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Microchip Technology 1N5370B/TR12
- Part No.:
- 1N5370B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370B/TR12.pdf
- Description:
- DIODE ZENER 56V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,762
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Product details
Overview
1N5370B/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 56 V, ±5% tolerance (B suffix), 20 mA test current, 35 Ω dynamic impedance at IZT, and maximum reverse current of 0.5 μA at 42.6 V. 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 1N5370B/TR12 datasheet, 1N5370B/TR12 pinout, 1N5370B/TR12 application, or 1N5370B/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (280 A), voltage regulation (ΔVZ = 2.3 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown, where stable Zener voltage is maintained across a wide range of currents (1–50 mA) and temperatures. Its low dynamic impedance (35 Ω) and tight voltage regulation (2.3 V ΔVZ) ensure minimal output variation under load transients.
The 1N5370B/TR12 uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 5 W steady-state dissipation at 25°C lead temperature and 1.47 W on FR4 board. It meets MIL-PRF-19500 screening options when prefixed with MQ/MX/MV and is moisture-sensitive Level 1 per J-STD-020B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% - defines precise regulation point for feedback networks and reference circuits |
| Test Current (IZT) | 20 mA - standard bias point for measuring VZ and ZZ, ensuring repeatable characterization |
| Dynamic Impedance (ZZ) | 35 Ω max at IZT - determines output voltage stability under varying load current |
| Max Reverse Current (IR) | 0.5 μA at 42.6 V - confirms sharp knee and low leakage below regulation threshold |
| Max Regulator Current (IZM) | 280 mA - peak DC current capability with adequate heat sinking at TL = 25°C |
| Surge Current (IZSM) | 280 A (8.3 ms half-sine) - supports transient overvoltage clamping without failure |
| Voltage Regulation (ΔVZ) | 2.3 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free thermosetting epoxy, UL94V-0 rated), cathode indicated by color band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail; forms return path for Zener current |
| Cathode | Regulated output node | Banded end; supplies stable 56 V reference when reverse-biased; connects to feedback divider or clamp point |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized electrical behavior and interchangeability across qualified suppliers |
| ±5% voltage tolerance (B suffix) | Enables tighter feedback loop control than ±10% (A) or ±20% (no suffix) variants |
| 25 °C/W junction-to-lead thermal resistance | Supports 5 W continuous operation with simple 3/8″ lead heatsinking-no PCB copper pour required |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during assembly and reduces field failure risk |
| RoHS-compliant (e3 suffix) | Meets global environmental compliance without performance trade-offs or derating |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback network of an isolated 48 V telecom DC-DC converter to regulate output within ±1%. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold; replaces precision shunt regulator IC in cost-sensitive designs. Use Value: Delivers 56 V reference with 2.3 V regulation spread across 28–140 mA, enabling stable loop gain without trimming. | Use Scenario: Placed across a 42 V battery input rail to protect downstream DC-DC converters from load-dump surges up to 80 V. IC Role / Device Role / Timing Role: Passive overvoltage clamp; conducts only above 56 V, diverting surge energy to ground via series resistor. Use Value: Withstands 280 A 8.3 ms surge and maintains <0.5 μA leakage at 42.6 V, minimizing standby loss. |
| Industrial Sensor Excitation Reference | Programmable Logic Controller (PLC) Input Conditioning |
Use Scenario: Provides stable excitation voltage for a 4–20 mA pressure transducer in a factory automation module operating at 70°C ambient. IC Role / Device Role / Timing Role: Precision voltage source for bridge sensor bias; referenced against 2.5 V ADC reference. Use Value: Maintains 56 V ±5% across –65°C to +150°C and 1–50 mA load, reducing calibration drift vs. resistor-divider alone. | Use Scenario: Mounted on PLC backplane to clamp induced transients on 24 V digital input channels exposed to relay coil switching noise. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting Schmitt-trigger inputs and isolation barriers. Use Value: Low 35 Ω ZZ ensures fast response to <100 ns spikes; 25 °C/W thermal resistance prevents thermal runaway during repeated events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5370B (bulk) | Identical electrical specs and package; differs only in packaging (ammo pack vs. tape-and-reel TR12) | No functional difference; TR12 enables automated SMT placement while bulk supports manual/hand-soldered assembly | Select 1N5370B/TR12 for pick-and-place production; choose bulk for prototyping or low-volume repair |
| MMBZ5255B (SOT-23) | Same 56 V ±5%, but 0.35 W rating, 100 Ω ZZ, and surface-mount package | Not suitable for 5 W power dissipation; limited to low-current references (<20 mA) in space-constrained PCBs | Use MMBZ5255B only where board area is critical and power is <0.35 W; retain 1N5370B/TR12 for high-power regulation |
Compared with 1N5370B (bulk) and MMBZ5255B, the 1N5370B/TR12 uniquely combines JEDEC-standardized 5 W axial power handling, 25 °C/W thermal resistance, and tape-and-reel compatibility-enabling both robust thermal performance and automated manufacturing without redesign.
