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Microchip Technology 1N5242B/TR
- Part No.:
- 1N5242B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5242B/TR.pdf
- Description:
- DIODE ZENER 12V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,699
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Product details
Overview
1N5242B/TR from Microsemi is a 12 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current, 30 Ω dynamic impedance at IZT, and -65°C to +175°C operating temperature range. It provides stable voltage regulation in low-power reference and protection circuits.
For engineers reviewing the 1N5242B/TR datasheet, 1N5242B/TR pinout, 1N5242B/TR application, or 1N5242B/TR equivalent, key selection criteria include Zener voltage accuracy, thermal stability across industrial temperature extremes, low dynamic impedance for tight regulation, and RoHS-compliant tape-and-reel availability with TR suffix.
Technical Context
This device operates as a reverse-biased voltage reference with a sharp breakdown knee verified by dual-point Zener impedance measurement per MicroNote 202. Its 12 V nominal Zener voltage exhibits +0.077%/°C temperature coefficient over 25°C–125°C, measured at 7.5 mA.
The DO-35 package delivers 250°C/W junction-to-lead thermal resistance at 10 mm lead length and supports 0.5 W steady-state dissipation below 50°C lead temperature. Forward voltage remains ≤1.5 V at 200 mA, confirming robust conduction capability during transient clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 12 V ±5% - precise mid-range reference for analog sensing and power rail stabilization |
| Power Dissipation (PD) | 500 mW at 25°C - supports continuous regulation in compact, non-heatsinked PCB layouts |
| Zener Impedance (ZZT) | 30 Ω at 20 mA - ensures minimal output voltage shift under load variation |
| Test Current (IZT) | 20 mA - standard bias point for guaranteed VZ and ZZT specification compliance |
| Operating Temperature | -65°C to +175°C - validated for aerospace, downhole, and high-temp industrial environments |
| Thermal Resistance (RθJL) | 250°C/W - enables accurate junction temperature estimation from lead temperature measurements |
Pinout & Package
Hermetically sealed DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by color band; banded end must be held positive relative to anode for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; establishes polarity for reverse-bias regulation |
| Cathode (banded end) | Zener output terminal | Provides regulated 12 V when reverse-biased; must be driven positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Industry-standard footprint and electrical behavior-ensures design reuse and supply chain compatibility |
| RoHS-compliant "e3" variant available | Meets EU environmental directives without performance trade-offs; tin-lead plating optional |
| Low capacitance (typ. <1.5 pF) | Minimizes high-frequency signal coupling in RF and precision timing circuits |
| Radiation-hardened per MicroNote 050 | Validated for total ionizing dose (TID) resilience in space and nuclear applications |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during assembly; improves manufacturing yield |
Applications
| Industrial Sensor Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 12 V reference for 4–20 mA transmitter front-end op-amps in process control systems. IC Role / Device Role / Timing Role: Precision voltage reference source for analog signal conditioning circuitry. Use Value: ±5% tolerance and +0.077%/°C tempco ensure <±1.2% total error over -40°C to +85°C ambient. |
Use Scenario: Clamping microcontroller I/O lines against ESD transients in factory automation HMI panels. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting CMOS inputs from >1 kV HBM events. Use Value: 500 mW rating and low ZZT enable fast response with minimal voltage overshoot during surge events. |
| Aerospace Power Monitor | Legacy Equipment Voltage Regulator |
Use Scenario: Monitoring 28 V aircraft bus voltage via resistive divider into ADC, using 1N5242B/TR as local 12 V reference. IC Role / Device Role / Timing Role: High-reliability reference diode in radiation-exposed avionics subsystems. Use Value: Inherent radiation hardness and -65°C to +175°C rating support MIL-PRF-19500 screening options (e.g., JANTXV). |
Use Scenario: Replacing obsolete 12 V Zeners in maintenance of legacy telecom power supplies. IC Role / Device Role / Timing Role: Drop-in replacement for DO-35-based 12 V regulation in field-serviceable equipment. Use Value: Identical mechanical dimensions and electrical specs allow direct substitution without board rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A (ON Semiconductor) | Same 12 V ±5%, but DO-41 package (larger body, higher PD = 1 W), 22 Ω ZZT | Better suited for higher-power dissipation; requires PCB pad revision due to larger outline | Select when thermal margin >500 mW is required and board layout allows DO-41 footprint |
| BZX55C12 (Vishay) | 12 V ±5%, DO-35 package, but 500 mW rating, 30 Ω ZZT, -65°C to +175°C range | Functionally identical performance and form factor; RoHS-compliant standard offering | Preferred for new designs requiring full RoHS compliance without "e3" suffix negotiation |
Compared with 1N5242B/TR, the 1N4742A offers higher power headroom at the cost of larger size, while the BZX55C12 matches all critical electrical and mechanical parameters with broader global distribution and simplified compliance documentation.
Availability
1N5242B/TR is available at Aetrix Electronics and suitable for industrial sensor references, overvoltage clamping, and aerospace power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N5242B/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 1N52xxB series was designed for mission-critical voltage reference and protection in aerospace, defense, oil & gas, and industrial control systems where long-term parametric stability and extreme environment survivability are mandatory.
FAQ
What is the Zener voltage tolerance and test condition for 1N5242B/TR?
The 1N5242B/TR has a nominal Zener voltage of 12 V with ±5% tolerance, specified at 20 mA test current (IZT) and 25°C ambient temperature. This tolerance is guaranteed per JEDEC standard for the "B" suffix, and the device is tested with dual-point Zener impedance verification to ensure a sharp breakdown knee.
Does 1N5242B/TR support RoHS compliance?
Yes - the 1N5242B/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5242B-e3/TR). Standard versions use tin-lead plating per MIL-STD-750 Method 2026, while e3 variants use annealed matte-tin plating meeting EU Directive 2011/65/EU requirements.
What is the maximum operating temperature range for 1N5242B/TR?
The 1N5242B/TR is rated for continuous operation from -65°C to +175°C, verified per MIL-PRF-19500 thermal stress testing. Its hermetically sealed DO-35 glass package and internal construction maintain parameter stability across this full range without derating until above 50°C lead temperature.
How does the temperature coefficient of 1N5242B/TR affect its regulation accuracy?
The 1N5242B/TR exhibits a +0.077%/°C temperature coefficient (αVZ) over 25°C–125°C, measured at 7.5 mA. This means its Zener voltage increases by ~9.2 mV per °C rise - a predictable drift that can be compensated in precision references or accepted in less sensitive clamping applications.
Can 1N5242B/TR be used as a direct replacement for older 1N5242 or 1N5242A parts?
Yes - the 1N5242B/TR replaces earlier 1N5242 (no suffix) and 1N5242A variants with tighter ±5% tolerance and improved Zener impedance consistency. All share identical DO-35 package, pinout, and thermal characteristics, enabling drop-in substitution in legacy designs without layout changes.
1N5242B/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):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.1 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)
1N5242B/TR FAQ
1.How can I place an order for 1N5242B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5242B/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 1N5242B/TR reliable?
The price and inventory of 1N5242B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5242B/TR is usually 5 days.
3.What payment methods are accepted for 1N5242B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5242B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5242B/TR?
1N5242B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5242B/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 1N5242B/TR?
For technical support, including 1N5242B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5242B/TR requirements.
6.How does Aetrix verify that 1N5242B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5242B/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 1N5242B/TR meets industry standards.
7.What is the process for return or replacement of 1N5242B/TR?
All 1N5242B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5242B/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 1N5242B/TR part is unused and in its original packaging.
Return procedure for 1N5242B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5242B/TR 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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