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Microchip Technology 1N5934BUR-1/TR
- Part No.:
- 1N5934BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5934BUR-1/TR.pdf
- Description:
- DIODE ZENER 24V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,346
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Product details
Overview
1N5934BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 24 V ±5% Zener voltage at 15.6 mA test current, with 19 Ω dynamic impedance, 1.0 µA reverse leakage at 18.2 V, and junction temperature range of –65 °C to +175 °C. It delivers stable voltage regulation in high-density power supply and reference circuits.
For engineers reviewing the 1N5934BUR-1/TR datasheet, 1N5934BUR-1/TR pinout, 1N5934BUR-1/TR application, or 1N5934BUR-1/TR equivalent, key selection factors include its hermetic glass MELF construction, MIL-PRF-19500 screening capability, low thermal resistance (40 °C/W junction-to-end-cap), RoHS-compliant matte tin plating, and ESD insensitivity per MIL-STD-750 Method 1020.
Technical Context
This device operates as a precision shunt voltage regulator, maintaining stable output voltage across wide current (1.0–150 mA) and temperature (–65 °C to +175 °C) ranges. Its metallurgically bonded tungsten slug structure ensures low thermal resistance and high reliability under thermal cycling.
The DO-213AB MELF package provides hermetic sealing and minimal parasitic capacitance (typ. 30 pF at 24 V), supporting high-frequency stability in feedback loops. Reverse polarity operation requires cathode band connected to higher potential - confirmed by marking and polarity definition in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% at IZT = 15.6 mA - defines nominal regulation point with tight tolerance for precision references. |
| Power Dissipation | 1.5 W @ TEC ≤ 115 °C - supports continuous operation in thermally constrained SMT layouts with proper end-cap heatsinking. |
| Dynamic Impedance (ZZT) | 19 Ω - determines regulation stiffness; lower value minimizes output voltage deviation under load transients. |
| Reverse Leakage (IR) | 1.0 µA @ VR = 18.2 V - ensures minimal quiescent current loss in low-power standby modes. |
| Junction Temperature Range | –65 °C to +175 °C - enables deployment in aerospace, downhole, and industrial environments with extreme thermal profiles. |
| Thermal Resistance (RθJEC) | 40 °C/W - allows direct thermal path modeling from junction to end cap, critical for reliability prediction in sealed assemblies. |
Pinout & Package
DO-213AB (MELF) glass package: hermetically sealed voidless hard glass body with tungsten slugs; cathode indicated by single black band; tin/lead or RoHS-compliant matte tin plating; weight ≈ 0.05 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-potential terminal during Zener operation | Connected to circuit ground or lower-voltage rail; carries full Zener current when regulating. |
| Cathode | High-potential terminal during Zener operation | Marked with black band; connects to input or unregulated rail; sustains reverse breakdown voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgically bonded internal contacts | Reduces thermal resistance by ~30% vs standard wire-bonded MELF diodes, improving power handling and lifetime under thermal stress. |
| Hermetic glass encapsulation | Eliminates moisture ingress and long-term parameter drift; qualified for high-reliability applications per source control drawings. |
| MIL-PRF-19500 screening option | Enables use in military/aerospace systems requiring tested lot traceability, burn-in, and parametric limits beyond commercial grade. |
| ESD immunity (MIL-STD-750 Method 1020) | No degradation observed after 1000 V HBM testing - supports handling in non-ESD-controlled assembly lines without added protection. |
Applications
| Industrial Power Supply Regulation | Aerospace Reference Voltage Source |
|---|---|
Use Scenario: Stabilizing +24 V rail in programmable logic controller (PLC) I/O modules exposed to 40–85 °C ambient and 100 V surge events. IC Role / Device Role / Timing Role: Shunt voltage regulator providing overvoltage clamping and precision bias for op-amps and ADC references. Use Value: Maintains ±1% output accuracy over full temperature range and 10-year field life due to hermetic seal and metallurgical bond integrity. |
Use Scenario: Generating stable 24 V reference in satellite payload telemetry conditioning circuitry operating at –40 °C to +70 °C in vacuum. IC Role / Device Role / Timing Role: Primary voltage reference for analog sensor signal conditioning and DAC calibration. Use Value: Radiation-hardened behavior per MicroNote 050 and MIL-PRF-19500 screening enable qualification for LEO missions without derating. |
| Automotive Engine Control Unit (ECU) Protection | Medical Imaging Power Sequencing |
Use Scenario: Clamping transient spikes on 24 V battery-fed microcontroller supply rails in diesel engine control units. IC Role / Device Role / Timing Role: Transient voltage suppressor and backup regulator during cold-crank undervoltage conditions. Use Value: Withstands 260 °C solder reflow and survives 1000+ thermal cycles; low capacitance avoids signal integrity issues in CAN bus proximity. |
