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onsemi 1N5370BG
- Part No.:
- 1N5370BG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5370BG.pdf
- Description:
- DIODE ZENER 56V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:532
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Product details
Overview
1N5370BG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 56 V, ±5% tolerance, 20 Ω maximum zener impedance at 35 mA test current, and 1.0 μA maximum leakage current at 42.6 V reverse voltage. It operates across −65 °C to +200 °C and delivers stable voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N5370BG datasheet, pinout, applications, or equivalent options, this device is selected for precision DC voltage clamping, low-drift reference generation, and transient-suppressed regulator feedback paths where thermal stability and surge resilience are critical.
Technical Context
The 1N5370BG uses silicon-oxide passivated junction technology to achieve tight voltage tolerance (±5%), low dynamic impedance, and high ESD robustness (Class 3, >16 kV HBM). Its thermal design supports 5 W steady-state dissipation at 25 °C lead temperature with 25 °C/W junction-to-lead thermal resistance.
It exhibits a positive temperature coefficient above 5 V (≈+0.08 %/°C typical at 56 V), enabling predictable drift compensation in series-connected references. Surge capability reaches 280 A peak non-repetitive current at 8.3 ms pulse width per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 53.2–58.8 V (nominal 56 V at IZT = 35 mA; enables precise 56 V rail clamping) |
| Power Dissipation (PD) | 5 W @ TL = 25 °C (supports continuous regulation in compact PCB layouts with 3/8″ lead length) |
| Zener Impedance (ZZT) | 20 Ω max @ IZT = 35 mA (ensures minimal output voltage variation under load transients) |
| Leakage Current (IR) | 1.0 μA max @ VR = 42.6 V (guarantees low standby power loss in high-impedance bias networks) |
| Surge Current (IRM) | 280 A peak @ 8.3 ms (withstands lightning-induced surges in industrial power inputs) |
| Operating Temperature | −65 °C to +200 °C (suitable for under-hood automotive and downhole oilfield electronics) |
| ESD Rating | Class 3 (>16 kV HBM) (survives handling without external protection circuitry) |
Pinout & Package
Package: Axial-lead, transfer-molded plastic (Case 017AA), cathode indicated by band. Dimensions: 8.38–8.89 mm body length × 3.30–3.68 mm diameter; leads 25.4–31.75 mm long.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; defines polarity for reverse-bias operation |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 56 V reference when reverse-biased; marked with band for orientation |
Key Features
| Feature | Design Value |
|---|---|
| Surge-rated construction | 180 W surge rating at 8.3 ms enables use in unfiltered AC line interfaces without external MOVs |
| Pb-free compliant packaging | G-suffix confirms RoHS-compliant, void-free thermosetting plastic case for reliable reflow and wave soldering |
| Tight parameter control | Guaranteed limits on six electrical parameters (VZ, ZZT, IR, IZK, ZZK, IZM) reduce binning and calibration effort |
| High-temperature capability | 200 °C max storage and pulsed operation allows deployment in engine-control modules and power converters |
Applications
| Industrial Power Supply Reference | Automotive Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback DC-DC converters for PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode provides fixed 56 V reference to optocoupler input, setting primary-side regulation threshold. Use Value: Low 20 Ω impedance ensures <±0.5 V output deviation across 10–100 mA load steps, maintaining tight output regulation. |
Use Scenario: Protecting 48 V battery management system (BMS) analog front-end inputs from load-dump transients. IC Role / Device Role / Timing Role: Clamps induced spikes above 56 V to prevent ADC saturation and op-amp damage. Use Value: 280 A surge rating absorbs ISO 7637-2 Pulse 5a energy without degradation, eliminating need for parallel TVS devices. |
| Test Equipment Voltage Standard | Telecom Line Interface Protection |
Use Scenario: Serving as traceable 56 V calibration reference in portable multimeter internal shunt regulators. IC Role / Device Role / Timing Role: Provides metrology-grade voltage reference with <0.1 %/°C TC drift in temperature-controlled enclosures. Use Value: ±5 % initial tolerance and <1 μA leakage enable sub-0.5 % absolute accuracy after single-point factory trim. |
Use Scenario: Limiting ring voltage excursions on POTS line cards during lightning-induced surges. IC Role / Device Role / Timing Role: Acts as secondary clamp after gas discharge tube, absorbing residual energy above 42.6 V. Use Value: 25 °C/W θJL allows direct mounting to chassis ground plane, achieving <10 °C junction rise at full 5 W dissipation. |
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 | Same electrical specs but SnPb lead finish (non-RoHS); identical package and marking except absence of "G" suffix | Not suitable for lead-free manufacturing; requires separate Pb-containing assembly line | Select only if legacy process compatibility outweighs environmental compliance requirements |
| BZX85C56 | 4 W rating, 50 Ω ZZT max @ 35 mA, 100 °C max TJ, DO-41 package | Lower power and thermal capability; unsuitable for sustained 56 V/90 mA regulation | Acceptable only in low-duty-cycle clamping where average power <1.5 W |
Compared with 1N5370B, the 1N5370BG offers identical regulation performance with Pb-free compliance; versus BZX85C56, it delivers 25 % higher power handling and half the dynamic impedance-critical for high-accuracy, high-reliability 56 V reference designs.
