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Microchip Technology 1N4964CUS/TR
- Part No.:
- 1N4964CUS/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N4964CUS/TR.pdf
- Description:
- DIODE ZENER 18V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:232
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Product details
Overview
1N4964CUS/TR from Microsemi is a surface-mount, voidless-hermetically-sealed glass Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage of 18 V ±2% (C-suffix), dynamic impedance of 4.0 Ω at 65 mA test current, and operating junction temperature range from –65 °C to +175 °C. It serves as a precision voltage reference and regulation element in high-reliability military and aerospace power conditioning circuits.
For engineers reviewing the 1N4964CUS/TR datasheet, 1N4964CUS/TR pinout, 1N4964CUS/TR application, or 1N4964CUS/TR equivalent, this part is selected for demanding analog reference, overvoltage clamping, and bias stabilization where hermetic sealing, radiation hardness, and MIL-PRF-19500/356 qualification are mandatory.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across wide current (10–50% of IZM) and temperature ranges. Its voidless-glass construction with internal Category I metallurgical bond ensures long-term stability under thermal cycling and mechanical stress.
It exhibits low dynamic impedance (4.0 Ω @ 65 mA), minimal voltage drift (±0.085%/°C tempco), and robust surge capability (9.0 A @ 8.3 ms). Reverse leakage remains ≤5 μA at 13.7 V, supporting low-power standby regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±2% at 65 mA - precise regulation point for 15–21 V rail stabilization |
| Power Dissipation | 5 W @ TEC = 140 °C - supports continuous operation in compact, high-temp PCB layouts |
| Dynamic Impedance (ZZ) | 4.0 Ω @ IZT = 65 mA - ensures <100 mV output variation under 100 mA load transients |
| Max Reverse Leakage (IR) | 5 μA @ VR = 13.7 V - enables low-quiescent-current bias networks without significant error |
| Tempco (αVZ) | ±0.085 %/°C - maintains <±1.5% total drift over –55 °C to +125 °C ambient |
| Surge Current (IZSM) | 9.0 A @ 8.3 ms - withstands IEC 61000-4-5 Level 4 surge events without degradation |
| Junction Temp Range | –65 °C to +175 °C - qualified for extended-range avionics, downhole, and space-grade systems |
Pinout & Package
Hermetically sealed voidless glass package designated "E" (also known as "D-5B"), with copper end caps finished in Sn/Pb, 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 ground or lowest potential in shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 18 V reference when reverse-biased; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal delamination risk over 20+ year field life |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration up to 100 g, per MIL-STD-883 |
| Triple-layer passivation | Prevents surface leakage and contamination-induced parameter shift in humid environments |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift |
| Inherent radiation hardness | Qualified to 100 krad(Si) TID per MicroNote 050 - suitable for LEO satellite power systems |
Applications
| Aerospace Power Conditioning | Military Avionics Reference |
|---|---|
Use Scenario: Regulating 28 V aircraft bus-derived rails for analog sensor front-ends and ADC references. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 18 V bias to op-amps and voltage comparators. Use Value: Maintains ±0.36 V regulation accuracy over –55 °C to +125 °C ambient, meeting DO-160 Section 22 thermal requirements. |
Use Scenario: Clamping transient overvoltage on MIL-STD-1553B data bus power lines during lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response overvoltage protector absorbing 9.0 A surge pulses without latch-up. Use Value: Survives repeated 8.3 ms surges per IEC 61000-4-5 while retaining <5% VZ shift after 1000 cycles. |
| Downhole Instrumentation | Satellite Payload Biasing |
Use Scenario: Providing stable bias to pressure/temperature transducers in oil-well logging tools operating at 175 °C. IC Role / Device Role / Timing Role: High-temperature Zener reference enabling accurate signal conditioning at extreme junction temperatures. Use Value: Delivers 18 V regulation with <±2.5% total drift across full –65 °C to +175 °C range, validated per MIL-PRF-19500/356. |
Use Scenario: Generating precision 18 V reference for CMOS image sensor bias in low-Earth orbit payloads. IC Role / Device Role / Timing Role: Radiation-hardened voltage reference minimizing dark current drift in imaging arrays. Use Value: Sustains <100 ppm/krad parametric shift up to 100 krad(Si), per MicroNote 050 characterization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4964US | Same 18 V nominal rating but ±5% tolerance (no suffix); higher dynamic impedance (4.5 Ω) | Acceptable where tighter regulation not required; lower cost for non-critical biasing | Select 1N4964US if ±5% VZ tolerance and reduced surge margin are acceptable |
| 1N6634US | 3.9 V Zener, 320 mA IZT, 2.0 Ω ZZ; different voltage grade and thermal derating (125 °C TEC) | Used in low-voltage logic rail clamping; incompatible for 18 V reference replacement | Choose 1N6634US only for sub-5 V regulation needs - not a functional substitute for 1N4964CUS/TR |
Compared with 1N4964US and 1N6634US, the 1N4964CUS/TR delivers tighter voltage tolerance (±2%), superior thermal endurance (140 °C TEC vs. 125 °C), and optimized surge handling for mission-critical 18 V reference roles.
