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onsemi 1N5343B
- Part No.:
- 1N5343B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343B.pdf
- Description:
- DIODE ZENER 7.5V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,165
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Product details
Overview
1N5343B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 7.5 V, ±5% tolerance, maximum zener impedance of 175 Ω at 1.5 mA test current, and surge rating of 630 A at 8.3 ms. It operates as a precision voltage reference or shunt regulator in DC power supply feedback loops, overvoltage protection circuits, and voltage-clamping applications.
For engineers reviewing the 1N5343B datasheet, pinout, applications, or equivalent options, key selection criteria include its 7.5 V nominal regulation, 175 Ω dynamic impedance at IZT = 1.5 mA, 10.7 V maximum leakage voltage (VR), 0.15 mA reverse leakage at VR, and thermal resistance of 25 °C/W junction-to-lead.
Technical Context
The 1N5343B employs a silicon-oxide passivated junction for stable breakdown characteristics and low leakage. Its zener voltage is specified at two test currents-IZT = 1.5 mA (for regulation) and IZK = 1 mA (for knee region)-with corresponding impedances of 175 Ω and 200 Ω respectively.
It features Class 3 ESD immunity (>16 kV HBM), 180 W non-repetitive surge capability at 8.3 ms, and operates across −65 °C to +200 °C, with DC max junction temperature limited to 150 °C. Thermal performance is defined by θJL = 25 °C/W at TL = 25 °C with 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.13–7.88 V (±5% tolerance at IZT = 1.5 mA; enables precise 7.5 V reference in regulated supplies) |
| Zener Impedance (ZZT) | 175 Ω max at IZT = 1.5 mA (low dynamic resistance ensures stable regulation under load variation) |
| Max Power Dissipation | 5 W at TL = 25 °C (supports robust shunt regulation without external heatsinking for moderate loads) |
| Reverse Leakage (IR) | 0.15 mA max at VR = 5.7 V (low leakage preserves efficiency in high-impedance bias networks) |
| Surge Current (IR) | 630 A peak at 8.3 ms (withstands transient overvoltage events per IEC 61000-4-5 Level 3) |
| Junction-to-Lead θ | 25 °C/W (enables thermal design using lead conduction; derates 40 mW/°C above 25 °C) |
| ESD Rating | Class 3 (>16 kV HBM) (survives handling and board-level ESD without parameter shift) |
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 / Zener cathode reference node | Connected to circuit ground or lower-potential rail; defines reference point for clamping/regulation |
| Cathode | Zener breakdown terminal / Regulation output node | Connected to input voltage source; maintains 7.5 V relative to anode during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| Silicon-oxide passivated junction | Enables tight ±5% VZ tolerance and low long-term drift (<0.1%/1000 h typical) |
| 180 W surge rating at 8.3 ms | Protects downstream circuitry against lightning-induced transients and inductive kickback |
| Class 3 ESD immunity (>16 kV HBM) | Eliminates need for external ESD protection in handheld and industrial control interfaces |
| Pb-free compliant (G suffix) | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 moisture sensitivity |
| Void-free thermosetting plastic case | Provides hermetic-grade environmental protection in humid, dusty, or chemically aggressive enclosures |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Stabilizing output voltage in linear regulators or switching converter feedback paths where space and cost preclude active references. IC Role / Device Role / Timing Role: Shunt voltage reference providing 7.5 V setpoint to error amplifier inputs. Use Value: Delivers ±5% regulation accuracy with 175 Ω dynamic impedance, minimizing output ripple under line/load transients. | Use Scenario: Protecting 5 V or 3.3 V GPIO pins from accidental 12 V miswiring or ESD events in industrial HMIs. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor clamping excess voltage to safe levels. Use Value: Activates at 7.5 V (below 12 V fault level), limiting pin voltage to ≤10.7 V while absorbing 630 A surges. |
| DC Rail Voltage Monitor | Temperature-Stable Bias Network |
Use Scenario: Detecting undervoltage or overvoltage conditions on 5 V or 12 V system rails using comparator inputs. IC Role / Device Role / Timing Role: Precision voltage threshold element defining trip points for supervisory ICs or discrete comparators. Use Value: Maintains stable 7.5 V reference across −65 °C to +150 °C, enabling reliable monitoring in automotive engine bays. | Use Scenario: Generating stable bias currents for op-amp input stages or transistor amplifiers in analog signal chains. IC Role / Device Role / Timing Role: Low-drift voltage source establishing fixed base-emitter or gate-source potentials. Use Value: Achieves <±0.01%/°C tempco below 10 V range, reducing gain drift in instrumentation amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | Same 6.2 V nominal VZ but ±5% tolerance, 10 W rating, higher ZZT (10 Ω), TO-204AA metal can package | Higher power dissipation and better thermal stability; requires mounting hardware | Select when >5 W continuous dissipation or superior thermal cycling reliability is required |
