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Microchip Technology 1N5348/TR12
- Part No.:
- 1N5348/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5348/TR12.pdf
- Description:
- DIODE ZENER 11V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
1N5348/TR12 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 430 Ω maximum knee impedance at 1 mA. 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 1N5348/TR12 datasheet, 1N5348/TR12 pinout, 1N5348/TR12 application, or 1N5348/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (8.0 A), voltage regulation (ΔVZ = 0.25 V), and RoHS-compliant tape-and-reel packaging (TR12 suffix).
Technical Context
This device functions as a two-terminal voltage regulator in reverse-bias mode, where the cathode band denotes the positive terminal during regulation. Its low dynamic impedance ensures stable output under varying load currents, and its 25 °C/W thermal resistance enables reliable 5 W operation with minimal lead-length heat sinking.
The 1N5348/TR12 meets JEDEC 1N53xxB registration requirements and supports MIL-PRF-19500 screening when prefixed (e.g., MQ1N5348B). It is moisture-sensitive Level 1 per J-STD-020B and requires no dry pack prior to soldering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V ±5% - defines precise regulation point for feedback networks and reference circuits |
| Test Current (IZT) | 125 mA - operating point at which VZ and ZZ are specified; sets minimum bias requirement |
| Dynamic Impedance (ZZ) | 2.5 Ω max - determines output voltage variation under load transients; critical for low-noise references |
| Max Regulator Current (IZM) | 430 mA - maximum continuous DC current at 25 °C lead temperature; defines upper power limit |
| Surge Current (IZSM) | 8.0 A - peak non-repetitive half-sine (8.3 ms) capability; enables transient overvoltage clamping |
| Voltage Regulation (ΔVZ) | 0.25 V - difference between VZ measured at 10% and 50% of IZM; quantifies regulation linearity |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead value at 3/8″ (10 mm) lead length; guides heatsinking design |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free thermosetting epoxy, UL94V-0 rated), cathode indicated by colored band. Leads are tin-lead or RoHS-compliant matte-tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference node | Connected to circuit ground or lower-potential rail; forms return path during regulation |
| Cathode | Zener voltage output node | Banded end; supplies regulated 11 V to feedback divider or clamp load; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized electrical behavior and interchangeability across qualified suppliers |
| ±5% voltage tolerance (B suffix) | Enables tighter feedback loop control vs. ±10% or ±20% variants without requiring calibration |
| RoHS-compliant (e3) and tape-and-reel (TR12) | Supports automated SMT placement and environmental compliance for industrial production |
| Level 1 moisture sensitivity | Eliminates bake-out requirement before reflow, reducing manufacturing overhead and risk of damage |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for special ESD workstations in assembly |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback network of an isolated 12 V DC-DC converter to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element providing stable 11 V threshold to drive optocoupler LED. Use Value: Maintains ±1.5% output regulation across line/load/temperature due to low ΔVZ (0.25 V) and stable ZZ. | Use Scenario: Placed across a 12 V automotive microcontroller's VCC rail to suppress load-dump transients. IC Role / Device Role / Timing Role: Shunt clamping device that conducts above 11 V to divert surge energy to ground. Use Value: Withstands 8.0 A (8.3 ms) surge without degradation, protecting downstream ICs per ISO 7637-2. |
| Programmable Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Paired with a precision resistor to generate a stable 11 V reference for ADC input scaling in a data acquisition module. IC Role / Device Role / Timing Role: Primary voltage reference source with minimal drift over –40 °C to +85 °C ambient. Use Value: Delivers <0.5% total error over temperature due to tight ±5% initial tolerance and low thermal coefficient. | Use Scenario: Supplies excitation voltage to a 4–20 mA pressure transducer bridge in a factory automation PLC input card. IC Role / Device Role / Timing Role: Stable bias source ensuring linear sensor output independent of supply ripple. Use Value: Low 2.5 Ω ZZ minimizes output impedance, preventing loading-induced gain error in ratiometric measurements. |
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 but supplied in bulk packaging (no TR12 tape/reel); same T-18 package and B-suffix tolerance | No automated placement support; suitable for hand-soldered prototypes or low-volume repair | Select 1N5348/TR12 for high-volume SMT lines; choose 1N5348B only if reel packaging is unnecessary |
| MMBZ5242B (SOT-23) | Same 11 V ±5%, but 0.35 W rating, 30 Ω ZZ, and surface-mount package; not a drop-in replacement | Limited to low-power signal-level regulation; cannot replace 1N5348/TR12 in 5 W power applications | Use MMBZ5242B only in space-constrained, low-current designs where thermal dissipation is <0.5 W |
Compared with 1N5348B and MMBZ5242B, the 1N5348/TR12 uniquely combines 5 W power handling, axial-leaded mechanical robustness, and TR12 tape-and-reel compatibility-making it optimal for industrial power supply manufacturing where reliability, thermal margin, and automated assembly coexist.
Availability
1N5348/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and industrial sensor excitation systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N5348/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 and mixed-signal components 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 stability, surge resilience, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N5348/TR12?
The 1N5348/TR12 has a ±5% Zener voltage tolerance, confirmed by the "B" suffix in its full part number per Microsemi's datasheet. This means its actual regulation voltage falls within 10.45 V to 11.55 V at 125 mA test current and 25 °C lead temperature. The tolerance is guaranteed across the full operating temperature range of –65 °C to +150 °C, and the 1N5348/TR12 is tested and binned accordingly before shipment.
Can the 1N5348/TR12 be used in surface-mount designs?
No-the 1N5348/TR12 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 and sharing identical 11 V ±5% regulation. The 1N5348/TR12 requires through-hole mounting with ≥10 mm lead length from body for proper thermal derating per datasheet Figure 1.
What is the maximum steady-state power dissipation of the 1N5348/TR12 on a standard PCB?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5348/TR12 has a steady-state power rating of 1.47 W at 25 °C ambient, per Microsemi's thermal resistance specification of 85 °C/W junction-to-ambient. This is significantly lower than its 5 W rating at 25 °C lead temperature, underscoring the need for adequate heatsinking or lead-length optimization in high-power applications.
Does the 1N5348/TR12 require baking before reflow soldering?
No-the 1N5348/TR12 has IPC/JEDEC moisture sensitivity level (MSL) 1, meaning it is not moisture-sensitive and does not require dry-packaging or pre-reflow baking. Its void-free epoxy encapsulation and Level 1 classification allow direct placement into reflow ovens at up to 260 °C for 10 seconds, per MIL-STD-750 Method 2026, without risk of popcorning or delamination.
How is polarity marked on the 1N5348/TR12?
The 1N5348/TR12 uses a cathode band-typically a single colored stripe near one end of the cylindrical body-to indicate polarity. During voltage regulation, the banded end (cathode) must be held positive relative to the unmarked end (anode). This marking is consistent across all 1N53xxB devices and is verified in Microsemi's package drawings and mechanical specifications on page 3 of the datasheet.
1N5348/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:
- ±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/TR12 FAQ
1.How can I place an order for 1N5348/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5348/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 1N5348/TR12 reliable?
The price and inventory of 1N5348/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5348/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5348/TR12?
1N5348/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5348/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 1N5348/TR12?
For technical support, including 1N5348/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348/TR12 requirements.
6.How does Aetrix verify that 1N5348/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5348/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 1N5348/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5348/TR12?
All 1N5348/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348/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 1N5348/TR12 part is unused and in its original packaging.
Return procedure for 1N5348/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5348/TR12 Tags
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