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Microchip Technology 1N825/TR
- Part No.:
- 1N825/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N825/TR.pdf
- Description:
- DIODE ZENER 6.2V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,839
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Product details
Overview
1N825/TR from Central Semiconductor (CDI Diodes) is a temperature-compensated, hermetically sealed MELF zener diode with nominal zener voltage 5.9–6.5 V, 7.5 mA test current, 19 Ω zener impedance, ±0.002 %/°C temperature coefficient, and 500 mW power dissipation at +50°C - used for precision voltage reference in analog instrumentation and regulated power supplies.
For engineers reviewing the 1N825/TR datasheet, 1N825/TR pinout, 1N825/TR application, or 1N825/TR equivalent, key selection criteria include zener voltage tolerance, low dynamic impedance, ultra-low temperature coefficient, high-temperature operation up to +175°C, and MIL-qualified variants (JAN/JANTXV) for aerospace-grade stability.
Technical Context
This device employs metallurgically bonded, double-plug construction to achieve tight voltage regulation and exceptional thermal stability across -65°C to +175°C. Its DO-213AA (MELF/SOD-80/LL34) glass package enables high-reliability surface-mount operation with axial CTE of +6 ppm/°C for matched thermal expansion on PCBs.
The 1N825/TR delivers 19 Ω zener impedance at 7.5 mA, with reverse leakage limited to 2 µA at 3 V, and exhibits a flat temperature coefficient curve optimized near its nominal operating current - critical for low-drift reference designs requiring long-term calibration integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.9–6.5 V @ IZT = 7.5 mA - defines stable regulation range for precision biasing |
| Zener Impedance (ZZT) | 19 Ω @ 7.5 mA - ensures minimal output voltage variation under load transients |
| Temperature Coefficient | ±0.002 %/°C - enables sub-mV drift over full industrial temperature range |
| Power Dissipation | 500 mW @ +50°C, derated 4 mW/°C above - supports high-ambient operation without heatsinking |
| Operating Temperature | -65°C to +175°C - qualified for downhole, aerospace, and military embedded systems |
| Reverse Leakage | 2 µA @ 3 V, 25°C - guarantees low quiescent current in battery-powered references |
Pinout & Package
Package: DO-213AA (MELF), hermetically sealed glass case; lead finish: tin/lead; polarity: cathode band denotes positive terminal during reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to system ground or low-impedance return path for stable reference node |
| Cathode (banded end) | Reverse-bias voltage regulation terminal | Applied to regulated output node; must be held positive relative to anode for zener action |
Key Features
| Feature | Design Value |
|---|---|
| Temperature compensation | ±0.002 %/°C TC enables <1 mV total drift from -55°C to +100°C in reference circuits |
| Hermetic MELF packaging | DO-213AA glass seal prevents moisture ingress and ensures >20-year parametric stability |
| Double-plug metallurgical bond | Eliminates interfacial thermal resistance, improving thermal response time and long-term voltage repeatability |
| MIL-PRF-19500/159 qualification | JAN/JANTXV versions available - meets screening, testing, and traceability requirements for defense electronics |
Applications
| High-Accuracy ADC Reference | Aerospace Power Monitor |
|---|---|
Use Scenario: Provides stable 6.2 V reference for 16-bit SAR ADC in flight control sensor interface. IC Role / Device Role / Timing Role: Precision voltage reference source for analog front-end scaling and offset calibration. Use Value: 19 Ω zener impedance and ±0.002 %/°C TC ensure <0.005% full-scale error over -55°C to +125°C ambient. | Use Scenario: Monitors bus voltage in satellite power distribution unit with radiation-hardened design. IC Role / Device Role / Timing Role: Primary zener reference for isolated DC-DC feedback loop and overvoltage comparator threshold. Use Value: Hermetic DO-213AA package and -65°C to +175°C rating support operation in vacuum and thermal cycling environments. |
| Downhole Oilfield Sensor | Industrial PLC Analog Input |
Use Scenario: Supplies excitation voltage for strain-gauge bridge in borehole pressure transducer. IC Role / Device Role / Timing Role: Low-drift, high-temperature-stable reference for ratiometric measurement circuitry. Use Value: 2 µA reverse leakage at 3 V and 500 mW dissipation enable reliable operation at 150°C junction temperature. | Use Scenario: Sets reference for 4–20 mA transmitter output stage in factory automation module. IC Role / Device Role / Timing Role: Zener-based shunt regulator for isolated loop-powered analog output driver. Use Value: 19 Ω impedance minimizes load-induced error; DO-213AA allows automated SMT placement with IPC Class 3 reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N825A/TR | Zener impedance reduced to 10 Ω at 7.5 mA; same voltage range and TC | Better dynamic regulation in fast transient loads; identical thermal and environmental specs | Select when lower impedance is required without changing layout or thermal design |
| CDLL825 | Same electrical specs; DO-213AA package but non-MIL, commercial-grade screening | No JAN/JANTXV qualification; suitable for cost-sensitive industrial use only | Choose for non-critical applications where MIL traceability and extended screening are unnecessary |
Compared with 1N825/TR, the 1N825A/TR offers improved dynamic regulation via lower impedance, while CDLL825 provides identical performance at lower cost and without military qualification - enabling tiered sourcing based on reliability and compliance requirements.
