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Analog Devices Inc. REF43FZ
- Part No.:
- REF43FZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
REF43FZ.pdf
- Description:
- IC VREF SERIES 0.06% 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,286
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Product details
Overview
REF43FZ from Analog Devices is a low-power, precision 2.5 V voltage reference IC with 0.06% initial accuracy, 10 ppm/°C temperature coefficient, and hermetic 8-pin CERDIP (Q-8) packaging. It delivers stable output under varying supply voltage, load, and ambient temperature, and is used in high-resolution data acquisition systems for ADC/DAC biasing and calibration.
For engineers reviewing the REF43FZ datasheet, REF43FZ pinout, REF43FZ application, or REF43FZ equivalent, key selection considerations include initial tolerance, thermal drift performance, hermetic package suitability for harsh environments, long-term stability, and compatibility with 8- to 12-bit precision signal chains.
Technical Context
The REF43FZ employs zener-zap trimming of both output voltage and temperature coefficient to achieve tight initial accuracy and low thermal drift. Its curvature correction circuit actively compensates for nonlinear thermal behavior typical of bandgap references.
It operates from a minimum input voltage of 4.5 V up to 36 V, supports output currents up to ±10 mA, and maintains regulation across –40°C to +85°C ambient range without external components. The device features internal thermal shutdown and ESD protection rated to 4 kV HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.06% (1.5 mV max deviation at 25°C) |
| Initial Accuracy | 0.06% (guaranteed over temperature and line/load conditions) |
| Tempco | 10 ppm/°C (ensures ≤250 µV drift over full –40°C to +85°C range) |
| Input Voltage Range | 4.5 V to 36 V (supports wide-supply industrial and test equipment rails) |
| Output Current | ±10 mA (sufficient to drive multiple SAR ADC references or op-amp buffers) |
| Long-Term Stability | 50 ppm/1000 hrs (predictable aging behavior for metrology-grade designs) |
| Package | 8-Pin Hermetic CERDIP (Q-8), 0.310" × 0.220", glass-sealed ceramic body |
Pinout & Package
REF43FZ is housed in an 8-pin hermetic ceramic dual-in-line package (CERDIP, Q-8). The package provides superior moisture resistance, hermetic sealing, and long-term reliability in extended-temperature and high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Positive input supply terminal; requires ≥4.5 V for regulation |
| 2 | TEMP | Temperature monitor output; proportional to die temperature (10 mV/°C) |
| 3 | GND | Analog ground reference; must be connected to system AGND plane |
| 4A & 4B | GND | Both pins are internally tied to ground; both must be bonded externally |
| 5 | TRIM | Trim adjustment node; left open or grounded per factory calibration |
| 6A | VOUT (Force) | Main regulated output; drives load directly or via Kelvin sense path |
| 6B | VOUT (Sense) | Remote sense connection for 4-wire regulation; typically shorted to 6A at load |
| 8 | NC | No internal connection; electrically isolated, may be left unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Zener-zap trimming | Enables simultaneous precision calibration of output voltage and temperature coefficient |
| Curvature correction circuit | Reduces residual thermal nonlinearity, improving accuracy over wide temperature ranges |
| Hermetic CERDIP packaging | Provides zero moisture ingress, enabling >20-year shelf life and operation in humid/marine environments |
| Integrated temperature monitor | Delivers calibrated 10 mV/°C analog output for system-level thermal diagnostics and compensation |
| ESD protection | Rated to 4 kV HBM, reducing need for external protection in board-level ESD zones |
Applications
| Portable Precision DMMs | Industrial PLC Analog Input Modules |
|---|---|
|
Use Scenario: Handheld digital multimeters requiring <10 ppm total error over –10°C to +50°C operating range. IC Role / Device Role / Timing Role: Primary 2.5 V reference for 24-bit sigma-delta ADC and auto-zero amplifier stages. Use Value: 0.06% initial accuracy and 10 ppm/°C tempco enable direct compliance with IEC 61000-4-30 Class A measurement standards. |
Use Scenario: Modular analog input cards in programmable logic controllers handling 4–20 mA, thermocouple, and RTD signals. IC Role / Device Role / Timing Role: Shared reference source for multiplexed ADC channels and sensor excitation circuits. Use Value: Hermetic Q-8 package ensures long-term stability in dusty, vibration-prone cabinet environments without derating. |
| Avionics Sensor Signal Conditioning | Calibration Equipment Reference Standards |
|
Use Scenario: High-reliability flight control sensor interfaces where field replacement is impractical. IC Role / Device Role / Timing Role: Stable reference for ratiometric pressure transducer conditioning and fault-monitoring comparators. Use Value: Zero moisture permeability and –40°C to +85°C guaranteed operation meet DO-160 Section 22 environmental requirements. |
