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Microchip Technology 1N5348B/TR12
- Part No.:
- 1N5348B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5348B/TR12.pdf
- Description:
- DIODE ZENER 11V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,080
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Product details
Overview
1N5348B/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 11 V ±5%, 125 mA test current (IZT), 2.5 Ω dynamic impedance (ZZ), and 8.0 V maximum reverse current (IR) at 8.0 V VR. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5348B/TR12 datasheet, 1N5348B/TR12 pinout, 1N5348B/TR12 application, or 1N5348B/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (8.0 A), voltage regulation (ΔVZ = 0.25 V), and RoHS-compliant e3 packaging with tape-and-reel delivery.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-biased mode, where the banded end serves as the cathode. Its low dynamic impedance (2.5 Ω) ensures stable regulation across 10–50% of IZM (125 mA), and its 25 °C/W thermal resistance enables reliable 5 W operation with 3/8″ lead length heat sinking.
The 1N5348B/TR12 meets JEDEC 1N53xxB registration requirements, features UL94V-0 epoxy encapsulation, and is rated for 260 °C soldering (10 s). It exhibits minimal voltage drift versus temperature and current-ΔVZ is specified at 0.25 V between 10% and 50% of IZM-supporting stable reference performance in industrial power circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V ±5% - precise regulation point for feedback networks requiring tight voltage setpoints |
| Test Current (IZT) | 125 mA - operating point at which VZ and ZZ are guaranteed per JEDEC spec |
| Dynamic Impedance (ZZ) | 2.5 Ω - low AC resistance ensures minimal output voltage variation under load transients |
| Max Reverse Current (IR) | 5.0 μA @ 8.0 V VR - confirms sharp knee and low leakage below regulation threshold |
| Max Regulator Current (IZM) | 8.0 A - peak non-repetitive surge capability for transient overvoltage suppression |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables full 5 W dissipation with simple lead-length heat sinking |
| Operating Temperature | –65 °C to +150 °C - supports deployment in extended-temperature industrial and aerospace environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-204AL), void-free UL94V-0 epoxy body, matte-tin plated leads, cathode indicated by band. Weight: 0.7 g. Moisture sensitivity level: IPC/JEDEC J-STD-020B Level 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded lead | Connected to lower-potential node in reverse-bias configuration; carries full regulated current |
| Cathode | Banded lead | Connected to higher-potential node; defines Zener breakdown voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| ±5% voltage tolerance (B suffix) | Enables accurate voltage setting without post-calibration in fixed-output supplies |
| 5.0 W steady-state power rating | Supports high-current shunt regulation in 12 V rail protection and reference applications |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during manual assembly or rework |
| RoHS-compliant e3 marking | Meets global environmental compliance requirements without derating or qualification delays |
| Tape-and-reel packaging (TR12 suffix) | Enables automated pick-and-place assembly with standard 12 mm carrier tape |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element providing stable 11 V threshold to drive TL431 or optocoupler LED. Use Value: Tight ±5% tolerance and low ΔVZ (0.25 V) maintain output regulation within ±1% over line/load variations. | Use Scenario: Placed across sensitive 12 V logic rails to clamp transient spikes above 11 V. IC Role / Device Role / Timing Role: Shunt clamping device diverting surge energy to ground before IC damage occurs. Use Value: 8.0 A surge rating (8.3 ms half-sine) absorbs IEC 61000-4-5 Level 4 surges without degradation. |
| Industrial Sensor Reference | Programmable Voltage Monitor |
Use Scenario: Supplies stable 11 V reference to analog front-end circuitry in pressure/temperature transmitters. IC Role / Device Role / Timing Role: Precision voltage source for ADC biasing and signal conditioning stages. Use Value: Low 2.5 Ω dynamic impedance minimizes reference error under varying sensor load currents. | Use Scenario: Configured with comparator to trigger shutdown when input exceeds 11 V threshold. IC Role / Device Role / Timing Role: Programmable trip-point element defining overvoltage detection level. Use Value: Guaranteed 11 V ±5% tolerance ensures repeatable, production-ready trip accuracy without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5348B (bulk) | Identical electrical specs; differs only in packaging (bulk vs. TR12 tape-and-reel) | No automated assembly support; requires manual or vibratory bowl feeding | Select for prototyping, low-volume builds, or hand-soldered repairs |
| MMSZ5242B-TP (Micro Commercial) | Surface-mount SOD-123 package; 11 V ±5%; 500 mW rating; 17 Ω ZZ | Limited to low-power applications; unsuitable for 5 W dissipation or surge clamping | Select only for space-constrained PCBs where power < 0.5 W and surge immunity is not required |
Compared with 1N5348B/TR12, the bulk variant offers identical performance but lacks tape-and-reel compatibility for SMT lines, while MMSZ5242B-TP trades power handling and surge robustness for miniaturization-making it unsuitable as a drop-in replacement in high-energy protection roles.
