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onsemi 1N5373BG
- Part No.:
- 1N5373BG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373BG.pdf
- Description:
- DIODE ZENER 68V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:787
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Product details
Overview
1N5373BG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 68 V, ±5% tolerance, 20 Ω maximum zener impedance at 44 mA test current, and 1.52 mA maximum leakage current at 51.7 V. It delivers stable voltage regulation in power supply overvoltage protection circuits and industrial DC rail clamping applications.
For engineers reviewing the 1N5373BG datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, surge current capability (500 A peak @ 8.3 ms), thermal resistance (25 °C/W junction-to-lead), and Pb-free Surmetic 40 plastic package compatibility with wave and reflow soldering.
Technical Context
The 1N5373BG operates as a precision voltage reference and shunt regulator, leveraging silicon-oxide passivated junction technology for tight parameter control and enhanced reliability. Its design supports steady-state dissipation up to 5 W at 25 °C lead temperature, with derating above that point at 40 mW/°C.
It exhibits a positive temperature coefficient typical of higher-voltage Zeners (≈+0.085 %/°C near 68 V), enabling predictable drift behavior in temperature-varying environments. The device is rated for operating junction temperatures from −65 °C to +200 °C, with DC operation limited to 150 °C maximum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 64.6 V (min) to 71.4 V (max) at IZT = 44 mA - defines regulation window under standard test conditions |
| Power Dissipation (PD) | 5 W max at TL = 25 °C - sets absolute continuous power handling limit before thermal derating begins |
| Zener Impedance (ZZT) | 20 Ω max at IZT = 44 mA - determines output voltage stability under load transients |
| Leakage Current (IR) | 1.52 mA max at VR = 51.7 V - quantifies off-state conduction loss in high-impedance bias networks |
| Surge Current (IRM) | 500 A peak @ 8.3 ms - enables transient overvoltage suppression without failure in surge-prone systems |
| Junction-to-Lead RθJL | 25 °C/W - governs thermal path efficiency from die to PCB copper via leads, critical for heatsinking design |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robustness against human-handling electrostatic discharge during assembly |
Pinout & Package
1N5373BG uses an axial-lead, transfer-molded plastic package (Case 017AA, Surmetic 40), with cathode identified by a painted band. Leads are corrosion-resistant and readily solderable, rated for 260 °C at 1/16 inch from case for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to system ground or lower-potential rail; carries forward current during non-regulation states |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage rail requiring clamping; maintains ~68 V across load when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free Surmetic 40 package | RoHS-compliant axial plastic housing with void-free molding and corrosion-resistant leads for automated assembly |
| ±5% zener voltage tolerance | Tight initial calibration per JEDEC 1N53B series standard, reducing need for post-production trimming |
| 180 W surge rating | Validated energy absorption capacity (8.3 ms square wave) for transient immunity in industrial power interfaces |
| Silicon-oxide passivated junction | Enhanced long-term stability and reduced parameter drift versus conventional diffused-junction Zeners |
| Guaranteed six-parameter limits | VZ, IZM, ZZT, ZZK, IZK, and IR all production-tested and binned - improves BOM predictability |
Applications
| Industrial Power Supply Clamp | DC Motor Controller Overvoltage Protection |
|---|---|
Use Scenario: Clamps 72 V DC bus during regenerative braking events in 48 V industrial motor drives. IC Role / Device Role / Timing Role: Shunt regulator placed across bus capacitor to clamp voltage spikes exceeding 68 V nominal. Use Value: Prevents MOSFET avalanche failure by limiting bus voltage to ≤71.4 V (max VZ) with 500 A surge capability. | Use Scenario: Protects microcontroller I/O and analog sensing circuitry from back-EMF transients in brushed DC motor H-bridge drivers. IC Role / Device Role / Timing Role: Zener clamp referenced to local ground, absorbing inductive kick energy during PWM switching transitions. Use Value: Limits transient amplitude to <71.4 V with <20 Ω dynamic impedance, preserving signal integrity in 12-bit ADC front-ends. |
| Programmable Power Supply Reference | Telecom Line Card Surge Suppression |
