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Microchip Technology 1N5243B
- Part No.:
- 1N5243B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5243B.pdf
- Description:
- DIODE ZENER 13V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,039
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Product details
Overview
1N5243B from Microsemi is a 13 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 9.5 mA test current and 13 Ω dynamic impedance at IZT, used for precision voltage regulation in low-power analog reference and bias circuits.
For engineers reviewing the 1N5243B datasheet, 1N5243B pinout, 1N5243B application, or 1N5243B equivalent, this page delivers verified electrical specs, thermal derating behavior, temperature coefficient, packaging details, and direct alternatives for stable voltage reference design in industrial control, power supply feedback, and sensor conditioning.
Technical Context
The 1N5243B operates as a two-terminal reverse-biased voltage reference with sharp breakdown knee, specified at 9.5 mA test current and characterized over −65°C to +175°C. Its zener impedance of 13 Ω at IZT and 0.5 Ω at IZK = 0.25 mA ensures stable regulation under varying load conditions.
Temperature coefficient is +0.079 %/°C (measured from 25°C to 125°C at rated IZT), and maximum reverse leakage is 10 μA at VR = 10.4 V. It features hermetically sealed glass construction with tin-lead or RoHS-compliant matte-tin plating, and cathode polarity marked by band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 13 V ±5% - defines regulated output level for reference/biasing circuits |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous power handling before thermal derating |
| Zener Test Current | 9.5 mA - operating point where VZ and ZZT are guaranteed per JEDEC |
| Dynamic Impedance | 13 Ω at IZT - low AC impedance ensures minimal output voltage variation with load transients |
| Temp. Coefficient | +0.079 %/°C - quantifies VZ drift over temperature; critical for high-stability references |
| Max Reverse Leakage | 10 μA at 10.4 V - determines minimum regulation current threshold and standby power loss |
| Forward Voltage | ≤1.5 V at 200 mA - defines conduction behavior if forward-biased accidentally |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package: hermetically sealed cylindrical glass body with tinned copper alloy leads, cathode indicated by single black band; total weight 0.2 g; lead length ≥10 mm for thermal rating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; must be negative relative to cathode for Zener operation |
| Cathode | Banded end | Connected to higher-potential node; regulates voltage across terminals when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Industry-standard qualification ensuring interchangeability and traceable parametric limits |
| ±5% Zener voltage tolerance (B suffix) | Guaranteed VZ window of 12.35–13.65 V supports tighter analog reference designs vs. ±10% A-suffix parts |
| Low dynamic impedance (13 Ω) | Minimizes output voltage deviation under changing load currents in feedback networks |
| Radiation-hardened construction | Inherent hardness per MicroNote 050 enables use in aerospace and defense systems without additional shielding |
| ESD-insensitive (MIL-STD-750 Method 1020) | Eliminates need for external ESD protection during board assembly and handling |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Provides stable 13 V reference to bias input stages of precision instrumentation amplifiers in data acquisition modules. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing DC operating point for analog signal conditioning circuitry. Use Value: ±5% tolerance and +0.079 %/°C TC enable <±1% total error over −40°C to +85°C ambient, meeting industrial-grade accuracy requirements. | Use Scenario: Clamps transient overvoltage on 12 V sensor supply rail to protect downstream ADC inputs from damage. IC Role / Device Role / Timing Role: Shunt protection device conducting excess energy to ground when rail exceeds 13 V nominal breakdown. Use Value: 500 mW power rating and 13 Ω dynamic impedance allow safe dissipation of short-duration surges while limiting clamped voltage to ≤13.5 V. |
| Feedback Regulation in Linear Power Supplies | Reference Node Stabilization in PLC I/O Modules |
Use Scenario: Sets regulated output voltage in discrete transistor-based linear regulators via resistive divider into pass transistor base. IC Role / Device Role / Timing Role: Precision shunt reference defining setpoint for closed-loop analog voltage control loop. Use Value: Sharp breakdown knee and low ZZT ensure stable regulation even with variable load currents up to 20 mA. | Use Scenario: Stabilizes 13 V reference node powering isolated analog input channel circuitry in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Passive voltage anchor maintaining consistent bias for signal isolation and level-shifting components. Use Value: Hermetic DO-35 package and −65°C to +175°C operating range support long-term reliability in harsh industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A (ON Semiconductor) | 12 V nominal, ±5%, 1 W power rating, DO-41 package, 22 Ω ZZT | Higher power and larger package; requires PCB layout change and heatsinking for same thermal performance | Select when >500 mW dissipation or higher surge robustness is required; not drop-in due to different VZ and package |
| BZX55C13 (Vishay) | 13 V nominal, ±5%, 500 mW, DO-35 package, 20 Ω ZZT, −65°C to +175°C | Identical voltage and package; slightly higher dynamic impedance affects regulation tightness under fast load steps | Valid alternative for space-constrained boards needing same footprint; verify ZZT impact on system stability |
Compared with 1N5243B, the 1N4742A offers higher power but differs in voltage and package, requiring redesign; the BZX55C13 matches voltage and DO-35 form factor but has 54% higher ZZT, potentially affecting regulation accuracy in dynamic loads.
