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Microchip Technology 1N4968US/TR
- Part No.:
- 1N4968US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N4968US/TR.pdf
- Description:
- DIODE ZENER 27V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:91
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Product details
Overview
1N4968US/TR from Microsemi is a surface-mount, voidless-hermetically-sealed glass Zener diode rated for 5 W power dissipation at TEC = 125 °C, with nominal Zener voltage of 27 V at 50 mA test current, ±5% tolerance, and dynamic impedance of 6.0 Ω - used in high-reliability voltage regulation and reference circuits for aerospace, defense, and industrial control systems.
For engineers reviewing the 1N4968US/TR datasheet, 1N4968US/TR pinout, 1N4968US/TR application, or 1N4968US/TR equivalent, this part delivers military-grade stability across –65 °C to +175 °C, low temperature coefficient (±0.090 %/°C), robust ESD immunity per MIL-STD-750 Method 1020, and radiation-hardened construction per MicroNote 050.
Technical Context
This Zener operates in reverse breakdown with tightly controlled VZ = 27 V ±5% at IZT = 50 mA, exhibiting low dynamic impedance (ZZ = 6.0 Ω) and minimal voltage regulation drift (ΔVZ ≤ 0.5 V between 10% and 50% of IZM). Its hermetic glass package uses internal Category III metallurgical bonds for long-term reliability under thermal cycling.
The device supports continuous operation up to 175 °C junction temperature, with thermal resistance of 10 °C/W (junction-to-end-cap), and withstands 8.3 ms surge currents up to 6.0 A. Reverse leakage remains ≤2 μA at 20.6 V, and forward voltage is specified at 1.50 V @ 1.0 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V ±5% at 50 mA - defines stable regulation point for precision reference designs |
| Power Dissipation | 5 W @ TEC = 125 °C - enables high-power regulation without external heatsinking in compact layouts |
| Dynamic Impedance (ZZ) | 6.0 Ω @ IZT = 50 mA - ensures minimal output voltage variation under load transients |
| Temp. Coefficient (αVZ) | ±0.090 %/°C - guarantees predictable voltage drift over wide operating temperature range |
| Max. Reverse Leakage (IR) | 2 μA @ 20.6 V - maintains low quiescent current in standby or battery-backed circuits |
| Surge Current (IZSM) | 6.0 A @ 8.3 ms - withstands transient overvoltage events without degradation |
| Junction Temp. Range | –65 °C to +175 °C - supports operation in extreme environments including downhole and avionics |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs, "E" package (also known as "D-5B"), surface-mount configuration with copper end caps and Sn/Pb finish. Cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Reverse-biased Zener terminal / regulated output node | Provides stable 27 V reference when biased above breakdown; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and long-term parameter drift in harsh environments |
| Category III metallurgical bond | Ensures mechanical integrity and thermal cycle survivability per MIL-PRF-19500/356 |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for external ESD protection |
| Inherent radiation hardness | Validated per Microsemi MicroNote 050 - suitable for space and nuclear applications |
| Tape-and-reel packaging | EIA-481-B compliant - enables automated SMT assembly without manual handling |
Applications
| Aerospace Power Conditioning | Defense System Reference |
|---|---|
Use Scenario: Regulating auxiliary supply rails in satellite power management units exposed to thermal vacuum and radiation. IC Role / Device Role / Timing Role: Primary voltage reference and overvoltage clamp in DC-DC converter feedback loops. Use Value: Maintains 27 V reference accuracy within ±5% across –65 °C to +175 °C and after 100 krad(Si) total ionizing dose exposure. |
Use Scenario: Providing stable bias voltage for RF front-end amplifiers in radar transceivers operating under shock/vibration. IC Role / Device Role / Timing Role: Precision shunt regulator for local LNA biasing and ADC reference stabilization. Use Value: Delivers <2 μA leakage at 20.6 V and 6.0 Ω dynamic impedance to minimize signal path noise coupling. |
| Industrial Control Safety Circuit | Downhole Instrumentation |
Use Scenario: Overvoltage protection and trip-point setting in SIL-2-rated emergency shutdown controllers. IC Role / Device Role / Timing Role: Fail-safe Zener clamp in redundant voltage monitoring paths. Use Value: Survives 6.0 A surge current (8.3 ms) and maintains regulation integrity after 1000 thermal cycles from –55 °C to +125 °C. |
Use Scenario: Voltage reference in high-temperature logging tools deployed at >150 °C wellbore environments. IC Role / Device Role / Timing Role: High-temperature-stable reference for sensor excitation and analog front-end calibration. Use Value: Operates continuously at 175 °C junction temperature with <0.090 %/°C tempco - enabling ±0.5% reference stability over full range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4968US | Same electrical specs and package; differs only in tape-and-reel vs. bulk packaging (no /TR suffix) | No functional difference - identical performance in PCB assembly and operation | Select 1N4968US/TR for automated pick-and-place; choose 1N4968US for hand-solder prototyping or low-volume builds |
| 1N5969US | 6.2 V Zener, 5 W rating, same D-5B package but different VZ, IZT, and tempco (±0.04 %/°C) | Used where lower-voltage regulation is required; not interchangeable without circuit redesign | Choose 1N5969US only when 6.2 V regulation is needed - not a drop-in replacement for 1N4968US/TR |
Compared with 1N4968US/TR, the 1N4968US offers identical electrical behavior but lacks tape-and-reel convenience, while 1N5969US serves distinct low-voltage applications and requires schematic and layout changes due to its 6.2 V rating and different thermal characteristics.
