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Analog Devices Inc. LT1029ACZ#PBF
- Part No.:
- LT1029ACZ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LT1029ACZ#PBF.pdf
- Description:
- IC VREF SHUNT 5V TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:278
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Product details
Overview
LT1029ACZ#PBF from Analog Devices (formerly Linear Technology) is a 5V precision shunt voltage reference in TO-92 plastic package, featuring ±0.2% initial output tolerance, 20ppm/°C max temperature drift, 0.6Ω dynamic impedance, and 700µA–10mA operating current range. It operates as either positive or negative reference and supports output trimming without degrading drift performance, ideal for high-accuracy data converter biasing.
For engineers reviewing the LT1029ACZ#PBF datasheet, LT1029ACZ#PBF pinout, LT1029ACZ#PBF application, or LT1029ACZ#PBF equivalent, key selection criteria include shunt impedance stability under varying load current, trim-range impact on long-term drift, compatibility with legacy LM136-5 circuits, and thermal derating in TO-92 at elevated ambient temperatures.
Technical Context
The LT1029ACZ#PBF implements a bandgap-based shunt reference architecture optimized for low dynamic impedance (0.2–0.6Ω typ) across its full 700µA–10mA operating current range, enabling stable regulation despite supply or load transients. Its three-terminal configuration (ADJ, +, –) allows bidirectional use-either sinking current from a positive rail or sourcing into a negative rail.
Unlike series references, it requires no input-to-output voltage headroom and achieves 3mV max temperature-induced output variation over 0°C to 70°C (LT1029AC grade), with trim capability offering ±3% nominal adjustment while preserving specified drift performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00 V ±0.2% (pre-trimmed accuracy enables direct use without calibration in mid-precision systems) |
| Temp Drift (max) | 20 ppm/°C (ensures ≤±1.4 mV error over 0°C to 70°C ambient range) |
| Dynamic Impedance | 0.6 Ω (minimizes output voltage shift during 1mA load steps, critical for ADC reference stability) |
| Operating Current | 700 µA to 10 mA (supports low-power sensor interfaces and high-current DAC buffers) |
| Trim Range | ±3% nominal (allows fine-tuning to exact 5.120V or other system-specific values without drift penalty) |
| Long-Term Stability | 20 ppm/kHr (predicts <±0.1% output shift after 5 years of continuous operation) |
Pinout & Package
LT1029ACZ#PBF uses the Z package: 3-lead TO-92 plastic case with standard lead spacing (0.100" pitch), rated for 0°C to 70°C operation and 100°C junction max. Package dimensions conform to LTC DWG #05-08-1330.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ADJ) | Trim terminal | Connects to external potentiometer wiper for ±3% output adjustment; internal thin-film resistors ensure trim does not degrade temperature coefficient |
| Pin 2 (+) | Anode / Output | Reference output node; sinks current when used as positive reference, sources current when used as negative reference |
| Pin 3 (–) | Cathode / Ground | Return path for reference current; tied to system ground in positive mode, to negative rail in negative mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional reference operation | Supports both positive-shunt (e.g., +5V rail) and negative-shunt (e.g., –5V rail) configurations without external polarity reversal components |
| No minimum temperature coefficient network required | Eliminates discrete TC-matching diodes and resistors needed by LM136-5, reducing BOM count and layout area |
| Stable with all shunt capacitance values | Operates reliably with 1µF solid tantalum bypass or >0.01µF ceramic; avoids instability seen in older shunt references at mid-range caps (300pF–10nF) |
| Low-drift trim capability | Output adjustment via ADJ pin preserves 20ppm/°C max drift specification-unlike competing references where trimming increases TC |
Applications
| High-Resolution ADC Biasing | Precision Current Source Reference |
|---|---|
Use Scenario: Providing stable 5.000V reference to 16-bit SAR ADCs in industrial data acquisition modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing absolute scale for analog-to-digital conversion. Use Value: 0.6Ω dynamic impedance limits code-dependent reference droop to <1 LSB across full-scale transitions. | Use Scenario: Setting precise 100µA bias current for photodiode transimpedance amplifiers in optical sensing. IC Role / Device Role / Timing Role: Stable voltage source feeding known resistor to generate metrology-grade current. Use Value: ±0.2% initial tolerance and 20ppm/°C drift ensure current accuracy remains within ±0.3% over 0°C–70°C. |
| Split ±2.5V Rail Generation | Voltage-to-Frequency Converter Reference |
Use Scenario: Creating matched ±2.5V rails from single 5V supply using dual op-amps and LT1029ACZ#PBF as center-point reference. IC Role / Device Role / Timing Role: Precision midpoint reference enabling symmetric rail splitting with <0.5% imbalance. Use Value: Low 0.6Ω impedance prevents loading-induced offset in resistor-divider networks driving op-amp inputs. | Use Scenario: Supplying reference voltage to LM331-based V/F converters in isolated analog signal transmission. IC Role / Device Role / Timing Role: Defining linear transfer function slope (Hz/V) in analog front-end signal conditioning. Use Value: 20ppm/°C drift ensures frequency accuracy stays within ±0.01% over temperature-critical for calibrated sensor outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM136-5.0/NOPB | Higher 100ppm/°C max drift; requires external TC-matching network for low-drift operation | Lacks integrated trim capability; less suitable for systems requiring field calibration or tight production binning | Lower-cost option where ±1% total error budget accommodates higher drift and no trimming |
| REF5050AIDR | Series topology; 5V output, 3ppm/°C max drift, 10mA max load; requires ≥6.5V input | Not shunt-compatible; cannot replace LT1029ACZ#PBF without circuit redesign (e.g., added pass transistor) | Preferred when ultra-low drift and high PSRR are mandatory, and input headroom is available |
Compared with LM136-5.0/NOPB and REF5050AIDR, the LT1029ACZ#PBF uniquely delivers sub-0.3% total error over temperature in a pin-compatible shunt form factor-enabling drop-in upgrades in legacy designs while avoiding series-reference headroom constraints.
