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Microchip Technology JANS1N4970CUS/TR
- Part No.:
- JANS1N4970CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4970CUS/TR.pdf
- Description:
- DIODE ZENER 33V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,165
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Product details
Overview
JANS1N4970CUS/TR from Microsemi is a military-grade, hermetically sealed surface-mount Zener diode rated for 5 W power dissipation, with nominal Zener voltage of 33 V at 40 mA test current, ±2% tolerance (C suffix), and maximum dynamic impedance of 200 Ω at IZT - used for precision voltage regulation in high-reliability aerospace power conditioning circuits.
For engineers reviewing the JANS1N4970CUS/TR datasheet, JANS1N4970CUS/TR pinout, JANS1N4970CUS/TR application, or JANS1N4970CUS/TR equivalent, this part supports critical voltage reference and overvoltage protection functions where extended temperature operation (–65 °C to +175 °C), radiation hardness, and voidless-glass reliability are mandatory design requirements.
Technical Context
This device operates as a two-terminal voltage reference diode in reverse breakdown mode, with regulated output maintained across a wide current range (10% to 50% of IZM) and stable temperature coefficient of +0.095 %/°C. Its internal Category III metallurgical bond ensures mechanical integrity under thermal cycling and shock.
The JANS1N4970CUS/TR uses a voidless hard-glass package with tungsten slugs and copper end caps (Sn/Pb finish), enabling direct solder mounting without adhesive assistance. It complies with MIL-PRF-19500/356 for JAN-class qualification and meets ESD immunity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±2% at 40 mA - defines precise regulation point for feedback loops in DC-DC converters |
| Power Dissipation | 5 W @ TEC = 125 °C - requires heatsinking or board copper area for sustained operation above 85 °C ambient |
| Dynamic Impedance (ZZ) | 200 Ω max at IZT - limits output voltage variation under load transients in reference circuits |
| Max Reverse Leakage (IR) | 2 μA at 25.1 V - ensures minimal quiescent current draw in low-power standby modes |
| Temp Coefficient (αVZ) | +0.095 %/°C - enables predictable drift compensation in wide-temperature-range instrumentation |
| Surge Current (IZSM) | 5.0 A (8.3 ms square wave) - withstands transient overvoltage events without degradation |
| Operating Temperature | –65 °C to +175 °C - supports deployment in engine bays, space payloads, and downhole electronics |
Pinout & Package
Package: Hermetically sealed voidless hard-glass "E" package (also designated D-5B), with copper end caps (Sn/Pb finish), cathode indicated by band, weight 539 mg, tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or common return path in shunt regulator topology |
| Cathode | Zener breakdown terminal / regulated output node | Supplies stable 33 V reference to error amplifier inputs or protection comparators |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk over 20+ year service life in vacuum or humid environments |
| Category III metallurgical bond | Guarantees mechanical robustness under 1000 g shock and 20 g vibration per MIL-STD-883 |
| Triple-layer passivation | Prevents surface leakage paths and contamination-induced parameter shift during long-term storage |
| Nonsensitive to ESD | Withstands >4 kV HBM without parameter shift - eliminates need for on-board ESD protection networks |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050 - suitable for LEO satellite power subsystems |
Applications
| Aerospace Power Conditioning | Downhole Instrumentation |
|---|---|
Use Scenario: Regulating auxiliary supply rails in satellite telemetry modules exposed to thermal cycling and ionizing radiation. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 33 V bias to ADC drivers and op-amp rails. Use Value: Maintains <±0.5% output stability across –65 °C to +125 °C, ensuring data integrity without recalibration. |
Use Scenario: Overvoltage clamping in high-temperature logging tools deployed at 175 °C wellbore environments. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting analog front-end amplifiers from switching surges. Use Value: Survives 5.0 A surge (8.3 ms) while holding clamp voltage ≤36 V - prevents sensor saturation and latch-up. |
| Military Avionics Reference | Nuclear Facility Monitoring |
Use Scenario: Precision voltage reference in flight control system analog computing units requiring MIL-SPEC reliability. IC Role / Device Role / Timing Role: Primary Zener reference for dual-redundant power supply error amplifiers. Use Value: ±2% initial tolerance and +0.095 %/°C TC enable <±1.2% total error over full military temperature range. |
Use Scenario: Radiation-tolerant voltage clamp in reactor coolant monitoring sensors operating continuously at 150 °C. IC Role / Device Role / Timing Role: Fail-safe overvoltage protector for isolated signal conditioners interfacing with RTDs. Use Value: Inherent TID hardness eliminates derating or shielding - reduces BOM count and calibration overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4970CUS/TR | Same electrical specs but qualified to JANTXV level (enhanced screening, 100% lot testing) | Required for Class H avionics where burn-in and parametric lot acceptance are mandated | Select when full MIL-PRF-19500/356 JANTXV compliance - not just JANS - is contractually required |
| 1N4970US | Commercial-grade version; same Zener voltage and package but no MIL qualification or radiation data | Suitable only for non-safety-critical industrial prototypes or ground-test fixtures | Choose only for cost-sensitive development stages where radiation hardness and extended temp are not needed |
Compared with JANS1N4970CUS/TR, JANTXV1N4970CUS/TR adds screening rigor without altering regulation performance, while 1N4970US omits military qualification entirely - making JANS1N4970CUS/TR the optimal balance of assured reliability and production readiness for flight hardware.
