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Microchip Technology 1N6334US/TR
- Part No.:
- 1N6334US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, B
- Datasheet:
-
1N6334US/TR.pdf
- Description:
- DIODE ZENER 27V 500MW SQ-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:98
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Product details
Overview
1N6334US/TR from Microsemi is a military-qualified, voidless hermetically sealed glass Zener diode with nominal Zener voltage 27.0 V ±5%, 0.5 W power rating, and 27 mA test current (IZ2), designed for high-reliability voltage regulation in aerospace, defense, and radiation-hardened systems.
For engineers reviewing the 1N6334US/TR datasheet, 1N6334US/TR pinout, 1N6334US/TR application, or 1N6334US/TR equivalent, this part delivers stable breakdown performance across -65 °C to +175 °C, low dynamic impedance (16 Ω @ 27 mA), and MIL-PRF-19500/533 qualification at JANTXV level - critical for mission-critical power rail stabilization and reference design.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with tightly controlled voltage regulation (ΔVZ = 1.30 V between 10%–50% IZM) and exhibits a positive temperature coefficient of +0.090 %/°C, enabling predictable thermal drift compensation in precision references. Its voidless glass construction with internal metallurgical bond ensures long-term stability under thermal cycling and mechanical stress.
The device uses a B-SQ MELF ("D") surface-mount package with copper end caps and Sn/Pb finish, optimized for high-reliability soldering (260 °C @ 10 s) and low thermal resistance (RθJEC = 21 °C/W for 1N6321US–1N6355US series). It is non-ESD-sensitive per MIL-STD-750 Method 1020 and inherently radiation-hardened per MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27.0 V ±5% @ 27 mA - defines precise regulation point for feedback loops and reference rails. |
| Power Dissipation (PD) | 0.5 W @ TEC = 150 °C - sets maximum continuous power handling without derating. |
| Dynamic Impedance (ZZT) | 16 Ω @ 27 mA - determines output voltage ripple suppression capability under load transients. |
| Max Surge Current (IZSM) | 21.0 A (8.3 ms square wave) - supports transient overvoltage clamping in protection circuits. |
| Junction Temp Range | -65 °C to +175 °C - enables operation in extreme environmental conditions including space and engine bays. |
| Reverse Leakage (IR) | 0.05 µA @ 21.0 V - ensures minimal quiescent current in high-impedance bias networks. |
| Temp Coefficient (αVZ) | +0.090 %/°C - allows accurate thermal drift modeling for compensated reference designs. |
Pinout & Package
1N6334US/TR uses a two-terminal B-SQ MELF ("D") glass package with axial symmetry and cathode band marking. Terminals are copper end caps with Sn/Pb plating; polarity is indicated by a single black band on the cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in Zener regulator | Connected to circuit ground or lower potential node; carries forward current up to 1.0 A (VF = 1.4 V). |
| Cathode | Reverse breakdown terminal / regulated output node | Connected to input supply; maintains stable 27.0 V reference relative to anode under reverse bias ≥21.0 V. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture ingress and internal voids, ensuring >20-year operational reliability in vacuum and humid environments. |
| MIL-PRF-19500/533 JANTXV qualification | Validated burn-in, life test, and screening per military standard - required for flight-critical avionics and satellite subsystems. |
| Category I metallurgical bond | Internal tungsten-copper bond structure rated for >10⁶ thermal cycles - prevents interfacial delamination under repeated power cycling. |
| Radiation hardness (per MicroNote 050) | Withstands total ionizing dose (TID) ≥100 krad(Si) without parameter shift - suitable for low-earth orbit missions. |
| Non-ESD-sensitive construction | Passes MIL-STD-750 Method 1020 without external protection - simplifies board-level ESD design in ruggedized enclosures. |
Applications
| Aerospace Power Regulation | Defense System Reference |
|---|---|
Use Scenario: Stabilizing 28 V DC bus in satellite power distribution units under wide temperature swings and radiation exposure. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and overvoltage clamp in primary regulation feedback path. Use Value: Maintains ±1.30 V regulation window across -65 °C to +175 °C while surviving 100 krad(Si) TID - eliminating need for redundant regulators. |
Use Scenario: Providing precision 27 V reference for analog-to-digital converter (ADC) biasing in radar front-end receivers. IC Role / Device Role / Timing Role: High-stability voltage reference source for ADC reference input and op-amp bias networks. Use Value: Delivers <0.05 µA leakage at 21 V and +0.090 %/°C tempco - enabling <0.1% full-scale accuracy over military temperature range. |
| Avionics Sensor Conditioning | Nuclear Instrumentation |
Use Scenario: Biasing piezoelectric pressure sensors in jet engine monitoring systems exposed to thermal shock and vibration. IC Role / Device Role / Timing Role: Low-noise Zener reference supplying excitation voltage to sensor bridge circuits. Use Value: 1.0 µV/√Hz noise density (1–3 kHz) and 16 Ω dynamic impedance minimize signal-to-noise degradation in microvolt-level outputs. |
