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Microchip Technology 1N5356A/TR12
- Part No.:
- 1N5356A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5356A/TR12.pdf
- Description:
- DIODE ZENER 19V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,306
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Product details
Overview
1N5356A/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 19 V, ±10% tolerance (A suffix), 65 mA test current (IZT), 3.0 Ω maximum dynamic impedance (ZZ), and 75 mA maximum Zener current (IZM). It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5356A/TR12 datasheet, 1N5356A/TR12 pinout, 1N5356A/TR12 application, or 1N5356A/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (250 A), voltage regulation (ΔVZ = 0.40 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across wide operating current (10–75 mA) and temperature (–65 °C to +150 °C) ranges. Its low dynamic impedance (3.0 Ω) and tight ΔVZ (0.40 V) ensure minimal voltage drift under load variation.
Designed for axial-lead through-hole mounting on FR4 PCBs with 4 mm² copper pads, it achieves 1.47 W steady-state power at TA = 25 °C and requires no dry pack (Moisture Sensitivity Level 1 per J-STD-020B). Polarity is marked by cathode band; operation requires banded end positive relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19 V ±10% - defines regulation setpoint for feedback or clamping circuits |
| Test Current (IZT) | 65 mA - standard bias point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 3.0 Ω max - determines output voltage stability under current transients |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current before thermal derating applies |
| Voltage Regulation (ΔVZ) | 0.40 V - difference between VZ at 10% and 50% of IZM; quantifies regulation linearity |
| Surge Current (IZSM) | 250 A - peak non-repetitive half-sine (8.3 ms) capability for transient suppression |
| Thermal Resistance | 25 °C/W junction-to-lead - enables 5 W dissipation with modest heatsinking at 3/8″ lead length |
Pinout & Package
Package: T-18 axial-leaded plastic case (Void-free UL94V-0 epoxy), cathode indicated by band, leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse-bias polarity requires cathode at higher potential |
| Cathode (banded end) | Regulated output node | Provides stable 19 V reference when reverse-biased above breakdown; carries full Zener current |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xx mechanical and electrical definitions for interchangeability |
| ±10% voltage tolerance (A suffix) | Enables cost-optimized design where tighter regulation is not required |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints during assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected workstations |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU with matte-tin plating and halogen-free epoxy |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Provides voltage reference for TL431-based optocoupler feedback in 24 V offline SMPS. IC Role / Device Role / Timing Role: Zener diode establishes precise 19 V clamp on secondary-side error amplifier input. Use Value: Maintains ±1% output regulation across line/load transients due to low ΔVZ (0.40 V) and stable ZZ (3.0 Ω). | Use Scenario: Supplies stable bias to bridge-based pressure transducer in factory automation PLC module. IC Role / Device Role / Timing Role: Acts as shunt reference for ratiometric ADC excitation, rejecting supply ripple. Use Value: Delivers <0.5% drift over –40 °C to +85 °C ambient, enabled by low thermal resistance (25 °C/W). |
| Overvoltage Protection Clamp | Programmable Threshold Detector |
Use Scenario: Clamps 24 V rail to safe level during load-dump events in automotive body control module. IC Role / Device Role / Timing Role: Shunt limiter activated above 19 V, diverting surge current away from downstream ICs. Use Value: Withstands 250 A 8.3 ms surges without degradation, verified per JEDEC test conditions. | Use Scenario: Sets trip threshold for comparator monitoring battery voltage in portable medical device. IC Role / Device Role / Timing Role: Defines 19 V upper limit for Li-ion pack overcharge detection. Use Value: Enables accurate 19 V ±1.9 V threshold with predictable knee behavior (IZK = 1 mA, ZZK = 22 Ω). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5356B/TR12 | ±5% tolerance (B suffix) vs. ±10% (A); same VZ, IZT, ZZ, IZM, package | Higher precision required in feedback paths where ±0.95 V error is unacceptable | Select B version when tighter regulation stability justifies cost premium |
| 1N5356C/TR12 | ±2% tolerance (C suffix); otherwise identical electrical specs and package | Used in metrology-grade references or calibration equipment demanding ±0.38 V accuracy | Choose C version only when system-level accuracy validation confirms benefit |
Compared with 1N5356A/TR12, the B and C variants offer progressively tighter voltage tolerances (±5%, ±2%) while retaining identical thermal, surge, and impedance performance-making them drop-in upgrades where precision outweighs cost sensitivity.
Availability
1N5356A/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and programmable threshold detectors requiring stable component supply and long-term obsolescence management.
Supply support for 1N5356A/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance for 1N5356A/TR12?
The "A" suffix in 1N5356A/TR12 specifies a ±10% Zener voltage tolerance, meaning the measured VZ at 65 mA will fall between 17.1 V and 20.9 V at 25 °C. This tolerance is confirmed in Microsemi's official datasheet revision D (2008) and applies across the full operating temperature range of –65 °C to +150 °C. The 1N5356A/TR12 is not rated for tighter tolerance grades unless re-screened.
Does 1N5356A/TR12 require dry packing before PCB assembly?
No, 1N5356A/TR12 does not require dry packing. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1, confirmed in the Microsemi datasheet. This means the device may be stored indefinitely at ambient conditions (<30 °C / 60% RH) without baking or humidity-controlled packaging, simplifying SMT and through-hole assembly logistics.
What is the maximum surge current rating for 1N5356A/TR12?
The 1N5356A/TR12 has a maximum non-repetitive surge current (IZSM) of 250 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is validated per JEDEC test method and enables reliable transient suppression in automotive load-dump or industrial inductive-switching scenarios without degradation when operated within specified thermal limits.
How is polarity marked on the 1N5356A/TR12 package?
The cathode of the 1N5356A/TR12 is marked by a distinct color band on the T-18 axial-leaded body. Per Microsemi documentation, the diode must be operated with the banded end positive relative to the unbanded (anode) end to achieve proper reverse-bias Zener conduction. Incorrect orientation results in forward conduction (~1.2 V drop) and loss of regulation.
Is 1N5356A/TR12 RoHS compliant?
Yes, 1N5356A/TR12 is RoHS compliant. The "e3" designation in Microsemi's part numbering system confirms compliance with EU Directive 2011/65/EU. Its matte-tin-plated leads and UL94V-0 epoxy body contain no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and solderability is verified per MIL-STD-750 Method 2026.
1N5356A/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):
- 19 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 3 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 13.7 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
1N5356A/TR12 FAQ
1.How can I place an order for 1N5356A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5356A/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 1N5356A/TR12 reliable?
The price and inventory of 1N5356A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5356A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5356A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5356A/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5356A/TR12?
1N5356A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5356A/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 1N5356A/TR12?
For technical support, including 1N5356A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5356A/TR12 requirements.
6.How does Aetrix verify that 1N5356A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5356A/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 1N5356A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5356A/TR12?
All 1N5356A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5356A/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 1N5356A/TR12 part is unused and in its original packaging.
Return procedure for 1N5356A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5356A/TR12 Tags
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