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onsemi 1N5388B
- Part No.:
- 1N5388B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5388B.pdf
- Description:
- DIODE ZENER 200V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,759
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Product details
Overview
1N5388B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 200 V, ±5% tolerance, maximum zener impedance of 5 Ω at 480 mA test current, and surge rating of 1850 A at 8.3 ms. It operates from −65°C to +200°C and is used for precision voltage regulation in high-voltage DC power supply clamping and overvoltage protection circuits.
For engineers reviewing the 1N5388B datasheet, pinout, applications, or equivalent options, key selection criteria include its 200 V nominal zener voltage, 5 W steady-state power dissipation, 5 Ω zener impedance at IZT = 480 mA, low leakage current (0.5 mA at VR = 152 V), and axial leaded Surmetic 40 package compatibility with through-hole PCB assembly.
Technical Context
This device uses silicon-oxide passivated junction technology to achieve tight voltage tolerance and stable regulation under varying thermal and load conditions. Its zener voltage is specified at two test currents (10% and 50% of IZM) with 40 ms pulse duration, ensuring repeatable regulation performance in transient-suppression applications.
The 1N5388B exhibits a positive temperature coefficient above 10 V (≈0.9 mV/°C per Figure 3), enabling predictable drift compensation in series-connected regulator designs. Its junction-to-lead thermal resistance is 25 °C/W at 3/8″ lead length, supporting reliable power handling when mounted with standard axial-lead heatsinking practices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 190–210 V (±5% tolerance; regulates at 200 V nominal under 480 mA DC test current) |
| Power Dissipation (PD) | 5 W at TL = 25°C (derates 40 mW/°C above 25°C; supports continuous clamp operation) |
| Zener Impedance (ZZT) | 5 Ω max at IZT = 480 mA (ensures minimal voltage shift under dynamic load changes) |
| Leakage Current (IR) | 0.5 mA max at VR = 152 V (low off-state conduction preserves upstream circuit efficiency) |
| Surge Current (IRM) | 1850 A peak at 8.3 ms (handles lightning-induced transients in industrial power inputs) |
| Operating Temperature | −65°C to +200°C (enables use in under-hood automotive, downhole, or high-temp industrial environments) |
| ESD Rating | Class 3 (>16 kV HBM) (survives handling without external protection circuitry) |
Pinout & Package
Package: Axial-lead Surmetic 40 plastic case (Case 017AA), void-free transfer-molded thermosetting material, cathode indicated by band, leads solderable up to 260°C for 10 seconds at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node in reverse-bias regulation; defines polarity for correct orientation in clamping circuits |
| Cathode | Zener breakdown terminal / Regulation output node | Connected to regulated rail; carries full zener current during overvoltage events; marked with band for visual identification |
Key Features
| Feature | Design Value |
|---|---|
| 5 W steady-state power rating | Enables robust overvoltage clamping in 24–48 V industrial systems without external heat sinking |
| ±5% zener voltage tolerance | Reduces binning requirements and simplifies BOM management across production lots |
| 1850 A surge capability at 8.3 ms | Meets IEC 61000-4-5 Level 4 surge immunity without additional TVS staging |
| Silicon-oxide passivated junction | Delivers long-term parameter stability and low parameter drift over 10+ year service life |
| Pb-free compliant packaging | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
Applications
| Industrial Power Supply Clamping | Automotive ECU Overvoltage Protection |
|---|---|
Use Scenario: Clamp transient spikes on 24 V DC bus in PLC power modules during relay switching or inductive load turn-off. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy to ground. Use Value: Maintains bus voltage ≤210 V during 1850 A surges, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Protect engine control unit input pins from load-dump transients exceeding 120 V in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: High-energy crowbar element absorbing >5 J pulses within 8.3 ms window. Use Value: Withstands ISO 7637-2 Pulse 5a (load dump) without degradation, eliminating need for parallel MOVs. |
| High-Voltage Sensor Reference | Telecom Line Card Surge Suppression |
Use Scenario: Provide stable 200 V reference for analog front-end scaling in HV battery monitoring systems. IC Role / Device Role / Timing Role: Precision voltage reference source in ratiometric measurement chains. Use Value: Low 5 Ω dynamic impedance ensures <0.1% reference error under 400 mA sensor bias current variation. | Use Scenario: Secondary-level surge suppression on -48 V telecom distribution lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response voltage clamp protecting line interface ICs and isolation transformers. Use Value: 200 V nominal clamping voltage aligns with ITU-T K.20 coordination requirements for Class B equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5388BRLG | Tape-and-reel packaging (4000 units); identical electrical specs and Surmetic 40 package | Optimized for automated SMT placement with axial-lead carrier tape; same thermal and electrical behavior | Select for high-volume production requiring pick-and-place compatibility |
| SMF200A | Surface-mount SOD-123FL package; 200 V nominal, 1 W rating, 100 Ω ZZT at 1 mA | Lower power handling and higher impedance limit use to low-current signal-level protection only | Choose only for space-constrained PCBs where 5 W dissipation is not required |
Compared with 1N5388B, the 1N5388BRLG offers identical regulation performance in tape-and-reel format for automated assembly, while the SMF200A provides surface-mount convenience at the cost of 80% lower power rating and significantly higher dynamic impedance-making it unsuitable for high-current clamping roles.
