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Microchip Technology 1N4574/TR
- Part No.:
- 1N4574/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4574/TR.pdf
- Description:
- DIODE ZENER 6.4V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:7,838
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Product details
Overview
1N4574/TR from Microsemi is a temperature-compensated 6.4 V Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for 1.0 mA test current, 0.0005 %/°C temperature coefficient, 100 Ω dynamic impedance, and ±5% nominal voltage tolerance. It delivers ultra-stable voltage reference performance across -55°C to +100°C operating range and is used in precision instrumentation calibration circuits.
For engineers reviewing the 1N4574/TR datasheet, 1N4574/TR pinout, 1N4574/TR application, or 1N4574/TR equivalent, key selection criteria include its 1.0 mA Zener test current, hermetically sealed DO-7 package, MIL-PRF-19500/452 qualification readiness, low TC of 0.0005 %/°C, and suitability for high-reliability analog reference designs requiring minimal drift over temperature.
Technical Context
This device belongs to Microsemi's zero-temperature-coefficient Zener series, where compensation is achieved via internal metallurgical bonding of two junctions with opposing TCs. Its 6.4 V nominal Zener voltage is optimized for minimal curvature in the VZ vs. temperature curve over 0°C to +75°C.
The 1N4574/TR operates at 1.0 mA IZT, delivering 100 Ω dynamic impedance at that current and maintaining voltage stability under load variations typical in analog front-end biasing and ADC reference buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 6.4 V ±5% - defines stable reference point for precision analog circuits |
| Zener Test Current (IZT) | 1.0 mA - required bias current to achieve specified VZ and TC performance |
| Temperature Coefficient | 0.0005 %/°C - enables <0.03 mV/°C drift, critical for wide-temperature-range instrumentation |
| Dynamic Impedance (ZZT) | 100 Ω @ IZT - limits output voltage variation under changing load current |
| Operating Temperature Range | -55°C to +100°C - supports deployment in military-grade and industrial control environments |
| Package | DO-7 (DO-204AA) - hermetically sealed glass axial-leaded package with tin-lead solderable leads |
| Max Power Dissipation | 500 mW @ TL = 25°C - sets thermal design margin for PCB layout and heatsinking |
Pinout & Package
DO-7 (DO-204AA) package: hermetically sealed glass case with axial leads; cathode identified by band; operated with banded end positive (anode grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; establishes reference potential for cathode output |
| Cathode | Stable 6.4 V output node | Provides regulated voltage source; must be biased positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Temperature-compensated Zener structure | Internal metallurgical bonding achieves near-zero TC over -55°C to +100°C |
| MIL-PRF-19500/452 qualification path | Add JAN/JANTX/JANTXV prefix + "-1" suffix (e.g., JANTX1N4574A-1) for military screening |
| Hermetic glass sealing | Ensures long-term parameter stability and moisture resistance in harsh environments |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection |
| Tape-and-reel packaging option | "TR" suffix denotes EIA-296 compliant reel format for automated SMT placement |
Applications
| High-Precision ADC Reference | Aerospace Sensor Signal Conditioning |
|---|---|
Use Scenario: Provides reference voltage for 16-bit+ successive approximation ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Voltage reference diode supplying stable 6.4 V to ADC reference input. Use Value: 0.0005 %/°C TC ensures <±0.5 LSB error contribution over -40°C to +85°C ambient. |
Use Scenario: Biasing and calibration reference in inertial measurement unit (IMU) front-end amplifiers. IC Role / Device Role / Timing Role: Precision DC reference for op-amp offset nulling and gain-setting networks. Use Value: Hermetic DO-7 package and -55°C to +100°C operation support extended mission profiles in avionics. |
| Industrial PLC Analog Input Modules | Military Power Supply Trim Circuits |
Use Scenario: Reference source for isolated 4–20 mA transmitter current loop calibration. IC Role / Device Role / Timing Role: Stable Zener reference for DAC output scaling and current-sense amplifier biasing. Use Value: 100 Ω dynamic impedance minimizes output shift during 24 V loop voltage transients. |
Use Scenario: Voltage setpoint element in radiation-tolerant DC-DC converter feedback networks. IC Role / Device Role / Timing Role: Primary reference in trim-adjustable regulation loops requiring long-term drift stability. Use Value: MIL-PRF-19500/452 qualification path enables direct integration into JANTXV-level power subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4574A/TR | Same 6.4 V nominal, 1.0 mA IZT, and 0.0005 %/°C TC, but tighter ±1% initial tolerance (vs. ±5% for 1N4574/TR) | Preferred where factory-calibrated accuracy reduces system-level trimming effort | Select 1N4574A/TR when tighter initial VZ tolerance is required without redesign |
| LM399H | Subsurface Zener with buried Zener and heater; 6.95 V output, 0.3 ppm/°C TC, requires 10 mA bias and thermal stabilization | Used in metrology-grade instruments where ultra-low drift (<1 ppm total) outweighs power and complexity cost | Choose LM399H only when sub-ppm stability justifies added board space, power, and thermal management |
Compared with 1N4574A/TR, the 1N4574/TR offers lower cost and simpler biasing but requires system-level calibration for ±5% initial tolerance; versus LM399H, it trades absolute stability for compact size, zero heater power, and immediate turn-on stability.
