My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ14AH
- Part No.:
- SMBJ14AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ14AH.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,374
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ14AH from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 14 V working stand-off voltage (VWM), 15.6–17.2 V breakdown voltage (VBR), and 23.2 V maximum clamping voltage (VC) at 27 A peak pulse current - designed for automotive-grade ESD and load-dump protection in power supply rails and signal lines.
For engineers reviewing the SMBJ14AH datasheet, SMBJ14AH pinout, SMBJ14AH application, or SMBJ14AH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, ISO 7637-2 compliance, thermal resistance data, and real-world protection use cases - all aligned to Taiwan Semiconductor's official SMBJH Series specification A2102.
Technical Context
The SMBJ14AH operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its 15.6–17.2 V breakdown threshold under 1 mA test current. It clamps transients to ≤23.2 V at 27 A (10/1000 µs waveform), with <1 µA leakage above 14 V and <1.0 ps response time - enabling robust immunity against EFT, ISO 7637-2 Pulse 1/2a/2b/3a/3b, and automotive load dump events.
Thermally, it features 10 °C/W junction-to-case (RθJC) and 55 °C/W junction-to-ambient (RθJA) resistance, rated for continuous operation from –55 °C to +150 °C, and qualified per AEC-Q101 with JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC rail margin. |
| VBR min/max | 15.6 V / 17.2 V - Breakdown occurs within this range at 1 mA; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPP | 23.2 V at 27 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPK | 600 W - Peak pulse power handling (10/1000 µs); supports high-energy automotive transients without failure. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; negligible power loss and minimal impact on high-impedance sensing nodes. |
| TJ max | +150 °C - Maximum junction temperature; enables placement near hot components in engine control units or power modules. |
Pinout & Package
DO-214AA (SMB) surface-mount package: cathode-banded end denotes cathode terminal; matte tin-plated leads compliant with J-STD-002 solderability; UL 94V-0 molding compound; 0.090 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse voltage reference node | Connected to system ground or low-side return path; establishes reference for clamping action. |
| Cathode | Reverse voltage input / clamping output node | Connected to protected line (e.g., 12 V rail); conducts surge current to ground when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood applications including temperature cycling, humidity bias, and mechanical shock testing. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) immunity requirements. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal stress and humidity exposure. |
| Fast response time | <1.0 ps - Enables suppression before sensitive ICs experience overvoltage damage during nanosecond-scale ESD events. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (up to 60 V, 400 ms) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach LDOs, microcontrollers, or CAN transceivers. Use Value: Limits rail voltage to ≤23.2 V during 27 A transients, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: 4–20 mA current-loop sensors in factory automation subject to cable-induced EFT bursts. IC Role / Device Role / Timing Role: TVS mounted across sensor input terminals to shunt fast transients (<1 ns rise) before reaching precision ADC front-end. Use Value: Sub-µA leakage preserves loop accuracy; 23.2 V clamping protects 24 V-rated op-amps and isolators without derating. |
| LED Driver Output Protection | Automotive LIN Bus Line Protection |
Use Scenario: Constant-current LED drivers in headlamps experiencing inductive kickback from relay switching. IC Role / Device Role / Timing Role: SMBJ14AH placed anode-to-ground, cathode-to-driver output to absorb reverse energy from inductive loads. Use Value: Withstands 100 A IFSM surge (8.3 ms half-sine), enabling reliable protection without degradation after repeated switching cycles. | Use Scenario: LIN transceiver nodes in door modules subjected to ESD (±8 kV contact) and conducted noise on shared harnesses. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMBJ14AH used in unidirectional configuration on VBAT-referenced LIN supply line. Use Value: 14 V VWM allows operation across cold-crank (6.5 V) to load-dump (18 V) conditions while maintaining clamping integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A | Same VWM (14 V), but VBR min/max = 15.6–18.5 V and VC = 24.4 V at 24.4 A - higher clamping voltage and lower surge current rating. | Less effective clamping margin for 3.3 V or 5 V logic interfaces; suitable only where higher VC is acceptable. | Select SMBJ14A only if cost sensitivity outweighs clamping performance; SMBJ14AH provides tighter VBR tolerance and lower VC. |
| SMAJ14A | Lower PPK (400 W), same VWM (14 V), VBR = 15.6–18.5 V, VC = 24.4 V at 16.3 A - smaller SMA package with reduced thermal mass and surge capacity. | Not recommended for automotive load dump; limited to low-energy ESD/EFT in consumer or industrial PCBs. | Choose SMAJ14A only for space-constrained non-automotive designs with <400 W surge requirements. |
Compared with SMBJ14A and SMAJ14A, SMBJ14AH delivers superior clamping (23.2 V vs. ≥24.4 V), higher surge current (27 A vs. ≤24.4 A), and full AEC-Q101/ISO 7637-2 validation - making it the preferred choice for automotive power rail and industrial interface protection where reliability and margin are critical.
