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Taiwan Semiconductor Corporation SMBJ7.5AH
- Part No.:
- SMBJ7.5AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ7.5AH.pdf
- Description:
- 600W, 8.8V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,573
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Product details
Overview
SMBJ7.5AH from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 7.5V working stand-off voltage (VWM), 8.33–9.21V breakdown voltage (VBR), 12.9V clamping voltage (VC) at 100A peak pulse current, and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SMBJ7.5AH datasheet, SMBJ7.5AH pinout, SMBJ7.5AH application, or SMBJ7.5AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤1µA at 7.5V, and thermal resistance (RθJA = 55°C/W) for PCB-level thermal design in space-constrained automotive modules.
Technical Context
The SMBJ7.5AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response to fast transients. Its 12.9V clamping voltage at 100A IPP ensures robust protection of 5V–12V logic interfaces without overvoltage stress on downstream ICs.
Rated for -55°C to +150°C junction temperature and qualified to AEC-Q101, it supports automotive powertrain and body electronics where reliability under thermal cycling and humidity exposure is critical. The DO-214AA package provides 3W steady-state power dissipation and meets JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before conduction begins; sets system-level overvoltage trip threshold for 5V/12V rail protection. |
| VBR min/max | 8.33 / 9.21 V @ 1 mA - Confirmed breakdown range ensures predictable turn-on during transients without premature leakage. |
| VC @ IPP | 12.9 V @ 100 A - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 1 (inductive load dump) events. |
| PPK | 600 W - Peak pulse power rating for 10/1000 µs waveform defines single-event surge energy handling capability. |
| ID @ VWM | <1 µA - Ultra-low blocking leakage preserves battery life in always-on automotive modules (e.g., CAN nodes, door controllers). |
| TJ max | +150 °C - Enables placement near heat sources (e.g., power converters, motor drivers) without derating concerns. |
| RθJA | 55 °C/W - Thermal resistance determines required copper area for 3W steady-state dissipation in compact PCB layouts. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Weight: 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; establishes reference for clamping action during positive transients. |
| Cathode | Protected line input | Connected to protected signal/rail (e.g., 12V supply, LIN bus); conducts avalanche current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body control modules, and ADAS sensors requiring zero-failure reliability. |
| Glass-passivated junction | Ensures stable VBR and low leakage across temperature (-55°C to +150°C) and humidity exposure per J-STD-020 MSL Level 1. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) immunity requirements. |
| Sub-1 ps response time | Clamps transients before sensitive CMOS inputs reach destructive voltage levels-critical for protecting CAN, LIN, and sensor interfaces. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained automotive supply chains. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V power rails in body control modules against load dump transients per ISO 7637-2 Pulse 1. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between fused 12V input and DC-DC converter input. Use Value: Limits voltage to ≤12.9V during 100A surges, preventing overvoltage damage to buck controller ICs and ensuring system reset integrity. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Low-leakage (<1 µA) TVS on 5V sensor supply line adjacent to ADC front-end. Use Value: Maintains signal integrity by clamping transients below 12.9V while adding negligible offset error due to ultra-low ID at 7.5V. |
| Automotive Lighting Control | Automotive LIN Bus Protection |
Use Scenario: Safeguarding LED driver ICs in headlamp modules from inductive switching spikes generated by high-current MOSFETs. IC Role / Device Role / Timing Role: Fast-response (sub-1ps) TVS on switched 12V supply rail feeding LED current regulators. Use Value: Prevents latch-up or gate oxide rupture in driver ICs by clamping spikes within 12.9V, preserving PWM dimming accuracy. |
Use Scenario: Protecting LIN transceiver pins (e.g., TJA1020) from ESD and electrical fast transients in door module networks. IC Role / Device Role / Timing Role: Unidirectional TVS on LIN bus line (VBAT-supplied side) with cathode tied to LIN signal. Use Value: Ensures <1 µA leakage at 7.5V to avoid LIN bias current errors, while clamping ESD pulses to safe levels for transceiver I/O. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ7.5A | Same VWM (7.5V), but lower VBR range (7.88–8.71V) and higher VC (13.6V @ 100A); no AEC-Q101 qualification. | Limited to industrial/commercial use; not validated for automotive thermal cycling or humidity testing. | Select SMBJ7.5A only for cost-sensitive non-automotive designs where AEC-Q101 is not mandated. |
| SAC7.5 | Same VWM (7.5V), but lower PPK (400W), higher VC (15.0V @ 50A), and different DO-214AC (SMC) package footprint. | Requires PCB layout change; suitable for lower-energy transients where 600W rating is unnecessary. | Choose SAC7.5 only when board space allows larger SMC package and surge energy is capped at 400W. |
Compared with SMBJ7.5A and SAC7.5, the SMBJ7.5AH delivers superior automotive-grade reliability via AEC-Q101 validation, tighter VBR tolerance (8.33–9.21V), lower clamping voltage (12.9V), and optimized DO-214AA footprint for high-density automotive PCBs-making it the preferred choice for safety-critical 12V rail protection.
