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Microchip Technology 1N6344US/TR
- Part No.:
- 1N6344US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6344US/TR.pdf
- Description:
- DIODE ZENER 68V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:70
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Product details
Overview
1N6344US/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode in MELF (B-SQ) package, rated for 0.5 W steady-state power dissipation at 150 °C end-cap temperature, with nominal Zener voltage of 68.0 V ±5%, dynamic impedance of 1.5 kΩ at 155 mA test current, and maximum surge current of 52 A (8.3 ms square wave). It serves as a precision voltage reference and overvoltage clamp in high-reliability aerospace power conditioning circuits.
For engineers reviewing the 1N6344US/TR datasheet, 1N6344US/TR pinout, 1N6344US/TR application, or 1N6344US/TR equivalent, key selection criteria include its MIL-PRF-19500/533 qualification level (JANTXV), tight thermal resistance junction-to-end-cap (21 °C/W), radiation-hardened construction per MicroNote 050, and ESD immunity per MIL-STD-750 Method 1020.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased breakdown mode, with Zener voltage specified at IZ2 = 155 mA and minimum regulation current IZK = 1.8 mA. Its internal metallurgical bond is Category I per MIL-PRF-19500/533, ensuring reliability under thermal cycling and mechanical shock.
The 1N6344US/TR exhibits a positive temperature coefficient of +0.101 %/°C for VZ, enabling predictable drift compensation in wide-temperature-range designs. Its noise density is 80 µV/√Hz (1–3 kHz), supporting low-noise analog reference applications where stability outweighs ultra-low-noise requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68.0 V ±5% at IZ2 = 155 mA - defines stable regulation point for high-voltage bias networks |
| Power Dissipation (PD) | 0.5 W @ TEC = 150 °C - sets maximum continuous DC power handling with defined thermal path |
| Dynamic Impedance (ZZT) | 1.5 kΩ @ 155 mA - determines output voltage variation under load current changes |
| Max Surge Current (IZSM) | 52 A (8.3 ms square wave) - supports transient overvoltage clamping without failure |
| Junction Temp Range (TJ) | −65 °C to +175 °C - enables operation in extreme environmental conditions including space-grade thermal cycles |
| Thermal Resistance (RθJEC) | 21 °C/W - quantifies thermal efficiency from junction to end cap, critical for derating above 150 °C |
| Reverse Leakage (IR) | 10 µA @ VR = 55 V - ensures minimal standby current in high-impedance sensing paths |
Pinout & Package
Hermetically sealed voidless glass MELF (B-SQ) package with copper end caps, tin/lead 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 normal Zener operation |
| Cathode | Reverse breakdown terminal / high-side connection | Banded end; connects to unregulated input rail to establish regulated reference voltage at anode |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and long-term parameter drift in humid or vacuum environments |
| Category I metallurgical bond | Validated for JANTXV reliability level per MIL-PRF-19500/533, supporting 100,000-hour MTBF in flight systems |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per Microsemi MicroNote 050 - no shielding required for LEO missions |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external protection in handling and assembly |
| RoHS-compliant option | Available for commercial grade only (e3 suffix); tin-only finish compatible with lead-free reflow profiles |
Applications
| Avionics Power Sequencing | Satellite Bus Voltage Monitoring |
|---|---|
Use Scenario: Regulating auxiliary 65–70 V bus voltage in phased-array radar power distribution units. IC Role / Device Role / Timing Role: Two-terminal Zener reference providing stable threshold for comparator-based undervoltage lockout (UVLO). Use Value: Maintains ±5% regulation across −55 °C to +125 °C ambient, eliminating calibration drift in mission-critical sequencing logic. |
Use Scenario: Clamping telemetry line voltage spikes induced by solar array transients in LEO satellite platforms. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across 68 V bus to limit overshoot to ≤75 V during 50 ns edge events. Use Value: Withstands 52 A surge (8.3 ms) without degradation, preserving signal integrity in radiation-hardened CAN FD data links. |
| Military Vehicle Battery Management | Nuclear Instrumentation Calibration |
Use Scenario: Providing reference voltage for isolated ADC inputs measuring 24–72 V battery stack voltages in armored vehicle control modules. IC Role / Device Role / Timing Role: Precision shunt reference establishing known 68 V node for ratiometric scaling of high-side sense amplifiers. Use Value: 1.5 kΩ dynamic impedance ensures <±0.1 V error under 10 mA load variation, meeting MIL-STD-1275E Class III ripple rejection. |
