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Microchip Technology 1N5997UR-1/TR
- Part No.:
- 1N5997UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N5997UR-1/TR.pdf
- Description:
- DIODE ZENER 7.5V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,060
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Product details
Overview
1N5997UR-1/TR from Microsemi is a surface-mount 500 mW Zener diode with nominal Zener voltage 7.5 V, ±5% tolerance (B-suffix), 7.0 mA test current, and 600 Ω dynamic impedance at IZT. It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N5997UR-1/TR datasheet, 1N5997UR-1/TR pinout, 1N5997UR-1/TR application, or 1N5997UR-1/TR equivalent, key selection factors include its DO-213AA MELF package, 7.5 V regulation at low test current, 0.5 W power rating, and RoHS-compliant commercial-grade availability with TR tape-and-reel packaging.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage under varying load and temperature conditions. Its 7.5 V nominal Zener voltage is specified at 5.0 mA test current (IZT), with dynamic impedance of 600 Ω measured at 10% AC modulation superimposed on IZT.
It features hermetically sealed glass DO-213AA (SOD80/MLL34) MELF construction, cathode band polarity marking, and metallurgical bonding for reliability. Thermal resistance junction-to-ambient is 300 °C/W when mounted on FR4 with 1 oz Cu per manufacturer's recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 7.5 V - Stable regulation point at 5.0 mA test current, suitable for precision reference applications |
| Zener Tolerance | ±5% (B-suffix) - Ensures voltage variation within 7.125–7.875 V at IZT |
| Power Dissipation | 0.5 W at 25 °C - Limits maximum continuous power in linear regulator or clamp roles |
| Dynamic Impedance | 600 Ω @ IZT - Indicates voltage stability under small-signal AC ripple; lower values improve regulation |
| Reverse Leakage | 0.5 µA @ 5.0 V - Confirms minimal off-state current below breakdown, critical for low-power bias networks |
| Max Regulator Current | 6.0 mA - Derived from PD/VZM; defines absolute upper DC current limit for safe operation |
| Temp Coefficient | +0.051 %/°C - Predictable positive drift enables compensation in temperature-sensitive references |
Pinout & Package
DO-213AA (SOD80 / MELF) glass package: cylindrical hermetically sealed body with tin-lead or RoHS-compliant matte-tin end-cap plating; cathode indicated by single black band; weight 0.04 g; dimensions A=1.60–1.70 mm, B=3.30–3.70 mm, C=0.41–0.55 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward conduction terminal | Connects to lower-potential node in Zener mode; carries forward current up to 200 mA (VF ≤ 1.1 V) |
| Cathode (banded end) | Zener regulation terminal | Connected to higher-potential node during reverse-bias regulation; defines voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount MELF construction | Enables automated placement and high-reliability solder joints without axial lead stress |
| Hermetic glass sealing | Prevents moisture ingress and ensures long-term parameter stability in harsh environments |
| Metallurgically bonded terminals | Reduces interfacial resistance and improves thermal transfer from junction to end cap |
| ESD insensitivity | Withstands MIL-STD-750 Method 1020 testing-no special handling required in assembly |
| Radiation hardness | Inherently tolerant to total ionizing dose per Microsemi MicroNote 050-suitable for space-qualified designs |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 7.5 V reference for feedback loop in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, sinking excess current to maintain regulated output. Use Value: Delivers 7.5 V ±5% accuracy with +0.051 %/°C tempco, enabling tight output tolerance over –65 to +175 °C. | Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 7.5 V in industrial sensor interfaces. IC Role / Device Role / Timing Role: Functions as passive crowbar element, conducting when input exceeds VZ to divert surge energy. Use Value: Low 600 Ω dynamic impedance ensures rapid clamping response; 0.5 W rating handles short-duration transients. |
| Low-Power Bias Network | Temperature-Compensated Reference |
