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Diodes Incorporated 1SMB5953B-13
- Part No.:
- 1SMB5953B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5953B-13.pdf
- Description:
- DIODE ZENER 150V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:1,513
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Product details
Overview
1SMB5953B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with nominal zener voltage 150V (min 142.5V, max 157.5V), ±5% tolerance, 2.5mA test current, and 6000Ω maximum zener impedance at 0.25mA. It provides precise voltage regulation in high-voltage DC power supply rails and overvoltage protection circuits.
For engineers reviewing the 1SMB5953B-13 datasheet, 1SMB5953B-13 pinout, 1SMB5953B-13 application, or 1SMB5953B-13 equivalent, this device is selected for stable 150V reference generation, transient suppression in industrial control inputs, and clamping in telecom line interface circuits where ESD robustness (>16kV HBM) and RoHS-compliant lead-free plating are required.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its terminals under varying load and temperature conditions. Its 150V nominal zener voltage targets high-side rail monitoring and telecom interface protection, where low leakage (<0.25µA at 114V) and predictable temperature coefficient (≈+0.12%/°C typical) are critical.
The SMB package enables automated SMT assembly while delivering 3.0W power dissipation at TL=+75°C and thermal resistance of 25°C/W junction-to-terminal. Its 226°C/W junction-to-ambient rating assumes FR-4 PCB mounting per AP02001 pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 150 V - Stable regulation point for high-voltage DC rails and clamp thresholds |
| Zener Voltage Range | 142.5–157.5 V - Ensures design margin for 150V target under ±5% tolerance |
| Test Current (IZT) | 2.5 mA - Standard bias condition for measuring VZ and ZZT |
| Max Zener Impedance (ZZT) | 6000 Ω @ 0.25mA - Defines dynamic response to fast transients at low current |
| Max Reverse Current (IR) | 0.25 µA @ 114 V - Confirms tight leakage control below 76% of VZ for low-power standby |
| Power Dissipation (PD) | 3.0 W @ TL = +75°C - Supports sustained clamping in industrial ambient conditions |
| ESD Rating | Class 3 (>16 kV HBM) - Enables direct placement on exposed I/O lines without external ESD protection |
Pinout & Package
Package: SMB (Surface Mount Body), molded plastic case rated UL 94V-0, cathode band marking, 0.096g weight. Dimensions: 3.30–3.94 mm (A), 4.06–4.57 mm (B), 1.96–2.21 mm (C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Low-voltage reference node | Connected to system ground or lower-potential rail during Zener operation |
| Cathode | Reverse-biased Zener terminal / High-voltage reference node | Connected to regulated rail or protected signal line; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| 3.0W Power Handling | Enables single-device overvoltage clamping in 24–48V industrial systems without heatsinking |
| ±5% Zener Tolerance | Reduces binning requirements and simplifies BOM management for 150V reference designs |
| ESD Class 3 (>16kV HBM) | Eliminates need for discrete TVS diodes on low-speed analog or control inputs |
| Lead-Free & Halogen-Free | Meets RoHS 3 and JEDEC green standards for automotive and medical end equipment |
| SMB Package Compatibility | Supports high-volume pick-and-place assembly with standard reflow profiles (J-STD-020 Level 1) |
Applications
| Industrial PLC Analog Input Protection | Telecom Line Interface Clamping |
|---|---|
|
Use Scenario: Protecting 0–10V/4–20mA analog input channels from induced surges and ESD events in factory automation cabinets. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp input voltage to ≤157.5V and shunt fault current to ground. Use Value: Prevents damage to precision ADC front-ends by limiting excursion beyond 150V ±5%, leveraging 6000Ω dynamic impedance to absorb 2.5mA transients. |
Use Scenario: Safeguarding RS-232/RS-485 transceiver pins against lightning-induced surges and hot-plug ESD in base station backhaul modules. IC Role / Device Role / Timing Role: Standoff voltage limiter placed between data line and chassis ground to suppress >114V transients before they reach IC I/O structures. Use Value: Achieves >16kV HBM immunity without additional components, reducing board area and enabling compact modular designs. |
| High-Voltage DC Power Supply Regulation | Automotive Battery Monitoring Reference |
|
Use Scenario: Generating stable 150V reference for feedback loops in isolated flyback converters powering industrial sensors. IC Role / Device Role / Timing Role: Precision voltage reference source providing fixed VZ with <±5% variation across temperature and current. Use Value: Maintains output regulation accuracy within ±1.5V over full operating range, supporting ±1% output tolerance in 400V input supplies. |
