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Microchip Technology 1N5348B/TR8
- Part No.:
- 1N5348B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5348B/TR8.pdf
- Description:
- DIODE ZENER 11V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,868
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Product details
Overview
1N5348B/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 11 V, ±5% tolerance (B suffix), 2.5 Ω maximum dynamic impedance at 125 mA test current, and 430 Ω maximum dynamic knee impedance at 1.0 mA. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5348B/TR8 datasheet, 1N5348B/TR8 pinout, 1N5348B/TR8 application, or 1N5348B/TR8 equivalent, key selection criteria include Zener voltage stability under varying load currents, thermal resistance (25 °C/W junction-to-lead), surge current capability (8.0 A), and RoHS-compliant tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode functions as a two-terminal voltage regulator by maintaining a stable reverse-biased breakdown voltage across its cathode–anode terminals. Its regulation performance is defined by ΔVZ = 0.25 V (difference between voltages at 10% and 50% of IZM) and low dynamic impedance (2.5 Ω at IZT = 125 mA), enabling tight voltage control in feedback loops.
Designed for high-reliability axial mounting, it features moisture sensitivity level 1 (no dry pack required), UL94V-0 epoxy encapsulation, and withstands 8.3 ms half-sine surge currents up to 8.0 A. Polarity is marked by a cathode band; operation requires the banded end to be positive relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V ±5% - stable regulation point for 12 V rail clamping or reference generation |
| Test Current (IZT) | 125 mA - defines operating point where VZ and ZZ are specified |
| Dynamic Impedance (ZZ) | 2.5 Ω max at 125 mA - ensures minimal output voltage shift under load transients |
| Max Regulator Current (IZM) | 430 mA - maximum continuous DC current at 25 °C with adequate heat sinking |
| Surge Current (IZSM) | 8.0 A peak (8.3 ms half-sine) - supports transient overvoltage suppression without failure |
| Voltage Regulation (ΔVZ) | 0.25 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables 5 W dissipation with modest heatsinking |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free thermosetting epoxy, UL94V-0), cathode indicated by band, RoHS-compliant matte-tin plated leads solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher potential; reverse-biased terminal where stable VZ develops |
| Anode (unbanded end) | Reference/return node | Connected to lower potential or ground; completes bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Industry-standard axial package with validated thermal and electrical performance |
| ±5% voltage tolerance (B suffix) | Enables tighter regulation than ±10% (A) or ±20% (no suffix) variants in cost-sensitive designs |
| Moisture Sensitivity Level 1 | No dry pack or baking required before PCB assembly, reducing manufacturing overhead |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling during board assembly and testing |
| RoHS-compliant (e3 suffix) | Meets global environmental compliance requirements without performance trade-offs |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Zener diode provides precise 11 V reference to optocoupler input, closing regulation loop. Use Value: Low ΔVZ (0.25 V) and 2.5 Ω ZZ ensure <±1% output voltage drift across line/load variations. | Use Scenario: Clamping induced transients on 12 V automotive accessory rails during load dump events. IC Role / Device Role / Timing Role: Shunts excess energy to ground when rail exceeds 11 V, protecting downstream ICs. Use Value: 8.0 A surge rating and 5 W steady-state dissipation handle ISO 7637-2 Pulse 5a without degradation. |
| Programmable Voltage Reference | Temperature-Stable Bias Network |
Use Scenario: Setting threshold voltage for comparator-based battery charge termination in industrial UPS systems. IC Role / Device Role / Timing Role: Provides fixed 11 V reference against which battery voltage is compared. Use Value: Specified VZ drift over –65 °C to +150 °C ensures consistent trip points across environmental extremes. | Use Scenario: Establishing stable bias current for linear regulator pass transistors in telecom base station power modules. IC Role / Device Role / Timing Role: Zener sets reference voltage for emitter-follower bias network. Use Value: Low thermal resistance (25 °C/W) minimizes self-heating-induced VZ drift during sustained 430 mA operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5348B (bulk) | Identical electrical specs; differs only in packaging (TR8 = tape-and-reel, bulk has no reel) | No functional difference; TR8 enables automated pick-and-place, bulk suits manual prototyping | Select 1N5348B/TR8 for SMT production; choose bulk for lab validation or low-volume hand assembly |
| MMBZ5240BS-7-F (Diodes Inc.) | Surface-mount SOD-123 package, 10 V nominal, ±5%, 225 mW PD; not a direct replacement due to power and package mismatch | Only suitable for low-power signal-level referencing, not 5 W regulation or surge clamping | Use MMBZ5240BS-7-F only in space-constrained, low-current applications where 5 W dissipation is unnecessary |
Compared with 1N5348B/TR8, the bulk variant offers identical regulation performance but lacks tape-and-reel logistics; the MMBZ5240BS-7-F provides surface-mount convenience at the cost of 95% lower power handling and incompatible thermal design margins.
Availability
1N5348B/TR8 is available at Aetrix Electronics and suitable for industrial power supply regulation, overvoltage protection circuits, and programmable voltage reference designs requiring stable component supply and full traceability.
Supply support for 1N5348B/TR8 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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and JEDEC-standardized axial form factor compatibility.
FAQ
What is the Zener voltage tolerance for 1N5348B/TR8?
The 1N5348B/TR8 has a nominal Zener voltage of 11 V with a tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This tolerance applies across the full operating temperature range of –65 °C to +150 °C and is verified at 25 °C lead temperature using 125 mA test current. The 1N5348B/TR8 does not support tighter tolerances like ±2% (C) or ±1% (D) - those require different suffixes.
Can 1N5348B/TR8 be used in surface-mount designs?
No, the 1N5348B/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. Microsemi offers surface-mount equivalents such as SMBJ5348B for SMC packages or SMBG5348B for SMB packages, but these differ mechanically and thermally from the 1N5348B/TR8. Substituting them requires PCB layout changes and thermal redesign.
What is the maximum surge current rating for 1N5348B/TR8?
The 1N5348B/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 8.0 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating assumes proper lead mounting (3/8″ from body) and is validated per JEDEC standards. Exceeding this value risks irreversible junction damage, even if average power remains within 5 W limits.
How does thermal resistance affect 1N5348B/TR8 performance in PCB-mounted applications?
When mounted on FR4 with 1 oz copper and specified pad geometry, the 1N5348B/TR8 exhibits 85 °C/W junction-to-ambient thermal resistance, limiting steady-state power to 1.47 W at 25 °C ambient. For full 5 W operation, the 1N5348B/TR8 must be heatsinked to achieve the 25 °C/W junction-to-lead rating - otherwise, junction temperature rise will exceed safe limits and cause VZ drift or failure.
Is 1N5348B/TR8 RoHS compliant?
Yes, the 1N5348B/TR8 carries the "e3" suffix per Microsemi's documentation, confirming RoHS compliance with lead-free matte-tin plating on annealed copper leads. It meets J-STD-020B moisture sensitivity level 1 and requires no dry-pack preconditioning prior to reflow soldering at 260 °C for 10 seconds maximum.
1N5348B/TR8 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/TR8 FAQ
1.How can I place an order for 1N5348B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5348B/TR8 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/TR8 reliable?
The price and inventory of 1N5348B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5348B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5348B/TR8?
1N5348B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5348B/TR8 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/TR8?
For technical support, including 1N5348B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348B/TR8 requirements.
6.How does Aetrix verify that 1N5348B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5348B/TR8 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/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5348B/TR8?
All 1N5348B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348B/TR8, 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/TR8 part is unused and in its original packaging.
Return procedure for 1N5348B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5348B/TR8 Tags
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MM5Z5V1ST1G
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