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Analog Devices Inc. LT1029CZ#PBF
- Part No.:
- LT1029CZ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LT1029CZ#PBF.pdf
- Description:
- IC VREF SHUNT 5V TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:641
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Product details
Overview
LT1029CZ#PBF from Analog Devices (formerly Linear Technology) is a 5V precision shunt voltage reference in TO-92 plastic package, featuring ±0.2% initial accuracy, 20ppm/°C max temperature drift, 0.6Ω dynamic impedance, and 700µA–10mA operating current range. It operates as either positive or negative reference in precision analog signal chains for data converters and regulators.
For engineers reviewing the LT1029CZ#PBF datasheet, LT1029CZ#PBF pinout, LT1029CZ#PBF application, or LT1029CZ#PBF equivalent, key selection criteria include shunt impedance stability under varying load current, trim-range impact on long-term drift, compatibility with LM136-5 layouts, and thermal performance in ambient-temperature-limited enclosures.
Technical Context
The LT1029CZ#PBF implements a bandgap-based shunt reference architecture optimized for Zener-mode operation, enabling bidirectional polarity use without external inversion circuitry. Its internal thin-film resistor network supports output trimming while maintaining drift integrity - trim adjustment does not degrade the 20ppm/°C max specification.
It delivers stable regulation across 700µA to 10mA cathode current, with reverse dynamic impedance as low as 0.6Ω at 1mA, ensuring minimal output variation during transient load shifts. The device is specified for 0°C to 70°C operation and rated for 15mA absolute maximum reverse current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00 V nominal, ±0.2% initial tolerance - enables direct replacement of LM136-5 in 5V reference designs without recalibration. |
| Temp Drift (Max) | 20 ppm/°C - ensures ≤1 mV output shift over 0°C–70°C industrial range, critical for 16-bit ADC biasing. |
| Dynamic Impedance | 0.6 Ω typical at 1mA - maintains <0.5 mV output deviation when cathode current varies by ±1 mA. |
| Operating Current | 700 µA to 10 mA - supports low-power sensor interfaces and high-current precision regulators without external buffering. |
| Trim Range | +5%, –13% - allows fine-tuning to exact system voltage targets (e.g., 5.120 V for 12-bit DAC full-scale), though large range requires careful TC management. |
| Long-Term Stability | 20 ppm/kHr - guarantees <0.02% output drift after 1000 hours of continuous operation, suitable for metrology-grade equipment. |
Pinout & Package
LT1029CZ#PBF uses the Z package: 3-lead TO-92 plastic case with standard pinout orientation (viewed from bottom). Package thermal resistance is θJA = 160°C/W, limiting power dissipation to ~312 mW at 70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Reference Ground / Cathode Return | Low-impedance return path for cathode current; must be connected directly to system ground plane to minimize noise coupling. |
| Pin 2 (Cathode) | 5V Output Terminal | Delivers regulated 5V when biased with external current source; polarity reversible for negative-reference configurations. |
| Pin 3 (ADJ) | Trim Input | Accepts external potentiometer or resistor network to adjust output voltage; internal design isolates trim path from drift-sensitive elements. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional polarity support | Operates as +5V shunt reference or –5V sink reference without external op-amps or level-shifters. |
| No minimum-temp-coeff network required | Meets 20ppm/°C drift spec without external compensation components - simplifies BOM and layout vs. LM336-5. |
| Stable with all shunt capacitance | Remains stable with 0–1µF bypass caps; avoids oscillation issues common in high-Z shunt references. |
| Wide trim range with drift isolation | ±13% trim capability without degrading temperature coefficient - enables factory calibration without sacrificing long-term stability. |
Applications
| A-to-D and D-to-A Converters | Precision Regulators |
|---|---|
Use Scenario: High-resolution 16-bit SAR ADC requiring stable 5V reference for full-scale accuracy. IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric excitation for ADC internal DAC and external sensor bridges. Use Value: 0.6Ω dynamic impedance ensures <0.3 LSB error under 1mA load transients, preserving ENOB in real-time acquisition. | Use Scenario: Low-noise LDO feedback divider where reference stability dominates output ripple rejection. IC Role / Device Role / Timing Role: Precision 5V shunt reference replacing zener diodes in adjustable regulator feedback networks. Use Value: ±0.2% initial tolerance eliminates need for post-assembly trimming; 20ppm/°C drift maintains ±0.5% output regulation over 0°C–70°C. |
| Precision Current Sources | V to F and F to V Converters |