Use Scenario: Stabilizing high-voltage bias supply for Geiger-Müller tube detectors in portable radiation survey meters. IC Role / Device Role / Timing Role: Low-noise (80 µV/√Hz) Zener reference setting detector operating voltage within ±0.5 V tolerance. Use Value: Positive +0.101 %/°C tempco allows predictable compensation in field-deployed instruments operating from −20 °C to +60 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6344US | Same electrical specs and package; TR suffix denotes tape-and-reel packaging (EIA-481-B), while bare part lacks reel logistics | No functional difference; TR variant optimized for automated SMT placement, bare part for manual prototyping or low-volume hand-soldering | Select 1N6344US/TR when sourcing for production lines requiring standard reel delivery and pick-and-place compatibility |
| SMF68A (ON Semiconductor) | Surface-mount DO-219AB package, 68 V ±5%, 1 W PD, RθJA = 125 °C/W - higher power but non-hermetic, non-military qualified | Lacks MIL-PRF-19500/533 qualification, radiation hardness, and Category I bond - unsuitable for flight or nuclear environments | Consider SMF68A only for commercial industrial controls where cost and board space outweigh reliability and radiation requirements |
Compared with 1N6344US/TR, the bare 1N6344US offers identical performance but requires separate reel procurement, while SMF68A trades military reliability for higher power and smaller footprint - making 1N6344US/TR the sole choice for JANTXV-level avionics and space-qualified voltage references.
Availability
1N6344US/TR is available at Aetrix Electronics and suitable for avionics power sequencing, satellite bus voltage monitoring, and military vehicle battery management requiring stable component supply with full traceability and long-term obsolescence mitigation.
Supply support for 1N6344US/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 components for aerospace, defense, and industrial markets.
The 1N63xxUS series was developed to meet MIL-PRF-19500/533 requirements for hermetic, voidless-glass Zener diodes used in mission-critical voltage regulation and transient suppression where failure is not an option.
FAQ
What is the Zener voltage tolerance and test condition for 1N6344US/TR?
The 1N6344US/TR has a nominal Zener voltage of 68.0 V with ±5% tolerance, measured at IZ2 = 155 mA and TJ = 25 °C. This tolerance applies to the standard commercial version; tighter 1% (D suffix) and 2% (C suffix) variants are also available per part nomenclature.
Is 1N6344US/TR qualified to MIL-PRF-19500/533, and what reliability levels are offered?
Yes, 1N6344US/TR is qualified per MIL-PRF-19500/533 and available in JAN, JANTX, JANTXV, and JANS reliability levels. The "US" suffix indicates the MELF package and Category I metallurgical bond required for JANTXV and JANS screening, including extended life testing and lot acceptance testing.
What is the thermal resistance and derating behavior of 1N6344US/TR?
The 1N6344US/TR has RθJEC = 21 °C/W (junction-to-end-cap) and RθJA = 240 °C/W (junction-to-ambient on FR4 PCB). Power must be linearly derated above 150 °C end-cap temperature per Figure 2, reaching zero dissipation at 175 °C junction temperature.
Does 1N6344US/TR have radiation hardness, and is documentation available?
Yes, 1N6344US/TR is inherently radiation-hardened per Microsemi MicroNote 050, which documents its total ionizing dose (TID) tolerance and single-event effect (SEE) resilience. No additional hardening or screening is required for typical LEO missions up to 100 krad(Si).
What packaging format does the "TR" suffix indicate for 1N6344US/TR?
"TR" stands for tape-and-reel packaging per EIA-481-B standard, enabling automated surface-mount assembly. The device is supplied in embossed carrier tape with 2,000 units per reel, compatible with standard pick-and-place equipment used in high-volume aerospace electronics manufacturing.
1N6344US/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):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 155 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52 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
1N6344US/TR FAQ
1.How can I place an order for 1N6344US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6344US/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 1N6344US/TR reliable?
The price and inventory of 1N6344US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6344US/TR is usually 5 days.
3.What payment methods are accepted for 1N6344US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6344US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6344US/TR?
1N6344US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6344US/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 1N6344US/TR?
For technical support, including 1N6344US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6344US/TR requirements.
6.How does Aetrix verify that 1N6344US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6344US/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 1N6344US/TR meets industry standards.
7.What is the process for return or replacement of 1N6344US/TR?
All 1N6344US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6344US/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 1N6344US/TR part is unused and in its original packaging.
Return procedure for 1N6344US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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