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Microchip Technology 1N5248BE3/TR
- Part No.:
- 1N5248BE3/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5248BE3/TR.pdf
- Description:
- DIODE ZENER 18V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,495
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Product details
Overview
1N5248BE3/TR from Microsemi is a 18 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 7.0 mA test current and 600 Ω maximum zener impedance at knee current, operating from −65°C to +175°C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.
For engineers reviewing the 1N5248BE3/TR datasheet, 1N5248BE3/TR pinout, 1N5248BE3/TR application, or 1N5248BE3/TR equivalent, key selection criteria include its 18 V nominal zener voltage, 5% tolerance (B suffix), RoHS-compliant matte-tin plating (e3), tape-and-reel packaging (TR), and thermal resistance of 250°C/W junction-to-lead.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its regulation relies on controlled avalanche and Zener mechanisms depending on voltage level, with specified dynamic impedance measured at both IZT (7.0 mA) and IZK (0.25 mA).
The device features a hermetically sealed glass DO-35 package with cathode band marking, tin-lead or RoHS-compliant annealed matte-tin plating, and is rated for soldering at 260°C for 10 seconds. It exhibits minimal capacitance and inherent radiation hardness per MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 18 V at 7.0 mA test current - defines regulated output voltage in shunt configuration |
| Zener Tolerance | ±5% (B suffix) - ensures voltage accuracy within 17.1–18.9 V at 25°C |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous power handling before thermal derating |
| Zener Impedance | 600 Ω max at IZK = 0.25 mA - indicates voltage stability under low-current regulation |
| Operating Temperature | −65°C to +175°C - supports deployment in harsh industrial, aerospace, and downhole environments |
| Thermal Resistance | 250°C/W junction-to-lead (3/8″ lead length) - determines temperature rise per watt dissipated |
| Reverse Current | 0.1 μA max at VR = 14.3 V - confirms low leakage below breakdown threshold |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by a single black band; leads are flexible axial terminals suitable for through-hole mounting. Polarity must be observed: banded end is cathode and must be held positive relative to anode for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse-biased during regulation |
| Cathode | Zener breakdown terminal | Banded end; connected to higher-potential node to enable reverse-bias regulation at 18 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 package | Industry-standard mechanical and thermal interface compatible with legacy axial-leaded assembly processes |
| RoHS-compliant matte-tin plating (e3) | Lead-free termination meeting environmental compliance without sacrificing solderability or reliability |
| Tape-and-reel packaging (TR) | Automated pick-and-place ready format supporting high-volume SMT-compatible through-hole insertion |
| Radiation-hardened construction | Inherent hardness per MicroNote 050 enables use in space-grade and nuclear instrumentation applications |
| ESD-insensitive design | Robustness to MIL-STD-750 Method 1020 eliminates need for ESD handling precautions in production |
Applications
| Industrial Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 18 V reference to optocoupler input or TL431 comparator. Use Value: Enables ±1% output regulation accuracy despite line/load transients and temperature drift up to +175°C. | Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events exceeding 18 V. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground when input exceeds 18 V. Use Value: Limits voltage excursion to 18.9 V (max) with <0.1 μA leakage below clamp threshold, preserving signal integrity. |
| Low-Power Analog Reference | Aerospace Sensor Biasing |
Use Scenario: Generating stable bias voltage for op-amp input stages in battery-powered sensor front-ends. IC Role / Device Role / Timing Role: Precision shunt regulator supplying clean 18 V to rail-to-rail amplifier rails. Use Value: Delivers <600 Ω dynamic impedance at 0.25 mA, minimizing voltage shift under varying load currents. | Use Scenario: Providing regulated excitation voltage to piezoresistive pressure sensors in flight control systems. IC Role / Device Role / Timing Role: Radiation-tolerant voltage reference ensuring sensor calibration stability in high-altitude environments. Use Value: Maintains regulation across −65°C to +175°C with proven hardness per MicroNote 050, eliminating recalibration cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5248B | Same electrical specs but in bulk packaging (no TR suffix); lacks tape-and-reel carrier | Not suitable for automated assembly; requires manual loading or tube-to-tape conversion | Select 1N5248B only for prototyping or low-volume hand-soldered builds |
| MMBZ5248B-TP | Surface-mount SOT-23 package; same 18 V/±5%/500 mW rating but 350 mW derated power at TA=25°C | Enables PCB space reduction but requires rework for thermal management due to higher junction-to-ambient resistance | Choose MMBZ5248B-TP only when board area constraints outweigh thermal performance needs |
Compared with 1N5248BE3/TR, 1N5248B omits tape-and-reel logistics support while retaining identical regulation performance, whereas MMBZ5248B-TP trades axial-leaded robustness and thermal efficiency for miniaturization-making the original ideal for high-reliability through-hole designs requiring automated placement and wide-temperature operation.
