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Microchip Technology JANS1N4975CUS/TR
- Part No.:
- JANS1N4975CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4975CUS/TR.pdf
- Description:
- DIODE ZENER 51V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,641
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Product details
Overview
JANS1N4975CUS/TR from Microsemi is a hermetically sealed, voidless-glass surface-mount Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 51 V ±2% (C suffix), dynamic impedance of 27 Ω at 25 mA test current, and operating junction temperature range of −65 °C to +175 °C. It serves as a precision voltage reference and regulation element in high-reliability military power conditioning circuits.
For engineers reviewing the JANS1N4975CUS/TR datasheet, JANS1N4975CUS/TR pinout, JANS1N4975CUS/TR application, or JANS1N4975CUS/TR equivalent, this part is selected for mission-critical voltage stabilization where radiation hardness, ESD immunity per MIL-STD-750 Method 1020, and long-term parametric stability under thermal cycling are mandatory design requirements.
Technical Context
This JANS1N4975CUS/TR belongs to the MIL-PRF-19500/356 qualified 1N4954US–1N4996US series, featuring Category I internal metallurgical bonds and triple-layer passivation. Its voidless-glass hermetic seal ensures zero moisture ingress and eliminates delamination risk under extreme thermal shock.
It operates with a forward voltage of 1.50 V at 1.0 A and exhibits a temperature coefficient of +0.095 %/°C at IZT, enabling predictable drift compensation in wide-temperature-range analog references. Thermal resistance is 7 °C/W junction-to-end-cap, supporting stable 5 W operation up to 140 °C end-cap temperature before linear derating to zero at 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 51 V ±2% at IZT = 25 mA - precise regulation point for mid-range DC rails in avionics power supplies |
| Power Dissipation | 5 W @ TEC = 140 °C - enables compact surface-mount regulation without heatsinking in constrained enclosures |
| Dynamic Impedance ZZ | 27 Ω @ IZT = 25 mA - low AC impedance ensures minimal output voltage ripple under varying load conditions |
| Max Reverse Leakage IR | 2 μA @ VR = 40.8 V - ultra-low leakage preserves accuracy in high-impedance reference nodes |
| Temp Coefficient αVZ | +0.095 %/°C @ IZT - predictable positive drift allows matched-component temperature compensation |
| Surge Current IZSM | 3.0 A @ 8.3 ms square wave - withstands transient overvoltage events in MIL-STD-1275-compliant systems |
| Junction Temp Range | −65 °C to +175 °C - supports operation in space-grade and jet-engine-mounted electronics |
Pinout & Package
Package: Hermetically sealed voidless hard glass case with tungsten slugs; end caps are copper with Sn/Pb finish; polarity indicated by cathode band; marking not applied; weight 539 mg; tape-and-reel compliant with EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries full regulator current during clamping |
| Cathode | Zener breakdown terminal | Banded end; connected to higher-potential rail; defines regulated output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture-induced parameter shift and corrosion failure modes in 100% RH or vacuum environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycle reliability exceeding 1000 cycles between −65 °C and +175 °C |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands human-body-model discharges ≥15 kV without parameter degradation or catastrophic failure |
| Inherent radiation hardness | Qualified per MicroNote 050 for total ionizing dose (TID) tolerance >100 krad(Si), suitable for LEO/SME missions |
| Triple-layer passivation | Prevents surface conduction paths and leakage current increase under high humidity or contamination exposure |
Applications
| Aerospace Power Regulation | Missile Guidance Reference |
|---|---|
Use Scenario: Stabilized 51 V reference in DC-DC converter feedback loops for satellite bus power distribution. IC Role / Device Role / Timing Role: Zener voltage reference providing setpoint accuracy for error amplifiers in isolated flyback controllers. Use Value: ±2% tolerance and +0.095%/°C TC enable <±0.5% output voltage drift across −55 °C to +125 °C operational range. |
Use Scenario: Precision biasing of op-amp input stages in inertial measurement unit (IMU) signal conditioning. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference for analog front-end gain calibration. Use Value: 2 μA max reverse leakage at 40.8 V prevents loading errors in high-impedance sensor interface networks. |
| Nuclear Instrumentation | Tactical Radios |
Use Scenario: High-stability reference in gamma-ray spectrometer pulse-height analyzers requiring long-term calibration retention. IC Role / Device Role / Timing Role: Primary voltage standard for ADC reference divider networks in radiation-hardened data acquisition modules. Use Value: Voidless-glass construction and Category I bonding ensure no parametric drift after 100 krad(Si) TID exposure. |
Use Scenario: Overvoltage protection clamp on 28 V vehicle power inputs in manpack radios subjected to MIL-STD-1275B transients. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 3.0 A surge pulses without degradation. Use Value: 5 W rating and 7 °C/W thermal resistance sustain repeated 8.3 ms surges without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4975CUS/TR | Same electrical specs and package; qualified to JANTXV level (lower screening rigor than JANS) | Lacks full JANS-level radiation hardness verification and extended life testing | Select when radiation tolerance is secondary to cost and lead time in ground-based military systems |
| 1N4975CUS/TR | Commercial-grade version; identical Zener voltage, impedance, and thermal specs but no MIL-PRF-19500 qualification | Not screened for high-reliability environmental stress; unsuitable for flight or nuclear environments | Use only in non-safety-critical industrial prototypes where full military qualification is unnecessary |
Compared with JANS1N4975CUS/TR, JANTXV1N4975CUS/TR offers reduced screening depth but retains identical thermal and electrical behavior for most ground-platform applications, while 1N4975CUS/TR provides identical performance at commercial reliability levels-neither is pin-compatible with axial-leaded variants due to differing package geometry and thermal path.