| BZX85C7V5 | 7.5 V nominal VZ, ±5%, 1.3 W rating, 100 Ω ZZT, DO-41 package, lower surge rating (100 A) | Lower cost and smaller footprint; insufficient for 630 A surge or 5 W DC operation | Select for space-constrained consumer electronics where full 5 W capability is unnecessary |
Compared with 1N5343B, the 1N4734A offers higher power and thermal robustness but larger size and cost, while the BZX85C7V5 provides compactness and lower price at the expense of surge resilience and power handling-making 1N5343B optimal for industrial 5 W shunt regulation where axial-lead reliability and 630 A surge margin are critical.
Availability
1N5343B is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom infrastructure equipment requiring stable component supply and long-term obsolescence management.
Supply support for 1N5343B 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The 1N53 Series is part of onsemi's legacy Surmetic™ Zener portfolio, designed specifically for high-reliability DC voltage regulation, transient suppression, and precision reference applications in harsh environments.
FAQ
What is the nominal zener voltage and tolerance of the 1N5343B?
The 1N5343B has a nominal zener voltage of 7.5 V with a guaranteed tolerance of ±5%, meaning its actual VZ falls between 7.13 V and 7.88 V when tested at IZT = 1.5 mA and TA = 25 °C. This tight tolerance supports accurate voltage setting in feedback networks and reference circuits without trimming.
Can the 1N5343B be used in surface-mount designs?
No, the 1N5343B is exclusively an axial-lead device in Case 017AA plastic package and is not compatible with SMT assembly. It requires through-hole mounting with 3/8″ lead length for thermal compliance. For SMT alternatives, consider the SMAZ7.5 or BZT52-B7V5 series, which differ in power rating, impedance, and surge capability.
What is the maximum steady-state power dissipation for the 1N5343B?
The 1N5343B is rated for 5 W maximum steady-state power dissipation at TL = 25 °C with 3/8″ lead length. Power must be derated by 40 mW/°C above 25 °C ambient, reaching zero dissipation at TL = 150 °C. This rating assumes proper lead conduction to PCB copper or heatsink.
How does the 1N5343B perform under transient surge conditions?
The 1N5343B withstands up to 630 A peak non-repetitive surge current at 8.3 ms pulse width, corresponding to 180 W instantaneous power. This capability is validated per IEC 61000-4-5 surge immunity standards and enables use in unprotected AC/DC front-ends and motor drive snubbers without additional TVS devices.
Is the 1N5343B RoHS-compliant and lead-free?
Yes, the 1N5343B is offered in Pb-free packaging (indicated by the "G" suffix in ordering codes such as 1N5343BG). It complies with RoHS Directive 2011/65/EU and meets JEDEC J-STD-609A Class 3 moisture sensitivity requirements, supporting lead-free reflow and wave soldering processes.
1N5343B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5.7 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
1N5343B FAQ
1.How can I place an order for 1N5343B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343B 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 1N5343B reliable?
The price and inventory of 1N5343B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343B is usually 5 days.
3.What payment methods are accepted for 1N5343B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343B?
1N5343B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343B 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 1N5343B?
For technical support, including 1N5343B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343B requirements.
6.How does Aetrix verify that 1N5343B is sourced from the original manufacturer or authorized distributors?
All 1N5343B 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 1N5343B meets industry standards.
7.What is the process for return or replacement of 1N5343B?
All 1N5343B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343B, 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 1N5343B part is unused and in its original packaging.
Return procedure for 1N5343B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343B 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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