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Microchip Technology JANS1N4968CUS/TR
- Part No.:
- JANS1N4968CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4968CUS/TR.pdf
- Description:
- DIODE ZENER 27V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,959
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Product details
Overview
JANS1N4968CUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation, with a nominal Zener voltage of 27 V at 50 mA test current, ±1% tolerance (C suffix), and operating junction temperature range of −65 °C to +175 °C. It serves as a precision voltage reference or regulator in high-reliability aerospace, defense, and downhole instrumentation systems where failure is unacceptable.
For engineers reviewing the JANS1N4968CUS/TR datasheet, JANS1N4968CUS/TR pinout, JANS1N4968CUS/TR application, or JANS1N4968CUS/TR equivalent, key selection criteria include its voidless-glass hermetic package, Category III metallurgical bond, radiation-hardened construction per MicroNote 050, and compliance with MIL-PRF-19500/356 for JAN/JANS qualification.
Technical Context
This device operates in reverse breakdown mode with tightly controlled dynamic impedance (6.0 Ω at IZT = 50 mA) and low temperature coefficient (+0.090 %/°C), enabling stable regulation across wide thermal excursions. Its 1.5 V forward voltage at 1.0 A supports bidirectional clamping verification during functional test.
The JANS1N4968CUS/TR uses an "E" (D-5B) package with tungsten slugs and copper end caps finished in Sn/Pb, delivering 10 °C/W junction-to-end-cap thermal resistance and 3.0 °C/W thermal impedance at 10 ms - critical for transient surge handling up to 6.0 A (8.3 ms square wave).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 27 V ±1% at IZT = 50 mA - enables precise 27 V rail regulation with minimal drift under load variation |
| Power Dissipation | 5 W @ TEC = 125 °C - requires heatsinking or board copper area to sustain full power at elevated ambient |
| Dynamic Impedance ZZ | 6.0 Ω at IZT - ensures <162 mV output change over 25–50 mA current swing (ΔVZ spec) |
| Max Reverse Leakage | 2 μA at VR = 20.6 V - guarantees low standby current in battery-backed or ultra-low-power hold-up circuits |
| Temp Coefficient αVZ | +0.090 %/°C - contributes ≤±1.5% VZ shift over −55 °C to +125 °C operating range |
| Surge Current IZSM | 6.0 A (8.3 ms square wave) - withstands lightning-induced transients without degradation |
| Forward Voltage VF | 1.50 V at 1.0 A - allows safe forward-bias verification and bidirectional ESD protection integration |
Pinout & Package
The JANS1N4968CUS/TR is housed in the "E" package (also designated D-5B), a hermetically sealed voidless glass surface-mount outline with two axial end-cap terminals. The cathode is marked by a band on the glass body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener knee reference | Connected to lower-potential node; used for forward-voltage validation and low-current biasing |
| Cathode | Regulated output terminal / Zener breakdown node | Connected to regulated rail; polarity band identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration, ensuring >20-year reliability in vacuum or corrosive environments |
| Category III metallurgical bond | Provides mechanical robustness against thermal cycling shock (−65 °C to +175 °C) and vibration in launch-critical systems |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands >8 kV HBM without parameter shift - simplifies handling and eliminates need for ESD-safe assembly protocols |
| Radiation hardness (MicroNote 050) | Qualified for total ionizing dose (TID) >100 krad(Si) - suitable for satellite power regulation and nuclear instrumentation |
| JANS qualification per MIL-PRF-19500/356 | Meets screening, testing, and traceability requirements for Class S (space-level) applications with full lot traceability |
Applications
| Aerospace Power Regulation | Downhole Sensor Reference |
|---|---|
Use Scenario: Regulating 27 V bus in satellite payload power distribution units exposed to thermal vacuum and radiation. IC Role / Device Role / Timing Role: Precision Zener reference diode providing stable 27 V reference for DC-DC converter feedback and telemetry conditioning. Use Value: Maintains ±1.5% output stability over −55 °C to +125 °C and survives >100 krad(Si) TID - eliminating recalibration cycles. |
Use Scenario: Providing voltage reference for pressure/temperature sensor signal conditioning in oil-well logging tools operating at 175 °C. IC Role / Device Role / Timing Role: High-temperature-stable Zener regulator establishing bias point for analog front-end amplifiers and ADC drivers. Use Value: Operates continuously at +175 °C junction temperature with <2 μA leakage at 20.6 V - preserving measurement accuracy in extreme downhole conditions. |
| Military Avionics Hold-Up | Nuclear Instrumentation Clamping |
Use Scenario: Back-up voltage clamp in flight control computer power supplies subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 6.0 A (8.3 ms) surges while maintaining 27 V regulation during brownout recovery. Use Value: Withstands repetitive 6 A surges without parameter shift due to triple-layer passivation and hermetic glass construction. |
Use Scenario: Radiation-tolerant overvoltage clamp protecting FPGA I/O banks in reactor monitoring systems. IC Role / Device Role / Timing Role: Bidirectional protection element leveraging 1.5 V forward drop and 27 V reverse breakdown in parallel with I/O pins. Use Value: Radiation-hardened structure prevents parametric drift after neutron/gamma exposure - ensuring long-term fault coverage integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4968CUS/TR | Same electrical specs and package, but qualified to JANTXV level (lower screening rigor than JANS); no radiation hardness documentation | Suitable for non-space avionics where TID tolerance is not required | Select when cost sensitivity outweighs space qualification needs and radiation immunity is not mandated |
| 1N4968CUS/TR | Commercial-grade version; identical Zener parameters but lacks MIL-PRF-19500/356 screening, hermeticity verification, and radiation data | Applicable only in benign industrial environments with no thermal cycling, radiation, or long-life requirements | Choose only for prototyping or non-critical subsystems where full JANS traceability and screening are unnecessary |
Compared with JANS1N4968CUS/TR, JANTXV1N4968CUS/TR offers reduced cost and lead time but omits radiation hardness validation and full Class S screening, while 1N4968CUS/TR removes all military qualification - making both unsuitable for spaceflight or nuclear instrumentation despite matching nominal VZ and power rating.