Use Scenario: Serves as coarse voltage reference in adjustable linear regulator feedback loop for lab-grade bench supplies. IC Role / Device Role / Timing Role: Precision shunt element setting upper regulation threshold; paired with op-amp error amplifier. Use Value: Delivers ±5% VZ accuracy and <20 Ω ZZT to maintain <0.1% load regulation over 1–44 mA range. | Use Scenario: Installed at line interface of 48 V telecom power shelf to suppress lightning-induced surges on distribution rails. IC Role / Device Role / Timing Role: Primary shunt protector on -48 V return path, coordinated with upstream GDT and TVS stages. Use Value: Absorbs 500 A (8.3 ms) surge energy while maintaining clamping voltage ≤71.4 V, meeting GR-1089-CORE Level 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B | Same electrical specs but SnPb lead finish; RoHS non-compliant | Not suitable for Pb-free manufacturing lines; requires separate process validation | Select only if legacy SnPb assembly is mandated and Pb-free exemption applies |
| MMSZ5263BT1G | Surface-mount SOD-123 package; 68 V nominal, 500 mW rating; 30 Ω ZZT | Lower power (0.5 W vs. 5 W); unsuitable for high-energy clamping; better for space-constrained bias networks | Choose for compact PCB layouts where surge energy is low and thermal mass is limited |
Compared with 1N5373B (SnPb) and MMSZ5263BT1G (SMT, 0.5 W), the 1N5373BG provides full 5 W axial-leaded regulation with Pb-free compliance and superior surge handling - making it optimal for industrial power rail protection where thermal mass and lead-frame heat sinking are available.
Availability
1N5373BG is available at Aetrix Electronics and suitable for industrial power supply clamp, DC motor controller overvoltage protection, and telecom line card surge suppression requiring stable component supply and long-lifecycle support.
Supply support for 1N5373BG 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 is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The 1N53 Series belongs to onsemi's discrete Zener regulator product line, engineered for high-reliability voltage reference and overvoltage protection in harsh-environment power systems.
FAQ
What is the exact zener voltage tolerance for the 1N5373BG?
The 1N5373BG has a guaranteed ±5% zener voltage tolerance, with minimum, nominal, and maximum values of 64.6 V, 68 V, and 71.4 V respectively, measured at IZT = 44 mA and TA = 25 °C. This tolerance is defined per JEDEC 1N53B-series standards and applies to all units bearing the "B" suffix.
Can the 1N5373BG be used in surface-mount designs?
No - the 1N5373BG uses an axial-lead, through-hole Surmetic 40 package (Case 017AA) and is not compatible with SMT assembly processes. For surface-mount alternatives, consider the MMSZ5263BT1G (SOD-123, 68 V, 0.5 W), though it lacks the 5 W power rating and 500 A surge capability of the 1N5373BG.
What is the maximum allowable surge current for the 1N5373BG?
The 1N5373BG is rated for a peak non-repetitive surge current of 500 A at an 8.3 ms pulse width, as specified in the onsemi datasheet. This value corresponds to the maximum energy the device can absorb without failure under single-event transient conditions.
How does thermal derating work for the 1N5373BG?
The 1N5373BG derates linearly above 25 °C lead temperature at 40 mW/°C. At 75 °C lead temperature, its maximum steady-state power drops to 3 W (5 W − (50 °C × 0.04 W/°C)). Derating is based on junction-to-lead thermal resistance of 25 °C/W and assumes 3/8″ lead length to heatsink.
Is the 1N5373BG suitable for automotive applications?
The 1N5373BG is not AEC-Q101 qualified and is not recommended for automotive safety-critical systems. While its operating temperature range (−65 °C to +200 °C) exceeds typical automotive under-hood requirements, onsemi does not certify this part for automotive use - consult AEC-Q101-qualified Zeners like the NZ9F68ST5G for such applications.
1N5373BG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 44 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 51.7 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
1N5373BG FAQ
1.How can I place an order for 1N5373BG through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373BG 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 1N5373BG reliable?
The price and inventory of 1N5373BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373BG is usually 5 days.
3.What payment methods are accepted for 1N5373BG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373BG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373BG?
1N5373BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373BG 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 1N5373BG?
For technical support, including 1N5373BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373BG requirements.
6.How does Aetrix verify that 1N5373BG is sourced from the original manufacturer or authorized distributors?
All 1N5373BG 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 1N5373BG meets industry standards.
7.What is the process for return or replacement of 1N5373BG?
All 1N5373BG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373BG, 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 1N5373BG part is unused and in its original packaging.
Return procedure for 1N5373BG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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