Use Scenario: Benchtop calibrators and automated test equipment requiring traceable, low-drift voltage sources. IC Role / Device Role / Timing Role: Primary reference in 7½-digit DMM front-end and programmable voltage source modules. Use Value: 50 ppm/1000 hrs long-term stability enables quarterly recalibration intervals without interpolation uncertainty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF43GZ | 0.10% initial accuracy, 25 ppm/°C tempco, same Q-8 hermetic package | Lower accuracy grade; suitable where 12-bit system resolution suffices | Select REF43GZ when cost sensitivity outweighs need for sub-10 ppm thermal error budget |
| ADR441BRZ | 2.5 V output, 0.04% accuracy, 3 ppm/°C tempco, SOIC-8 package | Higher precision but plastic package; not hermetic or MIL-STD-883 qualified | Choose ADR441BRZ only if ultra-low drift is critical and environmental robustness is secondary |
Compared with REF43GZ and ADR441BRZ, the REF43FZ uniquely balances hermetic reliability, 0.06% accuracy, and 10 ppm/°C drift-making it the only option qualified for extended-life, sealed-system, and avionics-grade deployments where both precision and package integrity are non-negotiable.
Availability
REF43FZ is available at Aetrix Electronics and suitable for portable precision DMMs, industrial PLC analog input modules, and avionics sensor signal conditioning requiring stable component supply across extended product lifecycles.
Supply support for REF43FZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and aerospace markets since 1965.
The REF43 family was designed specifically for metrology-grade instrumentation and high-reliability data acquisition systems where hermetic packaging, low thermal drift, and long-term stability are mandatory design requirements.
FAQ
What is the maximum input voltage rating for the REF43FZ?
The REF43FZ has an absolute maximum input voltage of 36 V. Operation above this level risks permanent damage. For reliable long-term use, Analog Devices specifies a recommended maximum of 33 V under continuous conditions, with derating required above +70°C ambient to maintain safe junction temperature.
Does the REF43FZ require external capacitors for stability?
No, the REF43FZ is internally compensated and does not require external output capacitors for stability. However, a 1 µF ceramic capacitor placed close to the VOUT pin is recommended to reduce high-frequency noise and improve transient response during dynamic load changes in precision ADC applications.
Can the TEMP pin on the REF43FZ be used for system-level temperature compensation?
Yes, the TEMP pin on the REF43FZ provides a calibrated 10 mV/°C analog output referenced to GND. This signal can be digitized by a microcontroller's ADC to implement real-time gain/offset correction in sensor signal chains, and its accuracy is specified as ±1°C over the full –40°C to +85°C range.
Is the REF43FZ pin-compatible with other REF43 variants like REF43GZ or REF43GS?
No-the REF43FZ uses the 8-pin hermetic CERDIP (Q-8) package, while REF43GZ shares the same Q-8 footprint, but REF43GS uses SOIC-8 (R-8), which has different pin spacing and thermal characteristics. Only REF43FZ and REF43GZ are mechanically and electrically pin-compatible within the Q-8 package family.
What is the purpose of the dual ground pins (4A and 4B) on the REF43FZ?
Pins 4A and 4B on the REF43FZ are both internally connected to ground and must be externally bonded to the same low-impedance analog ground plane. This dual-ground configuration reduces ground loop inductance and improves PSRR by providing parallel return paths for internal bias currents and output-stage transients.
REF43FZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.06%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 10µVrms
- Voltage - Input:
- 4.5V ~ 40V
- Current - Supply:
- 450µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
REF43FZ FAQ
1.How can I place an order for REF43FZ through Aetrix?
Please submit a Request for Quotation (RFQ) for REF43FZ 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 REF43FZ reliable?
The price and inventory of REF43FZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF43FZ is usually 5 days.
3.What payment methods are accepted for REF43FZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF43FZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF43FZ?
REF43FZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF43FZ 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 REF43FZ?
For technical support, including REF43FZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF43FZ requirements.
6.How does Aetrix verify that REF43FZ is sourced from the original manufacturer or authorized distributors?
All REF43FZ 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 REF43FZ meets industry standards.
7.What is the process for return or replacement of REF43FZ?
All REF43FZ units undergo pre-shipment inspection (PSI). If there is an issue with REF43FZ, 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 REF43FZ part is unused and in its original packaging.
Return procedure for REF43FZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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