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Microchip Technology 1N5355E3/TR12
- Part No.:
- 1N5355E3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5355E3/TR12.pdf
- Description:
- DIODE ZENER 18V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,653
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Product details
Overview
1N5355E3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 18 V, ±5% tolerance (B-suffix equivalent), 65 mA test current, 2.5 Ω maximum dynamic impedance at IZT, and 75 mA maximum Zener current (IZM) when adequately heat-sunk. It serves as a precision voltage reference or shunt regulator in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N5355E3/TR12 datasheet, 1N5355E3/TR12 pinout, 1N5355E3/TR12 application, or 1N5355E3/TR12 equivalent, key selection criteria include its 18 V Zener voltage, 5 W steady-state power rating at TL < 25°C, ±5% tolerance, low 2.5 Ω dynamic impedance, and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device operates as a shunt-connected voltage regulator, maintaining stable output voltage across wide variations in load current and temperature. Its design centers on low thermal resistance (25 °C/W junction-to-lead at 10 mm lead length) and high surge capability (170 A non-recurrent half-sine, 8.3 ms).
It exhibits minimal voltage drift versus current-ΔVZ ≤ 0.40 V between 10% and 50% of IZM-and maintains regulation down to 0.5 μA reverse leakage at VR = 14.4 V, supporting low-power biasing and sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, ±5% tolerance - defines precise regulation point for feedback or clamping |
| Test Current (IZT) | 65 mA - operating point where VZ and ZZ are specified; sets minimum bias requirement |
| Dynamic Impedance (ZZ) | 2.5 Ω max at IZT - ensures tight voltage stability under varying load currents |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current before exceeding 5 W dissipation at TL < 25°C |
| Reverse Leakage (IR) | 0.5 μA max at VR = 14.4 V - enables low-quiescent-current standby operation |
| Voltage Regulation (ΔVZ) | 0.40 V max - difference between VZ measured at 10% and 50% of IZM; quantifies regulation linearity |
| Surge Current (IZSM) | 170 A peak (8.3 ms half-sine) - supports transient overvoltage suppression without failure |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables high-power operation with simple lead heatsinking |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant annealed matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during reverse breakdown | Connected to lower-potential node (e.g., ground or return path) in shunt regulator configuration |
| Cathode | Regulated output node | 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 | Industry-standard footprint and reliability; compatible with legacy axial-lead PCB layouts and automated insertion |
| ±5% voltage tolerance | Ensures predictable regulation without post-manufacture trimming; suitable for mid-precision feedback paths |
| RoHS-compliant e3 suffix | Lead-free matte-tin plating meets environmental compliance without sacrificing solderability or reliability |
| Level 1 moisture sensitivity | No dry-pack required; eliminates bake-out step prior to reflow or wave soldering |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust handling in assembly environments; no special ESD controls needed during board integration |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter secondary-side feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Shunt reference providing stable 18 V reference to TL431 or similar error amplifier input. Use Value: Maintains ±1.5% output regulation across line/load/temperature with 2.5 Ω dynamic impedance minimizing feedback loop gain variation. | Use Scenario: Clamps transient voltage spikes on 15–24 V DC rails caused by inductive switching or load dump in automotive body electronics. IC Role / Device Role / Timing Role: Passive shunt clamp absorbing energy during overvoltage events up to 170 A surge (8.3 ms). Use Value: Prevents downstream IC damage by limiting rail voltage to 18.7 V (VZ + ΔVZ) while surviving repeated surges without degradation. |
| Low-Power Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Provides stable excitation voltage for precision resistive sensors (e.g., RTDs, strain gauges) in battery-powered data loggers. IC Role / Device Role / Timing Role: Low-leakage (0.5 μA) Zener reference generating 18 V bias for ratiometric measurement circuitry. Use Value: Enables 16-bit ADC accuracy by reducing reference drift contribution; operates continuously at <1 mW quiescent power. | Use Scenario: Supplies regulated bias to 4–20 mA transmitter front-end circuitry in hazardous-area process instrumentation. IC Role / Device Role / Timing Role: Intrinsically safe shunt regulator limiting loop voltage to 18 V in two-wire current-loop transmitters. Use Value: Complies with IEC 60079-11 safety standards by guaranteeing <20 V open-circuit voltage under fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355B | Same 18 V, ±5%, 5 W rating but with SnPb plating and no e3/RoHS designation | Not suitable for RoHS-compliant production; requires exemption documentation for lead-free programs | Select only for legacy repair or non-RoHS military/aerospace builds requiring JAN/JANTX screening prefixes |
| SMBJ5355B | Surface-mount SMB package; identical electrical specs but 85 °C/W junction-to-ambient (vs. 25 °C/W junction-to-lead) | Limited to lower average power in FR4 layouts without thermal pads; unsuitable for high-current shunt regulation | Choose for space-constrained PCBs where 1.47 W max ambient-rated power suffices and axial leads are prohibited |
Compared with 1N5355B and SMBJ5355B, the 1N5355E3/TR12 uniquely combines RoHS compliance, axial-lead mechanical robustness, and superior thermal performance (25 °C/W) for through-hole 5 W regulation-making it optimal for industrial power supplies requiring long-term reliability and regulatory conformance.
