My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ43AH
- Part No.:
- SMBJ43AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43AH.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,279
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ43AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 43V working stand-off voltage (VWM), and 69.4V maximum clamping voltage (VC@IPP) at 9.0A peak impulse current - designed for automotive-grade ESD and load-dump protection in power supply rails and I/O interfaces.
For engineers reviewing the SMBJ43AH datasheet, SMBJ43AH pinout, SMBJ43AH application, or SMBJ43AH equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, ISO 7637-2 compliance, thermal resistance data, and real-world protection use cases - all confirmed against Taiwan Semiconductor's official SMBJH Series datasheet (Rev. A2102).
Technical Context
The SMBJ43AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response to transients and leakage current <1μA at VWM. Its breakdown voltage is specified at 47.8–52.8V (IT = 1mA), ensuring reliable turn-on before system-level damage occurs under fast-rising surges.
Thermally, it features RθJC = 10°C/W and RθJA = 55°C/W, supporting sustained operation up to TJ = +150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - critical for reflow-compatible automated assembly in automotive and industrial PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR min/max | 47.8 V / 52.8 V @ IT = 1 mA - Tight breakdown window ensures predictable turn-on across production lots. |
| VC@IPP | 69.4 V @ 9.0 A (10/1000 µs) - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 1/2a/2b/3a/3b events. |
| PPK | 600 W - Peak pulse power rating determines survivability against high-energy transients like load dump. |
| IPP | 9.0 A - Peak surge current capacity directly maps to system-level surge test compliance (e.g., 10/1000 µs waveform). |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments without derating penalties. |
| RθJA | 55 °C/W - Thermal resistance informs board layout requirements (e.g., copper area, via count) for thermal management. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; polarity indicated by molded cathode band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; forms clamping loop with cathode. |
| Cathode | Protected line input | Connected to protected signal/power rail; conducts surge current to anode during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables use in ADAS, body control, and powertrain modules. |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery connection/disconnection), and Pulse 3a/3b (switching transients) without degradation. |
| Fast response time <1 ps | Clamps transients before propagation into sensitive analog/digital circuitry - critical for protecting CAN/LIN transceivers and microcontrollers. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives; supports >1000 thermal cycles. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive - required for global automotive OEM sourcing and end-of-life recycling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp surges above 43V while maintaining normal operation below VWM. Use Value: Limits peak rail voltage to ≤69.4V during 600W transients, preventing damage to LDOs, MCUs, and CAN transceivers downstream. |
Use Scenario: 24V industrial PLC analog input channels subject to ESD (IEC 61000-4-2) and cable discharge events. IC Role / Device Role / Timing Role: Front-end protection device on signal line, shunting transient energy before reaching precision op-amps or ADC front-ends. Use Value: Sub-1ps response ensures clamping initiates before ESD pulse edge reaches sensitive nodes; <1μA leakage preserves signal integrity at DC. |
| LED Driver Overvoltage Clamp | Automotive LIN Bus Line Protection |
Use Scenario: Constant-current LED drivers in vehicle lighting systems subjected to inductive switching spikes from relay coils or solenoids. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb flyback energy and prevent MOSFET gate oxide failure. Use Value: 600W rating handles repetitive 10/1000µs pulses from inductive loads; 43V VWM avoids false triggering during nominal 36V peak supply conditions. |
Use Scenario: LIN transceiver lines in door modules or seat controllers exposed to board-level ESD and wiring harness coupling. IC Role / Device Role / Timing Role: Bidirectional protection not applicable - SMBJ43AH used in unidirectional configuration on LIN bus VBAT-referenced side. Use Value: Clamps negative-going transients to ground while allowing normal LIN signaling (0–12V); AEC-Q101 qualification ensures lifetime reliability in vibration-prone locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ43A | VC = 69.4V @ 9.0A (same), but VBR = 47.8–52.8V (identical range); RθJA = 60°C/W vs. SMBJ43AH's 55°C/W. | Same ISO 7637-2 compliance; slightly higher thermal resistance requires larger copper pour for equivalent thermal performance. | Select SMAJ43A only if Littelfuse supply chain alignment or dual-sourcing mandates override thermal layout constraints. |
| ON Semiconductor SMCJ43A | VC = 69.4V @ 9.0A (same), but package is DO-214AB (SMC); 2.5× larger footprint and 1.5× higher RθJA (70°C/W). | Not suitable for space-constrained SMB footprints; requires PCB redesign; higher thermal resistance reduces power handling in compact layouts. | Choose SMCJ43A only when higher surge margin (1500W) is needed and board area permits DO-214AB placement. |
Compared with SMAJ43A and SMCJ43A, the SMBJ43AH offers identical clamping performance in the smallest standard footprint (DO-214AA), lowest thermal resistance among 600W SMB-class TVS diodes, and direct AEC-Q101 qualification - making it optimal for automotive PCBs where space, thermal headroom, and qualification traceability are jointly constrained.
