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Microchip Technology 1N5351A/TR8
- Part No.:
- 1N5351A/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5351A/TR8.pdf
- Description:
- DIODE ZENER 14V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,567
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Product details
Overview
1N5351A/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 14 V, ±10% tolerance (A suffix), 2.5 Ω maximum dynamic impedance at 100 mA test current, and 340 mA maximum Zener current (IZM) when adequately heat-sunk. It operates across –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in DC power supplies.
For engineers reviewing the 1N5351A/TR8 datasheet, 1N5351A/TR8 pinout, 1N5351A/TR8 application, or 1N5351A/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (6.7 A), reverse leakage performance at 10.1 V, and RoHS-compliant matte-tin lead plating.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across wide operating current (100 mA IZT to 340 mA IZM) and temperature ranges. Its low dynamic impedance (2.5 Ω) and tight voltage regulation (ΔVZ = 0.25 V between 10% and 50% IZM) support stable reference generation under varying load conditions.
The 1N5351A/TR8 uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 260 °C soldering (10 s), and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required. Its 25 °C/W junction-to-lead thermal resistance enables high-power operation with minimal heatsinking when leads are trimmed to 10 mm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14 V ±10% - defines nominal regulation point; actual range 12.6–15.4 V at 100 mA |
| Test Current (IZT) | 100 mA - standardized bias point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 2.5 Ω max - ensures minimal voltage shift under load transients up to 10% IZT ac modulation |
| Max Zener Current (IZM) | 340 mA - maximum continuous dc current at TL = 25 °C with 10 mm lead length |
| Reverse Leakage (IR) | 1.0 μA max at VR = 10.1 V - guarantees low standby power loss in high-impedance bias networks |
| Voltage Regulation (ΔVZ) | 0.25 V - difference between VZ measured at 34 mA and 170 mA, indicating regulation linearity |
| Surge Current (IZSM) | 6.7 A - peak non-repetitive half-sine (8.3 ms) capability for transient suppression |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-41 variant; void-free UL94V-0 epoxy body; cathode indicated by single black band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower potential; forward voltage ≤1.2 V at 1.0 A |
| Cathode | Zener regulation terminal / high-side reference node | Banded end; operated positive relative to anode; carries full Zener current and dissipation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Guarantees mechanical and electrical interchangeability across 1N53xx series per industry standard |
| ±10% voltage tolerance (A suffix) | Enables cost-optimized regulation where tighter tolerances are unnecessary |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to assembly |
| 260 °C solder tolerance | Compatible with standard lead-free reflow and hand-soldering processes |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-safe packaging during assembly |
Applications
| DC Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing unregulated 18 V rail to supply analog sensor circuitry requiring clean 14 V reference. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fixed voltage reference independent of load current variation. Use Value: Maintains output within ±0.25 V across 34–170 mA load range, minimizing sensor offset drift. |
Use Scenario: Clamping transient spikes on 12 V automotive control bus during load dump events. IC Role / Device Role / Timing Role: Fast-acting voltage clamp diverting surge energy to ground before downstream IC damage. Use Value: Withstands 6.7 A non-repetitive surge (8.3 ms) while limiting clamped voltage to ≤15.4 V. |
| Programmable Reference Source | Current Source Bias Network |
Use Scenario: Setting threshold voltage for comparator-based battery charge termination at 14 V. IC Role / Device Role / Timing Role: Precision voltage reference defining trip point for analog decision circuitry. Use Value: Low ΔVZ (0.25 V) ensures consistent trigger point across temperature and aging. |
Use Scenario: Establishing stable bias current for high-gain transistor amplifier stage. IC Role / Device Role / Timing Role: Constant-voltage node enabling predictable emitter degeneration resistor current. Use Value: 2.5 Ω ZZ minimizes current variation (<2.5%) under 10% signal-induced impedance modulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5351B/TR8 | ±5% tolerance (13.3–14.7 V), same VZ nominal, 2.5 Ω ZZ, 340 mA IZM | Higher precision needed for reference circuits where 1 V tolerance margin is insufficient | Select when tighter regulation stability justifies higher unit cost and tighter inventory control |
| MMBZ5242BS-7-F | Surface-mount SOD-123 package, 14 V ±5%, 100 mW Pd, 20 Ω ZZ, 100 mA IZM | Space-constrained PCBs requiring automated placement; unsuitable for >100 mW continuous dissipation | Choose only for low-power biasing where thermal mass and surge immunity are secondary |
Compared with 1N5351A/TR8, the 1N5351B/TR8 offers improved voltage accuracy but identical thermal and surge performance, while MMBZ5242BS-7-F trades power handling and ruggedness for miniaturization-neither is pin-compatible due to axial vs. surface-mount form factor.
