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Microchip Technology 1N5340/TR8
- Part No.:
- 1N5340/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5340/TR8.pdf
- Description:
- DIODE ZENER 6V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,450
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Product details
Overview
1N5340/TR8 from Microsemi is a 6.0 V, ±5% tolerance, 5 W axial-leaded silicon Zener diode optimized for voltage regulation in power supply feedback loops, overvoltage protection circuits, and precision reference applications. It delivers stable regulation at 200 mA test current with 1.0 Ω dynamic impedance and operates across –65°C to +150°C.
For engineers reviewing the 1N5340/TR8 datasheet, 1N5340/TR8 pinout, 1N5340/TR8 application, or 1N5340/TR8 equivalent, this page provides verified electrical parameters, thermal derating behavior, JEDEC T-18 package details, and direct alternatives for industrial power management designs.
Technical Context
This Zener operates in reverse breakdown mode with cathode-banded polarity, requiring the banded end to be held positive relative to the anode. Its 25 °C/W junction-to-lead thermal resistance enables 5 W dissipation when leads are mounted at 3/8" (10 mm) from body with adequate heat sinking.
Regulation performance is defined by voltage regulation ΔVZ = 0.19 V (difference between VZ at 10% and 50% of IZM), and it maintains low dynamic impedance (ZZ = 1.0 Ω) at IZT = 200 mA, ensuring minimal output variation under load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.0 V ±5% - precise regulation point for 5–7 V rail stabilization |
| Test Current (IZT) | 200 mA - operating point where VZ and ZZ are specified |
| Dynamic Impedance (ZZ) | 1.0 Ω - low AC resistance ensures tight voltage control during current changes |
| Max Regulator Current (IZM) | 790 mA - maximum DC current at 25°C before exceeding 5 W power limit |
| Power Dissipation (PD) | 5.0 W at TL = 25°C - requires lead-length thermal management for full rating |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead value enabling thermal design with measured lead temperature |
| Surge Current (IZSM) | 12.7 A - peak non-repetitive half-sine (8.3 ms) capability for transient suppression |
Pinout & Package
Package: JEDEC T-18 axial-leaded plastic encapsulated case per MIL-PRF-19500; void-free UL94V-0 epoxy body; cathode indicated by color band; RoHS-compliant matte-tin plating; weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased current sink | Connected to lower-potential node; carries full Zener current in regulation |
| Cathode | Regulated output reference | Banded end; held at stable 6.0 V above anode; used as voltage reference or clamp |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered T-18 package | Standardized mechanical interface compatible with automated axial insertion and wave soldering |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake step prior to assembly |
| ±5% voltage tolerance (B suffix) | Tighter regulation than generic Zeners, reducing need for post-calibration trimming |
| Low ΔVZ = 0.19 V | Minimal voltage shift across 10–50% IZM, critical for stable feedback in SMPS controllers |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust handling without special ESD controls during board assembly and test |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated 12 V DC-DC converter to regulate output voltage. IC Role / Device Role / Timing Role: Provides precise 6.0 V reference to TL431 shunt regulator input, enabling accurate secondary-side voltage sensing. Use Value: ±5% tolerance and low ΔVZ ensure output stays within ±1.5% over line/load/temperature, meeting EN 62368-1 requirements. | Use Scenario: Placed across 5 V logic rail to prevent damage from accidental 12 V misconnection or LDO dropout failure. IC Role / Device Role / Timing Role: Acts as passive crowbar element, clamping rail to 6.0 V + forward drop before downstream ICs exceed absolute maximum ratings. Use Value: 12.7 A surge rating absorbs 8.3 ms transients without degradation, validated per IEC 61000-4-5 Level 3. |
| Precision Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Supplies excitation voltage to bridge-based pressure sensor in HVAC controller PCB. IC Role / Device Role / Timing Role: Serves as stable 6.0 V reference for ratiometric ADC measurement, eliminating need for dedicated reference IC. Use Value: 1.0 Ω ZZ minimizes loading error on sensor bridge; operation up to +150°C supports under-hood automotive variants. | Use Scenario: Powers 4–20 mA transmitter loop in process automation field device with wide ambient range. IC Role / Device Role / Timing Role: Regulates loop supply voltage to maintain constant current source accuracy despite input ripple or battery sag. Use Value: 5 W rating allows sustained operation at 200 mA even at elevated ambient temperatures, supporting IP67-rated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5340B | Same electrical specs but bulk packaging (no tape-and-reel); no TR8 suffix | Not suitable for automated pick-and-place; requires manual or vibratory feed | Select 1N5340B only for prototyping or low-volume hand-soldered builds |
| MMBZ5234B-TP | Surface-mount SOT-23 package; 6.0 V ±5%; 200 mW rating (not 5 W) | Cannot replace 1N5340/TR8 in high-power regulation; limited to signal-level biasing | Choose MMBZ5234B-TP only for space-constrained low-current references, not power regulation |
Compared with 1N5340B and MMBZ5234B-TP, the 1N5340/TR8 uniquely combines tape-and-reel automation readiness, 5 W power handling, and axial T-18 mechanical robustness-making it the only option for high-reliability, high-current industrial power regulation with automated manufacturing support.