Availability
1N5348B/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom infrastructure equipment requiring stable component supply with RoHS compliance and JEDEC-standard reliability.
Supply support for 1N5348B/TR12 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 timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized, high-power Zener regulation in mission-critical power systems where long-term stability, surge resilience, and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5348B/TR12?
The 1N5348B/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This means its measured VZ at 125 mA test current falls between 10.45 V and 11.55 V at 25 °C. The tolerance is guaranteed across the full operating temperature range (–65 °C to +150 °C), and the 1N5348B/TR12 is JEDEC-registered to ensure consistency with industry-standard 1N53xxB specifications.
Does the 1N5348B/TR12 require dry packing for moisture sensitivity?
No, the 1N5348B/TR12 does not require dry packing. It is rated at IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1, meaning it can be stored indefinitely at ambient conditions without baking or humidity-controlled packaging. This simplifies inventory handling and eliminates pre-reflow baking steps during PCB assembly-confirmed in Microsemi's official datasheet revision D (2008).
What is the maximum surge current rating for the 1N5348B/TR12?
The 1N5348B/TR12 has a maximum non-repetitive surge current (IZSM) of 8.0 A, defined as the peak value of an 8.3 ms half-sine wave. This rating is validated under JEDEC test conditions and supports transient overvoltage suppression in 12 V systems. The 1N5348B/TR12 maintains parameter integrity after such events when operated within its thermal limits and mounted with appropriate lead length for heat dissipation.
Can the 1N5348B/TR12 be used in surface-mount designs?
No-the 1N5348B/TR12 is an axial-leaded T-18 (DO-204AL) package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5348B (SMB package) and SMBG5348B (SMBG package), both sharing identical electrical specs but differing in thermal performance and mounting method. The 1N5348B/TR12 must be mounted through-hole with ≥3/8″ (10 mm) lead length from body for full 5 W operation.
What does the "TR12" suffix indicate in 1N5348B/TR12?
"TR12" indicates tape-and-reel packaging per EIA-296 standard, using 12 mm carrier tape. This format enables automated pick-and-place placement in high-volume manufacturing. The "TR" denotes tape-and-reel, and "12" specifies tape width-not to be confused with reel quantity. All electrical and thermal characteristics of the 1N5348B/TR12 remain identical to the bulk 1N5348B; only packaging and delivery method differ.
1N5348B/TR12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- T-18
1N5348B/TR12 FAQ
1.How can I place an order for 1N5348B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5348B/TR12 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 1N5348B/TR12 reliable?
The price and inventory of 1N5348B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5348B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5348B/TR12?
1N5348B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5348B/TR12 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 1N5348B/TR12?
For technical support, including 1N5348B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348B/TR12 requirements.
6.How does Aetrix verify that 1N5348B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5348B/TR12 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 1N5348B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5348B/TR12?
All 1N5348B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348B/TR12, 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 1N5348B/TR12 part is unused and in its original packaging.
Return procedure for 1N5348B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5348B/TR12 Tags
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