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Taiwan Semiconductor Corporation SMF48AH
- Part No.:
- SMF48AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF48AH.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:6,937
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Product details
Overview
SMF48AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SOD-123W package, designed for automotive-grade ESD and surge protection. It features a 48 V working stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR), 77.4 V clamping voltage (VC) at 2.6 A peak pulse current, and 200 W peak pulse power (10/1000 µs). 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 SMF48AH datasheet, SMF48AH pinout, SMF48AH application, or SMF48AH equivalent, key selection criteria include clamping performance under 10/1000 µs transients, leakage current <1 µA above 10 V, junction temperature range (−55°C to +175°C), and compliance with automotive EMC standards including ISO 7637-2 and AEC-Q101 reliability testing.
Technical Context
The SMF48AH operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its breakdown threshold (min 53.3 V, max 58.9 V at 1 mA test current). Its low clamping ratio (VC/VBR ≈ 1.33) ensures effective overvoltage limiting during fast transients such as EFT or load dump.
Thermal design is supported by RθJL = 33°C/W and RθJA = 100°C/W on a 5 mm × 5 mm Cu pad PCB, enabling reliable operation up to TJ = 175°C. It uses glass-passivated junction technology for stable leakage (<1 µA @ 48 V) and long-term reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 53.3 / 58.9 V @ 1 mA - Ensures predictable turn-on margin above VWM for robust noise immunity |
| VC @ IPPM | 77.4 V @ 2.6 A (10/1000 µs) - Limits downstream IC voltage stress during ISO 7637-2 Pulse 1/2a/2b events |
| PPPM | 200 W (10/1000 µs) - Supports high-energy automotive transients without thermal runaway |
| IR @ VWM | <1 µA - Minimizes standby power loss and avoids false triggering in low-power sensor circuits |
| TJ Range | −55°C to +175°C - Enables deployment in engine bay, transmission control, and under-hood modules |
Pinout & Package
Package: SOD-123W - Surface-mount, low-profile (1.7 mm × 3.7 mm × 1.2 mm), matte tin-plated leads, UL 94V-0 molding compound, cathode band polarity indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to ground or low-impedance return path; enables unidirectional clamping from cathode to anode |
| Cathode | Protected line input / high-side connection | Connected to signal/power line requiring protection; clamps transients to anode when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements (HTOL, TC, UHAST, etc.) |
| Glass-passivated junction | Stable VBR and IR over lifetime; resistant to humidity and contamination in under-hood environments |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (EFT) waveforms |
| SOD-123W footprint | Enables automated placement and reflow compatibility; compatible with standard 0805-class pick-and-place equipment |
Applications
| Automotive Body Control Module (BCM) | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protecting LIN bus interface and power inputs in BCM against battery load dump and alternator ripple. IC Role / Device Role: Unidirectional TVS placed between supply rail and ground to clamp transients before they reach MCU and driver ICs. Use Value: Prevents latch-up or permanent damage to 5 V/12 V logic and analog circuitry during ISO 7637-2 Pulse 2b (12 V system) events. | Use Scenario: Safeguarding constant-current LED drivers from inductive kickback during PWM dimming and thermal shutdown cycles. IC Role / Device Role: Clamping device across LED string input to absorb energy from flyback diodes and parasitic inductance. Use Value: Maintains LED driver uptime by limiting voltage spikes to ≤77.4 V, well below typical 80 V MOSFET drain ratings. |
| Infotainment System USB Port | Engine Control Unit (ECU) Sensor Interface |
Use Scenario: ESD protection for USB 2.0 data lines and VBUS in vehicle infotainment head units exposed to human contact. IC Role / Device Role: Low-capacitance TVS on VBUS line (not signal lines) to handle ±15 kV contact discharge per IEC 61000-4-2. Use Value: Prevents VBUS overvoltage from propagating to USB controller ICs while maintaining <1 µA leakage for low-power suspend mode. | Use Scenario: Protecting analog inputs of pressure, temperature, and oxygen sensors connected to ECU against cranking transients and relay coil spikes. IC Role / Device Role: Standoff protector on 5 V sensor supply rail, placed upstream of LDO regulators. Use Value: Ensures sensor signal integrity by limiting rail collapse to ≤77.4 V during 100 V/50 ms load dump pulses per ISO 7637-2 Pulse 5a. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A | Same VWM (48 V), but lower PPPM (400 W), larger SMA package (4.5 mm × 2.7 mm), higher VC (77 V) | Higher power handling but less space-constrained; not AEC-Q101 qualified | Preferred where board area allows and automotive qualification is not required |
| P6SMB48A | Same VWM (48 V), same SOD-123W-equivalent SMB package, but higher VC (77.4 V), no AEC-Q101 or ISO 7637-2 documentation | General industrial use only; lacks automotive test evidence and moisture sensitivity level 1 rating | Acceptable for non-automotive designs needing cost-effective TVS with identical clamping |
Compared with SMAJ48A and P6SMB48A, the SMF48AH delivers verified AEC-Q101 reliability, documented ISO 7637-2 immunity, and J-STD-020 Level 1 moisture resistance-critical for automotive production programs where field failure risk must be minimized.