Availability
1N5340/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, precision analog references, and sensor excitation systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N5340/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 U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized voltage regulation in harsh-environment power systems where long-term stability, surge resilience, and extended temperature operation are mandatory.
FAQ
What is the Zener voltage tolerance for 1N5340/TR8?
The 1N5340/TR8 has a ±5% Zener voltage tolerance, confirmed by its "B" suffix per Microsemi's datasheet. This means its nominal 6.0 V regulation point falls between 5.7 V and 6.3 V at 200 mA test current and 25°C lead temperature. The tolerance is guaranteed across the full operating temperature range of –65°C to +150°C, and applies to every unit shipped in the 1N5340/TR8 reel.
Can 1N5340/TR8 be used in surface-mount designs?
No, the 1N5340/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. Microsemi offers surface-mount equivalents such as SMBJ5340B, but those differ in package, thermal performance, and surge rating. Substituting 1N5340/TR8 into an SMT footprint would require mechanical rework and invalidate thermal and reliability validation.
What is the maximum continuous current for 1N5340/TR8 at 70°C ambient?
At 70°C ambient on an FR4 board (1 oz Cu, 4 mm² pads), the 1N5340/TR8 derates to approximately 2.94 W, supporting ~490 mA continuous current (calculated as PD / VZ). This assumes proper copper land pattern per Microsemi's thermal guidelines; exceeding this current risks thermal runaway due to rising Zener voltage with temperature.
Does 1N5340/TR8 meet RoHS requirements?
Yes, the 1N5340/TR8 is RoHS compliant, as indicated by the "e3" suffix in Microsemi's official documentation. It uses annealed matte-tin plating and void-free UL94V-0 epoxy, with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. Full compliance data is available in Microchip's material declaration for this part.
How does the 1N5340/TR8 compare to the 1N4735A in terms of power handling?
The 1N5340/TR8 is rated for 5 W continuous dissipation with 25 °C/W junction-to-lead thermal resistance, while the 1N4735A is a 1 W device with ~50 °C/W thermal resistance. At identical 6.2 V rating, the 1N5340/TR8 supports over 3× higher current and survives significantly larger surge events (12.7 A vs. ~2.5 A), making it suitable for industrial-grade power regulation where the 1N4735A would thermally fail.
1N5340/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):
- 6 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 3 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
1N5340/TR8 FAQ
1.How can I place an order for 1N5340/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5340/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 1N5340/TR8 reliable?
The price and inventory of 1N5340/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5340/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5340/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5340/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5340/TR8?
1N5340/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5340/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 1N5340/TR8?
For technical support, including 1N5340/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5340/TR8 requirements.
6.How does Aetrix verify that 1N5340/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5340/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 1N5340/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5340/TR8?
All 1N5340/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5340/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 1N5340/TR8 part is unused and in its original packaging.
Return procedure for 1N5340/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5340/TR8 Tags
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