Availability
LT1029ACZ#PBF is available at Aetrix Electronics and suitable for precision data acquisition, industrial sensor signal conditioning, and metrology-grade current source design requiring stable component supply across extended production lifecycles.
Supply support for LT1029ACZ#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 and maintains full technical and manufacturing continuity for legacy Linear products including the LT1029 family.
The LT1029 product line was designed specifically for high-stability shunt reference applications where low dynamic impedance, wide operating current range, and bidirectional functionality are essential-targeting precision instrumentation, test equipment, and calibration-critical embedded systems.
FAQ
What is the maximum operating temperature for LT1029ACZ#PBF?
The LT1029ACZ#PBF is rated for operation from 0°C to 70°C ambient temperature, with a maximum junction temperature of 100°C. Its TO-92 package has a thermal resistance θJA of 160°C/W, so power dissipation must be limited to ≤625mW to stay within safe thermal limits at 70°C ambient. Derating curves in the official datasheet define allowable current vs. temperature.
Can LT1029ACZ#PBF be used as a negative voltage reference?
Yes, the LT1029ACZ#PBF can be used as a negative reference by connecting Pin 2 (+) to the negative rail and Pin 3 (–) to system ground, allowing it to source current into the negative supply. This bidirectional capability eliminates need for polarity-reversal circuitry and is explicitly supported in Linear's application notes AI04 and TA01.
Does trimming the output voltage of LT1029ACZ#PBF affect its temperature drift?
No-trimming the output voltage of LT1029ACZ#PBF via the ADJ pin does not degrade its temperature drift specification. The internal thin-film resistor network is designed so that adjustment preserves the 20ppm/°C max drift rating, unlike earlier references where trimming increased TC. This is confirmed in the "Output Trimming" section of the datasheet.
Is LT1029ACZ#PBF pin-compatible with LM136-5?
Yes, LT1029ACZ#PBF is pin-compatible with LM136-5 in the TO-92 package, sharing identical pinout (ADJ, +, –) and mechanical footprint. It serves as a direct functional upgrade-replacing LM136-5 without PCB changes while improving initial accuracy from ±1% to ±0.2% and reducing max drift from 100ppm/°C to 20ppm/°C.
What bypass capacitor value is recommended for LT1029ACZ#PBF?
A 1µF solid tantalum capacitor is recommended for bypassing LT1029ACZ#PBF in most applications. Values between 300pF and 0.01µF are discouraged due to longer settling times after current transients; larger ceramics (>0.01µF) or tantalum provide stable regulation and fast transient response per the TPC01 and AI01 characterization data.
LT1029ACZ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bag
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 700 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LT1029ACZ#PBF FAQ
1.How can I place an order for LT1029ACZ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1029ACZ#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 LT1029ACZ#PBF reliable?
The price and inventory of LT1029ACZ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1029ACZ#PBF is usually 5 days.
3.What payment methods are accepted for LT1029ACZ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1029ACZ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1029ACZ#PBF?
LT1029ACZ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1029ACZ#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 LT1029ACZ#PBF?
For technical support, including LT1029ACZ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1029ACZ#PBF requirements.
6.How does Aetrix verify that LT1029ACZ#PBF is sourced from the original manufacturer or authorized distributors?
All LT1029ACZ#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 LT1029ACZ#PBF meets industry standards.
7.What is the process for return or replacement of LT1029ACZ#PBF?
All LT1029ACZ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1029ACZ#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 LT1029ACZ#PBF part is unused and in its original packaging.
Return procedure for LT1029ACZ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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