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Microchip Technology 1N6338US/TR
- Part No.:
- 1N6338US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6338US/TR.pdf
- Description:
- DIODE ZENER 39V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N6338US/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode with nominal Zener voltage of 39.0 V ±5%, 0.5 W power rating, and 55 mA maximum Zener current (IZM), designed for precision voltage regulation in high-reliability aerospace, defense, and industrial control systems.
For engineers reviewing the 1N6338US/TR datasheet, 1N6338US/TR pinout, 1N6338US/TR application, or 1N6338US/TR equivalent, this part delivers stable regulation across -65 °C to +175 °C, low dynamic impedance (11 Ω at IZ = 55 mA), and radiation-hardened performance per MicroNote 050 - critical for mission-critical analog reference and overvoltage protection circuits.
Technical Context
This Zener diode operates in reverse breakdown with tightly controlled voltage regulation (ΔVZ = 1.90 V between 10%–50% IZM at 25 °C) and exhibits a positive temperature coefficient of +0.094 %/°C, enabling predictable thermal drift compensation in precision references. Its voidless glass package with internal metallurgical bond ensures long-term stability under thermal cycling and mechanical stress.
Rated for 0.5 W steady-state dissipation at TEC = 150 °C, it features junction-to-end-cap thermal resistance of 21 °C/W (1N6321US–1N6355US group), enabling reliable operation on minimal copper land patterns. Reverse leakage remains ≤0.05 µA at VR = 30 V and ≤10 µA at 150 °C - essential for low-power biasing and sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39.0 V ±5% at IZ = 55 mA - defines precise regulation point for reference and clamp circuits |
| Power Dissipation (PD) | 0.5 W @ TEC = 150 °C - sets maximum continuous power handling on end-cap heatsink |
| Max Zener Current (IZM) | 55 mA - determines upper limit of safe DC regulation current before thermal runaway |
| Dynamic Impedance (ZZ) | 11 Ω @ IZ = 55 mA - ensures minimal output voltage variation under load transients |
| Junction Temp Range | -65 °C to +175 °C - supports operation in extreme environments without derating loss |
| Temp Coefficient (αVZ) | +0.094 %/°C - enables predictable voltage drift for temperature-compensated designs |
| Reverse Leakage (IR) | ≤0.05 µA @ VR = 30 V, 25 °C - guarantees negligible error current in high-impedance bias networks |
Pinout & Package
Hermetically sealed B-SQ MELF ("D") package with axial symmetry: two identical end-cap terminals; cathode identified by black band. No polarity-sensitive orientation required for PCB placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in Zener clamp | Connected to lower potential node; carries forward current up to 1.0 A (VF = 1.4 V) |
| Cathode | Reverse breakdown terminal / regulated output node | Banded end; provides stable 39.0 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal voids - ensures >20-year reliability in sealed enclosures |
| Category I metallurgical bond | Validated per MIL-PRF-19500/533 for 1N6321US–1N6355US - prevents interfacial delamination under shock/vibe |
| Radiation hardness | Inherently hardened per MicroNote 050 - suitable for space-grade analog references without shielding |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - survives >4 kV HBM without parameter shift |
| MIL-qualified reliability levels | JAN, JANTX, JANTXV, JANS available - meets screening and test requirements for flight-critical hardware |
Applications
| Aerospace Power Monitoring | Defense System Reference |
|---|---|
|
Use Scenario: Monitoring 28 VDC aircraft bus voltage with ±0.5% accuracy over -55 °C to +125 °C. IC Role / Device Role / Timing Role: Precision shunt reference for ADC input scaling and overvoltage detection circuitry. Use Value: 39.0 V Zener voltage enables direct 28 V rail monitoring via resistive divider; ±5% tolerance and +0.094 %/°C TC allow calibrated offset correction. |
Use Scenario: Providing stable 39 V reference for missile guidance sensor signal conditioning. IC Role / Device Role / Timing Role: Primary voltage reference in analog front-end for inertial measurement unit (IMU) amplifiers. Use Value: Hermetic glass construction and radiation hardness ensure no parameter drift during high-altitude exposure; 11 Ω dynamic impedance maintains reference stability under sensor load variations. |
| Industrial PLC Input Protection | Nuclear Instrumentation Biasing |
|
Use Scenario: Clamping 4–20 mA loop inputs against 100 V transients in factory automation cabinets. IC Role / Device Role / Timing Role: Shunt overvoltage protector placed across input resistor network. Use Value: 0.5 W rating and 30 V working peak voltage (VWM) absorb repeated 8/20 µs surges without degradation; cathode band enables unambiguous PCB orientation. |
