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Taiwan Semiconductor Corporation SMBJ15H
- Part No.:
- SMBJ15H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ15H.pdf
- Description:
- 600W, 18.6V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,295
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Product details
Overview
SMBJ15H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 15 V working stand-off voltage (VWM), 16.7–20.4 V breakdown voltage (VBR), 23.1 A peak pulse current (IPP), 26.9 V maximum clamping voltage (VC), and 600 W peak pulse power (PPK) with DO-214AA (SMB) package. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and inductive-switching immunity.
For engineers reviewing the SMBJ15H datasheet, SMBJ15H pinout, SMBJ15H application, or SMBJ15H equivalent, key selection criteria include clamping performance under 10/1000 µs transients, leakage current at 15 V (<1 µA), thermal derating above 25°C, and compatibility with automated SMT placement on 12 V nominal systems such as automotive body control modules and industrial sensor interfaces.
Technical Context
The SMBJ15H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold to clamp transient energy into ground. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while its 10 °C/W junction-to-case thermal resistance supports sustained surge handling in compact PCB layouts.
Designed for compliance with ISO 7637-2, it withstands repetitive load-dump pulses up to 12 V system-level stress without degradation. The device's fast response time (<1.0 ps) enables effective suppression of EFT bursts and electrostatic discharges before sensitive downstream ICs experience overvoltage damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins; matches 12 V automotive supply rails with margin. |
| VBR min/max | 16.7 / 20.4 V - Breakdown occurs within this range at 1 mA test current; defines turn-on consistency across production lots. |
| VC @ IPP | 26.9 V - Clamped voltage at 23.1 A peak pulse (10/1000 µs); limits downstream voltage stress during worst-case surge. |
| IPP | 23.1 A - Peak surge current capability at rated clamping voltage; determines survivability against ISO 7637-2 Pulse 1 (inductive kick). |
| PPK | 600 W - Non-repetitive peak pulse power rating; defines single-event energy absorption capacity. |
| ID @ VWM | <1 µA - Reverse leakage at 15 V; ensures minimal standby power loss and signal integrity in always-on circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Case material is UL 94V-0 rated molding compound; terminals are matte tin-plated for J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side (cathode-banded end is cathode) | Connected to protected line (e.g., 12 V rail); conducts to ground when transient exceeds VBR. |
| Cathode | Output side (marked by band) | Connected to system ground; provides low-impedance path for surge current during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress conditions defined in AEC-Q101 Rev D. |
| Glass-passivated junction | Ensures stable VBR tolerance, low leakage drift over time, and resistance to humidity-induced parameter shift in harsh environments. |
| ISO 7637-2 compliance | Guarantees robustness against standardized automotive transients: Pulse 1 (inductive switch-off), Pulse 2a (battery disconnect), Pulse 3a/b (capacitive coupling), and Pulse 2b (load dump). |
| Moisture sensitivity level 1 | Enables unlimited floor life before reflow; eliminates baking requirement and simplifies SMT manufacturing flow. |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Transceiver Protection |
|---|---|
Use Scenario: Protecting 12 V power input to BCM microcontroller and peripheral drivers from load-dump surges and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local DC/DC input, clamping transients before they reach LDOs and logic ICs. Use Value: Limits clamped voltage to 26.9 V, well below 36 V absolute max ratings of typical automotive MCUs and PMICs, preventing latch-up or permanent damage. | Use Scenario: Safeguarding CANH/CANL lines in industrial gateways exposed to EFT and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional protection not applicable - SMBJ15H used on VCC rail feeding isolated CAN transceivers, not on data lines. Use Value: Withstands 23.1 A peak surge at 10/1000 µs, enabling reliable operation in EN 61000-4-4 Level 4 (4 kV) environments without derating. |
| LED Headlamp Driver Input Stage | Smart Sensor Node Power Rail |
Use Scenario: Shielding buck controller ICs and MOSFET gate drivers in automotive LED headlamps from inductive switching spikes during PWM dimming. IC Role / Device Role / Timing Role: TVS placed upstream of input filter capacitor on 12 V input, absorbing energy from relay coil or motor back-EMF. Use Value: Fast <1.0 ps response ensures clamping initiates before 100 ns rise-time transients exceed IC absolute maximum ratings. | Use Scenario: Securing 3.3 V or 5 V regulated supply to IoT sensor nodes powered from 12 V vehicle bus via DC/DC converter. IC Role / Device Role / Timing Role: Secondary-stage TVS on post-regulation rail, providing final overvoltage barrier before MCU and analog front-end. Use Value: Leakage <1 µA at 15 V prevents measurable quiescent current increase in battery-powered applications with multi-year sleep cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A | Narrower VBR range (16.7–18.5 V vs. 16.7–20.4 V); lower clamping voltage (24.4 V vs. 26.9 V) at same IPP. | Better suited for tighter voltage-margin designs where lower VC reduces risk of downstream overstress. | Select SMBJ15A if system-level clamping budget is ≤25 V; SMBJ15H preferred when higher VBR tolerance is needed for production spread or temperature drift. |
| SMCJ15H | Same VWM/VBR specs but larger DO-214AB (SMC) package; higher PPK (1500 W) and IPP (64.5 A). | Used where higher surge energy handling is required, e.g., main battery feed rather than branch circuit protection. | Choose SMBJ15H for space-constrained SMT layouts; select SMCJ15H only when board area allows and surge duty cycle demands >600 W rating. |
Compared with SMBJ15A and SMCJ15H, the SMBJ15H offers balanced clamping performance and footprint efficiency for mid-tier automotive and industrial 12 V rail protection - narrower VBR tolerance than SMBJ15A but smaller size and lower cost than SMCJ15H.