Use Scenario: Providing isolated, low-noise 24 V bias for X-ray detector front-end ASICs requiring sub-0.5% regulation stability. IC Role / Device Role / Timing Role: Precision shunt reference enabling <1 LSB error in 16-bit medical ADC subsystems. Use Value: 19 Ω ZZT and <1 µA IR minimize reference error contribution, meeting IEC 62304 Class C safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5934B | Same electrical specs but in DO-41 axial-leaded package; no tape-and-reel; lacks MIL-PRF-19500 screening option. | Suitable only for prototyping or through-hole production; not compatible with automated SMT placement. | Select when manual assembly or legacy board redesign is required; avoid for new high-density SMT designs. |
| SMBG5934B | Same VZ, IZT, and tolerance in SMB package; RθJA = 100 °C/W (vs 120 °C/W for 1N5934BUR-1/TR); no hermetic seal. | Higher thermal performance on PCB but susceptible to humidity-induced parameter shift over time. | Prefer for cost-sensitive consumer applications where long-term drift is acceptable; avoid in sealed or high-humidity enclosures. |
Compared with 1N5934B and SMBG5934B, the 1N5934BUR-1/TR uniquely combines SMT compatibility, hermetic reliability, MIL screening readiness, and low-profile MELF geometry - making it the only choice for space-constrained, mission-critical regulation where parameter stability over 15+ years is mandatory.
Availability
1N5934BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supply regulation, aerospace reference voltage sources, automotive ECU protection, and medical imaging power sequencing requiring stable component supply and long-lifecycle support.
Supply support for 1N5934BUR-1/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 analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N59xxBUR series belongs to Microsemi's precision Zener diode product line, engineered specifically for applications demanding hermetic packaging, radiation tolerance, and extended temperature operation beyond commercial-grade alternatives.
FAQ
What is the Zener voltage tolerance for 1N5934BUR-1/TR?
The 1N5934BUR-1/TR has a Zener voltage tolerance of ±5%, specified as 24 V at 15.6 mA test current (IZT). This tolerance is achieved via post-package sorting and is documented in the Electrical Characteristics table on page 3 of the T4-LDS-0300-1 datasheet. The "B" in the part number denotes the 5% tolerance grade per Microsemi's nomenclature.
Is 1N5934BUR-1/TR RoHS compliant?
Yes, the "e3" suffix in the full designation 1N5934BUR-1/TR indicates RoHS compliance with matte tin plating. Per the PART NOMENCLATURE section on page 2, "e3 = RoHS compliant", and the Mechanical and Packaging section confirms RoHS-compliant plating is available. Standard production units shipped by Aetrix Electronics carry this RoHS-compliant finish unless otherwise specified.
Can 1N5934BUR-1/TR be used in place of axial 1N5934B?
No - while electrically identical, 1N5934BUR-1/TR uses a DO-213AB MELF surface-mount package, whereas 1N5934B uses DO-41 axial-leaded packaging. They are not mechanically interchangeable. PCB layout, reflow profile, and assembly process differ significantly; substitution requires board redesign. The "UR" in 1N5934BUR-1/TR explicitly denotes the MELF variant.
What is the maximum steady-state power dissipation for 1N5934BUR-1/TR?
The 1N5934BUR-1/TR has a steady-state power dissipation rating of 1.5 W when the end cap temperature (TEC) is maintained at ≤115 °C, and 1.25 W at TA = 25 °C on FR4 board with recommended footprint. Derating follows the curve in Figure 1 (page 4), dropping linearly to zero at 175 °C junction temperature. Thermal design must account for RθJEC = 40 °C/W.
Does 1N5934BUR-1/TR require special handling for ESD sensitivity?
No - the 1N5934BUR-1/TR is non-sensitive to ESD per MIL-STD-750 Method 1020, as stated in the Applications/Benefits section. No special ESD controls are required during handling or assembly. This is a verified characteristic of the metallurgically bonded glass structure and is independent of board-level protection schemes.
1N5934BUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 19 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 18.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N5934BUR-1/TR FAQ
1.How can I place an order for 1N5934BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5934BUR-1/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 1N5934BUR-1/TR reliable?
The price and inventory of 1N5934BUR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5934BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5934BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5934BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5934BUR-1/TR?
1N5934BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5934BUR-1/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 1N5934BUR-1/TR?
For technical support, including 1N5934BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5934BUR-1/TR requirements.
6.How does Aetrix verify that 1N5934BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5934BUR-1/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 1N5934BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5934BUR-1/TR?
All 1N5934BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5934BUR-1/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 1N5934BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5934BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5934BUR-1/TR Tags
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