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Microchip Technology 1N6326DUS/TR
- Part No.:
- 1N6326DUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6326DUS/TR.pdf
- Description:
- DIODE ZENER 12V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:58
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Product details
Overview
1N6326DUS/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode in MELF (B-SQ) package, rated for 12.0 V nominal Zener voltage at 20 mA with ±1% tolerance, 0.5 W power dissipation, and junction temperature range of –65 °C to +175 °C. It serves as a precision voltage reference or regulator in high-reliability aerospace, defense, and industrial control systems requiring stable biasing under wide thermal stress.
For engineers reviewing the 1N6326DUS/TR datasheet, 1N6326DUS/TR pinout, 1N6326DUS/TR application, or 1N6326DUS/TR equivalent, this page delivers verified electrical characteristics, MIL-PRF-19500/533 qualification status, thermal derating curves, dynamic impedance (550 Ω @ 20 mA), and RoHS-compliant commercial-grade availability - all critical for radiation-hardened, ESD-insensitive, and long-lifecycle designs.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation (ΔVZ = 0.55 V between 10%–50% IZM), low dynamic impedance (550 Ω @ IZ = 20 mA), and minimal temperature coefficient (+0.083 %/°C). Its internal Category I metallurgical bond ensures mechanical robustness and reliability across shock/vibration environments.
Designed for DC voltage regulation over broad current (250 µA to 9.0 mA max) and temperature (–65 °C to +175 °C) ranges, it exhibits non-sensitive ESD behavior per MIL-STD-750 Method 1020 and inherent radiation hardness per MicroNote 050 - key for space-qualified and nuclear instrumentation applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.0 V nominal @ 20 mA - defines precise regulation point for reference/bias circuits |
| Voltage Tolerance | ±1% - enables high-accuracy voltage references without post-calibration |
| Power Dissipation | 0.5 W @ TEC = 150 °C - supports stable operation in compact, conduction-cooled layouts |
| Dynamic Impedance | 550 Ω @ 20 mA - limits output voltage variation under load transients |
| Junction Temp Range | –65 °C to +175 °C - qualified for extreme environmental operation in avionics and downhole tools |
| Thermal Resistance | 21 °C/W (Junction-to-End Cap) - enables accurate thermal modeling for end-cap heatsinking |
| Surge Current | 9.0 A (8.3 ms square wave) - withstands transient overvoltage events without degradation |
Pinout & Package
Hermetically sealed voidless glass MELF (B-SQ) package with copper end caps (Sn/Pb or RoHS matte tin finish); cathode indicated by band; weight 0.0945 g; dimensions: BD = 0.070–0.085 in (1.78–2.16 mm), BL = 0.165–0.195 in (4.19–4.95 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Reverse-biased Zener terminal / high-side connection | Banded end; connected to regulated voltage rail or input supply for clamping/reference |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/533 Qualified | Available in JAN, JANTX, JANTXV, and JANS reliability levels - meets stringent screening for mission-critical systems |
| Voidless Hermetic Glass Construction | Eliminates internal delamination and moisture ingress - ensures >20-year shelf life and field stability |
| Category I Metallurgical Bond | Used in 1N6321US–1N6355US series - provides superior mechanical integrity under thermal cycling and vibration |
| Radiation Hardness | Inherently radiation-tolerant per MicroNote 050 - suitable for low-dose space and nuclear environments |
| ESD Immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external protection in handling and assembly |
Applications
| Aerospace Power Conditioning | Defense Avionics Reference |
|---|---|
Use Scenario: Regulating bias voltage for analog front-end amplifiers in satellite telemetry receivers operating across –55 °C to +125 °C. IC Role / Device Role / Timing Role: Precision Zener reference providing stable 12 V rail for op-amp offset trimming and ADC reference scaling. Use Value: ±1% VZ tolerance and +0.083 %/°C TC ensure <±15 mV drift over full temperature range - eliminating recalibration. | Use Scenario: Voltage clamping in radar pulse modulator gate drive circuits exposed to EMP transients. IC Role / Device Role / Timing Role: Transient suppression element absorbing 8.3 ms surge energy while maintaining 12 V clamp level. Use Value: 9.0 A surge rating and hermetic glass construction prevent latent failure after repeated EMP exposure. |
| Industrial Process Controller | Nuclear Instrumentation |
Use Scenario: Providing isolated 12 V reference for 4–20 mA loop-powered sensor transmitters in oil refinery control cabinets. IC Role / Device Role / Timing Role: Primary voltage reference in two-wire transmitter ICs requiring long-term stability and low leakage. Use Value: IR ≤ 10 µA @ VR = 9.9 V ensures minimal current draw from loop - preserving headroom for sensor excitation. | Use Scenario: Biasing photomultiplier tube (PMT) dynode chains in radiation monitoring spectrometers deployed in reactor containment zones. IC Role / Device Role / Timing Role: High-stability Zener supplying graded dynode voltages in ultra-low-noise, high-voltage chains. Use Value: Inherent radiation hardness and 0.55 V regulation error enable uninterrupted operation at 10 krad(Si) total ionizing dose. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6326CUS/TR | ±2% Zener tolerance (vs. ±1% for 1N6326DUS/TR); otherwise identical electrical and mechanical specs | Suitable where tighter regulation not required; lower cost for non-critical biasing | Select when ±2% VZ accuracy suffices and MIL-PRF-19500/533 compliance remains mandatory |
| SMF12A | Surface-mount SOD-123 package; 12 V, ±5%; 1.0 W Pd; higher IZM (83 mA); no MIL qualification | Commercial industrial use only; lacks radiation hardness, ESD immunity, and hermetic sealing | Choose for cost-sensitive, non-military PCBs where board space and reflow compatibility outweigh reliability requirements |
Compared with 1N6326CUS/TR and SMF12A, the 1N6326DUS/TR uniquely combines ±1% tolerance, MIL-PRF-19500/533 qualification, hermetic MELF packaging, and radiation hardness - making it irreplaceable in flight-critical and nuclear-grade designs where parameter drift or latent failure is unacceptable.