Availability
1N5243B is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and analog biasing applications requiring stable component supply, long-term obsolescence management, and traceable sourcing for industrial automation, test equipment, and embedded control systems.
Supply support for 1N5243B 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 analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N52xxB series was designed for precision, low-power voltage regulation in mission-critical analog subsystems where stability, temperature resilience, and JEDEC standardization are mandatory.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5243B?
The 1N5243B has a nominal Zener voltage of 13 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 12.35 V and 13.65 V at 9.5 mA test current and 25°C. This tolerance is confirmed by the "B" suffix per JEDEC standard and applies across the full operating temperature range of −65°C to +175°C.
What is the maximum power dissipation and thermal derating behavior of the 1N5243B?
The 1N5243B is rated for 500 mW at 25°C ambient or lead temperature (TL < 50°C at 10 mm from body). Power must be linearly derated above 25°C at 4.0 mW/°C (250 °C/W junction-to-lead thermal resistance), reaching zero dissipation at 150°C TL. Mounting on FR4 with 4 mm² copper pads reduces derating margin due to higher junction-to-ambient resistance.
Does the 1N5243B have a specified temperature coefficient, and how is it measured?
Yes, the 1N5243B has a temperature coefficient of +0.079 %/°C, measured between 25°C and 125°C at its rated test current (9.5 mA). This value reflects the average rate of Zener voltage change per degree Celsius and is critical for predicting regulation drift in wide-temperature applications such as automotive engine control or outdoor industrial sensors.
What packaging and marking details apply to the 1N5243B?
1N5243B uses a DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with tin-lead or RoHS-compliant matte-tin plating. The cathode is marked by a single black band on the glass body, and the full part number "1N5243B" is laser-marked or etched on the surface. Weight is 0.2 g, and lead diameter is 0.46 mm (0.018 in).
Is the 1N5243B suitable for high-reliability or radiation-exposed environments?
Yes, the 1N5243B is inherently radiation-hardened per MicroNote 050 and qualified to MIL-PRF-19500 screening levels (e.g., JAN, JANTXV) when ordered with appropriate prefixes. Its glass-body construction, ESD insensitivity (MIL-STD-750 Method 1020), and extended temperature range make it suitable for aerospace, defense, and nuclear instrumentation applications where long-term parametric stability is essential.
1N5243B 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):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 13 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 9.9 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)
1N5243B FAQ
1.How can I place an order for 1N5243B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5243B 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 1N5243B reliable?
The price and inventory of 1N5243B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5243B is usually 5 days.
3.What payment methods are accepted for 1N5243B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5243B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5243B?
1N5243B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5243B 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 1N5243B?
For technical support, including 1N5243B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5243B requirements.
6.How does Aetrix verify that 1N5243B is sourced from the original manufacturer or authorized distributors?
All 1N5243B 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 1N5243B meets industry standards.
7.What is the process for return or replacement of 1N5243B?
All 1N5243B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5243B, 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 1N5243B part is unused and in its original packaging.
Return procedure for 1N5243B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5243B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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