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Microchip Technology 1N5343BE3/TR12
- Part No.:
- 1N5343BE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343BE3/TR12.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,076
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Product details
Overview
1N5343BE3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 7.5 V ±5%, 175 mA test current, 1.5 Ω dynamic impedance at IZT, and maximum surge current of 20 A (8.3 ms half-sine). It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N5343BE3/TR12 datasheet, 1N5343BE3/TR12 pinout, 1N5343BE3/TR12 application, or 1N5343BE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power rating (5 W at TL < 25 °C), reverse leakage (<10 µA at 5.4 V), and RoHS-compliant matte-tin plating.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across variable load or line conditions. Its low dynamic impedance (1.5 Ω) ensures minimal voltage deviation under changing current, while its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with standard 3/8″ lead length heat sinking.
The device features cathode band polarity marking, UL94V-0 void-free epoxy encapsulation, and moisture sensitivity level 1 per J-STD-020B-eliminating dry pack requirements. It withstands ESD per MIL-STD-750 Method 1020 and surge stresses up to 20 A peak (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% at 175 mA - defines precise regulation point for feedback or clamping |
| Power Dissipation | 5.0 W at TL < 25 °C - supports high-current regulation with adequate lead heatsinking |
| Dynamic Impedance (ZZ) | 1.5 Ω at IZT = 175 mA - ensures tight voltage stability under load transients |
| Reverse Leakage (IR) | <10 µA at VR = 5.4 V - minimizes standby power loss in precision references |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables predictable thermal design without PCB copper pads |
| Surge Current | 20 A peak (8.3 ms half-sine) - sustains transient overvoltage events without failure |
| Operating Temperature | –65 °C to +150 °C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-204AL), void-free UL94V-0 epoxy body, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by colored band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during regulation |
| Cathode | Zener breakdown terminal / voltage regulation output | Banded end; connected to regulated rail or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Enables accurate voltage reference without post-calibration in mid-precision supplies |
| RoHS-compliant e3 suffix | Meets global environmental compliance without performance trade-offs |
| Moisture sensitivity Level 1 | Eliminates dry pack and bake requirements-reduces manufacturing overhead |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Supports handling in standard assembly lines without special ESD controls |
| High surge current rating (20 A) | Provides robust transient suppression in DC bus protection applications |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator or switching converter error amplifiers. IC Role / Device Role / Timing Role: Zener diode provides fixed reference voltage to comparator or op-amp input. Use Value: 7.5 V ±5% regulation with 1.5 Ω dynamic impedance ensures <±0.1 V deviation across 50–200 mA load current. | Use Scenario: Limiting transient voltage spikes on 5–12 V DC rails in motor drives or PLC I/O modules. IC Role / Device Role / Timing Role: Shunts excess energy to ground when rail exceeds 7.5 V threshold. Use Value: 20 A surge rating and 25 °C/W thermal resistance enable repeated 100 V/10 ms transients without degradation. |
| Industrial Sensor Excitation | Programmable Logic Controller Input Conditioning |
Use Scenario: Providing stable excitation voltage to resistive bridge sensors in harsh factory environments. IC Role / Device Role / Timing Role: Zener acts as two-terminal shunt regulator supplying constant bias to sensor elements. Use Value: –65 °C to +150 °C operating range and low ΔVZ (0.15 V) ensure accuracy across thermal cycling. | Use Scenario: Level-shifting and clamping 24 V digital inputs to protect microcontroller GPIO pins. IC Role / Device Role / Timing Role: Clamps input voltage to safe 7.5 V ceiling while sinking fault current. Use Value: 10 µA max reverse leakage at 5.4 V prevents false triggering; axial leads simplify through-hole PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5343B | No e3 RoHS suffix; tin-lead plating instead of matte-tin | Same electrical specs but not compliant with EU RoHS Directive 2011/65/EU | Select when legacy tin-lead assembly is required and RoHS exemption applies |
| SMBJ5343B | Surface-mount SMB package (JEDEC DO-214AA); same 7.5 V ±5% VZ, but higher ZZ (2.0 Ω) and lower IZSM (12 A) | Designed for automated SMT assembly; unsuitable for axial-leaded through-hole layouts | Choose for space-constrained PCBs where reflow compatibility and smaller footprint are critical |
Compared with 1N5343B and SMBJ5343B, the 1N5343BE3/TR12 uniquely combines RoHS compliance, axial-leaded mechanical robustness, and full 5 W power capability in tape-and-reel packaging-making it optimal for high-reliability through-hole production requiring environmental compliance and surge resilience.
Availability
1N5343BE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, motor drive protection circuits, and sensor excitation systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5343BE3/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N53xxB series was developed specifically for ruggedized 5 W Zener regulation in mission-critical power conditioning and protection applications where thermal stability and surge resilience are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5343BE3/TR12?
The 1N5343BE3/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its nominal 7.5 V regulation voltage falls within 7.125 V to 7.875 V at 175 mA test current and 25 °C lead temperature. The e3 suffix confirms RoHS compliance but does not affect voltage tolerance.
How much power can the 1N5343BE3/TR12 dissipate continuously?
The 1N5343BE3/TR12 is rated for 5.0 W steady-state power dissipation when lead temperature (TL) is maintained below 25 °C using a 3/8″ (10 mm) lead length from the body. Derating is required above 25 °C at 20 mW/°C, per Figure 1 in the official datasheet. On FR4 PCB with 1 oz copper, its usable power drops to 1.47 W at 25 °C ambient.
What is the maximum reverse leakage current for the 1N5343BE3/TR12?
The 1N5343BE3/TR12 exhibits a maximum reverse leakage current (IR) of 10 µA when tested at 5.4 V (72% of nominal VZ). This value is specified for devices with B, C, or D suffixes and reflects low standby power consumption-critical for battery-backed or low-power reference designs.
Does the 1N5343BE3/TR12 require dry packing before PCB assembly?
No, the 1N5343BE3/TR12 has moisture sensitivity level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ≤30 °C/60% RH without dry pack or baking. This eliminates moisture-related popcorning risk during reflow and reduces manufacturing process steps.
What does the "TR12" suffix indicate in 1N5343BE3/TR12?
The "TR12" suffix indicates tape-and-reel packaging per EIA-296 standard, with 12,000 units per reel. This format supports automated pick-and-place assembly and ensures consistent orientation (cathode band facing same direction) for high-volume production. The base part remains electrically identical to bulk or ammo-pack versions.
1N5343BE3/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):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5.4 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
1N5343BE3/TR12 FAQ
1.How can I place an order for 1N5343BE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343BE3/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 1N5343BE3/TR12 reliable?
The price and inventory of 1N5343BE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343BE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5343BE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343BE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343BE3/TR12?
1N5343BE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343BE3/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 1N5343BE3/TR12?
For technical support, including 1N5343BE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343BE3/TR12 requirements.
6.How does Aetrix verify that 1N5343BE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5343BE3/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 1N5343BE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5343BE3/TR12?
All 1N5343BE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343BE3/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 1N5343BE3/TR12 part is unused and in its original packaging.
Return procedure for 1N5343BE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343BE3/TR12 Tags
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MM5Z5V1ST1G
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