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Microchip Technology 1N4967US/TR
- Part No.:
- 1N4967US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N4967US/TR.pdf
- Description:
- DIODE ZENER 24V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:89
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Product details
Overview
1N4967US/TR from Microsemi is a surface-mount, voidless-hermetically-sealed glass Zener diode rated for 5 W power dissipation at TEC = 140 °C, with nominal Zener voltage 24 V ±5%, dynamic impedance 5.0 Ω at 50 mA test current, and operating junction temperature range −65 °C to +175 °C. It serves as a precision voltage reference or overvoltage clamp in high-reliability military and aerospace power regulation circuits.
For engineers reviewing the 1N4967US/TR datasheet, 1N4967US/TR pinout, 1N4967US/TR application, or 1N4967US/TR equivalent, key selection criteria include its hermetic glass package, Category I metallurgical bond, −65 °C to +175 °C operation, 24 V regulation stability under wide current variation, and MIL-PRF-19500/356 qualification for mission-critical systems.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage (24 V @ IZT = 50 mA), low dynamic impedance (5.0 Ω), and minimal voltage drift (αVZ = +0.090 %/°C). Its regulation holds across 10%–50% of IZM, delivering ΔVZ ≤ 2.0 V per specification.
The 1N4967US/TR uses a tungsten-slug, voidless hard-glass case with copper end caps (Sn/Pb finish), cathode band polarity marking, and EIA-481-B tape-and-reel packaging. Thermal resistance is 7 °C/W (junction-to-end-cap), enabling stable 5 W dissipation up to 140 °C end-cap temperature before linear derating to zero at 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 24 V ±5% at IZT = 50 mA - defines regulated output voltage under standard test conditions |
| Power Dissipation | 5 W @ TEC = 140 °C - maximum continuous power handling before thermal derating begins |
| Dynamic Impedance | 5.0 Ω @ IZT = 50 mA - low AC impedance ensures stable regulation against load transients |
| Junction Temperature Range | −65 °C to +175 °C - enables operation in extreme environmental conditions without parameter shift |
| Reverse Leakage Current | 2 μA @ VR = 18.2 V - ultra-low leakage preserves accuracy in high-impedance bias networks |
| Thermal Resistance | 7 °C/W (junction-to-end-cap) - determines required heatsinking for sustained 5 W operation |
| Surge Current | 6.5 A @ 8.3 ms - withstands short-duration transient overloads without degradation |
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, and weight 539 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Reverse-biased Zener terminal / regulation output node | Provides stable 24 V reference when biased above breakdown; marked by band |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass construction | Eliminates internal voids to prevent moisture ingress and long-term parameter drift in harsh environments |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability per MIL-PRF-19500/356 Class H |
| Triple-layer passivation | Protects semiconductor junction from contamination and surface conduction effects |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Radiation-hardened design | Inherently tolerant to total ionizing dose (TID) per Microsemi MicroNote 050, suitable for space applications |
Applications
| Aerospace Power Conditioning | Military Avionics Reference |
|---|---|
Use Scenario: Regulating auxiliary 24 V rail in satellite power distribution units exposed to thermal vacuum and radiation. IC Role / Device Role / Timing Role: Zener diode providing primary voltage reference and overvoltage clamping function. Use Value: Maintains 24 V regulation within ±5% across −65 °C to +175 °C and survives 100+ krad(Si) TID exposure. | Use Scenario: Stabilizing reference voltage for analog-to-digital converters in fighter jet flight control computers. IC Role / Device Role / Timing Role: Precision shunt regulator establishing stable 24 V bias for sensor signal conditioning. Use Value: Delivers <2 μA leakage at 18.2 V and <5 Ω dynamic impedance to minimize ADC offset error. |
| Tactical Radio Transceiver Protection | High-Reliability Industrial PLC Input |
Use Scenario: Clamping surge-induced overvoltage on 24 V DC input lines of manpack radios subjected to lightning-induced transients. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 6.5 A surges (8.3 ms) without failure. Use Value: Withstands repeated 8.3 ms surges up to 6.5 A while maintaining 24 V clamping threshold and post-surge parameter stability. | Use Scenario: Providing fail-safe 24 V reference for isolated digital input modules in nuclear plant control cabinets. IC Role / Device Role / Timing Role: Shunt regulator ensuring consistent logic-level translation despite supply ripple and aging. Use Value: Operates continuously at 140 °C end-cap temperature with no parameter shift over 20-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4967US | Same electrical specs and package; differs only in packaging format (bulk vs. tape-and-reel) | No functional difference; identical use in PCB assembly | Select 1N4967US/TR for automated SMT placement; choose 1N4967US for manual or low-volume prototyping |
| 1N4967 | Axial-leaded version (no "US" suffix); same Zener voltage and power rating but different thermal path and mounting | Requires through-hole footprint and lacks hermetic glass seal; lower thermal resistance to ambient | Choose 1N4967 only if board layout mandates axial leads and MIL-spec hermeticity is not required |
Compared with 1N4967US and 1N4967, the 1N4967US/TR offers identical regulation performance plus EIA-481-B tape-and-reel compatibility for high-volume SMT production, while retaining full MIL-PRF-19500/356 qualification and hermetic reliability unattainable with axial-leaded alternatives.