Availability
1N4574/TR is available at Aetrix Electronics and suitable for high-reliability analog reference, aerospace sensor conditioning, and industrial PLC analog input modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4574/TR 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and precision analog components for defense, aerospace, and industrial markets.
The 1N4574/TR belongs to Microsemi's legacy Scottsdale Division zero-TC Zener reference diode family, engineered for minimal voltage drift in mission-critical instrumentation and control systems where long-term stability outweighs cost sensitivity.
FAQ
What is the Zener test current for the 1N4574/TR?
The 1N4574/TR is specified at a Zener test current (IZT) of 1.0 mA. This current must be applied for 15 seconds before measuring the 6.4 V nominal Zener voltage to ensure stable thermal conditions and accurate TC characterization. Operating significantly above or below this current increases dynamic impedance and degrades temperature coefficient performance.
Does the 1N4574/TR have military qualification?
The 1N4574/TR itself is not pre-qualified, but it is the base commercial version of a MIL-PRF-19500/452-compliant family. Adding the JANTX prefix and "-1" suffix (e.g., JANTX1N4574A-1) yields the screened military variant. The 1N4574/TR shares identical DO-7 packaging, metallurgical construction, and electrical characteristics with those qualified versions.
What does the "TR" suffix mean in 1N4574/TR?
The "TR" suffix in 1N4574/TR indicates tape-and-reel packaging per EIA-296 standard, enabling automated pick-and-place assembly. This format contains the same DO-7 glass axial-leaded device as the bulk version, with no electrical or reliability differences-only mechanical handling optimization for high-volume manufacturing.
How does the 1N4574/TR achieve its 0.0005 %/°C temperature coefficient?
The 1N4574/TR achieves ultra-low TC through internal metallurgical bonding of complementary Zener and forward-biased junctions whose opposing temperature coefficients cancel over -55°C to +100°C. This zero-TC architecture is intrinsic to the die structure and does not require external compensation components or heater circuits.
Can the 1N4574/TR replace the 1N4574A/TR in a design?
Yes, the 1N4574/TR can replace the 1N4574A/TR electrically and mechanically, but with a trade-off: the 1N4574/TR has ±5% initial voltage tolerance versus ±1% for the "A" version. System-level calibration may be needed if the design relies on tighter initial accuracy, though long-term drift performance remains identical due to matching TC and construction.
1N4574/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-7
1N4574/TR FAQ
1.How can I place an order for 1N4574/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4574/TR 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 1N4574/TR reliable?
The price and inventory of 1N4574/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4574/TR is usually 5 days.
3.What payment methods are accepted for 1N4574/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4574/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4574/TR?
1N4574/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4574/TR 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 1N4574/TR?
For technical support, including 1N4574/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4574/TR requirements.
6.How does Aetrix verify that 1N4574/TR is sourced from the original manufacturer or authorized distributors?
All 1N4574/TR 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 1N4574/TR meets industry standards.
7.What is the process for return or replacement of 1N4574/TR?
All 1N4574/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4574/TR, 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 1N4574/TR part is unused and in its original packaging.
Return procedure for 1N4574/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4574/TR Tags
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