Availability
SMBJ7.5AH is available at Aetrix Electronics and suitable for automotive power supply protection, industrial sensor interface hardening, and lighting control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMBJ7.5AH 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 automotive electronics, targeting robustness against ISO 7637-2 pulses and long-term reliability in harsh under-hood environments.
FAQ
What is the clamping voltage of SMBJ7.5AH and how does it protect downstream circuits?
The SMBJ7.5AH has a maximum clamping voltage (VC) of 12.9 V at 100 A peak pulse current (10/1000 µs waveform). This value defines the highest voltage imposed on the protected line during a surge event. By limiting transient overvoltages to ≤12.9 V, the SMBJ7.5AH prevents damage to downstream components such as microcontrollers, CAN transceivers, or power management ICs rated for 13.2 V absolute maximum, ensuring system-level robustness in automotive and industrial applications.
Is SMBJ7.5AH unidirectional or bidirectional, and how is polarity identified?
The SMBJ7.5AH is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix (e.g., SMBJ7.5CH would be bidirectional). Polarity is marked by a cathode band on the DO-214AA package body; the banded end connects to the protected line (cathode), while the unbanded end connects to ground (anode). This configuration enables suppression of positive transients only, making it ideal for 12V supply rail protection.
Does SMBJ7.5AH meet automotive qualification standards?
Yes, SMBJ7.5AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. It also complies with J-STD-020 moisture sensitivity level 1, JESD201 Class 2 whisker resistance, and RoHS/halogen-free directives-ensuring suitability for under-hood automotive modules including body control units, lighting systems, and sensor nodes.
What is the maximum leakage current of SMBJ7.5AH at its working voltage?
The SMBJ7.5AH exhibits a maximum blocking leakage current (ID) of 1 µA at its 7.5 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage preserves battery standby current in always-on automotive subsystems such as door modules and LIN networks, directly supporting low-power design goals without compromising surge protection capability.
How does the thermal performance of SMBJ7.5AH affect PCB layout decisions?
With a junction-to-ambient thermal resistance (RθJA) of 55°C/W, the SMBJ7.5AH requires adequate copper pour area around its pads to dissipate up to 3 W steady-state power. For reliable operation at full rating, designers should allocate ≥100 mm² of 2-oz copper connected to both terminals, especially in high-temperature environments like engine compartments-ensuring junction temperature remains within the -55°C to +150°C operational limit.
SMBJ7.5AH 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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 48A
- 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)
SMBJ7.5AH FAQ
1.How can I place an order for SMBJ7.5AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ7.5AH 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 SMBJ7.5AH reliable?
The price and inventory of SMBJ7.5AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ7.5AH is usually 5 days.
3.What payment methods are accepted for SMBJ7.5AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ7.5AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ7.5AH?
SMBJ7.5AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ7.5AH 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 SMBJ7.5AH?
For technical support, including SMBJ7.5AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ7.5AH requirements.
6.How does Aetrix verify that SMBJ7.5AH is sourced from the original manufacturer or authorized distributors?
All SMBJ7.5AH 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 SMBJ7.5AH meets industry standards.
7.What is the process for return or replacement of SMBJ7.5AH?
All SMBJ7.5AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ7.5AH, 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 SMBJ7.5AH part is unused and in its original packaging.
Return procedure for SMBJ7.5AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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