Use Scenario: Generating precise bias voltage for op-amp input stages in battery-powered instrumentation. IC Role / Device Role / Timing Role: Supplies fixed reference voltage while drawing only 5 mA quiescent current. Use Value: 0.5 µA leakage at 5 V minimizes loading error; DO-213AA package supports compact PCB layout. | Use Scenario: Serving as primary reference in analog front-end where ambient temperature varies widely. IC Role / Device Role / Timing Role: Provides base voltage reference whose drift is compensated using complementary tempcos. Use Value: Positive +0.051 %/°C coefficient allows pairing with negative-coefficient devices for net zero drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C7V5 | Same 7.5 V nominal, ±5% tolerance, but DO-35 axial package; 500 mW rating; 600 Ω ZZT at 5 mA | Requires through-hole assembly; less suitable for high-density SMT layouts | Select when legacy board design mandates axial leads or manual prototyping is preferred |
| MMBZ5227BS | SOT-23 package; 7.5 V, ±5%; 225 mW rating; 30 Ω ZZT at 20 mA - significantly lower impedance but lower power | Higher current capability needed for low-Z regulation; unsuitable for >225 mW dissipation | Select when low dynamic impedance is prioritized over power handling in space-constrained designs |
Compared with BZX55C7V5 and MMBZ5227BS, the 1N5997UR-1/TR offers superior power handling (0.5 W vs. 0.225 W) in an SMT MELF form factor, balancing regulation accuracy, thermal robustness, and automated manufacturability for industrial power rails.
Availability
1N5997UR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface protection circuits, and low-power analog bias networks requiring stable component supply and long-lifecycle support.
Supply support for 1N5997UR-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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N59xxBUR series was designed to deliver JEDEC-standard Zener regulation in ruggedized surface-mount MELF packages, targeting applications demanding extended temperature operation, ESD immunity, and hermetic reliability beyond standard commercial diodes.
FAQ
What is the Zener voltage tolerance of the 1N5997UR-1/TR?
The 1N5997UR-1/TR has a ±5% Zener voltage tolerance, denoted by the "B" suffix in its part number. This means its actual breakdown voltage falls between 7.125 V and 7.875 V when measured at the specified 5.0 mA test current and 30 °C lead temperature, per Microsemi T4-LDS-0228-1 Rev. 1.
Is the 1N5997UR-1/TR RoHS compliant?
Yes, the 1N5997UR-1/TR is RoHS compliant, indicated by the "e3" suffix in its full nomenclature (1N5997BUR-1/TR e3). RoHS compliance applies only to commercial-grade versions; military-screened variants are not RoHS compliant per Microsemi documentation.
What package type does the 1N5997UR-1/TR use?
The 1N5997UR-1/TR uses the DO-213AA glass MELF package (also designated SOD80 or MLL34), featuring hermetically sealed cylindrical construction, tin-lead or RoHS-compliant matte-tin end-cap plating, and cathode identification via a single black band.
What is the maximum DC Zener current for the 1N5997UR-1/TR?
The maximum DC Zener current (IZM) for the 1N5997UR-1/TR is 6.0 mA, calculated per Microsemi's formula IZM = PD/VZM, where PD = 0.5 W and VZM = 7.875 V (upper limit of ±5% tolerance). This value appears in the Electrical Characteristics table on page 3 of T4-LDS-0228-1.
Does the 1N5997UR-1/TR require special ESD handling?
No, the 1N5997UR-1/TR is non-sensitive to ESD per MIL-STD-750 Method 1020, as confirmed in the Applications/Benefits section of the Microsemi datasheet. No special ESD handling or packaging is required during assembly or handling.
1N5997UR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 7.5 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N5997UR-1/TR FAQ
1.How can I place an order for 1N5997UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5997UR-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 1N5997UR-1/TR reliable?
The price and inventory of 1N5997UR-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 1N5997UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5997UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5997UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5997UR-1/TR?
1N5997UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5997UR-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 1N5997UR-1/TR?
For technical support, including 1N5997UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5997UR-1/TR requirements.
6.How does Aetrix verify that 1N5997UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5997UR-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 1N5997UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5997UR-1/TR?
All 1N5997UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5997UR-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 1N5997UR-1/TR part is unused and in its original packaging.
Return procedure for 1N5997UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5997UR-1/TR Tags
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