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Microchip Technology 1N5348A/TR12
- Part No.:
- 1N5348A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5348A/TR12.pdf
- Description:
- DIODE ZENER 11V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,223
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Product details
Overview
1N5348A/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 11 V, ±10% tolerance (A suffix), 2.5 Ω maximum dynamic impedance at 125 mA test current, and 8.0 A maximum surge current. It operates from –65 °C to +150 °C and is used for voltage reference and overvoltage protection in DC power supplies and analog circuitry.
For engineers reviewing the 1N5348A/TR12 datasheet, 1N5348A/TR12 pinout, 1N5348A/TR12 application, or 1N5348A/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power rating (5 W at TL < 25 °C), reverse leakage current (5.0 μA at 8.0 V), and RoHS-compliant plating option (e3 suffix).
Technical Context
This device functions as a two-terminal voltage regulator by operating in reverse breakdown, maintaining stable output voltage across a broad range of currents (125 mA IZT, up to 8.0 A IZSM). Its low thermal resistance (25 °C/W junction-to-lead) enables high-current operation when mounted with 3/8″ lead length from body.
It exhibits minimal voltage variation (ΔVZ = 0.25 V) between 10% and 50% of maximum Zener current and maintains tight dynamic impedance control (ZZ ≤ 2.5 Ω) under specified test conditions, supporting precision regulation in linear power supply feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V nominal, ±10% tolerance - defines regulated output voltage window (9.9–12.1 V) under specified test current |
| Test Current (IZT) | 125 mA - current at which VZ is measured; sets baseline operating point for regulation accuracy |
| Dynamic Impedance (ZZ) | ≤2.5 Ω at 125 mA - determines sensitivity of output voltage to current changes; lower value improves regulation stability |
| Max Surge Current (IZSM) | 8.0 A (8.3 ms half-sine) - defines single-event transient energy handling capability without failure |
| Reverse Leakage (IR) | 5.0 μA at 8.0 V - specifies off-state conduction level; critical for low-power bias networks |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables 5 W dissipation with ≤25 °C temperature rise above lead temperature |
| Power Dissipation (PD) | 5.0 W at TL < 25 °C - maximum continuous DC power under defined mounting condition |
Pinout & Package
Package: Axial-leaded T-18 plastic case per JEDEC DO-204AL; cathode indicated by band; RoHS-compliant matte-tin plating; weight 0.7 g; moisture sensitivity Level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side of circuit; establishes polarity for Zener operation |
| Cathode | Regulated output node / Breakdown voltage reference | Banded end; connected to higher-potential side; delivers stable 11 V reference when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized mechanical dimensions and electrical test methodology across manufacturers |
| ±10% voltage tolerance (A suffix) | Provides cost-optimized regulation accuracy suitable for non-critical reference applications |
| 5.0 W power rating with 25 °C/W RθJL | Supports high-current regulation without external heatsink when leads are properly terminated |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special handling during assembly; reduces risk of field-induced failure |
| RoHS-compliant (e3 suffix option) | Meets global environmental compliance requirements without performance trade-offs |
Applications
| DC Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage in unregulated linear power supplies feeding analog instrumentation circuits. IC Role / Device Role / Timing Role: Zener diode providing fixed 11 V reference for op-amp biasing and ADC reference buffers. Use Value: Maintains ±0.25 V regulation (ΔVZ) across load current variations, ensuring consistent analog signal scaling. | Use Scenario: Protecting input stages of microcontroller-based sensor interfaces from transient voltage spikes on 12 V rail. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 12.1 V maximum during ESD or load-dump events. Use Value: Withstands 8.0 A surge current (8.3 ms half-sine), absorbing >30 J transient energy without degradation. |
| Programmable Voltage Reference | Current Source Bias Network |
Use Scenario: Generating precise bias voltages for programmable gain amplifiers in industrial process controllers. IC Role / Device Role / Timing Role: Stable 11 V node enabling accurate resistor-ratio setting of amplifier gain. Use Value: Low 2.5 Ω dynamic impedance minimizes gain drift caused by supply current fluctuations. | Use Scenario: Establishing constant current for LED driver biasing in automotive interior lighting modules. IC Role / Device Role / Timing Role: Zener-regulated voltage source feeding base-emitter junction of current-setting transistor. Use Value: Operates reliably from –65 °C to +150 °C, supporting under-hood thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5348B/TR12 | ±5% tolerance (vs. ±10% for 1N5348A/TR12); otherwise identical electrical specs and package | Higher voltage accuracy required in precision reference designs; tighter regulation needed for feedback loops | Select 1N5348B/TR12 when ΔVZ stability and reduced VZ spread across production lots are critical |
| MMBZ5242B-TP | Surface-mount SOD-123 package; 10 V nominal; ±5%; 0.5 W rating; 17 Ω ZZ; 100 mA IZT | Space-constrained PCB layouts where axial leads are impractical; lower power dissipation acceptable | Choose MMBZ5242B-TP only for low-power, high-density designs where 5 W capability is unnecessary |
Compared with 1N5348B/TR12, the 1N5348A/TR12 trades voltage accuracy for cost and availability in legacy through-hole systems; versus MMBZ5242B-TP, it provides 10× higher power handling and superior thermal robustness but requires axial mounting space.
