My Inquiry
My Account
Microchip Technology JANS1N4974CUS/TR
- Part No.:
- JANS1N4974CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
JANS1N4974CUS/TR.pdf
- Description:
- DIODE ZENER 47V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,085
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
JANS1N4974CUS/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 47 V ±1% (C suffix), dynamic impedance of 25 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 JANS1N4974CUS/TR datasheet, JANS1N4974CUS/TR pinout, JANS1N4974CUS/TR application, or JANS1N4974CUS/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, Category I metallurgical bond construction, radiation-hardened behavior per MicroNote 050, and EIA-481-B tape-and-reel packaging compatibility.
Technical Context
This device operates in reverse-biased breakdown mode with tightly controlled voltage regulation across 10–50% of maximum Zener current (IZM = 100 mA), exhibiting ΔVZ ≤ 3.5 V over that range. Its thermal resistance is 7 °C/W (junction-to-end-cap), enabling stable operation under sustained 5 W dissipation when mounted on thermally optimized substrates.
The JANS1N4974CUS/TR uses a tungsten slug-based "E" package (D-5B) with copper end caps and Sn/Pb finish, cathode polarity marked by band, and zero forward voltage marking. It complies with MIL-STD-750 Method 1020 for ESD insensitivity and supports surge currents up to 5.5 A (8.3 ms square wave).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V ±1% at 25 mA - enables precise 47 V reference generation with minimal tolerance-induced drift in feedback loops. |
| Power Dissipation (PZ) | 5 W @ TEC = 140 °C - supports continuous regulation in compact, high-temperature environments without derating below 140 °C. |
| Dynamic Impedance (ZZT) | 25 Ω @ IZT = 25 mA - ensures low output impedance for stable regulation under varying load conditions. |
| Max Reverse Leakage (IR) | 2 μA @ VR = 35.8 V - guarantees negligible parasitic current draw in standby or high-impedance sensing paths. |
| Temp Coefficient (αVZ) | ±0.095 %/°C @ IZT - provides predictable, linear voltage drift over full –65 °C to +175 °C operating range. |
| Surge Current (IZSM) | 5.5 A @ 8.3 ms - withstands transient overvoltage events common in avionics and radar power rails. |
| Forward Voltage (VF) | 1.5 V @ 1.0 A - defines conduction threshold during fault conditions or bidirectional clamp configurations. |
Pinout & Package
Package: Hermetically sealed voidless glass "E" package (JEDEC D-5B), with tungsten slugs, copper end caps, Sn/Pb finish, and cathode band marking. Weight: 539 mg. Tape-and-reel compliant per EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to ground or lower-potential node in shunt regulator configuration; carries full load current during regulation. |
| Cathode | Zener breakdown terminal / high-side connection | Connected to unregulated input rail; maintains stable 47 V reference relative to anode under reverse bias. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates internal moisture and particle migration, ensuring long-term parameter stability in vacuum or high-humidity environments. |
| Category I metallurgical bond | Provides mechanical integrity and thermal continuity between die and slug, supporting reliable 5 W operation at 175 °C junction temperature. |
| Triple-layer passivation | Prevents surface leakage and contamination-induced parameter shift, critical for space-grade and nuclear-hardened applications. |
| MIL-PRF-19500/356 qualification (JANS) | Validates performance across extended temperature, shock, vibration, and burn-in screening required for Class S spaceflight components. |
| Radiation hardness (per MicroNote 050) | Enables operation in total ionizing dose (TID) environments exceeding 100 krad(Si), suitable for satellite power subsystems. |
Applications
| Aerospace Power Bus Regulation | Tactical Radio Transceiver Biasing |
|---|---|
Use Scenario: Stabilizing 47 V supply rail for RF power amplifier stages in airborne communication systems exposed to wide thermal cycling and vibration. IC Role / Device Role / Timing Role: Shunt voltage regulator providing precise 47 V reference to GaN HEMT gate drivers and bias networks. Use Value: Maintains amplifier linearity and efficiency across –55 °C to +125 °C ambient via low αVZ and robust thermal resistance. |
Use Scenario: Generating stable local bias for mixer and oscillator ICs in handheld manpack radios operating in desert and arctic conditions. IC Role / Device Role / Timing Role: Precision Zener reference source for analog front-end voltage-controlled oscillators and AGC loops. Use Value: Delivers <2 μA leakage and <25 Ω dynamic impedance to minimize phase noise degradation and gain drift. |
| Nuclear Instrumentation Signal Conditioning | Satellite Payload Voltage Reference |
Use Scenario: Calibrating high-voltage detector outputs in radiation monitoring equipment deployed in reactor containment zones. IC Role / Device Role / Timing Role: Primary voltage standard in multi-decade scaling networks for pulse-height analysis ADCs. Use Value: Guarantees ±1% initial accuracy and radiation-hardened stability up to 100 krad(Si), eliminating recalibration cycles. |
Use Scenario: Providing primary reference for DC-DC converter feedback in LEO satellite power management units. IC Role / Device Role / Timing Role: Shunt-regulated reference node for isolated error amplifiers controlling 28 V bus converters. Use Value: Survives launch vibration and maintains regulation integrity during eclipse-phase thermal transients without parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JANTXV1N4974CUS/TR | Same electrical specs and package, but qualified to JANTXV level (lower screening rigor than JANS); no radiation hardness documentation. | Approved for non-space military platforms where TID exposure is not expected; unsuitable for orbital missions. | Select JANTXV1N4974CUS/TR only when full JANS radiation assurance and Class S screening are unnecessary. |
| 1N4974CUS/TR | Commercial-grade version; identical Zener parameters but lacks MIL-PRF-19500 qualification, radiation data, and extended temperature validation. | Limited to industrial or commercial avionics where environmental stress and lifetime reliability requirements are less stringent. | Choose 1N4974CUS/TR for cost-sensitive prototyping or non-mission-critical subsystems with controlled thermal profiles. |
Compared with JANS1N4974CUS/TR, JANTXV1N4974CUS/TR offers identical regulation performance with reduced screening overhead, while 1N4974CUS/TR sacrifices military qualification and radiation assurance for lower unit cost and broader commercial availability.
