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Taiwan Semiconductor Corporation SMBJ24H
- Part No.:
- SMBJ24H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ24H.pdf
- Description:
- 600W, 29.7V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,316
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Product details
Overview
SMBJ24H from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade circuit protection. It features a 24V working stand-off voltage (VWM), 26.7–32.6V breakdown voltage (VBR), and clamps transients to ≤43.0V at 14.6A peak pulse current (IPP), meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements for vehicle electronics.
For engineers reviewing the SMBJ24H datasheet, SMBJ24H pinout, SMBJ24H application, or SMBJ24H equivalent, key selection considerations include its AEC-Q101 qualification, DO-214AA (SMB) package compatibility with automated placement, glass-passivated junction for stable clamping, sub-1ps response time, and <1µA leakage above 10V - critical for low-power ECU and sensor interface protection.
Technical Context
The SMBJ24H operates as a unidirectional avalanche diode, leveraging a glass-passivated PN junction to provide fast, repeatable clamping of voltage transients induced by inductive switching, ESD, or load dump events. Its thermal design supports 150°C maximum junction temperature and 10°C/W junction-to-case resistance, enabling reliable operation under sustained ambient conditions up to 125°C when derated per Fig. 2.
It complies with ISO 7637-2 for automotive electrical disturbances and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity. The device exhibits ≤1.0ps response time and maintains <1µA blocking leakage at 24V, ensuring minimal standby power impact in always-on vehicle subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24V automotive systems. |
| VBR min/max | 26.7 V / 32.6 V - Breakdown occurs within this range at 1 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPP | 43.0 V - Clamped voltage at 14.6 A peak impulse current (10/1000 µs); limits downstream IC stress during ISO 7637-2 Pulse 2b events. |
| PPK | 600 W - Non-repetitive peak pulse power handling; sustains high-energy transients without failure under defined waveform conditions. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; preserves battery life in low-current sleep modes of automotive modules. |
| TJ max | +150 °C - Maximum junction temperature; enables use in engine bay or under-hood applications with appropriate PCB thermal relief. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional configuration. Cathode indicated by band marking; anode and cathode terminals are axially oriented along the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Input/line side terminal | Connected to protected line (e.g., 24V supply rail); carries surge current into the device during clamping. |
| Cathode (banded end) | Clamp reference terminal | Connected to ground or low-impedance return path; establishes clamping reference and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for ECU, ADAS, and body control modules. |
| Glass-passivated junction | Stable VBR and low leakage over lifetime and temperature; eliminates passivation-related drift common in epoxy-coated TVS devices. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - covers full automotive transient immunity scope. |
| Moisture sensitivity Level 1 | No floor life limitation or baking requirement before reflow; compatible with standard SMT assembly lines without special handling. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24V power rails in engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤43.0 V during ISO 7637-2 Pulse 2b events, preventing damage to 36V-rated input capacitors and LDOs. |
Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) in industrial PLC I/O modules from EFT and cable discharge. IC Role / Device Role / Timing Role: Front-end transient suppressor on signal lines entering isolated ADC front-ends. Use Value: Sub-1ps response ensures clamping before sensitive op-amps or SAR ADCs experience overvoltage stress, preserving measurement integrity. |
| LED Lighting Driver Protection | Automotive CAN Transceiver Protection |
Use Scenario: Safeguarding constant-current LED drivers in commercial vehicle lighting against inductive kickback from relay-controlled loads. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb flyback energy from solenoid or relay coils. Use Value: 600W peak power rating handles repetitive 10/1000µs surges up to 14.6A without degradation, extending driver lifespan. |
Use Scenario: Protecting high-speed CAN FD transceivers (e.g., TJA1044) from ESD and coupled transients on vehicle bus lines. IC Role / Device Role / Timing Role: Secondary-level TVS placed after common-mode choke, upstream of transceiver's differential pins. Use Value: Low 24V VWM avoids false triggering during normal CAN recessive/idle states while clamping ESD to <43V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24A | Bidirectional variant; same VWM (24V), but symmetric clamping (VC = 38.9V @ 16.0A); higher IPP but lower PPK (400W). | Required where bidirectional protection is needed (e.g., AC-coupled data lines); not suitable for DC-biased 24V rails without polarity reversal risk. | Select SMAJ24A only if bipolar clamping is explicitly required; SMBJ24H provides tighter unidirectional control for DC power rails. |
| ON Semiconductor SMCJ24A | Same DO-214AB (SMC) package; higher PPK (1500W), larger footprint; VWM = 24V, VC = 38.9V @ 38.9A. | Used where higher surge energy capacity is needed (e.g., main battery feed); incompatible with SMB footprint due to larger case size. | Choose SMCJ24A only when board space allows DO-214AB and 1500W rating is mandatory; SMBJ24H fits compact SMB layouts with verified 600W capability. |
Compared with SMAJ24A and SMCJ24A, the SMBJ24H delivers optimal balance of AEC-Q101 compliance, DO-214AA footprint compatibility, and 600W clamping performance for space-constrained 24V automotive power nodes - without over-specifying package size or sacrificing unidirectional precision.
