My Inquiry
My Account
Microchip Technology 1N5355A/TR8
- Part No.:
- 1N5355A/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5355A/TR8.pdf
- Description:
- DIODE ZENER 18V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,978
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5355A/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 18 V, ±10% tolerance (A suffix), 65 mA test current (IZT), 2.5 Ω maximum 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 where stable 18 V clamping is required.
For engineers reviewing the 1N5355A/TR8 datasheet, 1N5355A/TR8 pinout, 1N5355A/TR8 application, or 1N5355A/TR8 equivalent, key selection criteria include its 18 V Zener voltage, ±10% tolerance, 5 W power rating, axial T-18 package, and compatibility with tape-and-reel (TR8) automated assembly.
Technical Context
This device operates as a voltage-reference diode in reverse-biased mode, maintaining stable output voltage across a wide operating current range (10–75 mA) and temperature span (−65 °C to +150 °C). Its low dynamic impedance (2.5 Ω) ensures minimal voltage variation under load changes, while its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with 3/8″ lead length heat sinking.
The 1N5355A/TR8 features cathode band polarity marking, RoHS-compliant matte-tin plating, UL94V-0 epoxy encapsulation, and moisture sensitivity level 1 - eliminating dry-pack requirements. It withstands 8.3 ms half-sine surge currents up to 75 A and exhibits ≤0.40 V voltage regulation (ΔVZ) between 10% and 50% of IZM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±10% - precise 18 V regulation point for feedback and clamp circuits |
| Test Current (IZT) | 65 mA - standardized bias point for measuring VZ and ZZ |
| Max Dynamic Impedance (ZZ) | 2.5 Ω - low AC resistance ensures tight voltage stability under varying load |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current at TL = 25 °C with adequate heatsinking |
| Power Dissipation | 5.0 W at TL < 25 °C (3/8″ lead length) - defines thermal design envelope |
| Voltage Regulation (ΔVZ) | 0.40 V - difference between VZ measured at 10% and 50% of IZM |
| Surge Current (IZSM) | 75 A (8.3 ms half-sine) - peak non-repetitive surge capability for transient suppression |
Pinout & Package
Package: Axial-leaded T-18 plastic case per JEDEC DO-204AL standard; cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated; weight 0.7 g; moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail in shunt regulator configuration |
| Cathode | Reverse-biased Zener terminal / regulated output node | Banded end; connected to input rail or voltage source; delivers stable 18 V to load |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard DO-204AL mechanical and electrical definitions |
| ±10% voltage tolerance (A suffix) | Cost-optimized tolerance for non-critical reference and clamp applications |
| 5 W steady-state power rating | Enables robust overvoltage protection without external series resistors in medium-power designs |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during manual or automated assembly |
| Tape-and-reel packaging (TR8) | Supports high-volume SMT-compatible pick-and-place integration despite axial form factor |
Applications
| Switch-Mode Power Supply Feedback | DC Motor Overvoltage Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converter feedback loop via optocoupler interface. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 18 V threshold for error amplifier comparison. Use Value: Maintains ±1% output regulation across line/load variations due to low ΔVZ (0.40 V) and stable VZ over temperature. |
Use Scenario: Suppresses inductive kickback spikes during DC motor turn-off in industrial actuators. IC Role / Device Role / Timing Role: Passive clamp element absorbing energy from motor winding inductance. Use Value: Withstands 75 A surge current (8.3 ms) without degradation, protecting MOSFET switches from avalanche failure. |
| Programmable Logic Controller Input Protection | Industrial Sensor Reference Voltage |
Use Scenario: Limits input voltage to PLC digital input stage exposed to field wiring transients. IC Role / Device Role / Timing Role: Primary overvoltage protection device placed before TVS and series resistor. Use Value: Provides predictable 18 V clamping with low ZZ (2.5 Ω), reducing stress on downstream components during fast transients. |
