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Microchip Technology 1N5356B/TR12
- Part No.:
- 1N5356B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5356B/TR12.pdf
- Description:
- DIODE ZENER 19V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,876
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Product details
Overview
1N5356B/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 19 V ±5%, 3.0 Ω maximum dynamic impedance at 65 mA test current, 0.5 μA maximum reverse leakage at 14.4 V, and 75 mA maximum Zener current 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 1N5356B/TR12 datasheet, 1N5356B/TR12 pinout, 1N5356B/TR12 application, or 1N5356B/TR12 equivalent, key selection criteria include its ±5% tolerance, low 3.0 Ω Zener impedance, 25 °C/W junction-to-lead thermal resistance, and RoHS-compliant matte-tin plating - all critical for stable regulation under varying load and temperature conditions.
Technical Context
This device operates as a shunt voltage regulator by maintaining a stable reverse-biased breakdown voltage across its terminals. Its 19 V nominal Zener voltage is specified at 65 mA (IZT), with voltage regulation (ΔVZ) of 0.40 V measured between 10% and 50% of IZM - indicating tight control over output variation across operating current range.
The 1N5356B/TR12 features a T-18 axial package with cathode band marking, moisture sensitivity level 1 (no dry pack required), and UL94V-0 epoxy encapsulation. Thermal performance is defined for 3/8″ (10 mm) lead length from body (25 °C/W) or FR4 PCB mounting (85 °C/W), enabling accurate derating in real-world layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19 V ±5% at 65 mA - defines precise regulation point for feedback or clamping |
| Power Dissipation | 5.0 W at TL = 25°C - requires thermal management above ambient or lead-length constraints |
| Dynamic Impedance (ZZ) | 3.0 Ω max at IZT = 65 mA - ensures minimal output voltage shift under load transients |
| Reverse Leakage (IR) | 0.5 μA max at VR = 14.4 V - guarantees low standby power loss in high-impedance bias networks |
| Max Zener Current (IZM) | 75 mA - sets absolute DC current limit before thermal runaway without heatsinking |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables direct calculation of junction temperature rise |
| Forward Voltage | 1.2 V max at IF = 1.0 A - relevant for polarity-check or ESD-protection forward conduction paths |
Pinout & Package
Package: T-18 axial-leaded plastic case per JEDEC TO-204AA; cathode indicated by color 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 | Positive terminal in forward bias; connected to ground or lower-potential node in shunt regulation | Provides low-voltage drop path during fault or startup; must handle 1.0 A surge if used in crowbar designs |
| Cathode | Negative terminal in forward bias; connected to regulated rail or voltage source in shunt configuration | Carries full Zener current; marked by band; requires thermal relief on PCB for 5 W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Reduces need for post-production trimming in mid-precision voltage references |
| 25 °C/W junction-to-lead thermal resistance | Enables reliable 5 W operation with simple lead-length-based heatsinking - no PCB copper pour required |
| 0.5 μA max reverse leakage at 14.4 V | Minimizes error in high-gain op-amp reference buffers or low-power sensor biasing |
| RoHS-compliant e3 variant | Meets environmental compliance without sacrificing electrical or thermal performance |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during manual assembly or rework |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing stable 19 V reference to TL431 or similar error amplifier. Use Value: Maintains ±1% output accuracy over line/load/temperature with <0.4 V regulation delta across 7.5–37.5 mA operating range. | Use Scenario: Clamps transient surges on 15 V logic rails caused by inductive switching or ESD events. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting excess energy to ground before downstream IC damage. Use Value: Withstands 8.3 ms half-sine surge up to 75 A peak (IZSM) while holding clamp voltage ≤20.1 V. |
| Programmable Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Generates stable excitation voltage for resistive bridge sensors in 4–20 mA transmitter modules. IC Role / Device Role / Timing Role: Precision Zener reference feeding DAC output buffer or instrumentation amplifier gain stage. Use Value: Delivers 19 V ±5% with <3 Ω dynamic impedance, minimizing gain drift due to supply variation. | Use Scenario: Supplies constant bias voltage to RTD or strain gauge bridges in harsh-temperature industrial environments. IC Role / Device Role / Timing Role: Temperature-stable shunt regulator compensating for ambient drift in analog front-end circuits. Use Value: Operates from –65°C to +150°C with <0.4 V ΔVZ, ensuring bridge excitation stability across full industrial range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5356B (bulk) | Identical electrical specs; differs only in packaging - bulk vs. tape-and-reel (TR12) | No functional difference; TR12 enables automated pick-and-place; bulk suits hand-solder prototyping | Select 1N5356B/TR12 for SMT production; choose bulk for lab validation or low-volume builds |
| MMSZ5247B-TP (Micro Commercial) | Surface-mount SOD-123; 19 V ±5%; 500 mW rating; 30 Ω Zz - lower power, higher impedance | Not suitable for 5 W continuous dissipation; limited to low-current bias/reference roles | Use MMSZ5247B-TP only where board space is constrained and power <0.5 W; retain 1N5356B/TR12 for >1 W regulation |
Compared with 1N5356B (bulk) and MMSZ5247B-TP, the 1N5356B/TR12 uniquely combines tape-and-reel automation readiness, 5 W power handling, and axial through-hole mechanical robustness - making it optimal for industrial power supplies requiring field-replaceable, thermally managed regulation.