Availability
1N825/TR is available at Aetrix Electronics and suitable for high-reliability analog instrumentation, aerospace power monitoring, and downhole oilfield sensing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N825/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
Central Semiconductor Corp. (CDI Diodes) designs and manufactures high-reliability discrete semiconductors, specializing in zener, switching, and RF diodes for demanding industrial and defense applications.
The 1N825/TR belongs to CDI's MIL-qualified temperature-compensated zener family, engineered specifically for precision voltage reference in mission-critical systems where long-term stability and extreme-temperature operation are mandatory.
FAQ
What is the nominal zener voltage range of the 1N825/TR?
The 1N825/TR has a nominal zener voltage range of 5.9 V to 6.5 V at a test current of 7.5 mA. This range reflects manufacturing tolerance and ensures compatibility with circuits designed for 6.2 V nominal regulation. The actual measured voltage for any given 1N825/TR unit falls within this band under specified test conditions.
Does the 1N825/TR require external heat sinking in standard operation?
No, the 1N825/TR does not require external heat sinking under typical conditions. It is rated for 500 mW power dissipation at +50°C ambient and derates linearly at 4 mW/°C above that temperature. At room temperature and ≤100 mW dissipation, junction temperature rise remains well within safe limits using standard PCB copper area.
Is the 1N825/TR compatible with reflow soldering processes?
Yes, the 1N825/TR in DO-213AA (MELF) package is compatible with standard leaded reflow profiles, including peak temperatures up to 235°C for ≤60 seconds. Its hermetic glass construction and tin/lead lead finish support robust SMT assembly; however, thermal shock avoidance per J-STD-020 is recommended due to glass-body sensitivity.
How does the temperature coefficient of the 1N825/TR compare to standard zener diodes?
The 1N825/TR features a temperature coefficient of ±0.002 %/°C - over 10× tighter than typical 5% TC zeners and comparable to high-end compensated references. This ultra-low TC is achieved via double-plug construction and process optimization, enabling sub-millivolt drift over -55°C to +100°C - critical for metrology-grade designs.
Can the 1N825/TR be used as a direct replacement for CDLL825 in existing designs?
Yes, the 1N825/TR is electrically and physically identical to CDLL825 - same DO-213AA package, zener voltage, impedance, and temperature coefficient. The key distinction is qualification: 1N825/TR carries JAN/JANTXV screening per MIL-PRF-19500/159, whereas CDLL825 is commercial grade. Layout and schematic remain unchanged.
1N825/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 15 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-204AH (DO-35)
1N825/TR FAQ
1.How can I place an order for 1N825/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N825/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 1N825/TR reliable?
The price and inventory of 1N825/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N825/TR is usually 5 days.
3.What payment methods are accepted for 1N825/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N825/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N825/TR?
1N825/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N825/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 1N825/TR?
For technical support, including 1N825/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N825/TR requirements.
6.How does Aetrix verify that 1N825/TR is sourced from the original manufacturer or authorized distributors?
All 1N825/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 1N825/TR meets industry standards.
7.What is the process for return or replacement of 1N825/TR?
All 1N825/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N825/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 1N825/TR part is unused and in its original packaging.
Return procedure for 1N825/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N825/TR Tags
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