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Microchip Technology 1N5348A/TR8
- Part No.:
- 1N5348A/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5348A/TR8.pdf
- Description:
- DIODE ZENER 11V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,347
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Product details
Overview
1N5348A/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 11 V, ±10% tolerance (A suffix), 125 mA maximum Zener current (IZM), 2.5 Ω dynamic impedance (ZZ), and 0.25 V voltage regulation (ΔVZ). It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in DC power supplies.
For engineers reviewing the 1N5348A/TR8 datasheet, 1N5348A/TR8 pinout, 1N5348A/TR8 application, or 1N5348A/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (8.0 A), reverse leakage at VR = 8.0 V, and compatibility with tape-and-reel automated assembly (TR8 suffix).
Technical Context
This device functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across wide variations in input voltage and load current. Its low dynamic impedance (2.5 Ω) and tight voltage regulation (ΔVZ = 0.25 V) ensure minimal deviation between 10% and 50% of IZM.
The 1N5348A/TR8 uses a void-free thermosetting epoxy T-18 package with tin-lead or RoHS-compliant matte-tin plating, rated for 260 °C soldering (10 s), and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V ±10% - defines nominal regulation point under 125 mA test current |
| Power Dissipation | 5.0 W at TL = 25 °C (3/8″ lead length) - sets maximum steady-state thermal load |
| Zener Current (IZM) | 125 mA - maximum continuous reverse current before thermal runaway |
| Dynamic Impedance (ZZ) | 2.5 Ω - low AC impedance ensures stable regulation under varying load conditions |
| Voltage Regulation (ΔVZ) | 0.25 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Surge Current (IZSM) | 8.0 A (8.3 ms half-sine) - peak non-repetitive current handling for transient suppression |
| Thermal Resistance | 25 °C/W junction-to-lead - enables high-current operation with minimal heatsinking |
| Reverse Leakage (IR) | 5.0 μA at VR = 8.0 V - low off-state conduction preserves efficiency in standby |
Pinout & Package
T-18 axial-leaded plastic package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Polarity: banded end is cathode (must be positive relative to anode during regulation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail; carries full load current when regulating |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to unregulated input; establishes regulated 11 V at this node relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized electrical behavior and interchangeability across qualified suppliers |
| ±10% voltage tolerance (A suffix) | Cost-optimized regulation accuracy suitable for non-critical reference and clamp applications |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to SMT reflow or manual assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-safe workstations in production |
| Tape-and-reel packaging (TR8 suffix) | Enables direct use in automated pick-and-place equipment for high-volume PCB assembly |
Applications
| DC Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing +12 V rail in industrial control power modules where input varies ±15%. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fixed 11 V reference to error amplifier feedback network. Use Value: Maintains output within ±1.5% despite 200 mA load step changes due to 2.5 Ω ZZ and 0.25 V ΔVZ. | Use Scenario: Protecting microcontroller I/O pins against 24 V transients induced on sensor lines. IC Role / Device Role / Timing Role: Clamping element diverting surge energy above 11 V to ground before IC damage occurs. Use Value: Withstands 8.0 A (8.3 ms) surges without degradation, verified per JEDEC test conditions. |
| Reference Voltage Source | Temperature-Stable Bias Generator |
Use Scenario: Generating precise bias for op-amp comparators in battery management systems. IC Role / Device Role / Timing Role: Low-drift voltage reference feeding comparator hysteresis network. Use Value: Delivers stable 11 V across –40 °C to +85 °C ambient, supported by –65 °C to +150 °C operating range. | Use Scenario: Setting collector current in discrete transistor amplifiers requiring thermal compensation. IC Role / Device Role / Timing Role: Zener-based bias network compensating for VBE drift with temperature. Use Value: Achieves <±2% current variation over full temperature range due to low thermal resistance (25 °C/W). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5348B/TR8 | ±5% tolerance (B suffix) vs. ±10% (A suffix); identical VZ, IZM, ZZ, and package | Higher accuracy required for feedback loops where 0.5 V tolerance margin is insufficient | Select when tighter regulation stability justifies cost premium; same thermal and surge performance |
| MMBZ5241BS-7-F | Surface-mount SOD-123 package; 11 V ±5%, 225 mW rating; not drop-in compatible | Space-constrained PCBs where axial leads are impractical; unsuitable for >200 mA average loads | Choose only for low-power, high-density designs; requires layout change and derating for 5 W operation |
Compared with 1N5348B/TR8 and MMBZ5241BS-7-F, the 1N5348A/TR8 offers optimal balance of cost, 5 W power handling, and axial-leaded manufacturability-making it preferred for industrial power supplies and ruggedized clamping where ±10% tolerance is acceptable and board space permits leaded components.