Availability
1N4967US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, military avionics reference, and tactical radio transceiver protection requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4967US/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 defense, aerospace, and industrial markets.
The 1N4967US/TR belongs to Microsemi's military-qualified Zener diode family engineered for fail-operational voltage regulation in systems where parameter stability under extreme thermal, radiation, and mechanical stress is non-negotiable.
FAQ
What is the Zener voltage tolerance of the 1N4967US/TR?
The 1N4967US/TR has a nominal Zener voltage of 24 V with a standard tolerance of ±5%, as specified in the Electrical Characteristics table at IZT = 50 mA. No suffix indicates this standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes not present in the 1N4967US/TR part number.
Does the 1N4967US/TR meet MIL-PRF-19500/356 requirements?
Yes, the 1N4967US/TR is qualified to MIL-PRF-19500/356 as a JAN, JANTX, JANTXV, or JANS device depending on screening level. Its voidless hermetic glass package, Category I metallurgical bond, triple-layer passivation, and −65 °C to +175 °C operation fully satisfy the specification's reliability and environmental requirements.
What is the maximum continuous Zener current for the 1N4967US/TR?
The maximum continuous Zener current (IZM) for the 1N4967US/TR is 198 mA, calculated from P = V × I using its 5 W power rating and 24 V nominal Zener voltage. This value is confirmed in the Electrical Characteristics table and assumes operation at TEC = 140 °C with appropriate thermal management.
How does the 1N4967US/TR handle transient overcurrent events?
The 1N4967US/TR supports a nonrepetitive peak surge current (IZSM) of 6.5 A for an 8.3 ms square-wave pulse, as defined in the Maximum Ratings table. This capability allows it to absorb common power-line transients without degradation, provided the average power remains within 5 W limits.
Is the 1N4967US/TR compatible with lead-free soldering processes?
The 1N4967US/TR features Sn/Pb-finished copper end caps, making it incompatible with Pb-free reflow profiles. For RoHS-compliant assembly, Microsemi offers alternative part numbers with matte tin terminations; the 1N4967US/TR itself requires traditional Sn63/Pb37 soldering and must be segregated in mixed-technology lines.
1N4967US/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):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 18.2 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
1N4967US/TR FAQ
1.How can I place an order for 1N4967US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4967US/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 1N4967US/TR reliable?
The price and inventory of 1N4967US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4967US/TR is usually 5 days.
3.What payment methods are accepted for 1N4967US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4967US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4967US/TR?
1N4967US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4967US/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 1N4967US/TR?
For technical support, including 1N4967US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4967US/TR requirements.
6.How does Aetrix verify that 1N4967US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4967US/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 1N4967US/TR meets industry standards.
7.What is the process for return or replacement of 1N4967US/TR?
All 1N4967US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4967US/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 1N4967US/TR part is unused and in its original packaging.
Return procedure for 1N4967US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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