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onsemi 1N5351B
- Part No.:
- 1N5351B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5351B.pdf
- Description:
- DIODE ZENER 14V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,020
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Product details
Overview
1N5351B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 14 V (±5%), maximum zener impedance of 100 Ω at 2.5 mA test current, and surge rating of 340 A at 8.3 ms. It operates across −65 °C to +200 °C and delivers stable voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N5351B datasheet, pinout, applications, or equivalent options, this device serves as a high-reliability, Pb-free discrete voltage reference with ESD immunity >16 kV (HBM), tight ±5% tolerance, and validated thermal performance in axial plastic packages.
Technical Context
The 1N5351B employs a silicon-oxide passivated junction for enhanced stability and low leakage. Its zener voltage is specified at IZT = 2.5 mA with guaranteed min/typ/max values of 13.3 V / 14 V / 14.7 V and temperature coefficient of +6.7 mV/°C.
It supports DC regulation up to 75 mA maximum zener current (IZM), limited by its 5 W power rating and 14 V nominal VZ. The device exhibits 100 Ω dynamic impedance at IZT and <1 μA reverse leakage at VR = 10.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14 V nominal (13.3–14.7 V range); enables precise 14 V rail clamping or reference generation |
| Power Rating | 5 W at TL = 25°C; derates linearly above 25°C (40 mW/°C), supporting sustained regulation under load |
| Zener Impedance (ZZT) | 100 Ω max @ IZT = 2.5 mA; ensures low output impedance for stable regulation under varying current |
| Max Zener Current (IZM) | 75 mA; derived from 5 W / 14 V, defining safe continuous operating limit |
| Surge Current (IR) | 340 A peak @ 8.3 ms; withstands transient overloads without degradation |
| ESD Rating | Class 3 (>16 kV HBM); provides robust handling in automated assembly and field environments |
| Operating Temp | −65 °C to +200 °C; suitable for under-hood automotive, industrial controls, and high-temp PCB layouts |
Pinout & Package
Package: Axial lead, transfer-molded plastic (Case 017AA), cathode indicated by band. Dimensions: 8.38–8.89 mm length × 3.30–3.68 mm diameter; leads 25.4–31.75 mm long.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node; carries forward current up to 1.0 A (VF ≤ 1.2 V) |
| Cathode | Zener breakdown terminal | Connected to higher-potential node; regulates voltage when reverse-biased above 14 V |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener tolerance | Guaranteed 13.3–14.7 V range eliminates need for post-production trimming in 14 V reference designs |
| Silicon-oxide passivation | Reduces surface leakage and improves long-term parameter stability vs. non-passivated Zeners |
| 180 W surge capability | Supports transient suppression in 12 V automotive systems without external TVS stacking |
| Pb-free construction | Complies with RoHS and JEDEC J-STD-020 reflow profiles without lead contamination risk |
| Void-free plastic case | Prevents moisture ingress and delamination during thermal cycling or humidity exposure |
Applications
| Automotive Power Rail Protection | Industrial Sensor Reference Supply |
|---|---|
Use Scenario: Clamping 12 V battery line against load-dump transients in engine control units. IC Role / Device Role / Timing Role: Discrete voltage clamp protecting downstream LDOs and microcontrollers. Use Value: Withstands 340 A surges at 8.3 ms and maintains regulation within ±5% across −40 °C to +125 °C ambient. | Use Scenario: Providing stable 14 V bias to precision analog front-ends in factory automation sensors. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference buffers and op-amp bias networks. Use Value: 100 Ω zener impedance ensures <10 mV output variation under 1–5 mA load shifts, critical for 12-bit+ measurement accuracy. |
| DC-DC Converter Feedback Divider | Overvoltage Lockout Circuit |
Use Scenario: Setting regulated output voltage in isolated flyback converters via optocoupler feedback path. IC Role / Device Role / Timing Role: Precision shunt reference replacing TL431 where higher power dissipation is required. Use Value: 5 W rating allows direct use without series resistor, simplifying layout and improving thermal margin over 1 W Zeners. | Use Scenario: Triggering shutdown when input voltage exceeds 14.7 V in telecom power modules. IC Role / Device Role / Timing Role: Threshold detector enabling fast response (<100 ns) to overvoltage events. Use Value: Sharp knee at 14 V with <1 μA leakage below 10.6 V ensures minimal false triggering and low standby current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5351 | Same electrical specs but ±10% tolerance (vs. ±5% for 1N5351B); no "B" suffix indicates looser grading | Acceptable where cost sensitivity outweighs precision; not suitable for 14 V reference requiring tight regulation | Select 1N5351B when ±5% VZ stability is mandatory; choose 1N5351 only for non-critical clamping |
| MMSZ5241B | Surface-mount SOD-123 package; 14 V nominal but 500 mW rating (vs. 5 W); 20 Ω ZZT @ 5 mA | Used in space-constrained PCBs; unsuitable for >100 mA surge or >0.5 W continuous dissipation | Choose MMSZ5241B for compact consumer electronics; retain 1N5351B for high-power industrial or automotive roles |
Compared with 1N5351 and MMSZ5241B, the 1N5351B uniquely combines 5 W power handling, ±5% tolerance, and axial-leaded ruggedness-making it irreplaceable in high-surge, high-temperature, or high-reliability 14 V regulation tasks where SMT alternatives lack thermal mass or through-hole variants lack precision.
