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Microchip Technology 1N4989CUS/TR
- Part No.:
- 1N4989CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N4989CUS/TR.pdf
- Description:
- DIODE ZENER 200V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:80
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Product details
Overview
1N4989US/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 200 V ±5%, dynamic impedance of 500 Ω at IZT = 5 mA, and maximum reverse leakage current of 2 μA at VR = 152 V. It serves as a precision voltage reference or overvoltage clamp in high-reliability aerospace power conditioning circuits.
For engineers reviewing the 1N4989US/TR datasheet, 1N4989US/TR pinout, 1N4989US/TR application, or 1N4989US/TR equivalent, key selection criteria include its military-grade hermetic glass package (E/D-5B), -65 °C to +175 °C operating temperature range, radiation-hardened construction per MicroNote 050, and Category III internal metallurgical bond - critical for mission-critical analog regulation where field failure is unacceptable.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across wide current (10%–50% of IZM) and temperature (-65 °C to +175 °C) ranges. Its voidless-glass hermetic seal and triple-layer passivation ensure long-term stability under thermal cycling and humidity stress.
The 1N4989US/TR uses a tungsten slug-based E-package (D-5B) with copper end caps and Sn/Pb termination, enabling direct solder attachment without adhesive. Its 200 V Zener voltage and 0.110 %/°C temperature coefficient are specified at IZT = 5 mA, with surge capability up to 1850 A for 8.3 ms square wave.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 200 V ±5% at IZT = 5 mA - defines stable regulation point for high-voltage biasing or clamping |
| Power Dissipation | 5 W @ TEC = 125 °C - requires heatsinking via end-cap mounting for continuous operation |
| Dynamic Impedance (ZZ) | 500 Ω @ IZT = 5 mA - limits regulation error under load transients |
| Reverse Leakage (IR) | 2 μA max @ VR = 152 V - ensures minimal standby current in high-impedance sensing paths |
| Temp. Coefficient (αVZ) | +0.110 %/°C - enables predictable drift compensation in wide-temperature environments |
| Surge Current (IZSM) | 1850 A @ 8.3 ms - withstands lightning-induced transients in avionics power rails |
| Forward Voltage (VF) | 1.50 V @ 1.0 A - supports use as polarity-sensitive rectifier in low-current auxiliary paths |
Pinout & Package
Hermetically sealed voidless glass E-package ("D-5B") with two axial end-cap terminals: cathode marked by band, anode unmarked. Mounts directly to PCB pads with optional center adhesive spot (0.080″ dia) per package drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Breakdown terminal | Connected to regulated output node; reverse-biased during Zener operation |
| Anode (unmarked end) | Reference terminal | Connected to ground or lower-potential rail; establishes reference for voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion over 20+ year service life in sealed enclosures |
| Category III metallurgical bond | Ensures mechanical integrity under shock/vibration >100 g in flight control systems |
| MIL-PRF-19500/356 qualification | Validated for JAN/JANTXV grades - meets screening, testing, and traceability requirements for defense programs |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates handling precautions during board assembly in cleanroom or field depot environments |
| Inherent radiation hardness | Operates without parameter shift up to 100 krad(Si) - suitable for low-earth orbit satellite power supplies |
Applications
| Aerospace Power Bus Protection | High-Voltage Reference Generation |
|---|---|
|
Use Scenario: Clamping transient spikes on 200 V DC distribution buses in satellite power management units. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit bus voltage to ≤210 V during lightning-induced surges. Use Value: 1850 A surge rating and hermetic seal prevent catastrophic failure during launch-phase EMI events. |
Use Scenario: Providing stable 200 V reference for ADC biasing in radiation-tolerant telemetry converters. IC Role / Device Role / Timing Role: Precision voltage reference source with <±5% tolerance and +0.110 %/°C TC for calibration stability. Use Value: Low 2 μA leakage at 152 V ensures minimal loading on high-impedance reference dividers. |
| Avionics Overvoltage Detection | Military Radar Bias Supply Regulation |
|
Use Scenario: Triggering shutdown logic when aircraft 270 V DC bus exceeds safe threshold during generator fault. IC Role / Device Role / Timing Role: Voltage-sensing element feeding comparator input; conducts above 200 V to assert fault signal. Use Value: Sharp knee at 5 mA test current enables repeatable trip-point setting across temperature extremes. |
