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Microchip Technology 1N5351B/TR12
- Part No.:
- 1N5351B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5351B/TR12.pdf
- Description:
- DIODE ZENER 14V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,007
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Product details
Overview
1N5351B/TR12 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 regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N5351B/TR12 datasheet, 1N5351B/TR12 pinout, 1N5351B/TR12 application, or 1N5351B/TR12 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 reference with specified regulation over 10–50% of IZM (100 mA to 500 mA). Its low dynamic impedance (2.5 Ω) ensures stable output under varying load currents, and its 25 °C/W thermal resistance enables reliable 5 W dissipation at lead temperature ≤25 °C with 10 mm lead length.
Voltage regulation (ΔVZ = 0.25 V) is measured between 10% and 50% of IZM, confirming tight tracking across operating current. The cathode band polarity marking and 1.0 V maximum forward voltage at 1.0 A support unambiguous PCB layout and forward-conduction verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14 V nominal, ±5% tolerance - defines precise regulation point for feedback loops and clamping thresholds |
| Test Current (IZT) | 100 mA - standard bias point for measuring VZ and ZZ, used in reference design validation |
| Dynamic Impedance (ZZ) | 2.5 Ω max at 100 mA - ensures minimal output voltage shift under load transients |
| Max Zener Current (IZM) | 6.7 A - maximum steady-state reverse current achievable with adequate heat sinking at TL ≤25 °C |
| Power Dissipation | 5.0 W at 25 °C lead temperature - sets thermal design baseline for heatsink sizing and board copper area |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables direct calculation of junction temperature rise under operating conditions |
| Reverse Leakage (IR) | 1.0 μA max at 10.1 V - guarantees low standby power loss in high-impedance bias networks |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case (Void-free transfer molded thermosetting epoxy, UL94V-0 rated); cathode indicated by colored band; leads plated with RoHS-compliant annealed matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in reverse-bias configuration | Connected to system ground or lower-potential rail; forms return path for Zener current |
| Cathode | Regulated output node in reverse-bias configuration | Banded end; connected to voltage node requiring stabilization; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Guarantees standardized electrical behavior and mechanical interchangeability per industry specification |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints during SMT assembly prep |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected workstations |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU without exemption use; compatible with lead-free reflow profiles |
| High surge current rating (6.7 A) | Withstands 8.3 ms half-sine transients per JEDEC JESD22-A112, enabling robust overvoltage clamping |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing reference voltage for optocoupler-based feedback in isolated DC-DC converters. IC Role / Device Role / Timing Role: Zener reference element providing precise 14 V threshold to error amplifier input. Use Value: Maintains ±1% output regulation across line/load variations due to low ΔVZ (0.25 V) and stable ZZ. | Use Scenario: Clamping analog sensor output to protect ADC input from overvoltage events. IC Role / Device Role / Timing Role: Reverse-biased voltage limiter shunting transient energy above 14 V. Use Value: Absorbs 6.7 A surge without failure, preventing damage to downstream signal chain components. |
| Programmable Logic Controller I/O Protection | Automotive Body Control Module Reference |
Use Scenario: Protecting digital input pins against induced surges on 24 V field wiring. IC Role / Device Role / Timing Role: Standby shunt regulator clamping voltage spikes before they reach microcontroller GPIO. Use Value: Low leakage (1.0 μA @ 10.1 V) avoids false triggering while maintaining fast response to >14 V transients. | Use Scenario: Providing stable 14 V reference for voltage monitoring circuitry in 12 V battery systems. IC Role / Device Role / Timing Role: Precision voltage reference for comparator-based battery state-of-charge detection. Use Value: ±5% tolerance and minimal VZ drift over –65 °C to +150 °C ensure consistent trip points across vehicle operating conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5351BRLG | Same electrical specs; surface-mount SMB package instead of axial T-18; 1.5 W power rating | Requires PCB redesign for SMT placement; unsuitable for through-hole prototyping or high-power derated operation | Select when space-constrained layouts or automated assembly demand SMT form factor |
| MMBZ5242B | Same 14 V, ±5% rating but 0.35 W power; 30 Ω ZZ; SOT-23 package; 100 mA IZM | Limited to low-current biasing and signal-level clamping; cannot replace 1N5351B/TR12 in 5 W power regulation roles | Select only for low-power voltage references where thermal mass and surge immunity are not required |
Compared with 1N5351BRLG and MMBZ5242B, the 1N5351B/TR12 delivers full 5 W dissipation capability, axial-leaded mechanical robustness, and superior surge handling-making it the sole choice for industrial-grade power regulation where thermal margin and transient resilience are critical.
Availability
1N5351B/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and automotive body control modules requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for 1N5351B/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 ICs, discrete devices, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal stability, surge resilience, and JEDEC-standardized interchangeability across military and commercial applications.
FAQ
What is the Zener voltage tolerance of the 1N5351B/TR12?
The 1N5351B/TR12 has a nominal Zener voltage of 14 V with a ±5% tolerance, as indicated by the "B" suffix per Microsemi's documentation. This means the actual regulation voltage falls between 13.3 V and 14.7 V at 100 mA test current and 25 °C lead temperature. The 1N5351B/TR12 meets JEDEC registration requirements for this tolerance band and is validated for use in precision reference circuits where this accuracy level is sufficient.
Can the 1N5351B/TR12 be used in surface-mount designs?
No-the 1N5351B/TR12 is an axial-leaded T-18 package device intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5351B (SMB package, 5 W) and SMBG5351B (SMBG package, 5 W), both sharing identical electrical specifications. The 1N5351B/TR12 itself requires lead-forming and wave soldering or hand-soldering; attempting SMT placement would violate its mechanical and thermal design intent.
What is the maximum surge current rating for the 1N5351B/TR12?
The 1N5351B/TR12 has a maximum non-recurrent surge current (IZSM) of 6.7 A, defined as the peak value of an 8.3 ms half-sine waveform per JEDEC JESD22-A112. This rating applies under specified test conditions and confirms the 1N5351B/TR12's suitability for transient voltage suppression in industrial power rails. Derating is required for repeated surges or elevated ambient temperatures.
Does the 1N5351B/TR12 require dry packing before use?
No-the 1N5351B/TR12 has a moisture sensitivity level (MSL) of 1 per IPC/JEDEC J-STD-020B, meaning it is exempt from dry pack requirements and has unlimited floor life under standard storage conditions. This eliminates baking steps prior to soldering and simplifies handling for the 1N5351B/TR12 in both prototype and production environments.
How does thermal resistance affect the 1N5351B/TR12's power dissipation capability?
The 1N5351B/TR12 has a junction-to-lead thermal resistance of 25 °C/W at 3/8″ (10 mm) lead length. This means each watt dissipated raises the junction temperature 25 °C above lead temperature. At 25 °C lead temperature, full 5 W operation is allowed; above that, linear derating applies. Proper heatsinking of the leads is essential to maintain reliability-without it, the 1N5351B/TR12 cannot sustain rated power.
1N5351B/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):
- 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/TR12 FAQ
1.How can I place an order for 1N5351B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5351B/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 1N5351B/TR12 reliable?
The price and inventory of 1N5351B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5351B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5351B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5351B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5351B/TR12?
1N5351B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5351B/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 1N5351B/TR12?
For technical support, including 1N5351B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5351B/TR12 requirements.
6.How does Aetrix verify that 1N5351B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5351B/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 1N5351B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5351B/TR12?
All 1N5351B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5351B/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 1N5351B/TR12 part is unused and in its original packaging.
Return procedure for 1N5351B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5351B/TR12 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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