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Analog Devices Inc. LM329BZ#PBF
- Part No.:
- LM329BZ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM329BZ#PBF.pdf
- Description:
- IC VREF SHUNT 6.9V TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,256
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Product details
Overview
LM329BZ#PBF from Analog Devices (formerly Linear Technology) is a precision 6.9V shunt voltage reference in a 3-lead TO-92 package, featuring 15ppm/°C max temperature coefficient, ≤1Ω dynamic impedance at 1mA, ≤20µV RMS wideband noise (10Hz–10kHz), 0.6–15mA operating current range, and buried Zener architecture for low surface noise. It serves as a stable reference in high-accuracy analog signal chains.
For engineers reviewing the LM329BZ#PBF datasheet, LM329BZ#PBF pinout, LM329BZ#PBF application, or LM329BZ#PBF equivalent, key selection criteria include guaranteed temperature coefficient grade (B), TO-92 thermal resistance (θJA = 160°C/W), reverse-breakdown voltage tolerance (6.6–7.25V), long-term stability (20ppm/kHr), and compatibility with low-current buffered reference designs.
Technical Context
The LM329BZ#PBF implements a high-gain shunt regulator around a buried Zener junction to achieve low dynamic impedance and suppress surface-related noise. Its internal topology includes active current regulation and thermal compensation circuitry optimized for operation across 0°C to 70°C ambient.
It operates strictly as a two-terminal shunt reference: cathode and anode pins define reverse-bias conduction path, while the third lead (case/substrate) is internally connected to the anode and serves as mechanical ground reference. No internal series pass element or output buffer is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 6.9V nominal, 6.6–7.25V min/max over 0.6–15mA - defines absolute accuracy window for calibration-grade systems |
| Tempco (Grade B) | ≤15ppm/°C - enables ≤1.05mV drift over 0°C–70°C ambient, critical for metrology-grade references |
| Dynamic Impedance | ≤1Ω at 1mA - ensures minimal load-induced voltage shift during transient current demand |
| Wideband Noise | ≤20µV RMS (10Hz–10kHz) - supports high-resolution ADC/DAC biasing without added filtering |
| Operating Current | 0.6–15mA - allows use with high-value ballast resistors in low-power sensor interfaces |
| Long-Term Stability | 20ppm/kHr at 45°C - quantifies aging-induced drift for systems requiring multi-year calibration integrity |
Pinout & Package
LM329BZ#PBF uses a 3-lead plastic TO-92 (Z package) with anode-connected case. Pin 1 is cathode, Pin 2 is anode, Pin 3 is case/substrate (internally tied to anode). Thermal resistance θJA = 160°C/W enables operation up to 150°C junction temperature with appropriate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | High-impedance reference output node | Connected to regulated 6.9V node; requires external ballast resistor to supply operating current |
| Pin 2 (Anode) | Current return path and reference ground | Internally bonded to substrate; must be held at system ground potential for accurate regulation |
| Pin 3 (Case) | Electrically tied to anode | Provides mechanical mounting and thermal path; electrically redundant but must be grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Buried Zener structure | Eliminates surface leakage and flicker noise, enabling 20µV RMS noise performance without external filtering |
| Guaranteed 15ppm/°C tempco (Grade B) | Ensures predictable, bounded drift across full industrial temperature range without trimming |
| 1Ω max dynamic impedance | Maintains voltage regulation within ±1mV under 1mA load transients, supporting fast-settling reference buffers |
| 0.6–15mA operating range | Permits design flexibility: low-current mode extends battery life; high-current mode improves PSRR in noisy supplies |
Applications
| Calibration Standards | A/D and D/A Converters |
|---|---|
Use Scenario: Portable handheld calibrators requiring traceable voltage outputs over extended field deployment. IC Role / Device Role / Timing Role: Primary 6.9V reference source for DAC output scaling and ADC input full-scale definition. Use Value: 20ppm/kHr long-term stability ensures calibration validity between annual lab recalibrations. |
Use Scenario: 16-bit SAR ADC front-end in data acquisition modules powered from unregulated 9–40V supplies. IC Role / Device Role / Timing Role: Shunt reference establishing precise VREF for ADC conversion accuracy. Use Value: ≤1Ω dynamic impedance prevents code-dependent errors during fast sampling transitions. |
| Instrumentation Reference | Transducer Signal Conditioning |
Use Scenario: Benchtop multimeters needing sub-10ppm linearity and low-noise reference for autoranging circuits. IC Role / Device Role / Timing Role: Buffered reference generator feeding precision op-amp gain stages and offset nulling networks. Use Value: 20µV RMS noise avoids limiting effective resolution below 18 bits in DC-coupled measurement paths. |
Use Scenario: Strain gauge Wheatstone bridge excitation in industrial load cells with 4–20mA loop power constraints. IC Role / Device Role / Timing Role: Stable excitation reference for ratiometric bridge-to-ADC conversion. Use Value: 15ppm/°C tempco matches typical strain gauge TCR, minimizing thermal error coupling. |
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, SO-8 package, 1.2–20mA operating range | Higher initial accuracy and lower tempco, but requires PCB real estate for SO-8 and external bypass cap | Select when tighter initial tolerance (<±3.5mV) and lower thermal drift dominate over TO-92 form factor |
| TL431CDBZR | 2.5V adjustable reference, 2% initial tolerance, 50ppm/°C, SOT-23, 1–100mA range | Lower voltage, higher tempco, wider current range; requires external resistor divider for 6.9V output | Select for cost-sensitive, non-calibration applications where ±50mV reference error is acceptable |
Compared with LT1634BCS8-6.9#PBF and TL431CDBZR, the LM329BZ#PBF delivers superior thermal stability in a through-hole TO-92 package ideal for legacy instrumentation layouts, while avoiding the accuracy trade-offs of adjustable shunt references or the board space penalty of surface-mount alternatives.