Availability
1N5356B/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and industrial sensor excitation systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 1N5356B/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 timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series belongs to Microsemi's legacy high-power Zener diode product line, engineered for ruggedized voltage regulation in mission-critical power systems where thermal stability and long-term parametric consistency are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5356B/TR12?
The 1N5356B/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its nominal 19 V regulation voltage falls within 18.05 V to 19.95 V at 65 mA test current and 25°C lead temperature. The tolerance is guaranteed across the full operating temperature range of –65°C to +150°C, and applies to every unit shipped in the 1N5356B/TR12 reel.
Can the 1N5356B/TR12 be used without a heatsink?
Yes, the 1N5356B/TR12 can operate at full 5 W dissipation without an external heatsink - but only when mounted with 3/8″ (10 mm) lead length from the body, per its 25 °C/W junction-to-lead thermal resistance specification. On a standard FR4 PCB with 1 oz copper, its steady-state power drops to 1.47 W at 25°C ambient; exceeding this requires either shorter leads, added copper area, or forced airflow to avoid exceeding 150°C junction temperature.
What does the "TR12" suffix mean in 1N5356B/TR12?
The "TR12" suffix in 1N5356B/TR12 indicates tape-and-reel packaging per EIA-296 standard, with 12 mm tape width and 1,000 units per reel. This format supports automated SMT placement equipment and ensures consistent orientation (cathode band facing same direction) for high-yield assembly. The underlying electrical and thermal specifications of the 1N5356B/TR12 are identical to the bulk-packaged 1N5356B.
Is the 1N5356B/TR12 RoHS compliant?
Yes, the 1N5356B/TR12 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation. Its leads use annealed matte-tin plating instead of tin-lead, meeting EU Directive 2011/65/EU requirements. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is rated for solder reflow up to 260°C for 10 seconds.
How does the 1N5356B/TR12 compare to the 1N4746A in terms of regulation performance?
The 1N5356B/TR12 offers superior regulation performance versus the 1N4746A: it delivers 19 V ±5% vs. 18 V ±5%, lower dynamic impedance (3.0 Ω vs. 10 Ω), higher max Zener current (75 mA vs. 53 mA), and better thermal resistance (25 °C/W vs. 50 °C/W). These differences make the 1N5356B/TR12 more stable under dynamic loads and better suited for 5 W continuous operation - whereas the 1N4746A is rated for only 1 W and exhibits larger voltage shift with current variation.
1N5356B/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:
- ±5%
- 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
1N5356B/TR12 FAQ
1.How can I place an order for 1N5356B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5356B/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 1N5356B/TR12 reliable?
The price and inventory of 1N5356B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5356B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5356B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5356B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5356B/TR12?
1N5356B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5356B/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 1N5356B/TR12?
For technical support, including 1N5356B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5356B/TR12 requirements.
6.How does Aetrix verify that 1N5356B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5356B/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 1N5356B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5356B/TR12?
All 1N5356B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5356B/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 1N5356B/TR12 part is unused and in its original packaging.
Return procedure for 1N5356B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5356B/TR12 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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