My Inquiry
My Account
Microchip Technology 1N5355BE3/TR12
- Part No.:
- 1N5355BE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5355BE3/TR12.pdf
- Description:
- DIODE ZENER 18V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,999
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5355BE3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 18 V, ±5% tolerance (B suffix), 65 mA test current (IZT), 2.5 Ω dynamic impedance (ZZ), and 75 mA maximum Zener current (IZM) at 25°C lead temperature. It regulates voltage in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.
For engineers reviewing the 1N5355BE3/TR12 datasheet, 1N5355BE3/TR12 pinout, 1N5355BE3/TR12 application, or 1N5355BE3/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (75 A), voltage regulation (ΔVZ = 0.40 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its low dynamic impedance (2.5 Ω) ensures minimal voltage deviation across 10–50% of IZM, and its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with 3/8″ (10 mm) lead length heat sinking.
The 1N5355BE3/TR12 is rated for -65°C to +150°C operating temperature, features moisture sensitivity level 1 (no dry pack required), and meets MIL-STD-750 Method 1020 for ESD insensitivity. Its cathode band marking and axial-leaded T-18 package support through-hole mounting in high-reliability analog and power management circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±5% - precise regulation point for feedback networks requiring tight voltage reference stability |
| Test Current (IZT) | 65 mA - operating point where VZ and ZZ are specified; defines minimum bias for stable regulation |
| Dynamic Impedance (ZZ) | 2.5 Ω - low AC resistance ensures <0.4 V variation between 10% and 50% of IZM |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current at TL = 25°C with adequate heat sinking |
| Power Dissipation | 5.0 W at TL < 25°C - full-rated power achievable only with controlled lead temperature |
| Thermal Resistance | 25 °C/W junction-to-lead - enables thermal design using 3/8″ lead length as heatsink path |
| Surge Current (IZSM) | 75 A (8.3 ms half-sine) - supports transient overvoltage clamping without failure |
Pinout & Package
T-18 axial-leaded plastic package with void-free UL94V-0 epoxy body; cathode indicated by colored band; leads plated with RoHS-compliant annealed matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased reference terminal | Connected to lower-potential node; forms regulated voltage drop with cathode |
| Cathode | Reverse-biased reference terminal | Banded end; connected to higher-potential node; defines regulated output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables accurate voltage setting in precision feedback paths without external trimming |
| 25 °C/W junction-to-lead thermal resistance | Allows full 5 W operation with simple mechanical heat sinking via lead length |
| 75 A non-recurrent surge rating | Provides robust transient suppression in input-stage protection circuits |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to assembly |
| RoHS-compliant matte-tin plating | Ensures solderability and reliability in lead-free reflow processes |
Applications
| Industrial Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback loops using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Voltage reference element defining setpoint for secondary-side regulation. Use Value: 18 V Zener voltage matches common TL431 bias requirements; ±5% tolerance ensures <±1% output regulation error. | Use Scenario: Clamping transient surges on 24 V DC input rails in PLC I/O modules subjected to inductive switching noise. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground during voltage spikes. Use Value: 75 A surge rating handles repetitive 50 A transients; 2.5 Ω ZZ limits clamping voltage overshoot to <0.4 V above 18 V. |
| Reference Voltage Generator | DC-DC Converter Bias Supply |
Use Scenario: Generating stable 18 V reference for analog sensor signal conditioning circuits in harsh-temperature environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Precision voltage source providing excitation and offset calibration points. Use Value: -65°C to +150°C operating range ensures functionality across extended industrial temperature profiles; low ΔVZ minimizes drift with load changes. | Use Scenario: Providing startup bias to primary-side controller ICs in offline AC-DC adapters before auxiliary winding becomes active. IC Role / Device Role / Timing Role: High-current Zener supplying regulated gate drive or VCC to PWM controllers during initial power-up. Use Value: 75 mA IZM supports >10 mA sustained bias current; 5 W rating tolerates brief inrush without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355BRLG | Same 18 V ±5%, 5 W rating, but in bulk packaging (no tape/reel); no TR12 suffix | No reel-based automated placement support; suitable for manual or low-volume assembly | Select 1N5355BRLG when tape-and-reel is unnecessary and cost-per-unit is prioritized |
| MMBZ5245BS-7-F | Surface-mount SOD-123 package; 18 V ±5%, but only 0.35 W power rating and 100 mA IZM | Limited to low-power bias/reference roles; cannot replace 1N5355BE3/TR12 in 5 W applications | Select MMBZ5245BS-7-F only for space-constrained PCBs where thermal load is <0.35 W |
Compared with 1N5355BE3/TR12, 1N5355BRLG offers identical electrical performance in bulk form, while MMBZ5245BS-7-F provides footprint reduction at the cost of 93% lower power handling-making it unsuitable for any application requiring >0.35 W dissipation or >100 mA surge current.