Availability
1N5348A/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and analog reference design requiring stable component supply and long-term obsolescence support.
Supply support for 1N5348A/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxA/B series was designed for robust, high-power voltage regulation in harsh environments-emphasizing thermal resilience, surge immunity, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N5348A/TR8?
The 1N5348A/TR8 has a Zener voltage tolerance of ±10%, as indicated by the "A" suffix per Microsemi's documentation. This means its actual regulation voltage falls between 9.9 V and 12.1 V at 125 mA test current and 25 °C lead temperature. The tolerance is confirmed in the Electrical Characteristics table on page 1 of the official datasheet, where "A suffix designates ±10% tolerance." This tolerance level supports cost-sensitive applications where tight regulation is not critical.
Does the 1N5348A/TR8 require dry packing before PCB assembly?
No, the 1N5348A/TR8 does not require dry packing before PCB assembly. It is rated at IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1, meaning it can be stored indefinitely at ≤30 °C/85% RH without baking or dry pack. This is explicitly stated in the Features section and Maximum Ratings table of the Microsemi datasheet. The T-18 epoxy package's void-free construction contributes to this robust moisture resistance.
What is the maximum surge current rating for the 1N5348A/TR8?
The 1N5348A/TR8 has a maximum non-repetitive surge current (IZSM) rating of 8.0 A for an 8.3 ms half-sine waveform, as specified in the Electrical Characteristics table. This value is validated under JEDEC-standard test conditions and reflects the device's capability to absorb transient energy without failure. Surge capability is critical for overvoltage clamp applications where the 1N5348A/TR8 diverts short-duration spikes away from sensitive downstream circuitry.
Can the 1N5348A/TR8 be used in surface-mount designs?
No, the 1N5348A/TR8 is not suitable for surface-mount designs-it is an axial-leaded T-18 package intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5348B or SMBG5348B series, which share the same electrical specifications but use DO-214AA (SMB) or DO-214AB (SMBG) packages. Using the 1N5348A/TR8 in SMT processes would require mechanical adaptation and is not recommended due to lead geometry and thermal profile mismatch.
What is the forward voltage of the 1N5348A/TR8 at 1.0 A?
The forward voltage of the 1N5348A/TR8 is 1.2 V maximum at 1.0 A forward current, as specified in the Maximum Ratings table. This parameter applies when the device is operated in forward conduction mode (anode positive relative to cathode), such as in polarity protection or rectifier roles. While primarily used in reverse-biased Zener mode, this VF rating confirms low conduction loss if forward-biased operation is needed in hybrid circuit configurations.
1N5348A/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:
- ±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/TR8 FAQ
1.How can I place an order for 1N5348A/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5348A/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 1N5348A/TR8 reliable?
The price and inventory of 1N5348A/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348A/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5348A/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348A/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5348A/TR8?
1N5348A/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5348A/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 1N5348A/TR8?
For technical support, including 1N5348A/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348A/TR8 requirements.
6.How does Aetrix verify that 1N5348A/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5348A/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 1N5348A/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5348A/TR8?
All 1N5348A/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348A/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 1N5348A/TR8 part is unused and in its original packaging.
Return procedure for 1N5348A/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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