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Microchip Technology 1N5355B/TR12
- Part No.:
- 1N5355B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5355B/TR12.pdf
- Description:
- DIODE ZENER 18V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,524
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Product details
Overview
1N5355B/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 18 V ±5%, 2.5 Ω maximum dynamic impedance at 65 mA test current, 75 mA maximum Zener current (IZM), and operating temperature range of –65 °C to +150 °C. It provides stable voltage reference in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.
For engineers reviewing the 1N5355B/TR12 datasheet, 1N5355B/TR12 pinout, 1N5355B/TR12 application, or 1N5355B/TR12 equivalent, key selection criteria include verified ±5% tolerance, low 2.5 Ω Zener impedance at 65 mA, 75 mA IZM under adequate heat sinking, and RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased mode, with cathode indicated by a band and required to be held positive relative to the anode. Its regulation performance is specified at TL = 25 °C with 40 ±10 ms DC current application, and voltage regulation (ΔVZ) is defined as the difference between measurements at 10% and 50% of IZM.
The 1N5355B/TR12 exhibits 0.40 V maximum voltage regulation (ΔVZ), 264 Ω maximum dynamic knee impedance (ZZK) at 1.0 mA, and 5.5 V maximum surge current (IZSM) for non-recurrent 8.3 ms half-sine wave events. Thermal resistance is 25 °C/W junction-to-lead at 3/8″ (10 mm) lead length from body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±5% - precise regulation point for feedback and clamping at nominal 18 V |
| Test Current (IZT) | 65 mA - standardized bias point for measuring VZ and ZZ |
| Dynamic Impedance (ZZ) | 2.5 Ω max - low AC impedance ensures minimal voltage shift under load transients |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current at TL < 25 °C with 3/8″ lead length |
| Power Dissipation | 5.0 W at TL < 25 °C - thermal design must maintain lead temperature below threshold |
| Operating Temperature | –65 °C to +150 °C - suitable for industrial, aerospace, and under-hood automotive environments |
| Reverse Leakage (IR) | 0.5 μA max at VR = 14.4 V - negligible standby current in high-impedance bias networks |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-201AD; void-free thermosetting epoxy body (UL94V-0), tin-lead or RoHS-compliant matte-tin plating, cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in reverse-bias configuration | Connected to system ground or lower-potential rail; current flows into cathode during regulation |
| Cathode | Regulated output node | Banded end; held positive relative to anode; delivers stable 18 V when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures cross-manufacturer compatibility and standardized mechanical/electrical behavior |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust handling in standard manufacturing without special ESD controls |
| High surge current rating (5.5 A) | Withstands transient overvoltage events such as load dump or inductive kickback |
| e3 RoHS-compliant marking | Meets EU RoHS Directive 2011/65/EU with lead-free matte-tin plating |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback path via optocoupler interface. IC Role / Device Role / Timing Role: Precision voltage reference establishing error amplifier setpoint. Use Value: ±5% tolerance and low 2.5 Ω dynamic impedance ensure tight output regulation across line/load variations. |
Use Scenario: Clamps transient voltages on 12–24 V DC rails during load dump or relay switching. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting excess energy to ground. Use Value: 5.5 A surge rating and 0.40 V ΔVZ enable reliable clamping without thermal runaway. |
| Programmable Reference Bias | Industrial Sensor Excitation |
Use Scenario: Provides stable excitation voltage for precision op-amp-based current sources or DAC references. IC Role / Device Role / Timing Role: Low-drift, low-noise DC reference node in analog signal chains. Use Value: 0.5 μA IR at 14.4 V minimizes loading error in high-impedance bias networks. |
Use Scenario: Supplies regulated excitation to RTD or strain gauge bridges in PLC analog input modules. IC Role / Device Role / Timing Role: Stable 18 V source maintaining bridge balance and measurement accuracy. Use Value: –65 °C to +150 °C operation supports extended temperature industrial deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355B (bulk) | Identical electrical specs; differs only in packaging - no tape-and-reel (TR) carrier | No automated pick-and-place support; manual or bulk insertion only | Select 1N5355B/TR12 for SMT production lines requiring EIA-296 compliant tape-and-reel delivery |
| MMBZ5245B (SOT-23) | Same 18 V ±5% VZ but rated at 0.5 W; surface-mount; 100 Ω typical ZZ | Limited to low-power biasing; unsuitable for 5 W dissipation or surge clamping | Choose MMBZ5245B only for space-constrained PCBs where power < 0.3 W and surge immunity is not required |
Compared with 1N5355B (bulk) and MMBZ5245B, the 1N5355B/TR12 uniquely combines full 5 W power handling, axial-leaded through-hole robustness, and EIA-296 tape-and-reel compatibility - making it optimal for industrial power supplies requiring field-replaceable, high-surge-capable Zeners.
Availability
1N5355B/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor excitation systems requiring stable component supply with traceable sourcing and long-term lifecycle continuity.
Supply support for 1N5355B/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in mission-critical power systems where stability across wide temperature ranges and resilience to electrical surges are mandatory.
FAQ
What is the Zener voltage tolerance for 1N5355B/TR12?
The 1N5355B/TR12 has a nominal Zener voltage of 18 V with a tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This tolerance is verified at TL = 25 °C using a 40 ±10 ms DC test current pulse. The 1N5355B/TR12 does not support tighter tolerances like ±1% or ±2% - those require C or D suffix variants.
Can 1N5355B/TR12 be used in surface-mount designs?
No, the 1N5355B/TR12 uses a T-18 axial-leaded package (JEDEC DO-201AD) and is intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5355B in SMB package or SMBG5355B in SMBG package - both share identical 18 V ±5% regulation but differ in thermal and mechanical characteristics.
What is the maximum surge current rating for 1N5355B/TR12?
The 1N5355B/TR12 has a maximum non-recurrent surge current (IZSM) of 5.5 A, specified for an 8.3 ms half-sine waveform. This value is derived from its 5 W power rating and 18 V Zener voltage, enabling reliable clamping of transient overvoltages in automotive and industrial power systems.
Is 1N5355B/TR12 RoHS compliant?
Yes, the "e3" suffix in the full manufacturer designation confirms RoHS compliance. The 1N5355B/TR12 uses RoHS-compliant annealed matte-tin plating on leads, meeting EU Directive 2011/65/EU, and carries moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B - no dry pack required.
How does thermal resistance affect 1N5355B/TR12 derating?
The 1N5355B/TR12 has a junction-to-lead thermal resistance of 25 °C/W at 3/8″ (10 mm) lead length. When ambient temperature exceeds 25 °C or lead length shortens, power must be linearly derated - e.g., at TL = 75 °C, maximum dissipation drops to 3.75 W. Derating curves are provided in Figure 1 of the Microsemi datasheet.
1N5355B/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:
- ±5%
- 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
1N5355B/TR12 FAQ
1.How can I place an order for 1N5355B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5355B/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 1N5355B/TR12 reliable?
The price and inventory of 1N5355B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5355B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5355B/TR12?
1N5355B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5355B/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 1N5355B/TR12?
For technical support, including 1N5355B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355B/TR12 requirements.
6.How does Aetrix verify that 1N5355B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5355B/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 1N5355B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5355B/TR12?
All 1N5355B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355B/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 1N5355B/TR12 part is unused and in its original packaging.
Return procedure for 1N5355B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5355B/TR12 Tags
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