Availability
1N5348A/TR12 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection clamping, and programmable voltage reference applications requiring stable component supply and long-term obsolescence management.
Supply support for 1N5348A/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 1N53xxA/B series belongs to Microsemi's legacy silicon Zener diode product line, engineered for ruggedized voltage regulation in harsh-environment power systems where thermal stability and surge resilience are essential.
FAQ
What is the Zener voltage tolerance for 1N5348A/TR12?
The "A" suffix in 1N5348A/TR12 indicates a ±10% Zener voltage tolerance. At nominal 11 V, this corresponds to a guaranteed regulation range of 9.9 V to 12.1 V when measured at 125 mA test current and 25 °C lead temperature. This tolerance is confirmed in Microsemi's official 1N5333B–1N5388B datasheet revision D (2008), Table "ELECTRICAL CHARACTERISTICS." The 1N5348A/TR12 is not rated for tighter tolerances unless re-screened or replaced with a "B" (±5%) or "C" (±2%) variant.
Does 1N5348A/TR12 support RoHS compliance?
Yes, 1N5348A/TR12 can be supplied with RoHS-compliant matte-tin plating when ordered with the "e3" suffix (e.g., 1N5348Ae3/TR12). Per Microsemi documentation, the e3 designation confirms compliance with EU RoHS Directive 2011/65/EU and related amendments. Standard versions use tin-lead plating; the e3 variant replaces lead with pure tin while maintaining solderability per MIL-STD-750 Method 2026. Always verify suffix configuration on the orderable part number before procurement.
What is the maximum steady-state power dissipation for 1N5348A/TR12?
The 1N5348A/TR12 has a maximum steady-state power dissipation of 5.0 W when lead temperature (TL) is maintained below 25 °C, measured at 3/8″ (10 mm) from the body. When mounted on an FR4 PCB 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). This limitation is documented in the "MAXIMUM RATINGS" section of the Microsemi datasheet and must be accounted for in thermal design.
How is polarity marked on 1N5348A/TR12?
The cathode of 1N5348A/TR12 is marked by a visible color band on the plastic T-18 body. During operation, the banded end must be held at a more positive potential than the anode to achieve Zener breakdown and voltage regulation. Reversing polarity subjects the device to forward conduction (VF ≤ 1.2 V @ 1.0 A), which does not provide regulation. Polarity marking and functional direction are explicitly stated in the "MECHANICAL AND PACKAGING" section of the Microsemi datasheet.
What surge current rating does 1N5348A/TR12 support?
The 1N5348A/TR12 supports a maximum non-recurrent surge current (IZSM) of 8.0 A, defined as the peak amplitude of an 8.3 ms half-sine waveform. This rating is validated per JEDEC test methods and reflects the device's ability to absorb transient energy without parametric shift or catastrophic failure. It is distinct from continuous Zener current (IZM = 430 mA) and applies only to short-duration events such as load dump or ESD coupling. The 1N5348A/TR12 datasheet specifies this value in the "ELECTRICAL CHARACTERISTICS" table.
1N5348A/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:
- ±10%
- 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
1N5348A/TR12 FAQ
1.How can I place an order for 1N5348A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5348A/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 1N5348A/TR12 reliable?
The price and inventory of 1N5348A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5348A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348A/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5348A/TR12?
1N5348A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5348A/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 1N5348A/TR12?
For technical support, including 1N5348A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348A/TR12 requirements.
6.How does Aetrix verify that 1N5348A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5348A/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 1N5348A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5348A/TR12?
All 1N5348A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348A/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 1N5348A/TR12 part is unused and in its original packaging.
Return procedure for 1N5348A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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