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Microchip Technology 1N5370AE3/TR8
- Part No.:
- 1N5370AE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370AE3/TR8.pdf
- Description:
- DIODE ZENER 56V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,446
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Product details
Overview
1N5370AE3/TR8 from Microsemi is a 56 V, ±10% 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 1N5370AE3/TR8 datasheet, 1N5370AE3/TR8 pinout, 1N5370AE3/TR8 application, or 1N5370AE3/TR8 equivalent, this page provides verified electrical parameters, thermal derating behavior, RoHS-compliant packaging details, and direct alternatives for industrial power management designs.
Technical Context
This Zener operates in reverse breakdown with cathode-banded polarity and requires no dry pack per IPC/JEDEC J-STD-020B Level 1 moisture sensitivity. Its 25 °C/W junction-to-lead thermal resistance enables 5 W steady-state dissipation at TL < 25°C with 3/8" lead length from body.
Regulation performance is defined by ΔVZ = 1.00 V (difference between voltage at 10% and 50% of IZM), ZZK = 44 Ω at 1.0 mA, and IR ≤ 0.5 μA at VR = 42.6 V - confirming tight low-current stability for reference use cases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±10% - nominal regulation point with guaranteed range 50.4–61.6 V at 20 mA |
| Test Current (IZT) | 20 mA - standardized bias condition for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 35 Ω - small-signal AC resistance affecting regulation accuracy under varying load |
| Max Reverse Current (IR) | ≤0.5 μA at VR = 42.6 V - ensures minimal leakage below regulation threshold |
| Power Dissipation (Pd) | 5.0 W at TL < 25°C - full rated power achievable with proper lead heat sinking |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - defines temperature rise per watt with 3/8" lead length |
| Surge Current (IZSM) | 280 A (8.3 ms half-sine) - peak non-repetitive capability for transient suppression |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free transfer-molded thermosetting epoxy, UL94V-0). Cathode indicated by colored band; device operated with banded end positive relative to unbanded end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to system ground or lower-potential rail in shunt regulator configuration |
| Cathode (banded end) | Regulated output node | Provides stable 56 V reference when reverse-biased; sinks current to maintain voltage |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant plating | Matte-tin termination per MIL-STD-750 Method 2026, compatible with lead-free reflow |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - no special handling required |
| Moisture sensitivity | Level 1 per J-STD-020B - shipped in standard packaging without dry pack |
| Surge withstand | 280 A peak (8.3 ms half-sine) - suitable for line-transient clamping in DC supplies |
| Voltage regulation stability | ΔVZ = 1.00 V - low variation between 10% and 50% of max current supports precision references |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Shunt reference providing precise 56 V threshold to control PWM duty cycle. Use Value: Maintains ±10% output accuracy across line/load/temperature with 35 Ω dynamic impedance limiting error contribution. |
Use Scenario: Clamps transient spikes on 48 V DC bus during inductive load switching. IC Role / Device Role / Timing Role: Voltage-limiting element absorbing surge energy before downstream components. Use Value: Withstands 280 A non-repetitive surges and holds clamp voltage within 56 V ±10%, protecting MOSFETs and controllers. |
| Precision Reference Generator | Industrial Sensor Excitation |
Use Scenario: Generates stable excitation voltage for bridge-based pressure transducers in harsh environments. IC Role / Device Role / Timing Role: Low-drift Zener reference source feeding instrumentation amplifier input stage. Use Value: Delivers 56 V with ≤0.5 μA leakage at 42.6 V and ΔVZ = 1.00 V, minimizing offset drift in ratiometric measurements. |
Use Scenario: Supplies regulated bias to high-impedance RTD or strain gauge interfaces in PLC analog input modules. IC Role / Device Role / Timing Role: Fixed-voltage shunt regulator establishing known excitation potential. Use Value: Operates reliably from -65°C to +150°C with 25 °C/W thermal resistance, enabling wide-temperature industrial deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5370B | ±5% tolerance (vs. ±10% for 1N5370AE3/TR8); identical VZ, IZT, ZZ, and package | Higher precision needed in feedback loops where tighter regulation reduces output variance | Select 1N5370B when ±5% VZ tolerance is required without changing layout or thermal design |
| MMBZ5255B (SOT-23) | Surface-mount, 0.5 W rating, 56 V ±5%, 100 Ω ZZ at 20 mA - not power-compatible | Limited to low-power signal-level referencing; unsuitable for 5 W dissipation or surge clamping | Choose MMBZ5255B only for space-constrained PCBs where power demand is < 0.5 W and thermal mass is insufficient for axial leads |
Compared with 1N5370B and MMBZ5255B, the 1N5370AE3/TR8 uniquely balances 5 W power handling, ±10% tolerance, RoHS compliance, and axial-leaded mechanical robustness - making it optimal for industrial power supply regulation where cost, reliability, and thermal margin outweigh ultra-tight tolerance needs.
Availability
1N5370AE3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and precision reference generators requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for 1N5370AE3/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 semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xx series was designed for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal resilience, surge immunity, and long-term parametric stability under extreme environmental stress.
FAQ
What is the Zener voltage tolerance of the 1N5370AE3/TR8?
1N5370AE3/TR8 has a ±10% Zener voltage tolerance, meaning its nominal 56 V regulation point falls within 50.4 V to 61.6 V at 20 mA test current. This tolerance is designated by the "A" suffix per Microsemi's documentation and applies across the full operating temperature range of -65°C to +150°C.
Does the 1N5370AE3/TR8 require dry pack packaging due to moisture sensitivity?
No, the 1N5370AE3/TR8 has IPC/JEDEC J-STD-020B Level 1 moisture sensitivity and is shipped without dry pack. Its void-free thermosetting epoxy body and matte-tin plating eliminate moisture absorption concerns, allowing standard handling and storage without baking or humidity-controlled environments.
What is the maximum surge current rating for the 1N5370AE3/TR8?
The 1N5370AE3/TR8 is rated for 280 A peak non-repetitive surge current (IZSM) using an 8.3 ms half-sine waveform. This specification enables reliable transient suppression in DC power rails, such as clamping inductive kickback in motor drive or relay control circuits.
How does thermal resistance affect the 1N5370AE3/TR8's power dissipation capability?
The 1N5370AE3/TR8 has a junction-to-lead thermal resistance of 25 °C/W. At 3/8" lead length from body, it sustains full 5 W dissipation only if lead temperature (TL) stays below 25°C. On FR4 board with 1 oz copper, its effective ambient-rated power drops to 1.47 W - requiring external heatsinking or lead trimming for higher loads.
Is the 1N5370AE3/TR8 compatible with lead-free soldering processes?
Yes, the 1N5370AE3/TR8 features RoHS-compliant matte-tin plating qualified per MIL-STD-750 Method 2026 and supports lead-free reflow up to 260°C for 10 seconds. Its UL94V-0 epoxy body remains stable under these conditions, ensuring mechanical integrity and solder joint reliability.
1N5370AE3/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:
- ±10%
- 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
1N5370AE3/TR8 FAQ
1.How can I place an order for 1N5370AE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370AE3/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 1N5370AE3/TR8 reliable?
The price and inventory of 1N5370AE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370AE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5370AE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370AE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370AE3/TR8?
1N5370AE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370AE3/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 1N5370AE3/TR8?
For technical support, including 1N5370AE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370AE3/TR8 requirements.
6.How does Aetrix verify that 1N5370AE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5370AE3/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 1N5370AE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5370AE3/TR8?
All 1N5370AE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370AE3/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 1N5370AE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5370AE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5370AE3/TR8 Tags
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