Availability
SMBJ24H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, LED lighting drivers, and CAN transceiver protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ24H 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, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive systems, emphasizing robustness, automated assembly readiness, and ISO 7637-2 immunity - targeting ECU, body electronics, and lighting applications.
FAQ
What is the clamping voltage of SMBJ24H at its rated peak pulse current?
The SMBJ24H clamps to a maximum of 43.0 V when subjected to its specified peak pulse current of 14.6 A (10/1000 µs waveform). This value is measured under standardized test conditions per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream 36V-rated components in 24V systems. The SMBJ24H maintains this clamping performance across its qualified temperature range.
Is SMBJ24H suitable for bidirectional signal line protection?
No, SMBJ24H is a unidirectional TVS diode and must be used with correct polarity - cathode tied to ground or reference plane. For bidirectional protection (e.g., RS-485, USB, or AC-coupled lines), a bipolar variant such as SMBJ24AH or SMBJ24CH is required. Using SMBJ24H on bidirectional lines risks forward conduction during negative transients, compromising protection integrity.
Does SMBJ24H meet automotive qualification standards?
Yes, SMBJ24H is AEC-Q101 qualified and tested per ISO 7637-2 for Pulse 1, 2a, 2b, 3a, and 3b transient immunity. It also satisfies JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and RoHS/halogen-free requirements - making it suitable for under-hood and chassis-mounted automotive electronics.
What is the maximum leakage current of SMBJ24H at its working voltage?
At its 24 V working stand-off voltage (VWM), the SMBJ24H exhibits a maximum blocking leakage current (ID) of 1 µA at 25°C. This ultra-low leakage preserves system standby power budgets in always-on automotive modules such as telematics or gateway ECUs, and remains stable across its -55°C to +150°C operating junction temperature range.
Can SMBJ24H be used in place of SMBJ24AH?
No - SMBJ24H and SMBJ24AH are distinct variants: SMBJ24H has a VBR range of 26.7–32.6 V, while SMBJ24AH has a tighter 26.7–29.5 V range and lower clamping voltage (38.9 V vs. 43.0 V). Substituting SMBJ24H for SMBJ24AH may result in higher clamping during transients and reduced protection margin for sensitive downstream ICs.
SMBJ24H 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 43V
- Current - Peak Pulse (10/1000µs):
- 14.6A
- 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)
SMBJ24H FAQ
1.How can I place an order for SMBJ24H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ24H 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 SMBJ24H reliable?
The price and inventory of SMBJ24H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ24H is usually 5 days.
3.What payment methods are accepted for SMBJ24H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ24H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ24H?
SMBJ24H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ24H 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 SMBJ24H?
For technical support, including SMBJ24H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ24H requirements.
6.How does Aetrix verify that SMBJ24H is sourced from the original manufacturer or authorized distributors?
All SMBJ24H 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 SMBJ24H meets industry standards.
7.What is the process for return or replacement of SMBJ24H?
All SMBJ24H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ24H, 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 SMBJ24H part is unused and in its original packaging.
Return procedure for SMBJ24H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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