Availability
1N5355E3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, low-power voltage references, and industrial sensor excitation systems requiring stable component supply and full RoHS compliance.
Supply support for 1N5355E3/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, RF, and discrete components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems-emphasizing thermal resilience, surge survivability, and JEDEC-standardized axial packaging.
FAQ
What is the Zener voltage tolerance of the 1N5355E3/TR12?
The 1N5355E3/TR12 has a nominal Zener voltage of 18 V with ±5% tolerance, consistent with the "B" suffix in the 1N53xxB family. This tolerance is confirmed in the Electrical Characteristics table on page 1 of the Microsemi datasheet, where 1N5355B (identical electrical spec, non-RoHS) is listed with VZ = 18 V and tolerance noted as ±5%. The e3 suffix denotes RoHS compliance but does not alter voltage tolerance.
Can the 1N5355E3/TR12 be used in surface-mount designs?
No-the 1N5355E3/TR12 uses an axial-leaded T-18 package and is not suitable for surface-mount assembly. For SMT equivalents, Microsemi specifies the SMBJ5355B (SMB package) or SMBG5355B (SMBG package), which share identical electrical characteristics but differ in thermal performance and mounting method. Using 1N5355E3/TR12 in SMT processes would require manual through-hole insertion or adapter hardware.
What is the maximum continuous power dissipation for the 1N5355E3/TR12?
The 1N5355E3/TR12 is rated for 5.0 W steady-state power dissipation at lead temperature (TL) < 25°C with 10 mm (3/8″) lead length from the body. When mounted on FR4 with standard copper pads, its derated power drops to 1.47 W at TA = 25°C due to higher junction-to-ambient thermal resistance (85 °C/W). Full 5 W operation requires adequate lead heatsinking, as detailed in Figure 1 of the datasheet.
Does the 1N5355E3/TR12 meet moisture sensitivity level (MSL) requirements for reflow?
Yes-the 1N5355E3/TR12 has IPC/JEDEC J-STD-020B Level 1 moisture sensitivity classification, meaning it may be stored indefinitely at ≤30°C/60% RH without dry packing or baking prior to soldering. This is explicitly stated in the Features section and confirmed in the Mechanical and Packaging table, eliminating pre-reflow bake cycles in standard manufacturing flow.
What is the reverse leakage current specification for the 1N5355E3/TR12?
The 1N5355E3/TR12 has a maximum reverse leakage current (IR) of 0.5 μA at VR = 14.4 V, as specified in the Electrical Characteristics table for all "B"-suffix parts including 1N5355B. This value reflects operation near the knee of the Zener curve and supports low-power biasing applications where standby current must remain sub-microampere.
1N5355E3/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):
- 18 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 13 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
1N5355E3/TR12 FAQ
1.How can I place an order for 1N5355E3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5355E3/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 1N5355E3/TR12 reliable?
The price and inventory of 1N5355E3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355E3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5355E3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355E3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5355E3/TR12?
1N5355E3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5355E3/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 1N5355E3/TR12?
For technical support, including 1N5355E3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355E3/TR12 requirements.
6.How does Aetrix verify that 1N5355E3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5355E3/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 1N5355E3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5355E3/TR12?
All 1N5355E3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355E3/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 1N5355E3/TR12 part is unused and in its original packaging.
Return procedure for 1N5355E3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5355E3/TR12 Tags
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