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Microchip Technology 1N5348/TR8
- Part No.:
- 1N5348/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5348/TR8.pdf
- Description:
- DIODE ZENER 11V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,333
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Product details
Overview
1N5348/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 11 V, ±5% tolerance (B suffix), 2.5 Ω maximum dynamic impedance at 125 mA test current, and 8.0 A maximum surge current. It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N5348/TR8 datasheet, 1N5348/TR8 pinout, 1N5348/TR8 application, or 1N5348/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), steady-state power rating (5 W at TL < 25 °C), reverse leakage performance (5.0 µA at 8.0 V), and RoHS-compliant tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across varying load currents and temperatures. Its low dynamic impedance (2.5 Ω) ensures minimal voltage deviation under current changes, while its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with standard 3/8" lead length heat sinking.
The device features a void-free thermosetting epoxy T-18 package rated UL94V-0, cathode band polarity marking, and moisture sensitivity level 1 per J-STD-020B-eliminating dry pack requirements. It withstands 8.3 ms half-sine surge currents up to 8.0 A and exhibits ≤0.25 V voltage regulation (ΔVZ) between 10% and 50% of IZM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V nominal, ±5% tolerance - defines precise regulation point for feedback loops and reference rails |
| Test Current (IZT) | 125 mA - operating point where VZ and ZZ are specified; sets minimum bias requirement |
| Dynamic Impedance (ZZ) | 2.5 Ω max at 125 mA - determines output voltage stability under load transients |
| Max Reverse Leakage (IR) | 5.0 µA at 8.0 V - ensures low quiescent current in standby or high-impedance sensing paths |
| Power Dissipation (PD) | 5.0 W at 25 °C lead temperature - requires mechanical heat sinking for full-power operation |
| Surge Current (IZSM) | 8.0 A peak (8.3 ms half-sine) - supports transient overvoltage clamping without failure |
| Voltage Regulation (ΔVZ) | 0.25 V max - quantifies variation between 10% and 50% of max Zener current |
Pinout & Package
Package: T-18 axial-leaded plastic case (UL94V-0 epoxy), cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower potential node; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / regulation output | Banded end; connected to higher potential; delivers stable 11 V reference when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N53xxB series | Industry-standard footprint and electrical behavior enabling direct sourcing and design reuse |
| ±5% Zener voltage tolerance (B suffix) | Enables tighter regulation than ±10% (A) or ±20% (no suffix) variants in precision references |
| 25 °C/W junction-to-lead thermal resistance | Allows full 5 W dissipation with simple 3/8" lead-length heat sinking-no PCB copper pour required |
| Moisture Sensitivity Level 1 | Eliminates dry pack and bake-out steps during SMT assembly-compatible with standard handling |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and ESD protection circuitry in final systems |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing error amplifier reference in isolated flyback or forward converter feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 11 V reference to optocoupler input, enabling accurate secondary-side voltage regulation. Use Value: Low ΔVZ (0.25 V) and stable VZ over temperature ensure ±1% output voltage accuracy across -65 °C to +150 °C. | Use Scenario: Clamping transient surges on 12 V automotive or industrial control bus lines. IC Role / Device Role / Timing Role: Shunts excess energy to ground when line voltage exceeds 11 V, protecting downstream logic and sensors. Use Value: 8.0 A surge rating and robust epoxy package withstand repeated 8.3 ms transients without degradation. |
| Programmable Voltage Reference | Current Source Biasing |
Use Scenario: Setting threshold voltage for comparator-based battery monitoring or undervoltage lockout. IC Role / Device Role / Timing Role: Provides stable 11 V reference against which battery voltage is compared via resistor divider. Use Value: Tight ±5% tolerance and low 5.0 µA leakage at 8.0 V minimize threshold drift and false triggering. | Use Scenario: Biasing constant-current source for LED driver or sensor excitation circuit. IC Role / Device Role / Timing Role: Establishes fixed voltage drop across series resistor to generate regulated bias current. Use Value: 2.5 Ω dynamic impedance ensures current stability within ±2% over 10–125 mA operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5348B | No TR8 tape-and-reel suffix; bulk or ammo pack packaging | Same electrical specs and T-18 package; differs only in packaging format | Select 1N5348B for manual prototyping or low-volume hand-soldered builds |
| MMBZ5240B | Surface-mount SOT-23 package; 11 V, ±5%, 225 mW PD; higher ZZ (20 Ω) | Not suitable for 5 W power dissipation; limited to low-current bias/reference roles | Choose MMBZ5240B only for space-constrained PCBs where <250 mW regulation suffices |
Compared with 1N5348B and MMBZ5240B, the 1N5348/TR8 uniquely combines JEDEC-standard axial T-18 packaging, 5 W power handling, and ±5% voltage accuracy-making it optimal for through-hole power supply references requiring field-replaceability and thermal robustness.
