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Analog Devices Inc. LM329CZ#PBF
- Part No.:
- LM329CZ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM329CZ#PBF.pdf
- Description:
- IC VREF SHUNT 6.9V TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:307
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Product details
Overview
LM329CZ#PBF from Analog Devices (formerly Linear Technology) is a precision 6.9V shunt voltage reference in a 3-lead TO-92 package, featuring guaranteed 30ppm/°C temperature coefficient, ≤2Ω dynamic impedance, and ≤100µV RMS wideband noise (10Hz–10kHz). It operates over 0°C to 70°C and supports 0.6mA–15mA reverse current, serving as a stable reference for high-accuracy analog signal chains.
For engineers reviewing the LM329CZ#PBF datasheet, LM329CZ#PBF pinout, LM329CZ#PBF application, or LM329CZ#PBF equivalent, key selection criteria include its buried Zener architecture for low surface noise, tight initial tolerance (±0.3% typical VZ), and compatibility with low-current, single-supply buffered reference designs.
Technical Context
The LM329CZ#PBF implements a high-gain shunt regulator around a buried Zener junction to achieve low dynamic impedance and suppress surface-related noise. Its temperature compensation network ensures stable 6.9V output across industrial ambient conditions without external components.
It functions exclusively as a two-terminal shunt reference: cathode connects to regulated voltage node, anode to ground or current sink. No enable, trim, or series-pass elements are integrated-operation requires only a series current-setting resistor and load decoupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 6.9V nominal (6.6V–7.25V min/max at 25°C, 0.6–15mA); sets precise bias point for ADCs, DACs, and transducer interfaces. |
| Tempco | 30ppm/°C max (LM329C grade); contributes ≤2.1mV drift over 0°C–70°C ambient range in unheated enclosures. |
| Dynamic Impedance | ≤2Ω max (1mA–15mA); maintains <1mV regulation error under 2mA load transients. |
| Noise (10Hz–10kHz) | ≤100µV RMS; avoids introducing measurable noise into 16-bit+ data acquisition front-ends. |
| Operating Current | 0.6mA–15mA reverse bias; enables use with high-value current-setting resistors (e.g., 47kΩ from 15V supply). |
| Long-Term Stability | 20ppm/kHr at 45°C; predicts <0.1% output shift over 5 years in continuous operation. |
Pinout & Package
LM329CZ#PBF uses a 3-lead TO-92 plastic package (Z package per LTC DWG #05-08-1410), with leads designated Anode (Pin 1), Cathode (Pin 2), and Case/Heat Sink (Pin 3). Pin 3 is internally connected to the cathode and must be grounded or tied to the same potential as Pin 2 for thermal stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current sink terminal | Connected to system ground or low-impedance return; carries full reverse bias current. |
| Pin 2 (Cathode) | Reference output node | Provides regulated 6.9V; must be decoupled locally (e.g., 1µF ceramic) to suppress noise and improve transient response. |
| Pin 3 (Case) | Thermal and electrical tie to cathode | Internally shorted to Pin 2; improves thermal dissipation and reduces thermal EMF errors when mounted to grounded metal chassis. |
Key Features
| Feature | Design Value |
|---|---|
| Buried Zener junction | Eliminates surface leakage and flicker noise, enabling 20µV low-frequency (0.1–10Hz) noise performance critical for precision weighing systems. |
| Guaranteed 30ppm/°C tempco (LM329C grade) | Ensures reference accuracy remains within ±0.021V over full operating temperature range without calibration. |
| ≤2Ω dynamic impedance | Supports stable regulation even with 100nF–1µF local capacitance, avoiding oscillation in buffered reference configurations. |
| 0.6mA minimum operating current | Allows ultra-low-power reference design using high-resistance current sources (e.g., 1MΩ from 12V supply = 12µA quiescent). |
Applications
| High-Accuracy Data Acquisition | Calibration Equipment |
|---|---|
|
Use Scenario: 16-bit SAR ADC front-end requiring sub-LSB reference stability over temperature and time. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 6.9V reference for ADC internal VREF input or external buffer amplifier. Use Value: 30ppm/°C tempco and 20ppm/kHr long-term drift ensure <0.5 LSB error contribution over 5-year field deployment at 25°C–60°C ambient. |
Use Scenario: Portable handheld calibrator generating traceable DC voltage outputs for field instrument verification. IC Role / Device Role / Timing Role: Primary reference source for programmable gain instrumentation amplifier stages generating 0–10V outputs. Use Value: Buried Zener construction delivers <100µV RMS noise, preventing measurement uncertainty in µV-range null detection circuits. |
| Industrial Sensor Signal Conditioning | Medical Instrumentation Reference |
|
Use Scenario: Bridge sensor interface in load cell amplifiers where excitation and reference share common path. IC Role / Device Role / Timing Role: Dual-role reference: supplies bridge excitation voltage and serves as ADC reference to reject common-mode supply variations. Use Value: Matched tempco between excitation and reference paths cancels thermal drift, improving effective resolution by ≥2 bits. |
Use Scenario: ECG front-end analog section requiring ultra-low-noise, stable reference for baseline correction and gain setting. IC Role / Device Role / Timing Role: Low-noise shunt reference feeding rail-to-rail op-amp bias networks and ADC reference inputs. Use Value: 7µV typical low-frequency noise (0.1–10Hz) prevents baseline wander artifacts in diagnostic-grade waveform capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1634BCS8-6.9#PBF | 6.9V, 0.05% initial accuracy, 10ppm/°C max tempco, SO-8 package, requires 60µA min current. | Higher accuracy and lower tempco, but requires PCB area for SO-8 and external bypass capacitor; not drop-in compatible. | Select when ±0.05% absolute accuracy and <10ppm/°C drift are mandatory; avoid if TO-92 footprint or ultra-low current (<0.6mA) is required. |
| TL431CDBZR | 2.5V adjustable shunt reference, 2% initial tolerance, 50ppm/°C tempco, SOT-23 package, 1mA min current. | Lower cost and smaller footprint, but fixed 2.5V output and higher tempco limit use to non-critical references. | Select for cost-sensitive, space-constrained applications where 2.5V suffices and ±1% reference error is acceptable. |
Compared with LT1634BCS8-6.9#PBF and TL431CDBZR, the LM329CZ#PBF offers optimal balance of TO-92 compatibility, 6.9V native output, and proven long-term stability-making it preferred for legacy-replacement and repair scenarios where board real estate and exact voltage match are constraints.
