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Microchip Technology 1N5243A/TR
- Part No.:
- 1N5243A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5243A/TR.pdf
- Description:
- DIODE ZENER 13V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,623
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Product details
Overview
1N5243A/TR from Microsemi is a 13 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 9.5 mA test current, 13 Ω dynamic impedance at IZT, 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 1N5243A/TR datasheet, 1N5243A/TR pinout, 1N5243A/TR application, or 1N5243A/TR equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (250°C/W junction-to-lead), temperature coefficient (+0.079%/°C), low reverse leakage (<10 μA at 10.4 V), and RoHS-compliant tin-lead plating with band-marked cathode polarity.
Technical Context
This discrete Zener diode operates in reverse breakdown mode with a sharp knee at 9.5 mA test current, delivering stable regulation across wide temperature and current ranges. Its DO-35 glass package provides hermetic sealing, radiation hardness per MicroNote 050, and ESD insensitivity per MIL-STD-750 Method 1020.
Designed for axial-leaded through-hole mounting, it features minimal junction capacitance (typ. <2 pF at 0 V), forward voltage ≤1.5 V at 200 mA, and thermal derating to 0.48 W at 25°C ambient on FR4 board with specified copper layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V nominal, ±10% tolerance (11.7–14.3 V), ensuring predictable clamping in feedback loops |
| Power Dissipation | 500 mW at 25°C case temperature; derates linearly to zero at 175°C junction |
| Zener Impedance (ZZT) | 13 Ω at 9.5 mA test current, enabling tight regulation under varying load conditions |
| Reverse Leakage (IR) | <10 μA at 10.4 V (80% of VZ), minimizing standby current loss |
| Temp. Coefficient (αVZ) | +0.079 %/°C (25°C to 125°C), supporting stable reference in industrial environments |
| Package | DO-35 (DO-204AH) glass axial-lead, hermetically sealed, 0.2 g weight, cathode band marked |
| Operating Temp. | –65°C to +175°C, suitable for aerospace, downhole, and high-reliability embedded systems |
Pinout & Package
DO-35 (DO-204AH) glass axial-lead package with cathode indicated by a painted band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Mounting requires 3/8″ (10 mm) lead length from body for rated thermal resistance of 250°C/W junction-to-lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; reverse-biased during regulation |
| Cathode | Banded end | Connected to higher-potential node; defines regulated output voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N52xx standard for voltage regulation and interchangeability |
| Tight thermal resistance | 250°C/W junction-to-lead enables reliable operation without heatsinking at full power |
| Radiation-hardened | Inherently radiation tolerant per MicroNote 050, validated for space-grade applications |
| ESD-insensitive | No special handling required-immune to MIL-STD-750 Method 1020 ESD stress |
| Low capacitance | Typical <2 pF at 0 V (per Figure 2), preserving signal integrity in high-frequency bias networks |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 13 V threshold for error amplifier comparison. Use Value: ±10% VZ tolerance and +0.079%/°C tempco ensure <±2% output drift over –40°C to +85°C ambient. | Use Scenario: Placed across sensitive input rails (e.g., MCU I/O pins) to limit transient overvoltage. IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts above 13 V to divert surge current. Use Value: Low ZZT (13 Ω) ensures clamping voltage stays within safe margin even at 50 mA surge. |
| Reference Voltage Source | Current Source Bias |
Use Scenario: Provides stable 13 V reference for analog sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Precision Zener reference replacing IC-based references where cost and simplicity are critical. Use Value: Hermetic DO-35 package ensures long-term stability and low drift in harsh environments. | Use Scenario: Biases constant-current sources in LED drivers or op-amp bias networks. IC Role / Device Role / Timing Role: Sets base voltage for transistor-based current mirrors or emitter-degenerated sources. Use Value: Minimal capacitance (<2 pF) avoids phase shift in high-speed current loop compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, ±5% tolerance, 1.0 W power rating, DO-41 package | Higher power and tighter tolerance but larger footprint and different thermal profile | Select when >500 mW dissipation or ±5% VZ is required; verify PCB pad and trace thermal design |
| BZX55C13 | 13 V nominal, ±5% tolerance, 500 mW, DO-35 package, RoHS-only, no military screening options | Lacks JAN/JANTXV screening variants and internal bond options; not radiation-hardened | Choose for commercial-grade cost-sensitive designs where radiation hardness and MIL-spec screening are unnecessary |
Compared with 1N4742A and BZX55C13, the 1N5243A/TR offers unique value in high-reliability, high-temperature, and radiation-exposed applications due to its hermetic DO-35 construction, MIL-PRF-19500 screening capability, and documented radiation hardness-features absent in both alternatives.
Availability
1N5243A/TR is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and precision reference voltage generation requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for 1N5243A/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-temperature analog and mixed-signal components.
The 1N52xx series was designed specifically for ruggedized voltage regulation in aerospace, defense, oil & gas, and industrial control systems where long-term stability, wide temperature operation, and MIL-spec compliance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N5243A/TR?
The "A" suffix in 1N5243A/TR denotes ±10% Zener voltage tolerance, meaning the measured VZ at 9.5 mA test current falls between 11.7 V and 14.3 V. This is confirmed in the Electrical Characteristics table on page 1 of the Microsemi datasheet, where "A & B Suffix Only" columns specify tolerance bands for each part number.
Does 1N5243A/TR support military-grade screening?
Yes - 1N5243A/TR can be ordered with MIL-PRF-19500 screening levels (JAN, JANTX, JANTXV, JANS) by adding MQ, MX, MV, or MSP prefixes respectively, provided the part also carries the "-1" internal bond suffix. The base 1N5243A/TR itself is commercial-grade but fully compatible with these upgrade paths per Microsemi's Features section.
What is the maximum reverse leakage current for 1N5243A/TR?
The maximum reverse leakage current (IR) for 1N5243A/TR is 10 μA at VR = 10.4 V (80% of nominal VZ). This value is explicitly listed in the "IR @ VR Used For Suffix A" column for row 1N5243 in the Electrical Characteristics table, and applies to all A-suffix parts in the 1N52xx family.
Is 1N5243A/TR RoHS compliant?
Yes - the "TR" suffix indicates tape-and-reel packaging per EIA-296, and RoHS compliance is achieved by adding the "e3" suffix (e.g., 1N5243Ae3/TR). The base 1N5243A/TR uses standard tin-lead plating; RoHS-compliant versions use annealed matte-tin plating per MIL-STD-750 Method 2026, as stated in the Mechanical and Packaging section.
What is the thermal resistance of 1N5243A/TR in typical PCB mounting?
When mounted on an FR4 PCB with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm traces, the thermal resistance of 1N5243A/TR is 310°C/W junction-to-ambient. At 25°C ambient, this limits steady-state power dissipation to 0.48 W - a critical constraint for continuous operation in enclosed or high-ambient environments.
1N5243A/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):
- 13 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 13 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 9.4 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)
1N5243A/TR FAQ
1.How can I place an order for 1N5243A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5243A/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 1N5243A/TR reliable?
The price and inventory of 1N5243A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5243A/TR is usually 5 days.
3.What payment methods are accepted for 1N5243A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5243A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5243A/TR?
1N5243A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5243A/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 1N5243A/TR?
For technical support, including 1N5243A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5243A/TR requirements.
6.How does Aetrix verify that 1N5243A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5243A/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 1N5243A/TR meets industry standards.
7.What is the process for return or replacement of 1N5243A/TR?
All 1N5243A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5243A/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 1N5243A/TR part is unused and in its original packaging.
Return procedure for 1N5243A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5243A/TR Tags
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MM5Z5V1ST1G
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