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Microchip Technology 1N4468CUS
- Part No.:
- 1N4468CUS
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4468CUS.pdf
- Description:
- DIODE ZENER 13V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:9,549
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Product details
Overview
1N4468CUS from Microsemi is a military-qualified, voidless hermetically sealed MELF surface-mount Zener diode rated for 1.5 W steady-state power dissipation, with nominal Zener voltage 13.0 V at 19.0 mA test current, dynamic impedance 8 Ω, and maximum reverse leakage of 0.25 µA at 10.4 V. It serves as a precision voltage reference in high-reliability power regulation circuits across aerospace and defense systems.
For engineers reviewing the 1N4468CUS datasheet, 1N4468CUS pinout, 1N4468CUS application, or 1N4468CUS equivalent, key selection criteria include its MIL-PRF-19500/406 qualification level (JANTXV), 2% voltage tolerance (suffix "C"), thermal resistance of 20 °C/W junction-to-end cap, and radiation-hardened construction per MicroNote 050.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across wide current (0.05–1.1 A) and temperature (−65 to +175 °C) ranges. Its voidless glass package with internal Category I metallurgical bond ensures mechanical robustness and long-term stability under thermal cycling and shock.
Designed for high-reliability DC voltage regulation, it delivers low dynamic impedance (8 Ω @ 19 mA) and tight voltage tolerance (±2%), enabling accurate reference generation without external trimming. Non-sensitive to ESD per MIL-STD-750 Method 1020 and inherently radiation-hardened per Microsemi MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 13.0 V at 19.0 mA - defines precise regulation point for feedback loops in power supplies |
| Power Dissipation (PD) | 1.5 W @ 25 °C - supports continuous operation in compact, conduction-cooled layouts |
| Dynamic Impedance (ZZT) | 8 Ω @ IZT = 19 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 0.25 µA @ VR = 10.4 V - enables ultra-low quiescent current in battery-backed references |
| Thermal Resistance (RθJEC) | 20 °C/W - allows direct end-cap heatsinking for sustained 1.5 W operation |
| Operating Temperature | −65 to +175 °C - qualified for extreme-environment avionics and downhole electronics |
| Qualification Level | JANTXV per MIL-PRF-19500/406 - meets stringent screening for mission-critical hardware |
Pinout & Package
Package: A (D-5A) MELF - hermetically sealed voidless glass case with tungsten slugs; cathode indicated by polarity band; weight 193 mg; dimensions BD = 0.091–0.103 in, BL = 0.168–0.200 in.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in reverse-biased Zener configuration |
| Cathode | Breakdown voltage reference terminal | Marked by band; connected to regulated output node in shunt regulator topologies |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and long-term parameter drift in humid or vacuum environments |
| Category I metallurgical bond | Ensures mechanical integrity under 100 g shock and 20 g vibration per MIL-STD-883 |
| Triple-layer passivation | Reduces surface leakage and improves long-term reliability in high-humidity conditions |
| Non-ESD-sensitive design | Eliminates need for on-board ESD protection circuitry in handling and assembly |
| Radiation hardness | Validated performance up to 100 krad(Si) total ionizing dose per MicroNote 050 |
Applications
| Aerospace Power Conditioning | Defense System Reference |
|---|---|
Use Scenario: Regulating auxiliary supply rails in satellite power management units exposed to thermal cycling and radiation. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 13 V bias for ADCs and op-amps. Use Value: Maintains ±2% regulation over −55 to +125 °C with no calibration drift after 100 krad(Si) irradiation. | Use Scenario: Precision voltage reference in missile guidance inertial measurement unit (IMU) analog front-ends. IC Role / Device Role / Timing Role: Primary voltage clamp protecting sensor signal conditioning circuitry from transient overvoltage. Use Value: Withstands 8.3 ms surge currents up to 1.1 A while holding regulation within 13.0 ± 0.26 V. |
| Downhole Telemetry | Avionics Sensor Biasing |
Use Scenario: Providing stable bias for piezoresistive pressure sensors in oil/gas well logging tools operating at 175 °C. IC Role / Device Role / Timing Role: High-temperature Zener reference replacing less stable silicon bandgap references. Use Value: Operates continuously at +175 °C junction temperature with <0.5%/°C tempco and <1 µA leakage. | Use Scenario: Generating calibrated reference voltages for cockpit display system analog-to-digital converters. IC Role / Device Role / Timing Role: Low-noise, low-drift shunt regulator supplying 13 V to precision instrumentation amplifiers. Use Value: Delivers 8 Ω dynamic impedance and <0.25 µA reverse leakage-critical for sub-12-bit ENOB accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4468US | Same package and Zener voltage but ±5% tolerance (no suffix); higher max IR (0.5 µA @ 10.4 V) | Suitable for non-critical industrial regulation where tighter tolerance not required | Select 1N4468US when cost sensitivity outweighs precision needs and JANTXV screening is unnecessary |
| 1N4468 | DO-41 axial-lead variant; same 13 V nominal rating and 1.5 W rating but RθJA ≈ 65 °C/W vs. 20 °C/W for MELF | Used in through-hole prototyping or legacy board designs requiring axial leads | Choose 1N4468 only if board layout mandates axial packaging and thermal derating to ≤0.5 W is acceptable |
Compared with 1N4468US and 1N4468, the 1N4468CUS provides superior thermal performance (20 °C/W vs. ~65 °C/W), tighter 2% tolerance for metrology-grade references, and JANTXV qualification for flight-critical use-making it the sole choice for high-reliability surface-mount applications demanding radiation hardness and long-term stability.