Availability
1N5388B is available at Aetrix Electronics and suitable for industrial power supply clamping, automotive ECU overvoltage protection, and high-voltage sensor reference applications requiring stable component supply and long-lifecycle support.
Supply support for 1N5388B 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1N53 Series is designed for high-reliability voltage regulation and transient suppression in harsh-environment power systems, emphasizing tight tolerance, high surge resilience, and extended temperature operation.
FAQ
What is the exact zener voltage range for the 1N5388B?
The 1N5388B has a guaranteed zener voltage range of 190 V to 210 V at IZT = 480 mA and TA = 25°C, reflecting its ±5% tolerance per JEDEC specification. This range is validated during production testing and applies to every unit shipped. The nominal value is 200 V, and the device maintains regulation within this band under steady-state DC conditions and short-duration surges up to 8.3 ms.
Can the 1N5388B be used in surface-mount designs?
No, the 1N5388B is an axial-lead through-hole device in Surmetic 40 plastic package (Case 017AA) and is not compatible with surface-mount assembly. It requires drilled PCB pads and wave or hand soldering. For SMT alternatives, consider the SMF200A (SOD-123FL) or P6SMB200A (DO-214AA), though both have lower power ratings and different impedance characteristics than the 1N5388B.
What is the maximum allowable surge current for the 1N5388B?
The 1N5388B supports a maximum non-repetitive surge current of 1850 A at 8.3 ms pulse width, as specified in the onsemi datasheet. This rating assumes single-event, square-wave excitation and is validated per IEC 61000-4-5 surge test methodology. Repeated surges must respect thermal limits and duty cycle constraints defined in Figure 4 of the datasheet to avoid junction overheating.
How does temperature affect the zener voltage of the 1N5388B?
The 1N5388B exhibits a positive temperature coefficient of approximately +0.9 mV/°C at IZT, as shown in Figure 3 of the onsemi datasheet. This means its zener voltage increases linearly with junction temperature - e.g., a 50°C rise above 25°C raises VZ by ~45 mV. Designers must account for this drift in precision reference applications using the thermal resistance model (θJL = 25 °C/W) and ambient conditions.
Is the 1N5388B RoHS-compliant and lead-free?
Yes, the 1N5388B is RoHS-compliant and offered in Pb-free packaging, indicated by the "G" suffix in ordering codes such as 1N5388BG or 1N5388BRLG. It meets EU Directive 2011/65/EU and is qualified to JEDEC J-STD-020 moisture sensitivity level 1, allowing indefinite floor life at ≤30°C/60% RH without dry-pack requirements.
1N5388B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 200 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 480 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 152 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
1N5388B FAQ
1.How can I place an order for 1N5388B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5388B 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 1N5388B reliable?
The price and inventory of 1N5388B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5388B is usually 5 days.
3.What payment methods are accepted for 1N5388B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5388B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5388B?
1N5388B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5388B 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 1N5388B?
For technical support, including 1N5388B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5388B requirements.
6.How does Aetrix verify that 1N5388B is sourced from the original manufacturer or authorized distributors?
All 1N5388B 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 1N5388B meets industry standards.
7.What is the process for return or replacement of 1N5388B?
All 1N5388B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5388B, 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 1N5388B part is unused and in its original packaging.
Return procedure for 1N5388B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5388B Tags
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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