Availability
JANS1N4968CUS/TR is available at Aetrix Electronics and suitable for aerospace power regulation, downhole sensor reference, and military avionics hold-up requiring stable component supply across extended temperature and radiation environments.
Supply support for JANS1N4968CUS/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, emphasizing radiation tolerance, extended temperature operation, and long-lifecycle support.
The JANS1N4968CUS/TR belongs to Microsemi's military-qualified Zener diode family built for fail-safe voltage regulation in mission-critical systems - engineered specifically for environments demanding hermetic sealing, extreme thermal resilience, and verified radiation hardness.
FAQ
What is the Zener voltage tolerance for JANS1N4968CUS/TR?
The JANS1N4968CUS/TR has a nominal Zener voltage of 27 V with ±1% tolerance, indicated by the "C" suffix in the part number. This tight tolerance is achieved through post-trim screening and is guaranteed over the full −65 °C to +175 °C operating junction temperature range, as verified per MIL-PRF-19500/356 test requirements.
Does JANS1N4968CUS/TR require derating above 125 °C case temperature?
Yes - JANS1N4968CUS/TR must be linearly derated from 5 W at TEC = 125 °C to zero at 175 °C. For example, at 150 °C end-cap temperature, maximum allowable power drops to 3.33 W. Derating is mandatory to prevent thermal runaway and ensure compliance with MIL-PRF-19500/356 thermal stress limits.
Is JANS1N4968CUS/TR compatible with lead-free solder reflow profiles?
No - JANS1N4968CUS/TR features Sn/Pb finish on copper end caps and is qualified only for eutectic tin-lead soldering. Lead-free reflow exceeds its thermal endurance limit and risks compromising the hermetic seal or metallurgical bond integrity. Use only with Sn63/Pb37 or equivalent Pb-containing processes.
What does the "JANS" prefix signify for JANS1N4968CUS/TR?
The "JANS" prefix certifies that JANS1N4968CUS/TR meets the highest level of MIL-PRF-19500/356 qualification - including extended environmental screening, radiation hardness validation per MicroNote 050, full lot traceability, and Class S (space-level) reliability assurance. It is intended for systems where single-point failure is unacceptable.
Can JANS1N4968CUS/TR be used in forward conduction mode?
Yes - JANS1N4968CUS/TR specifies a maximum forward voltage of 1.50 V at 1.0 A, enabling use in forward-bias verification, bidirectional clamping, or low-current rectification. However, its primary design function remains reverse-bias Zener regulation; forward operation is limited to test or auxiliary protection roles.
JANS1N4968CUS/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:
- ±2%
- 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:
- Military
- Qualification:
- MIL-PRF-19500/356
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- E-MELF
JANS1N4968CUS/TR FAQ
1.How can I place an order for JANS1N4968CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4968CUS/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 JANS1N4968CUS/TR reliable?
The price and inventory of JANS1N4968CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4968CUS/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4968CUS/TR?
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4.How is shipping managed for JANS1N4968CUS/TR?
JANS1N4968CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4968CUS/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 JANS1N4968CUS/TR?
For technical support, including JANS1N4968CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4968CUS/TR requirements.
6.How does Aetrix verify that JANS1N4968CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4968CUS/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 JANS1N4968CUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4968CUS/TR?
All JANS1N4968CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4968CUS/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 JANS1N4968CUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4968CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANS1N4968CUS/TR Tags
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