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Microchip Technology 1N5248A
- Part No.:
- 1N5248A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5248A.pdf
- Description:
- DIODE ZENER 18V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,842
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Product details
Overview
1N5248A from Microsemi is a 18 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 7.0 mA test current, 600 Ω dynamic impedance at IZK, and 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 1N5248A datasheet, 1N5248A pinout, 1N5248A application, or 1N5248A equivalent, key selection criteria include its 18 V nominal Zener voltage, 10% tolerance, 600 Ω Zener impedance at 0.25 mA, thermal resistance of 250 °C/W (junction-to-lead), and cathode-band polarity marking for correct orientation in shunt regulation.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its design centers on predictable Zener knee behavior, low capacitance (<2.5 pF typical per Figure 2), and radiation-hardened construction per MicroNote 050.
The device uses a hermetically sealed glass DO-35 package with tin-lead or RoHS-compliant matte-tin plating, enabling reliable axial mounting and soldering at 260 °C for 10 s. It exhibits a positive voltage temperature coefficient of +0.085 %/°C (25–125 °C), confirming stable regulation above ~5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 18 V at 7.0 mA test current - defines primary regulation point in shunt configuration |
| Tolerance | ±10% (A suffix) - sets absolute voltage window: 16.2 V to 19.8 V at 25 °C |
| Power Dissipation | 500 mW at 25 °C - limits continuous DC power; derates linearly above 25 °C (250 °C/W junction-to-lead) |
| Zener Impedance (ZZT) | 600 Ω at IZK = 0.25 mA - indicates dynamic resistance near knee; impacts regulation stability at low currents |
| Reverse Current (IR) | 10 μA max at VR = 14.4 V - defines leakage threshold before significant conduction begins |
| Temperature Coefficient (αVZ) | +0.085 %/°C - quantifies voltage drift with temperature; enables compensation in precision references |
| Operating Temperature | –65 °C to +175 °C - supports aerospace, downhole, and high-reliability industrial environments |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package: hermetically sealed, 0.2 g weight, cathode indicated by single black band; leads are tinned copper, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; carries reverse leakage current when cathode is biased positive |
| Cathode | Banded end | Connected to higher-potential node; establishes Zener breakdown voltage relative to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N52xx standard for interchangeability and guaranteed VZ, IR, and VF limits |
| Hermetic glass seal | Ensures long-term parameter stability and moisture resistance in harsh environments |
| Radiation hardness | Inherently radiation-tolerant per MicroNote 050 - suitable for space-qualified and nuclear applications |
| ESD insensitivity | Immune to electrostatic discharge per MIL-STD-750 Method 1020 - eliminates need for handling safeguards |
| Low capacitance | Typical <2.5 pF (Figure 2) - minimizes signal coupling and high-frequency loading in RF-adjacent circuits |
Applications
| Industrial Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback loops using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 18 V reference to TL431 or similar error amplifier input. Use Value: Maintains ±10% output regulation across line/load/temperature with minimal parts count and no active bias circuitry. | Use Scenario: Protects microcontroller I/O pins or sensor inputs from transient overvoltage events exceeding 18 V. IC Role / Device Role / Timing Role: Passive clamping element that conducts excess energy to ground once input exceeds 18 V ±10%. Use Value: Limits peak voltage to safe levels without adding propagation delay or requiring control logic-ideal for fast transients. |
| Precision Analog Reference | Aerospace Sensor Biasing |
Use Scenario: Supplies stable bias voltage to op-amp input stages or ADC reference dividers in instrumentation-grade signal chains. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source replacing higher-cost IC references where 10% tolerance suffices. Use Value: Delivers 18 V reference with +0.085 %/°C TC and <2.5 pF capacitance-minimizing thermal drift and capacitive loading effects. | Use Scenario: Provides regulated excitation voltage to strain gauges or RTDs in flight control or engine monitoring systems. IC Role / Device Role / Timing Role: Radiation-hardened, wide-temperature-range shunt regulator ensuring sensor accuracy under extreme environmental stress. Use Value: Operates continuously from –65 °C to +175 °C with inherent TID tolerance-eliminating need for shielding or derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5248B | ±5% tolerance (vs. ±10% for 1N5248A); otherwise identical electrical and mechanical specs | Higher precision required in feedback loops where tighter output regulation is critical | Select 1N5248B when system-level voltage tolerance budget demands <±5% variation at 18 V |
| MMBZ5248B (SOT-23) | Same 18 V, ±5% rating but surface-mount MMBZ package; 225 mW power rating; different thermal resistance | Used in space-constrained PCBs where axial leads are incompatible with automated assembly | Choose MMBZ5248B only if board layout mandates SMT and power dissipation remains ≤225 mW |
Compared with 1N5248B and MMBZ5248B, the 1N5248A offers the lowest cost and broadest temperature range among 18 V Zeners, while trading tolerance for ruggedness and ease of manual prototyping-making it optimal for industrial and aerospace applications where reliability outweighs fine voltage resolution.