Availability
1N5351A/TR8 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection clamping, and programmable reference source applications requiring stable component supply, long-lifecycle availability, and traceable sourcing for industrial and automotive electronics.
Supply support for 1N5351A/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 1N53xx series was designed as a JEDEC-standardized, high-power Zener platform delivering robust voltage regulation across 3.3–200 V with military-grade screening options and broad thermal performance.
FAQ
What is the Zener voltage tolerance for 1N5351A/TR8?
The "A" suffix in 1N5351A/TR8 specifies a ±10% Zener voltage tolerance, meaning its regulated voltage falls between 12.6 V and 15.4 V at 100 mA test current and 25 °C lead temperature. This tolerance is confirmed in the manufacturer's datasheet revision D, footnote 1, and applies across the full operating temperature range of –65 °C to +150 °C. The 1N5351A/TR8 is not rated for tighter tolerance grades like B (±5%) or C (±2%).
Does 1N5351A/TR8 require dry packing before PCB assembly?
No, the 1N5351A/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, which means it is exempt from dry pack requirements and can be stored and assembled without baking or humidity-controlled handling. This is explicitly stated in the "Features" section of the Microsemi datasheet and verified via its T-18 epoxy package construction meeting UL94V-0 flammability rating.
What is the maximum surge current rating for 1N5351A/TR8?
The 1N5351A/TR8 is rated for a non-repetitive peak surge current (IZSM) of 6.7 A, defined as the maximum amplitude of an 8.3 ms half-sine waveform. This value is derived from the device's 5 W power rating and 14 V Zener voltage, and is validated in the "Electrical Characteristics" table on page 1 of the official datasheet. It supports transient suppression in automotive and industrial power rails.
Can 1N5351A/TR8 be used in surface-mount designs?
No, the 1N5351A/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5351A series in DO-214AA (SMB) package, which shares the same 14 V ±10% regulation and 5 W rating but requires different footprint and reflow profile. Substitution requires PCB redesign and validation of thermal derating.
What is the thermal resistance of 1N5351A/TR8 and how does it affect power handling?
The 1N5351A/TR8 has a junction-to-lead thermal resistance of 25 °C/W when leads are trimmed to 3/8 inch (10 mm) from the body. At ambient temperature (TA), its steady-state power drops to 1.47 W on FR4 with 4 mm² copper pads-this derating must be applied in enclosed or high-TA environments. Full 5 W operation requires controlled lead temperature (TL < 25 °C), typically achieved with chassis mounting or extended leads.
1N5351A/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):
- 14 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 10.1 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
1N5351A/TR8 FAQ
1.How can I place an order for 1N5351A/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5351A/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 1N5351A/TR8 reliable?
The price and inventory of 1N5351A/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5351A/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5351A/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5351A/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5351A/TR8?
1N5351A/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5351A/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 1N5351A/TR8?
For technical support, including 1N5351A/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5351A/TR8 requirements.
6.How does Aetrix verify that 1N5351A/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5351A/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 1N5351A/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5351A/TR8?
All 1N5351A/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5351A/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 1N5351A/TR8 part is unused and in its original packaging.
Return procedure for 1N5351A/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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