Availability
1N5348/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage references requiring stable component supply and long-term obsolescence management.
Supply support for 1N5348/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, RF, and timing components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems-emphasizing thermal resilience, surge immunity, and JEDEC-standard interoperability.
FAQ
What is the Zener voltage tolerance of the 1N5348/TR8?
The 1N5348/TR8 has a ±5% Zener voltage tolerance, confirmed by the "B" suffix in its part number per Microsemi's datasheet. This means its measured regulation voltage falls between 10.45 V and 11.55 V at 125 mA test current and 25 °C lead temperature. The 1N5348/TR8 maintains this tolerance across its full operating temperature range of –65 °C to +150 °C, supporting stable performance in demanding environments.
Can the 1N5348/TR8 be used in surface-mount designs?
No-the 1N5348/TR8 uses an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5348B (DO-214AA) and SMBG5348B (DO-214AB), both rated for 5 W but requiring different PCB footprints and reflow profiles. The 1N5348/TR8 must be mounted through-hole with 3/8" lead length for rated thermal performance.
What is the maximum steady-state power dissipation of the 1N5348/TR8?
The 1N5348/TR8 delivers 5.0 W steady-state power dissipation when lead temperature (TL) is maintained below 25 °C using 3/8" (10 mm) lead length from the body. When mounted on FR4 with 1 oz copper, its derated power drops to 1.47 W at 25 °C ambient due to higher junction-to-ambient thermal resistance (85 °C/W). Full 5 W operation of the 1N5348/TR8 therefore requires external heat sinking or forced-air cooling.
Does the 1N5348/TR8 meet RoHS requirements?
Yes-the 1N5348/TR8 is RoHS compliant, as indicated by the "e3" suffix in Microsemi's official documentation. Its leads feature annealed matte-tin plating instead of tin-lead, satisfying EU Directive 2011/65/EU. The epoxy body meets UL94V-0 flammability standards, and the device carries no exemptions-making the 1N5348/TR8 suitable for environmentally regulated industrial and medical equipment.
How does the 1N5348/TR8 handle surge conditions?
The 1N5348/TR8 is rated for 8.0 A peak non-recurrent surge current (IZSM) in an 8.3 ms half-sine waveform, per JEDEC standard testing. This capability allows the 1N5348/TR8 to safely clamp repetitive transients such as load dump spikes in automotive 12 V systems or switching noise in industrial motor drives-without parameter shift or catastrophic failure-provided average power remains within 5 W limits.
1N5348/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:
- ±20%
- 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
1N5348/TR8 FAQ
1.How can I place an order for 1N5348/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5348/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 1N5348/TR8 reliable?
The price and inventory of 1N5348/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5348/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5348/TR8?
1N5348/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5348/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 1N5348/TR8?
For technical support, including 1N5348/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348/TR8 requirements.
6.How does Aetrix verify that 1N5348/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5348/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 1N5348/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5348/TR8?
All 1N5348/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348/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 1N5348/TR8 part is unused and in its original packaging.
Return procedure for 1N5348/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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