Use Scenario: 4–20mA transmitter loop powered from 24V rail with microamp-level quiescent current budget. IC Role / Device Role / Timing Role: Stable 5V reference establishing precise IOUT = VREF/RSET in Howland current source topology. Use Value: 700µA minimum operating current allows operation down to 3.5V headroom, enabling ultra-low-dropout loop designs. | Use Scenario: Frequency-to-voltage converter in engine control unit measuring RPM via magnetic pickup sensor. IC Role / Device Role / Timing Role: Reference voltage defining scaling factor (VOUT = K × fIN) in integrator-based F/V transfer function. Use Value: Long-term stability of 20ppm/kHr prevents calibration drift between vehicle service intervals, maintaining speed measurement accuracy. |
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 | ±1% initial tolerance, 100ppm/°C max drift, no trim pin, higher 2Ω dynamic impedance | Suitable for cost-sensitive industrial controls where 16-bit accuracy is unnecessary | Lower-cost drop-in for non-critical references; requires layout review for thermal derating due to higher impedance |
| REF5050AIDGKR | ±0.05% initial tolerance, 3ppm/°C max drift, 0.1Ω impedance, 2.5mA min current, SO-8 package | Targeted at high-end instrumentation and calibration systems demanding sub-ppm stability | Superior performance but requires PCB redesign; not pin-compatible; higher supply current limits battery use |
Compared with LM136-5.0/NOPB, LT1029CZ#PBF offers 5× better accuracy and 5× lower drift at modest cost increase; versus REF5050AIDGKR, it trades ultimate precision for TO-92 form factor, lower min current, and proven field reliability in legacy designs.
Availability
LT1029CZ#PBF is available at Aetrix Electronics and suitable for precision data acquisition, industrial process control, and test equipment requiring stable component supply with guaranteed long-term availability and traceable lot history.
Supply support for LT1029CZ#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1029CZ#PBF belongs to ADI's legacy Linear Technology precision reference family, designed specifically for applications demanding robust shunt-mode operation, wide current range, and field-serviceable trim capability without drift penalty.
FAQ
What is the operating temperature range for LT1029CZ#PBF?
The LT1029CZ#PBF is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its C-suffix designation and supports deployment in office equipment, test fixtures, and non-military industrial controllers. Exceeding 70°C ambient risks exceeding the 100°C junction limit due to its 160°C/W thermal resistance in TO-92 packaging.
Can LT1029CZ#PBF be used as a negative voltage reference?
Yes, the LT1029CZ#PBF can be used as a negative voltage reference by reversing its connection: connect Pin 2 (Cathode) to system ground and Pin 1 (Anode) to the negative rail. Its shunt architecture enables bidirectional polarity without external circuitry, making it ideal for split-supply ±2.5V reference generation using matched resistors.
Does trimming the output voltage of LT1029CZ#PBF affect its temperature drift?
No - the LT1029CZ#PBF's trim architecture isolates the adjustment path from the core bandgap elements. As confirmed in the datasheet, output voltage trim does not affect drift performance, allowing calibration to exact values (e.g., 5.120 V) while retaining the specified 20ppm/°C max temperature coefficient.
What is the minimum operating current for LT1029CZ#PBF?
The LT1029CZ#PBF requires a minimum cathode current of 700µA to maintain regulation and specified accuracy. Below this threshold, output voltage deviates nonlinearly and dynamic impedance rises sharply. For low-power applications, ensure the bias network delivers ≥700µA even at lowest expected input voltage and temperature.
Is LT1029CZ#PBF pin-compatible with LM136-5?
Yes, the LT1029CZ#PBF is explicitly designed as a pin-compatible upgrade to the LM136-5 in TO-92 packages. Both share identical 3-pin TO-92 pinout (Anode–Cathode–ADJ), enabling direct replacement without PCB modification. However, the LT1029CZ#PBF adds a functional trim pin not present in standard LM136-5 variants.
LT1029CZ#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:
- ±1%
- Temperature Coefficient:
- 34ppm/°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
LT1029CZ#PBF FAQ
1.How can I place an order for LT1029CZ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1029CZ#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 LT1029CZ#PBF reliable?
The price and inventory of LT1029CZ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1029CZ#PBF is usually 5 days.
3.What payment methods are accepted for LT1029CZ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1029CZ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1029CZ#PBF?
LT1029CZ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1029CZ#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 LT1029CZ#PBF?
For technical support, including LT1029CZ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1029CZ#PBF requirements.
6.How does Aetrix verify that LT1029CZ#PBF is sourced from the original manufacturer or authorized distributors?
All LT1029CZ#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 LT1029CZ#PBF meets industry standards.
7.What is the process for return or replacement of LT1029CZ#PBF?
All LT1029CZ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1029CZ#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 LT1029CZ#PBF part is unused and in its original packaging.
Return procedure for LT1029CZ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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