Use Scenario: Regulating gate drive voltage for GaN HEMTs in pulsed radar transmitter modules. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 200 V bias despite load-step variations in RF amplifier stages. Use Value: 500 Ω dynamic impedance minimizes output droop during 10–90% load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4989US (bulk) | Identical electrical specs and package; differs only in packaging format (tape-and-reel vs. bulk) | No functional difference; tape-and-reel enables automated SMT placement | Select 1N4989US/TR for high-volume production lines requiring pick-and-place compatibility |
| 1N4989 (axial-leaded) | Same Zener voltage and power rating but TO-204AA (DO-4) axial package; no hermetic glass seal | Suitable for lab prototypes or non-mission-critical industrial use; not qualified to MIL-PRF-19500/356 | Choose 1N4989US/TR when hermeticity, radiation hardness, or military screening are mandatory |
Compared with 1N4989US (bulk) and 1N4989 (axial), the 1N4989US/TR provides identical regulation performance while enabling automated assembly and retaining full MIL-spec compliance - making it the sole choice for production deployment in space-qualified or flight-critical hardware.
Availability
1N4989US/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, avionics overvoltage detection, and military radar bias supply regulation requiring stable component supply across extended product lifecycles.
Supply support for 1N4989US/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.
The 1N4989US/TR belongs to Microsemi's military-qualified Zener diode family engineered for extreme-environment voltage regulation - emphasizing hermetic sealing, radiation tolerance, and MIL-PRF-19500/356 conformance.
FAQ
What is the Zener voltage tolerance for 1N4989US/TR?
The 1N4989US/TR has a nominal Zener voltage of 200 V with a standard tolerance of ±5%, as defined in the Microsemi SD44A datasheet. No suffix indicates this standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require different part number suffixes (C or D) not present in 1N4989US/TR.
Does 1N4989US/TR meet MIL-PRF-19500/356 specifications?
Yes, the 1N4989US/TR is qualified to MIL-PRF-19500/356 as a JANTXV-grade device. This includes rigorous screening for temperature cycling, hermeticity, burn-in, and parametric testing - confirmed in the official Microsemi SD44A revision E datasheet.
What is the maximum continuous Zener current (IZM) for 1N4989US/TR?
The maximum continuous Zener current for 1N4989US/TR is 500 mA, calculated from its 5 W power rating and 200 V Zener voltage (IZM = PZ/VZ). This value is validated at TEC = 125 °C and derates linearly to zero at 175 °C per the datasheet's thermal derating curve.
Is 1N4989US/TR radiation-hardened?
Yes, the 1N4989US/TR exhibits inherent radiation hardness as documented in Microsemi MicroNote 050. It maintains electrical functionality up to 100 krad(Si) total ionizing dose - a key requirement for satellite power systems and nuclear instrumentation applications.
What package type does 1N4989US/TR use?
The 1N4989US/TR uses the E-package (also designated D-5B), a hermetically sealed voidless glass surface-mount outline with tungsten slugs and copper end caps finished in Sn/Pb. Its dimensions and pad layout are specified in the SD44A datasheet page 4.
1N4989CUS/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):
- 200 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 500 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 152 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
1N4989CUS/TR FAQ
1.How can I place an order for 1N4989CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4989CUS/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 1N4989CUS/TR reliable?
The price and inventory of 1N4989CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4989CUS/TR is usually 5 days.
3.What payment methods are accepted for 1N4989CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4989CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4989CUS/TR?
1N4989CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4989CUS/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 1N4989CUS/TR?
For technical support, including 1N4989CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4989CUS/TR requirements.
6.How does Aetrix verify that 1N4989CUS/TR is sourced from the original manufacturer or authorized distributors?
All 1N4989CUS/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 1N4989CUS/TR meets industry standards.
7.What is the process for return or replacement of 1N4989CUS/TR?
All 1N4989CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4989CUS/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 1N4989CUS/TR part is unused and in its original packaging.
Return procedure for 1N4989CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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