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Microchip Technology 1N5370CE3/TR8
- Part No.:
- 1N5370CE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370CE3/TR8.pdf
- Description:
- DIODE ZENER 56V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,331
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Product details
Overview
1N5370CE3/TR8 from Microsemi is a 56 V, ±2% tolerance, 5 W axial-leaded silicon Zener diode optimized for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation. It delivers stable regulation at 20 mA test current with 35 Ω dynamic impedance and supports surge currents up to 280 A (8.3 ms half-sine).
For engineers reviewing the 1N5370CE3/TR8 datasheet, 1N5370CE3/TR8 pinout, 1N5370CE3/TR8 application, or 1N5370CE3/TR8 equivalent, key selection criteria include its ±2% VZ tolerance (C suffix), RoHS-compliant matte-tin plating, Level 1 moisture sensitivity, and 25 °C/W junction-to-lead thermal resistance with 10 mm lead length.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown when cathode voltage exceeds anode by ≥56 V. Its regulation performance is specified at 25 °C with 20 mA test current (IZT) and validated across -65 °C to +150 °C operating temperature range.
It exhibits 35 Ω maximum dynamic impedance (ZZ) at IZT, 0.5 μA maximum reverse leakage at 42.6 V (VR), and 2.3 V maximum voltage regulation (ΔVZ) between 10% and 50% of IZM. Thermal design requires attention to lead-length-dependent derating per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±2% - precise reference for feedback networks requiring tight tolerance |
| Test Current (IZT) | 20 mA - standard bias point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 35 Ω max - low AC resistance ensures minimal output voltage variation under load transients |
| Max Reverse Leakage (IR) | 0.5 μA at 42.6 V - enables low-power standby operation without significant quiescent loss |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - dictates minimum lead length (10 mm) for full 5 W dissipation at 25 °C |
| Surge Current (IZSM) | 280 A (8.3 ms half-sine) - supports transient overvoltage clamping in industrial power systems |
| Operating Temperature | -65 °C to +150 °C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
Package: T-18 axial-leaded plastic case (Void-free UL94V-0 epoxy), cathode indicated by band, RoHS-compliant matte-tin plated leads, 0.7 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to system ground or common return; defines zero-reference potential for regulation |
| Cathode (banded end) | Regulated output node | Provides stable 56 V reference when reverse-biased; must be held >56 V above anode |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables high-accuracy feedback without external trimming in DC-DC converter error amplifiers |
| RoHS-compliant e3 marking | Meets global environmental compliance requirements for industrial and medical equipment |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints during SMT assembly prep |
| 25 °C/W junction-to-lead thermal resistance | Supports full 5 W power dissipation with only 3/8″ (10 mm) lead length from body |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-safe workstations in production |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision voltage reference for TL431-like shunt regulator circuits. Use Value: ±2% VZ tolerance ensures output accuracy within ±1.5% over line/load/temperature without calibration. |
Use Scenario: Clamping transient surges on 48 V telecom distribution rails during lightning-induced spikes. IC Role / Device Role / Timing Role: Fast-acting crowbar element absorbing energy before downstream ICs fail. Use Value: 280 A surge rating (8.3 ms) handles IEC 61000-4-5 Level 4 surges without degradation. |
| Industrial Sensor Reference | Programmable Logic Controller Input Conditioning |
Use Scenario: Providing stable excitation voltage for 4–20 mA current-loop pressure transducers. IC Role / Device Role / Timing Role: Low-drift analog reference source for ratiometric sensor signal conditioning. Use Value: <0.5 μA leakage at 42.6 V minimizes error in high-impedance bridge interfaces. |
Use Scenario: Level-shifting and clamping 24 V digital inputs to protect FPGA I/O banks. IC Role / Device Role / Timing Role: Input voltage limiter preventing damage from field-wiring faults. Use Value: 56 V breakdown with 2.3 V regulation spread ensures clean logic threshold margin under EMI stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5370B | ±5% VZ tolerance, same package and thermal specs | Lower cost where ±5% output accuracy is acceptable (e.g., non-critical biasing) | Select 1N5370B if system-level calibration compensates for wider tolerance |
| MMBZ5256BS | SOT-23 surface-mount, 56 V ±5%, 250 mW PD, 100 Ω ZZ | Space-constrained PCBs requiring automated placement; not suitable for 5 W dissipation | Choose MMBZ5256BS only for low-power signal-level referencing, not power-stage regulation |
Compared with 1N5370B and MMBZ5256BS, the 1N5370CE3/TR8 uniquely combines ±2% tolerance, 5 W power handling, and axial-leaded through-hole mounting-making it optimal for high-reliability, medium-power industrial power supplies where precision and thermal robustness are co-required.
Availability
1N5370CE3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor reference designs requiring stable component supply and long-term obsolescence management.
Supply support for 1N5370CE3/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 1N53xx series was designed specifically for ruggedized, high-stability voltage regulation in harsh-environment power systems-emphasizing wide temperature operation, surge resilience, and consistent parametric performance across screening levels.
FAQ
What is the Zener voltage tolerance of the 1N5370CE3/TR8?
The 1N5370CE3/TR8 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in its part number. This means its nominal 56 V breakdown voltage is guaranteed between 54.88 V and 57.12 V at 20 mA test current and 25 °C. This tighter tolerance supports applications demanding higher output accuracy without post-production calibration, such as regulated DC-DC converter feedback paths.
Does the 1N5370CE3/TR8 require dry packing due to moisture sensitivity?
No, the 1N5370CE3/TR8 has IPC/JEDEC J-STD-020B Level 1 moisture sensitivity, meaning it does not require dry packing or floor-life controls before soldering. Its void-free thermosetting epoxy package inherently resists moisture absorption, simplifying handling and storage in standard factory environments without desiccant or baking steps.
What is the maximum steady-state power dissipation for the 1N5370CE3/TR8 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5370CE3/TR8 has a steady-state power dissipation limit of 1.47 W at 25 °C ambient. This is derived from its 85 °C/W junction-to-ambient thermal resistance. For full 5 W operation, the device must be used with leads trimmed to 10 mm and heat sinking applied directly to the leads.
How does the 1N5370CE3/TR8 compare to the 1N5370B in terms of voltage regulation performance?
The 1N5370CE3/TR8 offers ±2% Zener voltage tolerance versus ±5% for the 1N5370B, while sharing identical dynamic impedance (35 Ω), surge rating (280 A), and thermal characteristics. The tighter tolerance directly improves output voltage accuracy in closed-loop power supplies, reducing system-level calibration burden and improving consistency across production batches.
Can the 1N5370CE3/TR8 be used in automotive under-hood applications?
Yes, the 1N5370CE3/TR8 is rated for -65 °C to +150 °C operating temperature and features nonsensitive ESD behavior per MIL-STD-750 Method 1020-making it suitable for under-hood automotive applications such as engine control unit (ECU) power rail monitoring and battery management system (BMS) voltage references where thermal and electrical robustness are critical.
1N5370CE3/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:
- ±2%
- 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
1N5370CE3/TR8 FAQ
1.How can I place an order for 1N5370CE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370CE3/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 1N5370CE3/TR8 reliable?
The price and inventory of 1N5370CE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370CE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5370CE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370CE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370CE3/TR8?
1N5370CE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370CE3/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 1N5370CE3/TR8?
For technical support, including 1N5370CE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370CE3/TR8 requirements.
6.How does Aetrix verify that 1N5370CE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5370CE3/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 1N5370CE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5370CE3/TR8?
All 1N5370CE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370CE3/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 1N5370CE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5370CE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5370CE3/TR8 Tags
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