Use Scenario: Supplies stable reference voltage to analog sensor signal conditioning circuitry in harsh environments. IC Role / Device Role / Timing Role: Precision voltage reference for ADC biasing and op-amp offset compensation. Use Value: Delivers stable 18 V across −65 °C to +150 °C with minimal drift, enabling accurate sensor calibration over full industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355B/TR8 | Same 18 V nominal VZ, but ±5% tolerance (B suffix) and higher IZM (75 mA vs. 75 mA - identical for this variant); identical ZZ (2.5 Ω) | Used where tighter voltage accuracy is required in feedback or precision clamp circuits | Select when ±5% tolerance improves system regulation margin without changing layout or thermal design |
| MMBZ5245B-TP | Surface-mount SOT-23 package; 18 V ±5%; 200 mW rating; 30 Ω ZZ; 10 mA IZM - not power-equivalent | Limited to low-power signal-level clamping or biasing; unsuitable for 5 W dissipation | Choose only for space-constrained PCBs where power demand is <200 mW and thermal mass is insufficient for axial devices |
Compared with 1N5355A/TR8, the 1N5355B/TR8 offers improved voltage accuracy at identical power handling, while MMBZ5245B-TP provides footprint reduction at the cost of >95% power derating - making it viable only for signal integrity, not power regulation.
Availability
1N5355A/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, motor control systems, and programmable logic controller (PLC) input protection requiring stable component supply and long-term obsolescence management.
Supply support for 1N5355A/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 1N53xxA/B series was designed for ruggedized voltage regulation in mission-critical power systems where extended temperature operation, surge resilience, and JEDEC-standard reliability are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5355A/TR8?
The 1N5355A/TR8 has a Zener voltage tolerance of ±10%, as indicated by the "A" suffix in its part number. This means its actual breakdown voltage falls within 16.2 V to 19.8 V at the specified test current of 65 mA and 25 °C lead temperature. This tolerance is confirmed in the manufacturer's datasheet revision D, Table of Electrical Characteristics.
Can the 1N5355A/TR8 be used in surface-mount designs?
The 1N5355A/TR8 is an axial-leaded T-18 package and is not a surface-mount device. However, it is supplied in tape-and-reel (TR8) format for automated axial insertion equipment. For true SMT implementation, Microsemi offers the SMBJ5355A as a surface-mount equivalent - same 18 V ±10% rating but in DO-214AA package with different thermal and current ratings.
What is the maximum surge current rating for the 1N5355A/TR8?
The 1N5355A/TR8 is rated for a maximum non-repetitive surge current (IZSM) of 75 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is validated per JEDEC standards and enables reliable transient suppression in motor drive and power supply applications without device failure.
How does the thermal resistance of the 1N5355A/TR8 affect its power handling?
The 1N5355A/TR8 has a junction-to-lead thermal resistance of 25 °C/W when mounted with 3/8″ (10 mm) lead length from the body. At ambient temperatures above 25 °C, its 5 W power rating 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 official datasheet.
Is the 1N5355A/TR8 RoHS compliant?
Yes, the 1N5355A/TR8 is RoHS compliant, as confirmed by the "e3" designation in the product family documentation and Microsemi's compliance statements. Its leads feature RoHS-compliant annealed matte-tin plating, and the void-free thermosetting epoxy body meets UL94V-0 flammability requirements.
1N5355A/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):
- 18 V
- Tolerance:
- ±10%
- 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
1N5355A/TR8 FAQ
1.How can I place an order for 1N5355A/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5355A/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 1N5355A/TR8 reliable?
The price and inventory of 1N5355A/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355A/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5355A/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355A/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5355A/TR8?
1N5355A/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5355A/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 1N5355A/TR8?
For technical support, including 1N5355A/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355A/TR8 requirements.
6.How does Aetrix verify that 1N5355A/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5355A/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 1N5355A/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5355A/TR8?
All 1N5355A/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355A/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 1N5355A/TR8 part is unused and in its original packaging.
Return procedure for 1N5355A/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5355A/TR8 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…