Availability
1N5370BG is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronics, telecom infrastructure, and test equipment requiring stable component supply with full RoHS compliance and extended temperature support.
Supply support for 1N5370BG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1N53 Series belongs to onsemi's Surmetic™ 40 Zener regulator family, engineered for high-reliability voltage reference and clamping in harsh environments where thermal stability, surge immunity, and long-term parametric consistency are essential.
FAQ
What is the exact zener voltage tolerance and test condition for 1N5370BG?
The 1N5370BG has a ±5% zener voltage tolerance, specified as 53.2 V minimum to 58.8 V maximum at IZT = 35 mA, with 40 ±10 ms current application prior to measurement per JEDEC standard. This tolerance applies strictly to the B-suffix device and is guaranteed across the full operating temperature range.
Can 1N5370BG be used in surface-mount designs?
No, the 1N5370BG is an axial-lead through-hole device in Case 017AA plastic package and is not compatible with SMT assembly. Its mechanical design requires 3/8″ lead length for thermal derating and manual or wave soldering; no SMD variant exists in the 1N53 Series.
What is the maximum allowable DC current for continuous operation of 1N5370BG?
The maximum DC zener current (IZM) for 1N5370BG is 280 mA, calculated as 5 W ÷ 56 V nominal. However, actual IZM must not exceed 5 W divided by the unit's measured VZ; for a device measuring 58.8 V, IZM drops to 85 mA to stay within power limit.
How does temperature affect the zener voltage of 1N5370BG?
The 1N5370BG exhibits a positive temperature coefficient of approximately +0.08 %/°C above 5 V. At 56 V, this translates to ~+45 mV/°C drift, meaning VZ increases linearly with junction temperature-critical for designs requiring temperature-compensated references.
Is 1N5370BG suitable for surge protection in 48 V automotive systems?
Yes, the 1N5370BG is rated for 280 A peak non-repetitive surge current at 8.3 ms, exceeding ISO 7637-2 Pulse 5a requirements for 48 V systems. Its 200 °C max pulsed operating temperature and 1.0 μA leakage at 42.6 V make it effective as a secondary clamp after primary GDT suppression.
1N5370BG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 42.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N5370BG FAQ
1.How can I place an order for 1N5370BG through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5370BG 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 1N5370BG reliable?
The price and inventory of 1N5370BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5370BG is usually 5 days.
3.What payment methods are accepted for 1N5370BG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5370BG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5370BG?
1N5370BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5370BG 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 1N5370BG?
For technical support, including 1N5370BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5370BG requirements.
6.How does Aetrix verify that 1N5370BG is sourced from the original manufacturer or authorized distributors?
All 1N5370BG 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 1N5370BG meets industry standards.
7.What is the process for return or replacement of 1N5370BG?
All 1N5370BG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5370BG, 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 1N5370BG part is unused and in its original packaging.
Return procedure for 1N5370BG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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