Use Scenario: Providing calibrated overvoltage detection threshold for 12V/24V battery management systems in commercial vehicles. IC Role / Device Role / Timing Role: Zener-based comparator reference that triggers shutdown when battery voltage exceeds 157.5V during alternator fault conditions. Use Value: Delivers repeatable trip point with <0.25µA leakage at 114V, minimizing quiescent current drain in always-on monitoring circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5953B | Same 150V VZ, but DO-41 through-hole package; 1.0W PD; higher RθJA (500°C/W) | Requires manual soldering; unsuitable for high-density SMT layouts or automated production | Select only for legacy repair or prototyping where footprint compatibility is secondary |
| SMBJ150A | TVS diode (not Zener); 150V standoff, 24.4A peak pulse current; bidirectional clamping | Designed for surge suppression (8/20µs), not precision regulation; higher leakage at DC | Choose for lightning-level transients; avoid where stable DC reference or low IR is required |
Compared with 1N5953B and SMBJ150A, the 1SMB5953B-13 uniquely balances precision 150V regulation, 3.0W continuous dissipation, and SMT manufacturability-making it optimal for production-grade industrial power and protection circuits requiring both accuracy and reliability.
Availability
1SMB5953B-13 is available at Aetrix Electronics and suitable for industrial PLC analog input protection, telecom line interface clamping, and high-voltage DC power supply regulation requiring stable component supply and RoHS-compliant sourcing.
Supply support for 1SMB5953B-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
This device belongs to the SMB-series 3.0W Zener diode family, engineered for high-reliability voltage regulation and transient suppression in industrial, telecom, and automotive power systems where precision, ESD robustness, and SMT scalability are essential.
FAQ
What is the maximum continuous power dissipation for 1SMB5953B-13 at +75°C?
The 1SMB5953B-13 delivers 3.0W maximum power dissipation at terminal temperature (TL) of +75°C. Above this temperature, it derates linearly at 40mW/°C. This rating assumes proper PCB copper land pattern per Diodes Inc. AP02001 layout, ensuring reliable thermal performance in industrial environments.
How does the ±5% zener voltage tolerance affect circuit design?
The ±5% tolerance means the actual VZ falls between 142.5V and 157.5V at 2.5mA. Designers must size series resistors and verify clamping margins accordingly-e.g., ensure worst-case 142.5V still exceeds system overvoltage trip thresholds while 157.5V remains below IC absolute maximum ratings.
Can 1SMB5953B-13 replace a 1N5953B in an existing design?
No direct replacement: 1SMB5953B-13 uses SMB SMT packaging versus DO-41 through-hole for 1N5953B, and offers 3× higher power (3.0W vs. 1.0W). Board redesign is required for footprint and thermal layout; electrical parameters match closely, but thermal performance and assembly process differ significantly.
What is the significance of the 0.25µA reverse current specification at 114V?
This value specifies leakage current at 76% of nominal VZ (114V = 0.76 × 150V), confirming minimal DC loading on high-impedance nodes. It ensures negligible error in precision reference applications and supports ultra-low-quiescent-current designs where standby power budget is constrained.
1SMB5953B-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 150 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 600 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 114 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB5953B-13 FAQ
1.How can I place an order for 1SMB5953B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5953B-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 1SMB5953B-13 reliable?
The price and inventory of 1SMB5953B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5953B-13 is usually 5 days.
3.What payment methods are accepted for 1SMB5953B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5953B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5953B-13?
1SMB5953B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5953B-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 1SMB5953B-13?
For technical support, including 1SMB5953B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5953B-13 requirements.
6.How does Aetrix verify that 1SMB5953B-13 is sourced from the original manufacturer or authorized distributors?
All 1SMB5953B-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 1SMB5953B-13 meets industry standards.
7.What is the process for return or replacement of 1SMB5953B-13?
All 1SMB5953B-13 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5953B-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 1SMB5953B-13 part is unused and in its original packaging.
Return procedure for 1SMB5953B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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