Availability
LM329CZ#PBF is available at Aetrix Electronics and suitable for high-accuracy data acquisition, calibration equipment, and industrial sensor signal conditioning requiring stable component supply and long-lifecycle support.
Supply support for LM329CZ#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 its precision analog portfolio, including voltage references, op-amps, and power management ICs, with emphasis on high-reliability industrial and medical applications.
The LM329CZ#PBF belongs to Linear's legacy precision shunt reference family, designed specifically for applications demanding low noise, low tempco, and long-term stability without trimming-targeting test equipment, instrumentation, and sensor interfaces.
FAQ
What is the maximum reverse current rating for LM329CZ#PBF?
The absolute maximum reverse-breakdown current for LM329CZ#PBF is 30mA per Absolute Maximum Ratings. However, the recommended operating range is 0.6mA to 15mA to maintain specified dynamic impedance, tempco, and noise performance. Exceeding 15mA may increase self-heating and degrade long-term stability without violating absolute limits.
Can LM329CZ#PBF be used in place of LM329BZ#PBF?
Yes, LM329CZ#PBF can replace LM329BZ#PBF in most designs, but with tighter tempco requirements: LM329CZ#PBF guarantees ≤30ppm/°C versus ≤15ppm/°C for LM329BZ#PBF. Both share identical 6.9V nominal output, TO-92 package, and 0.6–15mA operating current range. The C-grade offers higher tempco tolerance for cost-sensitive applications where ±0.021V drift over 0°C–70°C is acceptable.
Does LM329CZ#PBF require an external capacitor for stability?
No, LM329CZ#PBF does not require an external capacitor for basic stability-it is inherently stable as a shunt reference. However, a 1µF ceramic capacitor placed directly between cathode (Pin 2) and anode (Pin 1) is recommended to reduce high-frequency noise and improve transient response during load switching. Larger capacitors (>10µF) may cause instability due to phase margin degradation.
What is the purpose of Pin 3 (Case) on LM329CZ#PBF?
Pin 3 on LM329CZ#PBF is the metal case terminal, internally connected to the cathode (Pin 2). It provides a low-inductance thermal and electrical path to ground or chassis, reducing thermal EMF errors and improving heat dissipation. Leaving Pin 3 floating degrades long-term stability and increases low-frequency noise; it must be tied to the same potential as Pin 2 for specified performance.
How does the buried Zener structure in LM329CZ#PBF improve noise performance?
The buried Zener structure in LM329CZ#PBF places the Zener junction below the silicon surface, eliminating surface-state generation-recombination noise that dominates conventional Zeners. This yields ≤20µV RMS wideband noise (10Hz–10kHz) and ≤7µV low-frequency noise (0.1–10Hz), making LM329CZ#PBF suitable for precision applications like digital multimeters and strain gauge amplifiers where noise directly impacts measurement resolution.
LM329CZ#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, Buried Zener
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 6.9V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- -4.35%, +5.07%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 100µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM329CZ#PBF FAQ
1.How can I place an order for LM329CZ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LM329CZ#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 LM329CZ#PBF reliable?
The price and inventory of LM329CZ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM329CZ#PBF is usually 5 days.
3.What payment methods are accepted for LM329CZ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM329CZ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM329CZ#PBF?
LM329CZ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM329CZ#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 LM329CZ#PBF?
For technical support, including LM329CZ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM329CZ#PBF requirements.
6.How does Aetrix verify that LM329CZ#PBF is sourced from the original manufacturer or authorized distributors?
All LM329CZ#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 LM329CZ#PBF meets industry standards.
7.What is the process for return or replacement of LM329CZ#PBF?
All LM329CZ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LM329CZ#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 LM329CZ#PBF part is unused and in its original packaging.
Return procedure for LM329CZ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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