Availability
JANS1N4974CUS/TR is available at Aetrix Electronics and suitable for aerospace power regulation, tactical radio biasing, nuclear instrumentation calibration, and satellite payload voltage referencing requiring stable component supply across extended temperature and radiation environments.
Supply support for JANS1N4974CUS/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 JANS1N4974CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356 qualified Zener series, engineered specifically for mission-critical voltage regulation where failure is not an option - including spaceflight, nuclear instrumentation, and strategic communications.
FAQ
What is the Zener voltage tolerance of JANS1N4974CUS/TR?
JANS1N4974CUS/TR has a Zener voltage tolerance of ±1%, indicated by the "C" suffix in the part number. This corresponds to a nominal 47 V rating with a guaranteed range of 46.53 V to 47.47 V at 25 °C and 25 mA test current, as verified in the SD44A datasheet Table on Page 2.
Is JANS1N4974CUS/TR suitable for space applications?
Yes, JANS1N4974CUS/TR is qualified to MIL-PRF-19500/356 Class S and documented as inherently radiation hard per Microsemi MicroNote 050, supporting total ionizing dose (TID) levels exceeding 100 krad(Si). Its voidless-glass hermetic seal and Category I metallurgical bond make JANS1N4974CUS/TR appropriate for LEO and GEO satellite power subsystems.
What is the maximum continuous Zener current for JANS1N4974CUS/TR?
The maximum continuous Zener current (IZM) for JANS1N4974CUS/TR is 100 mA, derived from its 5 W power rating and 47 V nominal Zener voltage (P = V × I). This value is confirmed in the Electrical Characteristics table on Page 2 of the SD44A datasheet under the "MAXIMUM CONTINUOUS CURRENT IZM" column for the 1N4974US row.
Does JANS1N4974CUS/TR have a cathode band marking?
Yes, JANS1N4974CUS/TR uses a visible cathode band to indicate polarity, as stated in the Mechanical and Packaging section: "POLARITY: Cathode indicated by band." This marking is essential for correct orientation during automated placement and manual inspection in high-reliability assembly processes.
What is the thermal resistance specification for JANS1N4974CUS/TR?
JANS1N4974CUS/TR has a thermal resistance of 7 °C/W junction-to-end-cap, applicable to the 1N4954US–1N4996US family per the Maximum Ratings table on Page 1 of the SD44A datasheet. This value enables accurate thermal modeling when designing heatsinking for sustained 5 W operation at elevated ambient temperatures.
JANS1N4974CUS/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):
- 47 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 35.8 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
JANS1N4974CUS/TR FAQ
1.How can I place an order for JANS1N4974CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JANS1N4974CUS/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 JANS1N4974CUS/TR reliable?
The price and inventory of JANS1N4974CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JANS1N4974CUS/TR is usually 5 days.
3.What payment methods are accepted for JANS1N4974CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JANS1N4974CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JANS1N4974CUS/TR?
JANS1N4974CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JANS1N4974CUS/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 JANS1N4974CUS/TR?
For technical support, including JANS1N4974CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JANS1N4974CUS/TR requirements.
6.How does Aetrix verify that JANS1N4974CUS/TR is sourced from the original manufacturer or authorized distributors?
All JANS1N4974CUS/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 JANS1N4974CUS/TR meets industry standards.
7.What is the process for return or replacement of JANS1N4974CUS/TR?
All JANS1N4974CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with JANS1N4974CUS/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 JANS1N4974CUS/TR part is unused and in its original packaging.
Return procedure for JANS1N4974CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
JANS1N4974CUS/TR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
