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Microchip Technology 1N5370BE3/TR8
- Part No.:
- 1N5370BE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370BE3/TR8.pdf
- Description:
- DIODE ZENER 56V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,701
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Product details
Overview
1N5370BE3/TR8 from Microsemi is a 56 V, ±5% tolerance, 5 W axial-leaded silicon Zener diode optimized for voltage regulation in power supply feedback loops, overvoltage protection circuits, and precision reference applications. It delivers 20 mA test current, 35 Ω dynamic impedance at 20 mA, and maintains stable regulation across -65°C to +150°C operating temperature.
For engineers reviewing the 1N5370BE3/TR8 datasheet, 1N5370BE3/TR8 pinout, 1N5370BE3/TR8 application, or 1N5370BE3/TR8 equivalent, key selection criteria include Zener voltage accuracy, surge current capability (280 A), thermal resistance (25 °C/W junction-to-lead), and RoHS-compliant matte-tin plating for reliable solderability.
Technical Context
This device operates as a reverse-biased voltage reference with a nominal Zener voltage of 56 V at 20 mA test current. Its 35 Ω dynamic impedance ensures minimal voltage variation under load changes, and its 280 A peak surge rating supports transient suppression in industrial power rails.
The 1N5370BE3/TR8 uses a void-free thermosetting epoxy T-18 package with cathode band polarity marking and is rated for 5 W steady-state dissipation at 25°C lead temperature. Thermal resistance is specified as 25 °C/W junction-to-lead (3/8" lead length) and 85 °C/W junction-to-ambient on FR4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% at 20 mA - defines precise regulation point for feedback and clamping circuits |
| Power Dissipation (PD) | 5.0 W at TL = 25°C - requires adequate heat sinking for continuous operation above ~1.5 W on PCB |
| Dynamic Impedance (ZZ) | 35 Ω max at IZT = 20 mA - low impedance enables tight voltage regulation under varying load currents |
| Maximum Surge Current (IZSM) | 280 A (8.3 ms half-sine) - supports robust transient voltage suppression without failure |
| Reverse Leakage (IR) | 0.5 μA max at 42.6 V - ensures minimal standby power loss in high-impedance bias networks |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables thermal design using lead conduction path for heatsinking |
| Operating Temperature | -65°C to +150°C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case per JEDEC DO-201AD standard; void-free UL94V-0 epoxy body; cathode indicated by colored band; leads plated with RoHS-compliant annealed matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common or lower-potential rail; forms return path for Zener current |
| Cathode | Regulated output node | Banded end; connected to regulated voltage point; reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions and electrical behavior across global supply chain |
| ±5% voltage tolerance (B suffix) | Reduces need for post-manufacturing calibration in mid-precision reference designs |
| RoHS-compliant e3 suffix | Meets EU Directive 2011/65/EU without lead or hazardous substance exemptions |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints for SMT assembly planning |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special static-control protocols in production environments |
Applications
| Switch-Mode Power Supply Feedback | Industrial Overvoltage Clamp |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated 48 V DC-DC converter to regulate output within ±1.5%. IC Role / Device Role / Timing Role: Precision voltage reference establishing error threshold for TL431-like comparator function. Use Value: 56 V Zener voltage matches secondary-side sensing range; 35 Ω ZZ minimizes regulation error across 10–100 mA load steps. | Use Scenario: Placed across motor drive bus to clamp transients exceeding 60 V during inductive kickback events. IC Role / Device Role / Timing Role: Passive overvoltage protection element absorbing energy during 280 A surge pulses. Use Value: 280 A surge rating exceeds IEC 61000-4-5 Level 4 requirements; 5 W power rating sustains repeated clamping without thermal runaway. |
| Programmable Voltage Reference | Automotive Battery Monitoring |
Use Scenario: Paired with resistor divider to generate stable 5.0 V reference for ADC input scaling in data acquisition module. IC Role / Device Role / Timing Role: Primary voltage reference source with temperature coefficient compensated via external network. Use Value: ±5% initial tolerance and -65°C to +150°C operation enable calibration-free use in wide-temperature embedded systems. | Use Scenario: Monitors 48 V battery stack in commercial vehicle telematics unit, triggering fault flag when voltage exceeds 58.8 V. IC Role / Device Role / Timing Role: Analog threshold detector providing fail-safe overvoltage indication independent of microcontroller. Use Value: 0.5 μA leakage at 42.6 V ensures negligible current draw on battery; cathode-band polarity prevents misconnection in field service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5370BRLG | Same 56 V ±5%, 5 W rating; surface-mount SMB package instead of axial T-18 | Requires PCB re-layout for SMD footprint; eliminates manual through-hole insertion | Select for automated assembly or space-constrained designs where leaded mounting is impractical |
