My Inquiry
My Account
Diodes Incorporated 1SMB5915B-13
- Part No.:
- 1SMB5915B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5915B-13.pdf
- Description:
- DIODE ZENER 3.9V 550MW SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,742
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMB5915B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with nominal zener voltage 3.9V (min 3.7V, max 4.1V), ±5% tolerance, and 96.1mA maximum zener test current at 7.5mA. It provides precise voltage regulation in low-voltage power supply rails and overvoltage protection circuits, operating across -65°C to +150°C.
For engineers reviewing the 1SMB5915B-13 datasheet, 1SMB5915B-13 pinout, 1SMB5915B-13 application, or 1SMB5915B-13 equivalent, key selection criteria include zener voltage accuracy, dynamic impedance (500Ω @ IZT), thermal resistance (226°C/W), and SMB package compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 3.0W power dissipation rating applies at TL = +75°C with 40mW/°C derating above that point, and it achieves 25°C/W junction-to-terminal thermal resistance when mounted on copper pads per AP02001 layout.
The device exhibits 500Ω maximum zener impedance at 7.5mA test current and 1Ω at knee current (IZK = 1mA), with <25µA reverse leakage at VR = 1V. Its ESD rating exceeds 16kV (HBM Class 3), and it complies with RoHS, halogen-free, and antimony-free "Green" requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9V nominal (3.7–4.1V range); sets precise clamping level for 3.3V–5V rail protection |
| Power Dissipation (PD) | 3.0W at TL = +75°C; supports sustained regulation in thermally constrained PCB layouts |
| Zener Test Current (IZT) | 7.5mA; defines operating point where VZ and ZZT are specified and optimized |
| Zener Impedance (ZZT) | 500Ω max @ IZT; determines AC regulation stability under transient load changes |
| Thermal Resistance (RθJA) | 226°C/W; indicates required PCB copper area and airflow for safe continuous operation |
| ESD Rating | Class 3 (>16kV HBM); enables robust handling in automated assembly without external protection |
| Operating Temperature | -65°C to +150°C; suitable for automotive under-hood and industrial control environments |
Pinout & Package
Package: SMB (Surface Mount B) molded plastic case, UL 94V-0 rated, 3.30–3.94mm length × 4.06–4.57mm width × 1.96–2.21mm height, cathode band polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated rail; supplies stable 3.9V reference when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| 3.0W Power Handling | Enables single-device overvoltage clamping in 5V systems without parallel stacking |
| ±5% Zener Tolerance | Ensures predictable trip point for precision voltage monitoring and feedback loops |
| Low Dynamic Impedance | 500Ω max at 7.5mA ensures minimal voltage shift under load transients |
| SMB Package Compatibility | Standardized footprint supports high-speed pick-and-place and reflow soldering per J-STD-020 Level 1 |
| 16kV HBM ESD Robustness | Eliminates need for external ESD protection in board-level input conditioning stages |
Applications
| USB Port Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamps 5V USB VBUS line against ESD strikes and hot-plug surges. IC Role / Device Role: Primary overvoltage clamp protecting downstream USB transceivers and power switches. Use Value: 3.9V breakdown prevents damage to 3.3V logic interfaces while maintaining USB 2.0 compliance. | Use Scenario: Provides clean, temperature-stable reset threshold for ARM Cortex-M microcontrollers. IC Role / Device Role: Precision voltage reference triggering POR (power-on reset) and brown-out detection. Use Value: ±5% tolerance and low TC ensure reliable reset assertion across -40°C to +85°C ambient. |
| Industrial Sensor Signal Conditioning | DC-DC Converter Feedback Divider |
Use Scenario: Stabilizes excitation voltage for 4–20mA current-loop sensors in PLC analog inputs. IC Role / Device Role: Low-noise voltage reference source for op-amp biasing and ADC reference scaling. Use Value: 226°C/W RθJA allows direct mounting near sensor front-end without thermal runaway risk. | Use Scenario: Sets output voltage of isolated flyback converter via optocoupler feedback network. IC Role / Device Role: Secondary-side voltage reference enabling accurate 12V or 15V output regulation. Use Value: 500Ω ZZT minimizes feedback loop error under dynamic load steps, improving transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5338B | Same 3.9V nominal VZ but DO-15 package (axial leaded); 5W PD; higher RθJA (~300°C/W) | Requires through-hole assembly; less suitable for high-density SMT designs | Select when legacy through-hole compatibility or higher peak power is needed |
| BZX84-C3V9 | 3.9V VZ, SOT-23 package; 300mW PD; ±5% tolerance; 90Ω ZZT @ 5mA | Limited to low-power signal-level regulation; not rated for 3W continuous dissipation | Select only for space-constrained signal conditioning, not power rail clamping |
Compared with 1N5338B and BZX84-C3V9, the 1SMB5915B-13 uniquely balances high power (3.0W), SMT compatibility (SMB), and tight regulation (500Ω impedance), making it optimal for compact, thermally demanding 3.3V/5V system protection.
Availability
1SMB5915B-13 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, and industrial sensor excitation requiring stable component supply and consistent Zener voltage performance across production batches.
Supply support for 1SMB5915B-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The 1SMB59xxB series belongs to Diodes' high-power Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in surface-mount power supply and interface protection applications.
FAQ
What is the maximum continuous power dissipation for 1SMB5915B-13 at +25°C ambient?
At TA = +25°C, the maximum continuous power dissipation is 550mW, with a derating factor of 4.4mW/°C above +25°C. This value assumes standard FR-4 PCB mounting with Diodes Inc.'s recommended pad layout (AP02001). Exceeding this limit risks thermal runaway and parametric shift.
Does 1SMB5915B-13 have a defined zener impedance at low current levels?
Yes - its maximum zener impedance at knee current (IZK = 1mA) is 500Ω, measured with AC signal superimposed on DC bias. This value reflects regulation quality under light-load or standby conditions, critical for low-power sensor biasing and reset circuit stability.
Can 1SMB5915B-13 be used in place of a 3.3V Zener diode for 3.3V rail protection?
No - its nominal 3.9V breakdown exceeds typical 3.3V rail tolerance (±10%). Using it for 3.3V clamping would allow up to ~4.1V before conduction, risking overvoltage damage to 3.3V logic. A 1SMB5913B (3.3V nominal) is the correct variant for that application.
Is the SMB package of 1SMB5915B-13 compatible with IPC-7351 standard footprints?
Yes - the SMB outline dimensions (3.30–3.94mm × 4.06–4.57mm × 1.96–2.21mm) align with IPC-7351B "SMB" land pattern recommendations. Diodes Inc. provides verified pad layout AP02002, confirming compatibility with standard SMT stencil design and reflow profiles.
1SMB5915B-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 550 mW
- Impedance (Max) (Zzt):
- 7.5 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB5915B-13 FAQ
1.How can I place an order for 1SMB5915B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5915B-13 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 1SMB5915B-13 reliable?
The price and inventory of 1SMB5915B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5915B-13 is usually 5 days.
3.What payment methods are accepted for 1SMB5915B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5915B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5915B-13?
1SMB5915B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5915B-13 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 1SMB5915B-13?
For technical support, including 1SMB5915B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5915B-13 requirements.
6.How does Aetrix verify that 1SMB5915B-13 is sourced from the original manufacturer or authorized distributors?
All 1SMB5915B-13 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 1SMB5915B-13 meets industry standards.
7.What is the process for return or replacement of 1SMB5915B-13?
All 1SMB5915B-13 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5915B-13, 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 1SMB5915B-13 part is unused and in its original packaging.
Return procedure for 1SMB5915B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5915B-13 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