Availability
1N5370B/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller (PLC) modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5370B/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 was designed as a JEDEC-standardized, high-power axial Zener platform for voltage regulation and transient suppression in harsh-environment power systems where thermal robustness and long-term stability are critical.
FAQ
What is the Zener voltage tolerance for 1N5370B/TR12?
The 1N5370B/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This means its regulated voltage falls between 53.2 V and 58.8 V at 20 mA test current and 25°C lead temperature. The tolerance is guaranteed across the full operating temperature range (–65°C to +150°C), and the 1N5370B/TR12 is not rated for tighter tolerances such as ±2% (C) or ±1% (D).
Does 1N5370B/TR12 require dry packing per J-STD-020B?
No, the 1N5370B/TR12 does not require dry packing because it carries moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B. This classification applies due to its void-free thermosetting epoxy T-18 package, which inherently resists moisture absorption. As confirmed in the Microsemi datasheet, no baking or dry pack is needed prior to soldering-even for reflow processes up to 260°C for 10 seconds.
What is the maximum steady-state power dissipation for 1N5370B/TR12 on a standard FR4 PCB?
The 1N5370B/TR12 delivers 1.47 W steady-state power dissipation when mounted on a standard FR4 PCB (1 oz Cu) with 4 mm² copper pads and 1 mm track width over 25 mm length. This value derives from its 85 °C/W junction-to-ambient thermal resistance under those specific board conditions. At higher ambient temperatures, power must be derated per Figure 1 in the Microsemi datasheet-e.g., to ~1.0 W at 70°C ambient.
Can 1N5370B/TR12 be used as a direct replacement for 1N5370B in existing designs?
Yes, the 1N5370B/TR12 is electrically and mechanically identical to the bulk 1N5370B, differing only in packaging format (tape-and-reel TR12 vs. bulk). All electrical parameters-including 56 V Zener voltage, ±5% tolerance, 35 Ω dynamic impedance, and 280 mA IZM-are unchanged. No PCB layout or schematic modification is required when substituting 1N5370B/TR12 into designs originally specified for 1N5370B.
What is the surge current rating for 1N5370B/TR12 and how is it defined?
The 1N5370B/TR12 has a maximum non-recurrent surge current (IZSM) rating of 280 A, defined as the peak amplitude of a single 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy without failure-critical for overvoltage clamp applications. The surge test condition assumes proper series current limiting and is validated per Microsemi's test methodology, not extrapolated from DC ratings.
1N5370B/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):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 40.3 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
1N5370B/TR12 FAQ
1.How can I place an order for 1N5370B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370B/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 1N5370B/TR12 reliable?
The price and inventory of 1N5370B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5370B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370B/TR12?
1N5370B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370B/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 1N5370B/TR12?
For technical support, including 1N5370B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370B/TR12 requirements.
6.How does Aetrix verify that 1N5370B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5370B/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 1N5370B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5370B/TR12?
All 1N5370B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370B/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 1N5370B/TR12 part is unused and in its original packaging.
Return procedure for 1N5370B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5370B/TR12 Tags
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MM5Z5V1ST1G
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