Availability
SMBJ15H is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and LED lighting systems requiring stable component supply with AEC-Q101 qualification and ISO 7637-2 compliance.
Supply support for SMBJ15H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12 V–48 V automotive and industrial power distribution networks, emphasizing reliability under thermal cycling and high-energy surge stress.
FAQ
What is the maximum clamping voltage of SMBJ15H under standard 10/1000 µs surge conditions?
The SMBJ15H has a maximum clamping voltage (VC) of 26.9 V when subjected to its rated peak pulse current of 23.1 A using the standard 10/1000 µs waveform. This value is measured at TA = 25°C and represents the upper limit of voltage seen by downstream components during a worst-case transient event. Designers must verify that all protected ICs have absolute maximum voltage ratings exceeding 26.9 V.
Is SMBJ15H suitable for bidirectional transient protection?
No, SMBJ15H is a unidirectional TVS diode intended for DC power rail protection where polarity is fixed. For bidirectional signal-line protection (e.g., CAN, USB, RS-485), a bipolar variant such as SMBJ15CH or SMBJ15CAH must be used. The SMBJ15H cathode band indicates polarity and must be oriented toward ground; reverse connection will result in forward conduction and failure.
Does SMBJ15H require derating at elevated ambient temperatures?
Yes, SMBJ15H must be derated above TA = 25°C per Figure 2 in the datasheet. Its peak pulse power (PPK) decreases linearly to zero at +150°C ambient, with a derating factor of approximately 0.8% per °C above 25°C. At 85°C ambient, usable PPK drops to ~50% of the rated 600 W, directly impacting surge survivability in under-hood applications.
What is the marking code for SMBJ15H and how is it identified on the device?
The SMBJ15H is marked with the code "LL" on the cathode-banded surface of the DO-214AA (SMB) package. The band denotes the cathode terminal, and the two-character alphanumeric code is laser-etched or printed adjacent to it. This marking aligns with Taiwan Semiconductor's standardized coding scheme for the SMBJH series and is verified in the Electrical Specifications table on page 2 of the datasheet.
How does SMBJ15H compare to SMAJ15A in terms of surge handling capability?
SMBJ15H delivers higher surge robustness than SMAJ15A: it offers 600 W PPK versus 400 W for SMAJ15A, and 23.1 A IPP versus 15.4 A. Both share the same DO-214 package outline, but SMBJ15H uses thicker die and optimized metallization to sustain greater energy. SMAJ15A is limited to lower-duty applications like consumer electronics, whereas SMBJ15H targets automotive and industrial use per AEC-Q101 and ISO 7637-2.
SMBJ15H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 26.9V
- Current - Peak Pulse (10/1000µs):
- 23.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ15H FAQ
1.How can I place an order for SMBJ15H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ15H 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 SMBJ15H reliable?
The price and inventory of SMBJ15H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ15H is usually 5 days.
3.What payment methods are accepted for SMBJ15H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ15H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ15H?
SMBJ15H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ15H 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 SMBJ15H?
For technical support, including SMBJ15H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ15H requirements.
6.How does Aetrix verify that SMBJ15H is sourced from the original manufacturer or authorized distributors?
All SMBJ15H 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 SMBJ15H meets industry standards.
7.What is the process for return or replacement of SMBJ15H?
All SMBJ15H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ15H, 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 SMBJ15H part is unused and in its original packaging.
Return procedure for SMBJ15H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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