Availability
1N5248A is available at Aetrix Electronics and suitable for industrial power supply feedback, overvoltage clamp protection, and aerospace sensor biasing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N5248A 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 1N52xx series was designed specifically for robust, low-cost voltage regulation in mission-critical systems where wide temperature operation, hermetic sealing, and ESD immunity are mandatory-not just desirable.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5248A?
The 1N5248A has a nominal Zener voltage of 18 V with a ±10% tolerance, meaning its actual breakdown voltage falls between 16.2 V and 19.8 V at 25 °C and 7.0 mA test current. This tolerance is confirmed by the "A" suffix per Microsemi's documentation and applies across the full operating temperature range.
Can the 1N5248A be used in surface-mount designs?
No-the 1N5248A is exclusively packaged in the axial-leaded DO-35 (DO-204AH) glass case and requires through-hole mounting. For surface-mount equivalents, Microsemi offers the MMBZ5248B in SOT-23, but it has lower power rating (225 mW) and different thermal characteristics-so direct substitution is not recommended without redesign.
What is the maximum power dissipation of the 1N5248A and how does it derate with temperature?
The 1N5248A dissipates up to 500 mW at 25 °C, with thermal resistance of 250 °C/W junction-to-lead at 3/8″ lead length. Power derates linearly above 25 °C: at 100 °C ambient, maximum dissipation drops to approximately 312.5 mW. Derating curve is shown in Figure 1 of the official Microsemi datasheet.
Does the 1N5248A require external current limiting in circuit design?
Yes-the 1N5248A must be used with a series current-limiting resistor to prevent exceeding its 500 mW power rating. The resistor value is calculated based on input voltage, desired Zener current (e.g., 7.0 mA), and worst-case VZ variation. Without proper limiting, excessive current causes thermal runaway and permanent failure.
Is the 1N5248A suitable for high-reliability aerospace applications?
Yes-the 1N5248A is inherently radiation-hardened per MicroNote 050, operates from –65 °C to +175 °C, and is available with military screening (e.g., JANTXV prefix) when ordered with "-1" suffix. Its hermetic glass package and ESD insensitivity make it qualified for avionics and satellite subsystems where long-term parametric stability is essential.
1N5248A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 13.3 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)
1N5248A FAQ
1.How can I place an order for 1N5248A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5248A 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 1N5248A reliable?
The price and inventory of 1N5248A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5248A is usually 5 days.
3.What payment methods are accepted for 1N5248A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5248A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5248A?
1N5248A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5248A 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 1N5248A?
For technical support, including 1N5248A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5248A requirements.
6.How does Aetrix verify that 1N5248A is sourced from the original manufacturer or authorized distributors?
All 1N5248A 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 1N5248A meets industry standards.
7.What is the process for return or replacement of 1N5248A?
All 1N5248A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5248A, 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 1N5248A part is unused and in its original packaging.
Return procedure for 1N5248A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5248A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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