Availability
LM329BZ#PBF is available at Aetrix Electronics and suitable for calibration standards, A/D and D/A converters, and instrumentation reference applications requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM329BZ#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, amplifiers, and power management ICs, with focus on high-reliability industrial and test equipment markets.
The LM329BZ#PBF belongs to Linear Technology's legacy precision shunt reference family, designed specifically for metrology-grade applications demanding low noise, tight tempco, and proven long-term stability in compact through-hole packages.
FAQ
What is the maximum reverse breakdown voltage tolerance for LM329BZ#PBF at 25°C?
The LM329BZ#PBF has a reverse-breakdown voltage range of 6.6V to 7.25V at 25°C with 0.6–15mA operating current. This 650mV total span reflects Grade B specification and is verified per the official Linear Technology datasheet revision D. The nominal 6.9V point falls near the center of this band, ensuring predictable behavior in trimmed reference designs using the LM329BZ#PBF.
Can LM329BZ#PBF operate with less than 0.6mA of cathode current?
No - the LM329BZ#PBF is not specified to regulate below 0.6mA cathode current. Below this threshold, reverse breakdown becomes unstable and voltage deviation exceeds specifications. The datasheet explicitly defines 0.6mA as the minimum operating current, and attempting operation at lower currents risks loss of regulation and increased noise in the LM329BZ#PBF.
Is the case (Pin 3) of LM329BZ#PBF electrically isolated?
No - Pin 3 (case) of the LM329BZ#PBF is internally connected to the anode (Pin 2) and is not isolated. It must be tied to system ground to maintain proper reference potential and thermal dissipation. Floating or biasing the case introduces regulation error and violates the LM329BZ#PBF's specified operating conditions.
How does the buried Zener construction improve LM329BZ#PBF noise performance?
The buried Zener in the LM329BZ#PBF places the depletion region below the silicon surface, eliminating interface-state noise and surface leakage currents that dominate conventional Zener noise. This results in ≤20µV RMS wideband noise (10Hz–10kHz), a measurable improvement confirmed in the LM329BZ#PBF's typical performance curves and critical for high-resolution data conversion systems.
What is the thermal resistance (θJA) of LM329BZ#PBF in TO-92 package?
The LM329BZ#PBF in 3-lead TO-92 (Z package) has a junction-to-ambient thermal resistance (θJA) of 160°C/W, as documented in the Linear Technology package drawing #05-08-1410. This value assumes standard JEDEC test conditions and guides heatsinking requirements - for example, at 15mA operating current and 6.9V drop, power dissipation is ~104mW, yielding ~16.6°C rise above ambient in still air.
LM329BZ#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:
- 20ppm/°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
LM329BZ#PBF FAQ
1.How can I place an order for LM329BZ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LM329BZ#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 LM329BZ#PBF reliable?
The price and inventory of LM329BZ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM329BZ#PBF is usually 5 days.
3.What payment methods are accepted for LM329BZ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM329BZ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM329BZ#PBF?
LM329BZ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM329BZ#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 LM329BZ#PBF?
For technical support, including LM329BZ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM329BZ#PBF requirements.
6.How does Aetrix verify that LM329BZ#PBF is sourced from the original manufacturer or authorized distributors?
All LM329BZ#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 LM329BZ#PBF meets industry standards.
7.What is the process for return or replacement of LM329BZ#PBF?
All LM329BZ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LM329BZ#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 LM329BZ#PBF part is unused and in its original packaging.
Return procedure for LM329BZ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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