Availability
1N6326DUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense avionics reference, and nuclear instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N6326DUS/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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and military-qualified analog and mixed-signal components.
The 1N63xxUS series was developed to meet MIL-PRF-19500/533 requirements for hermetic, voidless-glass Zener diodes used in precision voltage regulation within aerospace, defense, and nuclear systems.
FAQ
What is the Zener voltage tolerance of the 1N6326DUS/TR?
The 1N6326DUS/TR has a Zener voltage tolerance of ±1%, as indicated by the "D" in its part number per Microsemi's nomenclature. This corresponds to a nominal 12.0 V Zener voltage ranging from 11.0 V to 13.0 V at 20 mA test current, enabling high-accuracy voltage referencing in mission-critical circuits where calibration margin is constrained.
Is the 1N6326DUS/TR RoHS compliant?
The 1N6326DUS/TR is available in RoHS-compliant versions only for commercial-grade units (marked with "e3" suffix), per Microsemi documentation. Military-grade variants (JAN/JANTX/JANTXV/JANS) retain Sn/Pb terminations to meet MIL-PRF-19500/533 solderability and reliability requirements. Always verify suffix and grade before specifying for RoHS-constrained programs.
What is the maximum surge current rating for the 1N6326DUS/TR?
The 1N6326DUS/TR is rated for a non-repetitive peak Zener surge current (IZSM) of 9.0 A under an 8.3 ms square-wave waveform, as specified in the Electrical Characteristics table. This rating reflects its ability to absorb transient energy without parametric shift or catastrophic failure - critical for protecting downstream circuitry in EMP-prone or lightning-exposed systems.
Does the 1N6326DUS/TR require heatsinking in standard PCB layouts?
No external heatsink is required for the 1N6326DUS/TR at ambient temperatures ≤55 °C and power dissipation ≤0.5 W, due to its low thermal resistance (21 °C/W junction-to-end cap). However, end-cap thermal coupling to a copper plane or thermal pad is recommended to maintain TEC ≤150 °C under continuous operation - especially in enclosed or high-temperature enclosures.
How does the temperature coefficient affect the 1N6326DUS/TR's performance at 125 °C?
The 1N6326DUS/TR has a Zener voltage temperature coefficient of +0.083 %/°C. At 125 °C (100 °C above 25 °C reference), VZ increases by approximately +100 × 0.083 % = +8.3 %, or +0.996 V - resulting in ~12.996 V. This predictable positive drift is factored into design margins for high-temperature voltage references and bias networks.
1N6326DUS/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, B
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±1%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.4 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- B, SQ-MELF
1N6326DUS/TR FAQ
1.How can I place an order for 1N6326DUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6326DUS/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 1N6326DUS/TR reliable?
The price and inventory of 1N6326DUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6326DUS/TR is usually 5 days.
3.What payment methods are accepted for 1N6326DUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6326DUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6326DUS/TR?
1N6326DUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6326DUS/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 1N6326DUS/TR?
For technical support, including 1N6326DUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6326DUS/TR requirements.
6.How does Aetrix verify that 1N6326DUS/TR is sourced from the original manufacturer or authorized distributors?
All 1N6326DUS/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 1N6326DUS/TR meets industry standards.
7.What is the process for return or replacement of 1N6326DUS/TR?
All 1N6326DUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6326DUS/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 1N6326DUS/TR part is unused and in its original packaging.
Return procedure for 1N6326DUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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