timing Role: Primary voltage reference establishing full-scale range; referenced by ADC internal DAC and external gain stages. Use Value: 3 ppm/°C drift contributes <0.3 LSB error over 70°C span - meets 16-bit (±0.5 LSB) system accuracy target without recalibration. | Use Scenario: Portable handheld DVM with 7½-digit resolution and battery operation. IC Role / Device Role / Timing Role: Stable 5V reference for dual-slope integrator and auto-zero amplifier chains. Use Value: 3.0 µVP-P low-frequency noise ensures <1 µV RMS noise floor - enables true 7½-digit resolution under quiet lab conditions. |
| Inertial Navigation Systems | Precision Scales & Load Cells |
Use Scenario: Gyro/accelerometer signal conditioning in aerospace IMUs operating across –40°C to 85°C. IC Role / Device Role / Timing Role: Reference for sigma-delta ADCs digitizing MEMS sensor outputs; feeds analog front-end gain blocks. Use Value: Long-term stability of 15 ppm (1000 hrs) minimizes calibration drift between flight cycles - reduces maintenance interval by 3× vs. bandgap references. | Use Scenario: Legal-for-trade industrial scale using 350 Ω Wheatstone bridge with 24-bit ΣΔ ADC. IC Role / Device Role / Timing Role: Excitation reference for bridge and reference for ADC - matched TC reduces ratiometric errors. Use Value: Temperature hysteresis of 10 ppm enables repeatability to ±0.001% FS after thermal cycling - satisfies OIML R76 Class III requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5050AIDR | 5V bandgap reference; 3 ppm/°C max drift; higher 5.5 µVP-P noise; 1.9 mA supply current | Lower cost; less suitable for sub-16-bit noise-sensitive metrology | Choose for cost-constrained industrial sensors where 5 µV noise is acceptable |
| ADR445BRZ | 5V XFET reference; 3 ppm/°C max drift; 2.7 µVP-P noise; 1.2 mA supply current; no TRIM pin | Lacks trim capability; better noise but no field calibration option | Choose when absolute lowest noise is prioritized and factory-trimmed accuracy suffices |
Compared with REF5050AIDR and ADR445BRZ, the LT1021CCH-5#PBF uniquely combines trimmability, buried-zener stability, and guaranteed low-noise screening - making it optimal for field-calibratable instrumentation where post-assembly full-scale adjustment is required.
Availability
LT1021CCH-5#PBF is available at Aetrix Electronics and suitable for high-precision data acquisition, portable metrology instruments, and aerospace-grade inertial measurement units requiring stable component supply with traceable lot history and extended lifecycle support.
Supply support for LT1021CCH-5#PBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1021 family was designed specifically for metrology-grade voltage reference applications demanding ultralow drift, low noise, and long-term stability - targeting 16-bit+ data converters, precision regulators, and calibration standards.
FAQ
What is the maximum input voltage rating for LT1021CCH-5#PBF?
The LT1021CCH-5#PBF has an absolute maximum input voltage of 40 V. Operation above this level risks permanent damage. For reliable long-term performance, maintain VIN ≤ 35 V to stay within the specified 35 V input/output differential limit, especially at elevated temperatures where thermal stress increases.
Does LT1021CCH-5#PBF support shunt-mode operation like a two-terminal zener?
Yes, the LT1021CCH-5#PBF supports true shunt-mode operation: with VIN left open, it regulates VOUT to 5 V while sinking 0.7–1.2 mA. This enables direct replacement of discrete zeners in legacy designs, retaining the same precision characteristics - including 3 ppm/°C drift and 3.0 µVP-P noise - without circuit redesign.
Can the TRIM pin of LT1021CCH-5#PBF be used to adjust output voltage in-circuit?
Yes, the TRIM pin of LT1021CCH-5#PBF accepts external voltage (0–5 V) with 100 kΩ input impedance and 13:1 attenuation, enabling ±70 mV output adjustment. To preserve temperature coefficient, drive the pin from a low-TC source (e.g., resistor divider from VOUT) - as shown in Figure AI02 of the LT1021 datasheet.
What is the thermal resistance (θJA) of the LT1021CCH-5#PBF H-package?
The LT1021CCH-5#PBF in the 8-lead TO-5 metal can (H package) has a junction-to-ambient thermal resistance (θJA) of 150°C/W. This value assumes standard PCB mounting with minimal copper; adding thermal vias or a heatsink pad can reduce effective θJA by up to 30%, critical for maintaining <3 ppm/°C drift in high-power-density layouts.
Is LT1021CCH-5#PBF qualified for automotive or military temperature ranges?
No, the LT1021CCH-5#PBF is rated for the commercial temperature range (0°C to 70°C) only. For extended ranges, select LT1021CMH-5 (–40°C to 85°C, industrial) or LT1021DMH-5 (–55°C to 125°C, military). The "C" grade suffix explicitly denotes commercial-grade qualification per the ordering matrix in the LT1021 datasheet.
LT1021CCH-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- TO-205-8, TO-5-8 Metal Can
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Series, Buried Zener
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3µVp-p
- Noise - 10Hz to 10kHz:
- 2.2µVrms
- Voltage - Input:
- 7.2V ~ 40V
- Current - Supply:
- 1.5mA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-5
LT1021CCH-5#PBF FAQ
1.How can I place an order for LT1021CCH-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1021CCH-5#PBF 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 LT1021CCH-5#PBF reliable?
The price and inventory of LT1021CCH-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1021CCH-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1021CCH-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1021CCH-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1021CCH-5#PBF?
LT1021CCH-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1021CCH-5#PBF 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 LT1021CCH-5#PBF?
For technical support, including LT1021CCH-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1021CCH-5#PBF requirements.
6.How does Aetrix verify that LT1021CCH-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1021CCH-5#PBF 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 LT1021CCH-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1021CCH-5#PBF?
All LT1021CCH-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1021CCH-5#PBF, 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 LT1021CCH-5#PBF part is unused and in its original packaging.
Return procedure for LT1021CCH-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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