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Microchip Technology 1N6340US/TR
- Part No.:
- 1N6340US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6340US/TR.pdf
- Description:
- DIODE ZENER 47V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N6340US/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode with nominal Zener voltage 47.0 V ±5%, 0.5 W power rating, and 75 mA maximum Zener current (IZM), designed for precision voltage regulation in high-reliability aerospace and defense power supply circuits.
For engineers reviewing the 1N6340US/TR datasheet, 1N6340US/TR pinout, 1N6340US/TR application, or 1N6340US/TR equivalent, this part delivers stable regulation over -65 °C to +175 °C, low dynamic impedance (900 Ω @ 75 mA), and radiation-hardened construction per MicroNote 050 - critical for mission-critical analog reference and overvoltage protection designs.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at precisely defined Zener voltage (VZ = 47.0 V) when biased above its knee current (IZK = 2.7 mA). Its voidless glass package with internal metallurgical bond ensures long-term parameter stability under thermal cycling and mechanical stress.
It exhibits a positive temperature coefficient of +0.095 %/°C, enabling predictable drift compensation in series-connected references. Thermal resistance junction-to-end cap is 21 °C/W (1N6321US–1N6355US group), supporting reliable derating up to 150 °C end-cap temperature per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47.0 V ±5% @ IZ = 75 mA - defines precise regulation point for feedback loops and reference rails |
| Max Power Dissipation | 0.5 W @ TEC = 150 °C - sets absolute thermal limit for continuous operation on PCBs with defined copper area |
| Dynamic Impedance (ZZ) | 900 Ω @ IZ = 75 mA - determines output voltage ripple rejection under load transients |
| Max Reverse Current (IR) | 10 µA @ VR = 36 V - ensures minimal leakage in standby or high-impedance bias networks |
| Junction Temp Range | -65 °C to +175 °C - enables deployment in extreme-environment avionics and downhole electronics |
| Temp Coefficient (αVZ) | +0.095 %/°C - allows accurate prediction of VZ drift across operating temperature range |
| Noise Density | 80 µV/√Hz @ 1–3 kHz - impacts signal integrity in precision analog measurement front-ends |
Pinout & Package
Hermetically sealed B-SQ MELF ("D") package with axial symmetry; cathode indicated by single black band; end caps are copper with tin/lead finish; 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 ground or lower-potential node in shunt regulator configuration |
| Cathode | Reverse-biased Zener terminal / high-side connection | Banded end; connects to unregulated input rail to clamp voltage at VZ |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and parameter drift over 20+ year field life in sealed enclosures |
| Category I metallurgical bond | Ensures mechanical robustness against shock/vibration per MIL-STD-883 Method 2002 |
| MIL-PRF-19500/533 qualified | Validated reliability levels (JAN/JANTXV/JANS) support DO-254 and MIL-HDBK-217F failure rate modeling |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) ≥100 krad(Si), per MicroNote 050 |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - no external protection required in handling |
Applications
| Aerospace Power Conditioning | Defense System Reference |
|---|---|
Use Scenario: Regulating auxiliary 48 V bus in satellite power distribution units under wide thermal excursions. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 47 V clamp for DC-DC converter feedback divider. Use Value: Maintains ±0.5% output accuracy over -55 °C to +125 °C ambient due to tight VZ tolerance and known αVZ. |
Use Scenario: Precision voltage reference in missile guidance inertial measurement unit (IMU) analog front-end. IC Role / Device Role / Timing Role: Primary reference source for 16-bit ADC biasing and sensor excitation circuitry. Use Value: Delivers <10 µV/√Hz noise floor and <0.01% long-term drift, meeting MIL-STD-810G environmental stability requirements. |
| Nuclear Instrumentation | Downhole Telemetry |
Use Scenario: Biasing photomultiplier tube (PMT) high-voltage supply in radiation monitoring spectrometers. IC Role / Device Role / Timing Role: Stable Zener element in cascaded multiplier chain ensuring consistent gain calibration. Use Value: Radiation hardness enables uninterrupted operation at >50 krad(Si) cumulative dose without parameter shift. |
Use Scenario: Overvoltage protection for 4–20 mA loop-powered sensors in oil/gas wellhead controllers. IC Role / Device Role / Timing Role: Clamp diode safeguarding analog input stage against lightning-induced surges. Use Value: Withstands 36 A non-repetitive surge (8.3 ms square wave) while maintaining post-surge VZ within spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6340US | Same electrical specs and package; TR suffix denotes tape-and-reel packaging only - no functional difference | Identical use in automated SMT assembly; same thermal and reliability performance | Select 1N6340US/TR for pick-and-place line compatibility; select 1N6340US for manual prototyping or low-volume hand soldering |
| SMF47 | Commercial-grade SOD-123 surface-mount Zener; 47 V ±5%, 0.5 W, but not MIL-qualified or radiation-hardened | Limited to industrial-grade systems without TID or shock/vibration certification requirements | Choose SMF47 only for cost-sensitive, non-mission-critical applications where MIL-PRF-19500 compliance is unnecessary |
Compared with 1N6340US/TR, the bare 1N6340US offers identical performance in bulk packaging, while SMF47 provides footprint compatibility at the expense of military qualification, radiation hardness, and hermetic reliability - making it unsuitable for aerospace or defense deployments.
