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Microchip Technology 1N5351B/TR8
- Part No.:
- 1N5351B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5351B/TR8.pdf
- Description:
- DIODE ZENER 14V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,972
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Product details
Overview
1N5351B/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 14 V, ±5% tolerance (B suffix), 2.5 Ω maximum dynamic impedance at 100 mA test current, and 6.7 A maximum Zener current when adequately heat-sunk. It provides stable voltage reference in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.
For engineers reviewing the 1N5351B/TR8 datasheet, 1N5351B/TR8 pinout, 1N5351B/TR8 application, or 1N5351B/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (6.7 A), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device operates as a reverse-biased voltage regulator with specified Zener voltage measured at 100 mA (IZT) and 25 °C lead temperature. Its low dynamic impedance (2.5 Ω) ensures minimal voltage variation across operating current changes, and its 25 °C/W thermal resistance enables high-power operation with simple lead-length heat sinking.
The 1N5351B/TR8 features a T-18 axial package with cathode band marking, moisture sensitivity level 1 (no dry pack required), and compliance with JEDEC registration standards. It withstands 8.3 ms half-sine surge currents up to 6.7 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) | 14 V ±5% - precise regulation point for 12–15 V system references |
| Test Current (IZT) | 100 mA - standardized bias point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 2.5 Ω max - low AC resistance ensures stable output under varying load conditions |
| Max Zener Current (IZM) | 6.7 A - peak DC current achievable with 3/8″ lead length heat sinking at 25 °C |
| Power Dissipation | 5.0 W at TL = 25 °C - rated steady-state power with proper thermal management |
| Thermal Resistance | 25 °C/W junction-to-lead - enables high-current operation using PCB copper or chassis conduction |
| Surge Current (IZSM) | 6.7 A (8.3 ms half-sine) - transient overvoltage clamping capability without failure |
| Voltage Regulation (ΔVZ) | 0.25 V max - difference between VZ at 10% and 50% of IZM, indicating tight regulation linearity |
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. Body meets UL94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit common or lower-potential node; reverse voltage applied across anode-to-cathode |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to regulated voltage rail; reverse-biased to maintain 14 V reference |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Ensures industry-standard electrical and mechanical compatibility across suppliers |
| ±5% voltage tolerance (B suffix) | Reduces calibration overhead in mid-precision reference and protection applications |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and baking prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special static control in standard manufacturing environments |
| RoHS-compliant option (e3 suffix) | Meets environmental compliance requirements without performance trade-offs |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback loop via optocoupler interface. IC Role / Device Role / Timing Role: Zener reference element providing stable 14 V threshold for TL431-like error amplifier bias or direct shunt regulation. Use Value: Maintains ±5% output regulation across line/load transients due to low ΔVZ (0.25 V) and 2.5 Ω ZZ. | Use Scenario: Clamps transient surges on 12 V automotive or industrial bus lines during load dump or inductive switching. IC Role / Device Role / Timing Role: Passive overvoltage protector absorbing 8.3 ms surges up to 6.7 A without degradation. Use Value: Prevents downstream IC damage by limiting bus voltage to ≤14.7 V (14 V + 5%) during fault events. |
| Precision Bias Network | Reference Voltage Generator |
Use Scenario: Sets gate drive threshold or op-amp input bias in analog sensor signal conditioning stages. IC Role / Device Role / Timing Role: Stable DC reference source for MOSFET gate biasing or comparator hysteresis setting. Use Value: Delivers 14 V reference with <0.25 V drift across 10–50% IZM range, minimizing offset error propagation. | Use Scenario: Generates fixed 14 V reference for ADC voltage scaling or microcontroller brown-out detection. IC Role / Device Role / Timing Role: Primary voltage reference element in low-cost, non-temperature-compensated systems. Use Value: Provides repeatable 14 V threshold with ±5% tolerance-sufficient for BOD trip points where absolute accuracy is secondary to consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5351B (bulk) | Identical electrical specs; differs only in packaging (bulk vs. tape-and-reel TR8) | No functional difference; TR8 enables automated pick-and-place; bulk suits manual prototyping | Select 1N5351B/TR8 for SMT production; choose bulk for bench validation or low-volume hand assembly |
| MMBZ5241B (SOT-23) | Same 14 V ±5%, but 0.5 W rating, 30 Ω ZZ, and surface-mount package | Not suitable for 5 W power dissipation; limited to low-current bias/reference roles | Use MMBZ5241B only in space-constrained, low-power designs where thermal mass is insufficient for axial devices |
Compared with 1N5351B/TR8, the bulk version offers identical regulation performance with manual handling flexibility, while MMBZ5241B trades power capability for miniaturization-making the 1N5351B/TR8 optimal for robust 5 W reference and clamp duties requiring axial thermal management.
Availability
1N5351B/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, precision bias networks, and reference voltage generators requiring stable component supply and JEDEC-standard Zener performance.
Supply support for 1N5351B/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 semiconductor company specializing in high-reliability analog, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and long-term stability under continuous DC stress.
FAQ
What is the Zener voltage tolerance of the 1N5351B/TR8?
The 1N5351B/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its nominal 14 V regulation point falls within 13.3 V to 14.7 V at 100 mA test current and 25 °C lead temperature. The tolerance is guaranteed per JEDEC registration and applies across the full operating temperature range of –65 °C to +150 °C.
What is the maximum continuous Zener current for the 1N5351B/TR8?
The 1N5351B/TR8 supports a maximum continuous Zener current (IZM) of 6.7 A when mounted with 3/8″ (10 mm) lead length from the body at 25 °C lead temperature. This corresponds to its 5.0 W power rating. Derating is required above 25 °C per the published power derating curve in the Microsemi datasheet.
Is the 1N5351B/TR8 RoHS compliant?
Yes-the 1N5351B/TR8 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation. Its leads feature annealed matte-tin plating that meets RoHS requirements and is solderable per MIL-STD-750 Method 2026, with no lead-free conversion compromises to electrical or thermal performance.
How is polarity marked on the 1N5351B/TR8?
The 1N5351B/TR8 uses a cathode band marking: the banded end is the cathode and must be held at a higher potential than the anode to operate in Zener breakdown mode. This polarity is critical-reverse connection results in forward conduction (~1.2 V drop) rather than regulation. The band aligns with JEDEC T-18 mechanical standards and is visible on the void-free epoxy body.
What is the thermal resistance specification for the 1N5351B/TR8?
The 1N5351B/TR8 has a junction-to-lead thermal resistance of 25 °C/W when measured at 3/8″ (10 mm) lead length from the body. When mounted on a standard FR4 PCB (1 oz Cu, 4 mm² pads, 1 mm track width × 25 mm length), its junction-to-ambient resistance rises to 85 °C/W-requiring careful layout or external heatsinking for sustained 5 W operation.
1N5351B/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:
- ±5%
- 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
1N5351B/TR8 FAQ
1.How can I place an order for 1N5351B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5351B/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 1N5351B/TR8 reliable?
The price and inventory of 1N5351B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5351B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5351B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5351B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5351B/TR8?
1N5351B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5351B/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 1N5351B/TR8?
For technical support, including 1N5351B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5351B/TR8 requirements.
6.How does Aetrix verify that 1N5351B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5351B/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 1N5351B/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5351B/TR8?
All 1N5351B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5351B/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 1N5351B/TR8 part is unused and in its original packaging.
Return procedure for 1N5351B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5351B/TR8 Tags
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