| MMBZ5255BLT1G | 56 V ±5%, but only 0.35 W power rating and 100 mA max IZM | Not suitable for >350 mW continuous dissipation or surge suppression | Select only for low-power biasing or signal-level clamping where thermal mass is not required |
Compared with 1N5370BRLG and MMBZ5255BLT1G, the 1N5370BE3/TR8 provides superior thermal performance (25 °C/W vs. >200 °C/W), higher surge immunity (280 A vs. <10 A), and proven reliability in high-stress industrial power systems.
Availability
1N5370BE3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial overvoltage clamps, and programmable voltage references requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for 1N5370BE3/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 1N53xxB series was designed specifically for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and long-term parametric stability.
FAQ
What is the Zener voltage tolerance of the 1N5370BE3/TR8?
The 1N5370BE3/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its nominal 56 V Zener voltage is guaranteed between 53.2 V and 58.8 V at 20 mA test current and 25°C lead temperature. The tolerance remains valid across the full -65°C to +150°C operating range per Microsemi's characterization data.
Does the 1N5370BE3/TR8 require dry packing before PCB assembly?
No, the 1N5370BE3/TR8 does not require dry packing. It carries IPC/JEDEC J-STD-020B moisture sensitivity level 1 classification, meaning it may be stored indefinitely at ambient conditions without desiccant or humidity-controlled packaging. This simplifies inventory handling and eliminates floor-life tracking during SMT or through-hole assembly.
What is the maximum surge current rating for the 1N5370BE3/TR8?
The 1N5370BE3/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 280 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is validated per Microsemi's test methodology and supports use in transient voltage suppression applications such as motor drive bus clamping and lightning-induced surge protection in industrial controls.
How is polarity marked on the 1N5370BE3/TR8?
The 1N5370BE3/TR8 uses a cathode band marking - a single colored band near one end of the cylindrical T-18 package. During operation, the banded end must be held at a more positive potential than the opposite (anode) end to maintain reverse-bias conduction. This marking is consistent across all 1N53xxB devices and aligns with JEDEC DO-201AD mechanical standards.
What is the thermal resistance specification for the 1N5370BE3/TR8?
The 1N5370BE3/TR8 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W when measured at 3/8" (10 mm) lead length from the body. When mounted on a standard FR4 PCB with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm traces, its junction-to-ambient resistance rises to 85 °C/W - a critical parameter for derating calculations in enclosed or high-ambient-temperature environments.
1N5370BE3/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):
- 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
1N5370BE3/TR8 FAQ
1.How can I place an order for 1N5370BE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370BE3/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 1N5370BE3/TR8 reliable?
The price and inventory of 1N5370BE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370BE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5370BE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370BE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370BE3/TR8?
1N5370BE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370BE3/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 1N5370BE3/TR8?
For technical support, including 1N5370BE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370BE3/TR8 requirements.
6.How does Aetrix verify that 1N5370BE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5370BE3/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 1N5370BE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5370BE3/TR8?
All 1N5370BE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370BE3/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 1N5370BE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5370BE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5370BE3/TR8 Tags
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