Availability
1N4964CUS/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, military avionics reference, and downhole instrumentation requiring stable component supply with guaranteed MIL-PRF-19500/356 compliance and traceable lot history.
Supply support for 1N4964CUS/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 semiconductors for defense, aerospace, and industrial markets, emphasizing radiation hardness, hermetic packaging, and military qualification.
The 1N4964CUS/TR belongs to Microsemi's legacy MIL-PRF-19500/356-qualified Zener series, engineered specifically for voltage regulation in safety-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance of the 1N4964CUS/TR?
The 1N4964CUS/TR has a nominal Zener voltage of 18 V with a tolerance of ±2%, denoted by the "C" suffix in the part number. This tight tolerance ensures predictable regulation in precision analog circuits where voltage drift must remain below ±360 mV across production lots and temperature extremes.
Does the 1N4964CUS/TR meet military specifications?
Yes, the 1N4964CUS/TR is qualified to MIL-PRF-19500/356 and offered in JAN, JANTX, JANTXV, and JANS versions. Its voidless-glass hermetic seal, Category I metallurgical bond, and triple-layer passivation satisfy the environmental and reliability requirements for Class S and Class B military applications.
What is the maximum power dissipation for the 1N4964CUS/TR at elevated temperatures?
The 1N4964CUS/TR is rated for 5 W at an end-cap temperature (TEC) of 140 °C. Power must be linearly derated above that point, reaching zero at 175 °C. This allows sustained operation in high-ambient environments such as engine-mounted avionics or downhole tool housings.
Is the 1N4964CUS/TR radiation hardened?
Yes, the 1N4964CUS/TR exhibits inherent radiation hardness, characterized per Microsemi MicroNote 050 to withstand total ionizing dose (TID) up to 100 krad(Si) with minimal parametric shift - making it suitable for use in low-Earth orbit satellite power subsystems.
What package type does the 1N4964CUS/TR use, and is it RoHS-compliant?
The 1N4964CUS/TR uses the "E" package (also known as "D-5B"), a hermetically sealed voidless glass case with copper end caps and Sn/Pb finish. It is not RoHS-compliant due to leaded terminations; however, it meets MIL-PRF-19500/356 requirements for high-reliability applications where Pb-free alternatives are not yet qualified.
1N4964CUS/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):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 4 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 13.7 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
1N4964CUS/TR FAQ
1.How can I place an order for 1N4964CUS/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4964CUS/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 1N4964CUS/TR reliable?
The price and inventory of 1N4964CUS/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4964CUS/TR is usually 5 days.
3.What payment methods are accepted for 1N4964CUS/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4964CUS/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4964CUS/TR?
1N4964CUS/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4964CUS/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 1N4964CUS/TR?
For technical support, including 1N4964CUS/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4964CUS/TR requirements.
6.How does Aetrix verify that 1N4964CUS/TR is sourced from the original manufacturer or authorized distributors?
All 1N4964CUS/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 1N4964CUS/TR meets industry standards.
7.What is the process for return or replacement of 1N4964CUS/TR?
All 1N4964CUS/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4964CUS/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 1N4964CUS/TR part is unused and in its original packaging.
Return procedure for 1N4964CUS/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4964CUS/TR Tags
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