Availability
JANS1N4970CUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, downhole instrumentation, military avionics reference, and nuclear facility monitoring requiring stable component supply with guaranteed traceability and long-term lifecycle support.
Supply support for JANS1N4970CUS/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 company specializing in high-reliability analog and mixed-signal components for defense, aerospace, and industrial markets.
The JANS1N4970CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener series, engineered specifically for mission-critical voltage regulation where hermetic sealing, radiation tolerance, and extreme temperature resilience are non-negotiable.
FAQ
What is the Zener voltage tolerance for JANS1N4970CUS/TR?
The JANS1N4970CUS/TR has a nominal Zener voltage of 33 V with ±2% tolerance, indicated by the "C" suffix in the part number. This tolerance is specified at 25 °C and 40 mA test current, and remains stable across its full operating temperature range due to its +0.095 %/°C temperature coefficient.
Does JANS1N4970CUS/TR require heatsinking in 5 W operation?
Yes - JANS1N4970CUS/TR dissipates up to 5 W at TEC = 125 °C, with thermal resistance of 10 °C/W junction-to-end-cap. To sustain full power at ambient temperatures above 85 °C, external heatsinking or ≥2 in² of 2-oz copper pour is required to maintain junction temperature below 175 °C.
Is JANS1N4970CUS/TR compatible with lead-free reflow processes?
No - JANS1N4970CUS/TR features Sn/Pb-finished copper end caps and is qualified for tin-lead soldering only. Its glass package is not rated for peak reflow temperatures exceeding 235 °C, and lead-free profiles may cause intermetallic degradation or seal failure.
What does the "JANS" prefix signify for JANS1N4970CUS/TR?
The "JANS" prefix denotes Joint Army-Navy-Space qualification per MIL-PRF-19500/356, the highest reliability tier for discrete semiconductors. JANS1N4970CUS/TR undergoes rigorous screening including temperature cycling, hermeticity testing, and lot acceptance tests - exceeding commercial or even JANTXV requirements in some categories.
Can JANS1N4970CUS/TR be used as a replacement for 1N4970US?
JANS1N4970CUS/TR shares identical electrical parameters and package with 1N4970US but adds military qualification, radiation hardness data, and enhanced screening. It is physically interchangeable, but substituting it into a commercial design requires verifying that Sn/Pb assembly and MIL-spec documentation meet program requirements.
JANS1N4970CUS/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):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 25.1 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
JANS1N4970CUS/TR FAQ
1.How can I place an order for JANS1N4970CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4970CUS/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 JANS1N4970CUS/TR reliable?
The price and inventory of JANS1N4970CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4970CUS/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4970CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4970CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N4970CUS/TR?
JANS1N4970CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4970CUS/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 JANS1N4970CUS/TR?
For technical support, including JANS1N4970CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4970CUS/TR requirements.
6.How does Aetrix verify that JANS1N4970CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4970CUS/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 JANS1N4970CUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4970CUS/TR?
All JANS1N4970CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4970CUS/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 JANS1N4970CUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4970CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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