Availability
1N5351B is available at Aetrix Electronics and suitable for automotive power management, industrial sensor conditioning, and telecom overvoltage protection requiring stable component supply and long-lifecycle support.
Supply support for 1N5351B 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
onsemi (Semiconductor Components Industries, LLC) is a global supplier of energy-efficient semiconductor solutions, specializing in automotive, industrial, cloud, and IoT applications.
The 1N53 Series belongs to onsemi's Surmetic™ 40 Zener regulator family, engineered for high-reliability voltage reference and transient suppression in harsh-environment electronics where thermal stability and surge resilience are critical.
FAQ
What is the zener voltage tolerance of the 1N5351B?
The 1N5351B has a guaranteed ±5% zener voltage tolerance, meaning its reverse breakdown voltage falls between 13.3 V and 14.7 V at IZT = 2.5 mA and TA = 25°C. This tighter tolerance than standard 1N5351 (±10%) makes the 1N5351B suitable for precision reference applications where regulation accuracy is critical. The "B" suffix explicitly denotes this graded tolerance per JEDEC standards.
Can the 1N5351B be used in surface-mount designs?
No, the 1N5351B is an axial-lead through-hole device in Case 017AA plastic package and is not compatible with surface-mount assembly processes. For SMT equivalents, consider the MMSZ5241B (SOD-123, 14 V, 500 mW) or BZX84-C15 (SOT-23, 15 V, 300 mW), though neither matches the 1N5351B's 5 W power rating or surge capability. The 1N5351B requires wave or hand soldering with lead temperature limited to 260°C for 10 seconds.
What is the maximum continuous zener current for the 1N5351B?
The maximum DC zener current (IZM) for the 1N5351B is 75 mA, calculated from its 5 W power rating divided by the nominal 14 V zener voltage (5 W ÷ 14 V ≈ 0.357 A), then adjusted per datasheet Table 3 to reflect worst-case VZmax = 14.7 V (5 W ÷ 14.7 V ≈ 340 mA), but constrained by thermal limits to 75 mA at TL = 25°C. Exceeding this current risks thermal runaway or parametric shift.
Does the 1N5351B meet RoHS requirements?
Yes, the 1N5351B is offered in a Pb-free package (indicated by the "G" suffix in ordering codes like 1N5351BG), compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level (MSL) requirements. The device uses lead-free solderable terminations and void-free thermosetting plastic encapsulation, verified per onsemi's Pb-Free Packaging Specification.
How does the 1N5351B handle transient overvoltage events?
The 1N5351B sustains up to 340 A peak non-repetitive surge current at 8.3 ms pulse width, corresponding to 180 W instantaneous power. This capability is validated per Figure 5 in the datasheet and enables direct use in automotive load-dump protection without additional TVS devices. Its 200°C max storage temperature and silicon-oxide passivation ensure reliability under repeated transient stress.
1N5351B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- 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 @ 10.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N5351B FAQ
1.How can I place an order for 1N5351B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5351B 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 reliable?
The price and inventory of 1N5351B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5351B is usually 5 days.
3.What payment methods are accepted for 1N5351B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5351B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5351B?
1N5351B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5351B 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?
For technical support, including 1N5351B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5351B requirements.
6.How does Aetrix verify that 1N5351B is sourced from the original manufacturer or authorized distributors?
All 1N5351B 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 meets industry standards.
7.What is the process for return or replacement of 1N5351B?
All 1N5351B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5351B, 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 part is unused and in its original packaging.
Return procedure for 1N5351B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5351B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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