Availability
1N6340US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system reference design, and nuclear instrumentation requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N6340US/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N63xxUS series belongs to Microsemi's military-qualified Zener diode product line, engineered specifically for applications demanding hermetic sealing, radiation tolerance, and extended temperature operation beyond commercial limits.
FAQ
What is the Zener voltage tolerance of the 1N6340US/TR?
1N6340US/TR has a nominal Zener voltage of 47.0 V with a standard tolerance of ±5%, as specified in the Electrical Characteristics table at IZ = 75 mA. Tighter tolerances (±1% and ±2%) are available under different part number suffixes (e.g., "D" or "C"), but the "TR" suffix indicates standard 5% tolerance in tape-and-reel packaging. This tolerance directly affects regulation accuracy in precision feedback networks.
Is the 1N6340US/TR RoHS compliant?
The 1N6340US/TR is not RoHS compliant. Per the datasheet, RoHS-compliant versions (e.g., with "e3" suffix) are available only for commercial-grade parts, and the 1N6340US/TR is a military-qualified part with tin/lead (Sn/Pb) end-cap finish. Its qualification to MIL-PRF-19500/533 requires legacy Pb-based metallurgy for proven long-term reliability under thermal cycling.
What does the "US" suffix mean in 1N6340US/TR?
The "US" suffix in 1N6340US/TR denotes the B-SQ MELF ("D") surface-mount package - a voidless hermetically sealed glass construction with tungsten slugs and copper end caps. It distinguishes this military-grade MELF variant from axial-leaded DO-35 versions (e.g., 1N6340) and confirms compliance with MIL-PRF-19500/533 Category I bonding standards.
What is the maximum surge current rating for the 1N6340US/TR?
The 1N6340US/TR supports a non-repetitive peak Zener surge current (IZSM) of 36 A for an 8.3 ms square-wave pulse, as specified in the Electrical Characteristics table. This rating enables robust transient overvoltage clamping in power supply inputs and sensor interfaces exposed to ESD or inductive switching events.
How does the temperature coefficient affect the 1N6340US/TR in circuit design?
The 1N6340US/TR has a positive temperature coefficient of +0.095 %/°C, meaning its Zener voltage increases predictably with temperature. Designers use this known drift to compensate other components (e.g., series-connected NTC thermistors or complementary diodes) in high-stability references, especially in environments spanning -65 °C to +175 °C where passive compensation is essential.
1N6340US/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):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 75 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 36 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
1N6340US/TR FAQ
1.How can I place an order for 1N6340US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6340US/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 1N6340US/TR reliable?
The price and inventory of 1N6340US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6340US/TR is usually 5 days.
3.What payment methods are accepted for 1N6340US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6340US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6340US/TR?
1N6340US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6340US/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 1N6340US/TR?
For technical support, including 1N6340US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6340US/TR requirements.
6.How does Aetrix verify that 1N6340US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6340US/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 1N6340US/TR meets industry standards.
7.What is the process for return or replacement of 1N6340US/TR?
All 1N6340US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6340US/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 1N6340US/TR part is unused and in its original packaging.
Return procedure for 1N6340US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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