Availability
SMBJ14AH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, LED lighting drivers, and LIN bus power conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMBJ14AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMBJH Series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting 12 V/24 V systems requiring ISO 7637-2 Pulse 1–3 immunity and high-reliability glass-passivated junction construction.
FAQ
What is the clamping voltage of SMBJ14AH and how is it measured?
The SMBJ14AH has a maximum clamping voltage (VC) of 23.2 V, measured at 27 A peak pulse current using the standardized 10/1000 µs double-exponential waveform per ANSI/IEEE C62.35. This value represents the highest voltage the device allows across its terminals during a transient event, directly protecting downstream components from overvoltage stress. The SMBJ14AH achieves this clamping performance while maintaining sub-µA leakage at its 14 V working stand-off voltage.
Is SMBJ14AH suitable for bidirectional transient protection?
No, SMBJ14AH is a unidirectional TVS diode intended for DC-biased lines such as automotive 12 V power rails. For bidirectional protection (e.g., AC signal lines or data buses), Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes (e.g., SMBJ14CH). Using SMBJ14AH in reverse-biased AC applications would result in forward conduction during negative half-cycles, potentially damaging the device or circuit. Always verify polarity marking and application topology before deployment.
Does SMBJ14AH meet automotive qualification standards?
Yes, SMBJ14AH is AEC-Q101 qualified and meets ISO 7637-2 test requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (supply interruption and coupling), and Pulse 3a/3b (electrical fast transients). It also complies with JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and RoHS/halogen-free standards - confirming suitability for under-hood and body-control module applications.
What is the thermal resistance of SMBJ14AH and why does it matter?
SMBJ14AH has a junction-to-case thermal resistance (RθJC) of 10 °C/W and junction-to-ambient resistance (RθJA) of 55 °C/W. These values determine how effectively heat generated during surge events is dissipated. Lower RθJC enables efficient transfer to a heatsink or copper pour, while RθJA informs board-level layout - e.g., ≥1 cm² 2-oz copper pad reduces effective RθJA, preventing thermal runaway during repetitive transients. Both values are validated per JEDEC standards.
How does SMBJ14AH compare to SMBJ14H in terms of breakdown voltage tolerance?
SMBJ14AH has a tighter breakdown voltage (VBR) tolerance: 15.6–17.2 V (±5.7% around 16.4 V nominal), versus SMBJ14H's wider 15.6–19.1 V (±11.2%). This narrower spread improves design predictability - especially in systems where precise clamping onset is critical, such as protecting 16 V-rated regulators or avoiding false triggering near rail limits. The "A" grade reflects tighter process control and binning, confirmed in Taiwan Semiconductor's A2102 datasheet revision.
SMBJ14AH 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 27A
- 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)
SMBJ14AH FAQ
1.How can I place an order for SMBJ14AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ14AH 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 SMBJ14AH reliable?
The price and inventory of SMBJ14AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ14AH is usually 5 days.
3.What payment methods are accepted for SMBJ14AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ14AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ14AH?
SMBJ14AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ14AH 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 SMBJ14AH?
For technical support, including SMBJ14AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ14AH requirements.
6.How does Aetrix verify that SMBJ14AH is sourced from the original manufacturer or authorized distributors?
All SMBJ14AH 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 SMBJ14AH meets industry standards.
7.What is the process for return or replacement of SMBJ14AH?
All SMBJ14AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ14AH, 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 SMBJ14AH part is unused and in its original packaging.
Return procedure for SMBJ14AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ14AH 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…