Use Scenario: Voltage clamping and regulation in neutron detector pulse-shaping amplifiers operating inside reactor containment. IC Role / Device Role / Timing Role: Radiation-hardened shunt regulator protecting downstream CMOS comparators from supply transients. Use Value: Withstands 100 krad(Si) TID and 21 A surge current - prevents latch-up or parametric shift during neutron flux spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6334US | Same die, identical electrical specs, but supplied in bulk (not tape-and-reel); no TR suffix. | No automated placement support; requires manual or vibratory bowl feeding. | Select 1N6334US/TR when using pick-and-place assembly; choose 1N6334US for hand-soldered prototypes or low-volume repair. |
| CMZ27-K | Commercial-grade MELF Zener (27 V, ±5%), RθJA = 300 °C/W, no MIL qualification or radiation hardening. | Limited to industrial ambient (-55 °C to +150 °C); unsuitable for aerospace or nuclear environments. | Use CMZ27-K only in cost-sensitive, non-mission-critical applications where MIL spec and radiation tolerance are not required. |
Compared with 1N6334US/TR, the 1N6334US lacks tape-and-reel packaging for SMT automation, while CMZ27-K sacrifices military qualification, radiation hardness, and thermal robustness for lower cost - making 1N6334US/TR the sole choice for flight-qualified or safety-critical Zener regulation.
Availability
1N6334US/TR is available at Aetrix Electronics and suitable for aerospace power regulation, defense system reference, and nuclear instrumentation requiring stable component supply with guaranteed traceability and long-term obsolescence management.
Supply support for 1N6334US/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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and military-qualified analog and mixed-signal components.
The 1N6334US/TR belongs to Microsemi's legacy MIL-PRF-19500/533 qualified Zener diode family, engineered specifically for voltage regulation in mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance and test condition for 1N6334US/TR?
The 1N6334US/TR has a nominal Zener voltage of 27.0 V with ±5% tolerance, measured at a test current (IZ2) of 27 mA and ambient temperature of 25 °C. This tolerance aligns with the standard grade in the 1N6309US–1N6355US series; tighter 1% or 2% options exist under different part numbers (e.g., 1N6334DUS).
Is 1N6334US/TR RoHS compliant?
No - the 1N6334US/TR uses Sn/Pb-plated copper end caps and is not RoHS compliant. RoHS-compliant versions (e.g., 1N6334US e3) are available only in commercial-grade variants, not in JANTXV-qualified configurations like the TR-packaged 1N6334US/TR.
What is the maximum surge current rating for 1N6334US/TR?
The 1N6334US/TR supports a non-repetitive peak Zener surge current (IZSM) of 21.0 A for an 8.3 ms square-wave pulse, as specified in the Electrical Characteristics table. This enables transient overvoltage clamping in power supply protection circuits without device failure.
Does 1N6334US/TR require heatsinking in typical PCB layouts?
No active heatsink is required: the 1N6334US/TR achieves RθJEC = 21 °C/W (junction-to-end-cap) and RθJA = 240 °C/W (junction-to-ambient) on a standard FR4 PCB. At 0.5 W dissipation and TEC = 150 °C, junction temperature remains within safe limits without additional copper pour or thermal vias.
How is polarity identified on the 1N6334US/TR package?
Polarity is marked by a single black cathode band located near one end of the cylindrical B-SQ MELF glass body. The terminal adjacent to the band is the cathode; the opposite end is the anode. This marking is consistent across all 1N6309US–1N6355US series devices.
1N6334US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, B
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 27 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.4 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- B, SQ-MELF
1N6334US/TR FAQ
1.How can I place an order for 1N6334US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6334US/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 1N6334US/TR reliable?
The price and inventory of 1N6334US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6334US/TR is usually 5 days.
3.What payment methods are accepted for 1N6334US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6334US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6334US/TR?
1N6334US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6334US/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 1N6334US/TR?
For technical support, including 1N6334US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6334US/TR requirements.
6.How does Aetrix verify that 1N6334US/TR is sourced from the original manufacturer or authorized distributors?
All 1N6334US/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 1N6334US/TR meets industry standards.
7.What is the process for return or replacement of 1N6334US/TR?
All 1N6334US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N6334US/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 1N6334US/TR part is unused and in its original packaging.
Return procedure for 1N6334US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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