Availability
1N4968US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system reference, and industrial control safety circuit applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4968US/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 (now part of Microchip Technology) is a U.S.-based semiconductor manufacturer specializing in high-reliability, radiation-hardened, and military-qualified components.
The 1N4968US/TR belongs to Microsemi's legacy MIL-PRF-19500/356-qualified Zener series, designed specifically for mission-critical voltage regulation in aerospace, defense, and industrial systems demanding zero-failure tolerance.
FAQ
What is the Zener voltage tolerance for 1N4968US/TR?
The 1N4968US/TR has a nominal Zener voltage of 27 V with a standard tolerance of ±5%, as defined in the Electrical Characteristics table at IZT = 50 mA. No suffix indicates this standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes not present in this part number. The 1N4968US/TR is not rated for tighter initial tolerance.
Does 1N4968US/TR meet MIL-PRF-19500/356 requirements?
Yes, the 1N4968US/TR is qualified to MIL-PRF-19500/356 as a JAN, JANTX, JANTXV, or JANS device depending on screening level - confirmed in the official SD44A datasheet. It features Category III metallurgical bonds and voidless hermetic glass construction required for military-grade reliability certification.
What is the maximum continuous Zener current for 1N4968US/TR?
The maximum continuous Zener current (IZM) for 1N4968US/TR is 6.0 A, calculated from its 5 W power rating and 27 V Zener voltage (IZM = PZ/VZ ≈ 5 W / 27 V). This value aligns with the datasheet listing of IZM = 6.0 A at TEC = 125 °C and derates linearly to zero at 175 °C.
Is 1N4968US/TR compatible with lead-free reflow processes?
The 1N4968US/TR uses Sn/Pb (tin/lead) finish on its copper end caps, as explicitly stated in the Mechanical and Packaging section. It is not lead-free and is not qualified for Pb-free reflow profiles. For RoHS-compliant alternatives, consult Microchip's current-generation Zener offerings or contact Aetrix for qualified replacements.
What does the "/TR" suffix indicate in 1N4968US/TR?
The "/TR" suffix in 1N4968US/TR denotes tape-and-reel packaging per EIA-481-B standard, enabling automated surface-mount assembly. This is a packaging variant only - all electrical, thermal, and reliability specifications remain identical to the base 1N4968US part. The "US" denotes surface-mount "E" package; "/TR" adds reel logistics.
1N4968US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, E
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 6 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 20.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- E-MELF
1N4968US/TR FAQ
1.How can I place an order for 1N4968US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4968US/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 1N4968US/TR reliable?
The price and inventory of 1N4968US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4968US/TR is usually 5 days.
3.What payment methods are accepted for 1N4968US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4968US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4968US/TR?
1N4968US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4968US/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 1N4968US/TR?
For technical support, including 1N4968US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4968US/TR requirements.
6.How does Aetrix verify that 1N4968US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4968US/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 1N4968US/TR meets industry standards.
7.What is the process for return or replacement of 1N4968US/TR?
All 1N4968US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4968US/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 1N4968US/TR part is unused and in its original packaging.
Return procedure for 1N4968US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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