Availability
SMBJ43AH is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and LED driver overvoltage clamping requiring stable component supply, full AEC-Q101 documentation, and ISO 7637-2 compliance verification.
Supply support for SMBJ43AH 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 distribution and AEC-Q101 validation capabilities.
The SMBJH Series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, ISO 7637-2 immunity, and surface-mount compatibility for high-volume automated assembly.
FAQ
What is the clamping voltage of SMBJ43AH and how is it measured?
The SMBJ43AH has a maximum clamping voltage (VC) of 69.4 V, measured at a peak impulse current (IPP) of 9.0 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across temperature and production lots per Taiwan Semiconductor's SMBJH Series datasheet Rev. A2102, and defines the upper voltage limit imposed on protected circuits during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ43AH suitable for bidirectional transient protection?
No, SMBJ43AH is a unidirectional TVS diode intended for DC-biased lines such as power rails or single-polarity signal paths. Its cathode-anode polarity must be oriented with cathode toward the protected line. For bidirectional protection (e.g., AC lines or differential buses), Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes - the SMBJ43AH does not meet bipolar electrical specifications and will not clamp negative transients.
Does SMBJ43AH meet automotive qualification standards?
Yes, SMBJ43AH is explicitly AEC-Q101 qualified per the manufacturer's documentation and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. It also complies with JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for lead-free reflow assembly and under-hood automotive applications.
What is the leakage current specification for SMBJ43AH at its working voltage?
The SMBJ43AH exhibits a maximum blocking leakage current (ID) of 1 µA at its rated working stand-off voltage (VWM) of 43 V, tested at TA = 25°C. This ultra-low leakage ensures minimal power loss and no interference with high-impedance sensing circuits or battery-powered systems - a key advantage over higher-leakage alternatives in always-on automotive modules.
How does the SMBJ43AH thermal performance compare to similar 600W TVS diodes?
The SMBJ43AH achieves RθJA = 55°C/W and RθJC = 10°C/W - among the lowest thermal resistances in the DO-214AA (SMB) package class. Compared to alternatives like SMAJ43A (RθJA = 60°C/W) or SMCJ43A (RθJA = 70°C/W), this enables higher sustained surge duty cycles and relaxed PCB copper requirements, especially in thermally constrained automotive modules.
SMBJ43AH 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 9A
- 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)
SMBJ43AH FAQ
1.How can I place an order for SMBJ43AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43AH 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 SMBJ43AH reliable?
The price and inventory of SMBJ43AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43AH is usually 5 days.
3.What payment methods are accepted for SMBJ43AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43AH?
SMBJ43AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43AH 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 SMBJ43AH?
For technical support, including SMBJ43AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43AH requirements.
6.How does Aetrix verify that SMBJ43AH is sourced from the original manufacturer or authorized distributors?
All SMBJ43AH 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 SMBJ43AH meets industry standards.
7.What is the process for return or replacement of SMBJ43AH?
All SMBJ43AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43AH, 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 SMBJ43AH part is unused and in its original packaging.
Return procedure for SMBJ43AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43AH Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