Use Scenario: Biasing photomultiplier tube (PMT) dynodes in radiation detection equipment. IC Role / Device Role / Timing Role: High-stability DC bias source for multi-stage electron multiplication chain. Use Value: ≤0.05 µA reverse leakage at 30 V prevents dark current injection; -65 °C to +175 °C range accommodates coolant-cooled detector housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6338US (non-TR) | Same electrical specs and package; differs only in packaging (bulk vs. tape-and-reel) | No functional difference; TR version supports automated SMT placement | Select 1N6338US/TR for volume production with pick-and-place; choose bulk 1N6338US for prototyping or manual assembly |
| SMF39A (ON Semiconductor) | Surface-mount SOD-123 package; 39 V ±5%; 0.4 W rating; higher RθJA (350 °C/W) | Limited to commercial temp range (-65 °C to +150 °C); not MIL-qualified or radiation-hardened | Use SMF39A only in cost-sensitive, non-mission-critical commercial designs where hermeticity and extended temp range are not required |
Compared with 1N6338US/TR, the bulk 1N6338US offers identical performance with manual handling convenience, while SMF39A trades military qualification and thermal robustness for smaller footprint and lower cost in benign environments.
Availability
1N6338US/TR is available at Aetrix Electronics and suitable for aerospace power monitoring, defense system reference, and industrial PLC input protection requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N6338US/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 analog, RF, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N63xxUS series belongs to Microsemi's military-qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance and test condition for 1N6338US/TR?
The 1N6338US/TR has a nominal Zener voltage of 39.0 V with ±5% tolerance, measured at a test current (IZ) of 55 mA and ambient temperature of 25 °C. This tolerance aligns with the standard JEDEC specification for the 1N6309US–1N6355US family and is verified per MIL-PRF-19500/533 screening requirements.
Does 1N6338US/TR meet MIL-PRF-19500/533 qualification?
Yes, the 1N6338US/TR is qualified per MIL-PRF-19500/533 at JAN, JANTX, JANTXV, and JANS reliability levels. It undergoes full military screening including burn-in, temperature cycling, and hermeticity testing - confirmed in the official Microsemi datasheet T4-LDS-0193-1 Rev. 1.
What is the maximum reverse leakage current for 1N6338US/TR at elevated temperature?
At 150 °C and rated working peak voltage (VR = 30 V), the 1N6338US/TR exhibits a maximum reverse leakage current (IR2) of 10 µA. At 25 °C and the same VR, leakage is limited to ≤0.05 µA - critical for low-power bias networks in high-temperature avionics.
Can 1N6338US/TR be used in surface-mount applications?
Yes, the 1N6338US/TR uses the B-SQ MELF ("D") surface-mount package with copper end caps and Sn/Pb or RoHS-compliant matte tin finish. It is compatible with standard reflow profiles up to 260 °C for 10 seconds and supports EIA-481-B tape-and-reel feeding for automated assembly.
How does the temperature coefficient affect regulation accuracy of 1N6338US/TR?
The 1N6338US/TR has a positive temperature coefficient of +0.094 %/°C, meaning its Zener voltage increases by ~0.037 V per 10 °C rise. This predictable drift allows designers to compensate reference circuits in wide-temperature applications - especially valuable in aerospace and nuclear instrumentation where calibration stability is mandatory.
1N6338US/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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30 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
1N6338US/TR FAQ
1.How can I place an order for 1N6338US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6338US/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 1N6338US/TR reliable?
The price and inventory of 1N6338US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6338US/TR is usually 5 days.
3.What payment methods are accepted for 1N6338US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6338US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6338US/TR?
1N6338US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6338US/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 1N6338US/TR?
For technical support, including 1N6338US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6338US/TR requirements.
6.How does Aetrix verify that 1N6338US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6338US/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 1N6338US/TR meets industry standards.
7.What is the process for return or replacement of 1N6338US/TR?
All 1N6338US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6338US/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 1N6338US/TR part is unused and in its original packaging.
Return procedure for 1N6338US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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