Availability
1N5248BE3/TR is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, low-power analog references, and aerospace sensor biasing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N5248BE3/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) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-voltage analog components for defense, aerospace, and industrial markets.
The 1N52xxB series was designed specifically for precision voltage regulation in mission-critical systems where long-term stability, wide temperature operation, and environmental resilience are mandatory-not just general-purpose Zener replacement.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5248BE3/TR?
The 1N5248BE3/TR has a nominal Zener voltage of 18 V with a tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its actual breakdown voltage falls between 17.1 V and 18.9 V at 25°C under the specified test current of 7.0 mA. The "e3" denotes RoHS-compliant matte-tin plating, and "TR" confirms tape-and-reel packaging for automated assembly. These specifications are verified per JEDEC standards and Microsemi's published electrical characteristics table.
What package type and marking does the 1N5248BE3/TR use?
The 1N5248BE3/TR uses the DO-35 (DO-204AH) glass axial-leaded package with hermetic sealing and flexible leads. Its cathode is marked by a single black band on the glass body, and the full part number "1N5248B" is laser-marked on the surface. The "e3" suffix confirms RoHS-compliant annealed matte-tin plating, and "TR" indicates EIA-296 standard tape-and-reel packaging. This configuration supports manual and automated through-hole insertion with reliable solder joint formation at 260°C for 10 seconds.
How does the 1N5248BE3/TR perform under high-temperature conditions?
The 1N5248BE3/TR is rated for continuous operation from −65°C to +175°C, with power derating beginning above 25°C per Figure 1 in the datasheet. At +125°C ambient, its usable power drops to approximately 300 mW, and at +175°C, it sustains ~125 mW. Its temperature coefficient is +0.085%/°C, meaning its Zener voltage increases by ~15.3 mV per °C rise above 25°C. This behavior is fully characterized and validated for use in engine control units and downhole tools where thermal stability is critical.
Can the 1N5248BE3/TR replace older non-RoHS versions like 1N5248B in existing designs?
Yes, the 1N5248BE3/TR is a direct drop-in replacement for 1N5248B in terms of electrical performance, package dimensions, and thermal characteristics-the only difference is the RoHS-compliant matte-tin plating instead of traditional tin-lead. No PCB layout or schematic changes are required. The "e3" suffix does not affect regulation accuracy, leakage, or impedance. However, reflow profile adjustments may be needed to accommodate the different solder alloy wetting behavior, especially in wave soldering processes.
What is the maximum Zener impedance and why does it matter for the 1N5248BE3/TR?
The 1N5248BE3/TR has a maximum Zener impedance of 600 Ω at IZK = 0.25 mA, and 21 Ω at IZT = 7.0 mA. Low impedance ensures minimal voltage variation under changing load currents-critical for maintaining regulation accuracy in feedback loops or reference circuits. At 0.25 mA, 600 Ω implies a worst-case voltage shift of 150 mV per 0.25 mA change, which directly impacts precision in low-current biasing applications. This parameter is measured per MicroNote 202 and guarantees sharp knee characteristics for stable breakdown behavior.
1N5248BE3/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5248BE3/TR FAQ
1.How can I place an order for 1N5248BE3/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5248BE3/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 1N5248BE3/TR reliable?
The price and inventory of 1N5248BE3/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5248BE3/TR is usually 5 days.
3.What payment methods are accepted for 1N5248BE3/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5248BE3/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5248BE3/TR?
1N5248BE3/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5248BE3/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 1N5248BE3/TR?
For technical support, including 1N5248BE3/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5248BE3/TR requirements.
6.How does Aetrix verify that 1N5248BE3/TR is sourced from the original manufacturer or authorized distributors?
All 1N5248BE3/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 1N5248BE3/TR meets industry standards.
7.What is the process for return or replacement of 1N5248BE3/TR?
All 1N5248BE3/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5248BE3/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 1N5248BE3/TR part is unused and in its original packaging.
Return procedure for 1N5248BE3/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5248BE3/TR Tags
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