Availability
1N5355BE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, reference voltage generators, and DC-DC converter bias supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5355BE3/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 power management components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in mission-critical power systems where thermal stability, surge resilience, and long-term parametric consistency are essential.
FAQ
What is the Zener voltage tolerance of the 1N5355BE3/TR12?
The 1N5355BE3/TR12 has a Zener voltage tolerance of ±5%, indicated by the "B" suffix in its part number. This means its measured breakdown voltage at 65 mA test current falls within 17.1 V to 18.9 V at 25°C lead temperature. The e3 suffix confirms RoHS compliance, and TR12 denotes tape-and-reel packaging per EIA-296 standard. This tolerance enables use in applications requiring tighter regulation than ±10% or ±20% variants.
What is the maximum continuous power dissipation for the 1N5355BE3/TR12?
The 1N5355BE3/TR12 is rated for 5.0 W steady-state power dissipation at a lead temperature (TL) below 25°C, with derating to zero at TL = 150°C. Its thermal resistance is 25 °C/W junction-to-lead at 3/8″ (10 mm) lead length. When mounted on FR4 with 1 oz copper, its ambient-rated power drops to 1.47 W due to higher junction-to-ambient resistance (85 °C/W). Full 5 W operation requires direct lead heat sinking.
Does the 1N5355BE3/TR12 have surge current capability, and what is its rating?
Yes, the 1N5355BE3/TR12 supports a non-recurrent surge current (IZSM) of 75 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating allows the device to absorb transient overvoltages-such as those from inductive load switching or lightning-induced surges-without degradation. The surge capability is enabled by its 5 W construction and low thermal mass, making it suitable for primary-side clamp and input rail protection in industrial power systems.
How is polarity marked on the 1N5355BE3/TR12, and how must it be connected?
The 1N5355BE3/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be connected to the higher-potential node in reverse-bias configuration. For proper Zener operation, the anode connects to the lower-potential node (e.g., ground or return path), establishing a regulated voltage drop from cathode to anode. Forward voltage is ≤1.2 V at 1.0 A, but the device is intended for reverse-bias regulation only.
What packaging format does the 1N5355BE3/TR12 use, and what standards does it meet?
The 1N5355BE3/TR12 is supplied in tape-and-reel format per EIA-296 standard, indicated by the "TR12" suffix. Its T-18 axial-leaded package features a void-free UL94V-0 epoxy body, matte-tin-plated leads compliant with MIL-STD-750 Method 2026, and moisture sensitivity level 1 (no dry pack required). The e3 suffix certifies RoHS compliance, and the device meets JEDEC registration requirements for the 1N53xxB series.
1N5355BE3/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
1N5355BE3/TR12 FAQ
1.How can I place an order for 1N5355BE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5355BE3/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 1N5355BE3/TR12 reliable?
The price and inventory of 1N5355BE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355BE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5355BE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355BE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5355BE3/TR12?
1N5355BE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5355BE3/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 1N5355BE3/TR12?
For technical support, including 1N5355BE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355BE3/TR12 requirements.
6.How does Aetrix verify that 1N5355BE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5355BE3/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 1N5355BE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5355BE3/TR12?
All 1N5355BE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355BE3/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 1N5355BE3/TR12 part is unused and in its original packaging.
Return procedure for 1N5355BE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5355BE3/TR12 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
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