Availability
1N4468CUS is available at Aetrix Electronics and suitable for aerospace power conditioning, defense system reference, and downhole telemetry requiring stable component supply with full traceability and extended lifecycle support.
Supply support for 1N4468CUS 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4460US–1N4496US series was engineered specifically for MIL-PRF-19500/406-compliant Zener regulation in mission-critical systems where failure is not an option-emphasizing hermeticity, radiation tolerance, and thermal resilience.
FAQ
What is the Zener voltage tolerance of the 1N4468CUS?
The 1N4468CUS has a nominal Zener voltage of 13.0 V with a tolerance of ±2%, indicated by the "C" suffix in the part number. This tighter tolerance enables use in precision reference applications where standard ±5% devices would require post-calibration or trimming. The 1N4468CUS achieves this specification under MIL-PRF-19500/406 JANTXV screening conditions.
Is the 1N4468CUS RoHS compliant?
No, the 1N4468CUS is not RoHS compliant. Per Microsemi documentation, RoHS-compliant versions (e.g., with "e3" suffix) are available only for commercial-grade variants-not for JANTXV-qualified parts like the 1N4468CUS. The 1N4468CUS uses Sn/Pb terminations to meet MIL-PRF-19500/406 requirements for solderability and intermetallic stability.
What is the maximum continuous Zener current for the 1N4468CUS?
The maximum continuous Zener current (IZM) for the 1N4468CUS is 1.1 A at 25 °C case temperature, derived from its 1.5 W power rating and 13.0 V nominal Zener voltage. Derating is required above 25 °C per the thermal impedance curve in Figure 3 of the datasheet, with full derating to zero at +175 °C junction temperature.
Does the 1N4468CUS require external heat sinking?
The 1N4468CUS does not require external heat sinking for operation at ≤1.5 W up to +100 °C ambient, thanks to its low 20 °C/W junction-to-end-cap thermal resistance and end-cap mounting capability. However, for sustained 1.5 W operation above 100 °C ambient, direct copper pad thermal coupling to PCB ground planes or metal chassis is recommended to maintain junction temperature below +175 °C.
How is the cathode identified on the 1N4468CUS package?
The cathode of the 1N4468CUS is identified by a single dark band marked on the glass body of the D-5A MELF package. This band aligns with the cathode terminal during PCB placement and must be oriented toward the higher-potential node in shunt regulator configurations. Polarity is unambiguous and consistent across all 1N4460US–1N4496US series parts.
1N4468CUS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, A
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 13 V
- Tolerance:
- ±2%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.4 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:
- D-5A
1N4468CUS FAQ
1.How can I place an order for 1N4468CUS through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4468CUS 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 1N4468CUS reliable?
The price and inventory of 1N4468CUS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4468CUS is usually 5 days.
3.What payment methods are accepted for 1N4468CUS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4468CUS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4468CUS?
1N4468CUS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4468CUS 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 1N4468CUS?
For technical support, including 1N4468CUS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4468CUS requirements.
6.How does Aetrix verify that 1N4468CUS is sourced from the original manufacturer or authorized distributors?
All 1N4468CUS 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 1N4468CUS meets industry standards.
7.What is the process for return or replacement of 1N4468CUS?
All 1N4468CUS units undergo pre-shipment inspection (PSI). If there is an issue with 1N4468CUS, 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 1N4468CUS part is unused and in its original packaging.
Return procedure for 1N4468CUS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4468CUS Tags
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