Availability
SMF48AH is available at Aetrix Electronics and suitable for automotive body electronics, LED lighting systems, infotainment interfaces, and engine management subsystems requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMF48AH 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 for automotive, industrial, and consumer markets.
The SMF48AH belongs to TSC's AEC-Q101-qualified SMF-AH series, engineered specifically for automotive-grade transient suppression in 12 V and 24 V systems with stringent ISO 7637-2 compliance and high-temperature reliability.
FAQ
What is the maximum clamping voltage of the SMF48AH under standard test conditions?
The SMF48AH has a maximum clamping voltage (VC) of 77.4 V when subjected to a 10/1000 µs peak pulse current of 2.6 A. This value is measured per JEDEC standards and reflects worst-case voltage seen by protected circuitry during transient events like ISO 7637-2 Pulse 1 or Pulse 2b. The clamping performance is guaranteed across the full operating temperature range (−55°C to +175°C).
Is the SMF48AH suitable for 24 V automotive systems?
Yes, the SMF48AH is explicitly rated for 24 V nominal systems. Its 48 V working stand-off voltage (VWM) provides sufficient margin above 24 V rail transients, and its 53.3–58.9 V breakdown range ensures reliable activation during load dump events exceeding 100 V. It meets ISO 7637-2 Pulse 5a requirements and is AEC-Q101 qualified for under-hood deployment.
Does the SMF48AH have polarity marking, and how is it identified?
Yes, the SMF48AH uses a cathode band to indicate polarity, consistent with SOD-123W mechanical drawings. The band is located adjacent to the cathode terminal and aligns with the marking code "2W048" laser-etched on the device body. Correct orientation is critical: cathode connects to the protected line, anode to ground or low-impedance return path for unidirectional clamping action.
What is the thermal resistance from junction to lead (RθJL) for the SMF48AH?
The SMF48AH has a typical junction-to-lead thermal resistance (RθJL) of 33°C/W when mounted on a 5 mm × 5 mm copper pad PCB. This value supports thermal management in high-density layouts and enables sustained operation at TJ = 175°C. Derating curves in the datasheet confirm ≥80% power capability at TL = 100°C.
How does the SMF48AH compare to generic TVS diodes in terms of automotive compliance?
The SMF48AH is AEC-Q101 qualified and fully documented for ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity-unlike generic TVS diodes that lack test reports or qualification records. It also carries J-STD-020 Level 1 moisture sensitivity and halogen-free certification per IEC 61249-2-21, making it suitable for automotive production without additional validation overhead.
SMF48AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-123W
- Series:
- SMF
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 2.6A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF48AH FAQ
1.How can I place an order for SMF48AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF48AH 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 SMF48AH reliable?
The price and inventory of SMF48AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF48AH is usually 5 days.
3.What payment methods are accepted for SMF48AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF48AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF48AH?
SMF48AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF48AH 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 SMF48AH?
For technical support, including SMF48AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF48AH requirements.
6.How does Aetrix verify that SMF48AH is sourced from the original manufacturer or authorized distributors?
All SMF48AH 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 SMF48AH meets industry standards.
7.What is the process for return or replacement of SMF48AH?
All SMF48AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF48AH, 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 SMF48AH part is unused and in its original packaging.
Return procedure for SMF48AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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