Availability
JANS1N4975CUS/TR is available at Aetrix Electronics and suitable for aerospace power regulation, missile guidance reference, and nuclear instrumentation requiring stable component supply with guaranteed traceability and long-term obsolescence management.
Supply support for JANS1N4975CUS/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 components for defense, aerospace, and industrial markets, with emphasis on radiation-hardened and hermetically sealed devices.
The JANS1N4975CUS/TR belongs to Microsemi's MIL-PRF-19500/356 qualified Zener series, engineered specifically for voltage reference and regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance for JANS1N4975CUS/TR?
The JANS1N4975CUS/TR has a nominal Zener voltage of 51 V with ±2% tolerance, indicated by the "C" suffix in the part number. This tolerance is specified at 25 °C and IZT = 25 mA, and remains stable across its full operating temperature range due to its Category I metallurgical bond and triple-layer passivation.
Does JANS1N4975CUS/TR require heatsinking in 5 W operation?
JANS1N4975CUS/TR is rated for 5 W dissipation at an end-cap temperature of 140 °C, with a junction-to-end-cap thermal resistance of 7 °C/W. In typical PCB layouts with adequate copper area, no external heatsink is required-but thermal derating must be applied linearly above 140 °C to zero at 175 °C.
Is JANS1N4975CUS/TR radiation-hardened?
Yes, JANS1N4975CUS/TR is inherently radiation-hardened per Microsemi MicroNote 050, with verified tolerance to total ionizing dose (TID) exceeding 100 krad(Si). This capability stems from its voidless-glass hermetic seal and internal metallurgical structure, making it suitable for low-Earth orbit and tactical nuclear environments.
What is the maximum reverse leakage current for JANS1N4975CUS/TR?
The maximum reverse leakage current for JANS1N4975CUS/TR is 2 μA at VR = 40.8 V and 25 °C. This ultra-low leakage is critical for maintaining accuracy in high-impedance reference circuits and is preserved across temperature due to triple-layer passivation and hermetic sealing.
Can JANS1N4975CUS/TR replace axial-leaded 1N4975 in existing designs?
No-JANS1N4975CUS/TR uses a surface-mount "E" (D-5B) glass package with tungsten slugs and end-cap terminations, whereas axial-leaded 1N4975 uses a DO-41 package with wire leads. The thermal path, mounting method, and PCB footprint differ fundamentally; redesign is required for substitution.
JANS1N4975CUS/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):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 27 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 38.8 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
JANS1N4975CUS/TR FAQ
1.How can I place an order for JANS1N4975CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4975CUS/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 JANS1N4975CUS/TR reliable?
The price and inventory of JANS1N4975CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4975CUS/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4975CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4975CUS/TR transactions.
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4.How is shipping managed for JANS1N4975CUS/TR?
JANS1N4975CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4975CUS/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 JANS1N4975CUS/TR?
For technical support, including JANS1N4975CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4975CUS/TR requirements.
6.How does Aetrix verify that JANS1N4975CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4975CUS/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 JANS1N4975CUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4975CUS/TR?
All JANS1N4975CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4975CUS/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 JANS1N4975CUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4975CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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