My Inquiry
My Account
Taiwan Semiconductor Corporation SS34FSH
- Part No.:
- SS34FSH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- SOD-128
- Datasheet:
-
SS34FSH.pdf
- Description:
- 3A, 40V, SCHOTTKY RECTIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:7,835
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SS34FSH from Taiwan Semiconductor is a 3A, 40V AEC-Q101-qualified Schottky barrier rectifier in SOD-128 package, featuring low forward voltage (0.47 V at 3.0A/25°C), 70A surge capability, 150°C max junction temperature, and moisture sensitivity level 1. It serves as a high-efficiency output rectifier in automotive-grade DC/DC converters.
For engineers reviewing the SS34FSH datasheet, SS34FSH pinout, SS34FSH application, or SS34FSH equivalent, key selection criteria include its 40V VRRM, 0.41–0.59V forward voltage range across operating conditions, thermal resistance (RθJL = 16°C/W), AEC-Q101 qualification, and SOD-128 surface-mount compatibility with automated placement.
Technical Context
The SS34FSH implements a single-die Schottky junction optimized for low conduction loss in high-frequency switching topologies. Its 40V reverse rating targets 12V–24V automotive and industrial DC/DC outputs where fast recovery and minimal reverse recovery charge are critical.
Thermal performance is defined by RθJL = 16°C/W and RθJA = 71°C/W on a 5mm × 5mm Cu pad, enabling sustained 3A operation up to 125°C ambient when properly mounted. Reverse leakage remains ≤200 µA at 25°C and ≤80 mA at 125°C under rated VR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; sets upper limit for input/output voltage differential in buck or flyback secondary-side rectification. |
| IF | 3 A - Continuous forward current rating; defines steady-state power delivery capacity without derating at TA ≤ 75°C. |
| VF | 0.47 V (max at 3.0A, 25°C) - Low conduction loss enables >92% efficiency in 12V-output SMPS at full load. |
| IFSM | 70 A - Non-repetitive surge current (8.3ms half-sine); supports inrush and transient overload handling in adapter and lighting applications. |
| TJMAX | 150 °C - Maximum junction temperature; allows operation in under-hood automotive environments with appropriate PCB thermal design. |
| RθJL | 16 °C/W - Junction-to-lead thermal resistance; enables direct heat transfer to PCB copper, reducing need for external heatsinking. |
| CJ | 172 pF - Junction capacitance at 1MHz/4V; contributes to low reverse recovery time (<10 ns), minimizing switching losses in >100kHz converters. |
Pinout & Package
SS34FSH uses the SOD-128 surface-mount package: molded UL 94V-0 compound, matte tin-plated leads, cathode indicated by band, weight ≈0.028g. Mounting requires 5mm × 5mm Cu pad per thermal test condition.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point under forward bias | Connected to lower-potential node (e.g., switch node in synchronous buck, transformer center-tap in full-wave); must route with low-inductance path. |
| Cathode | Current exit point under forward bias | Connected to output rail; polarity marked by visible band; ties directly to output capacitor and feedback network reference. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics per stress test requirements including HTOL, TC, and HAST. |
| Low VF at high IF | 0.47 V max at 3.0A/25°C reduces conduction loss by ≥35% vs. comparable 40V Si diodes, lowering thermal load in compact adapters. |
| High IFSM | 70A surge rating supports 10× nominal current for 8.3ms, enabling robustness against output short-circuit transients in lighting drivers. |
| SOD-128 mechanical robustness | Meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity-enables reflow without baking or special handling. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU-supports environmental compliance in global OEM BOMs. |
Applications
| Automotive On-Board DC/DC Converter | Industrial Switching Mode Power Supply |
|---|---|
|
Use Scenario: 12V-to-5V/3.3V step-down conversion in ADAS camera modules and infotainment ECUs. IC Role / Device Role / Timing Role: Output rectifier in synchronous buck converter secondary side, conducting during low-side FET on-time. Use Value: 0.47V VF minimizes power loss at 3A load, enabling >93% efficiency and eliminating need for forced air cooling in sealed enclosures. |
Use Scenario: Secondary-side rectification in 24V-input industrial SMPS powering PLC I/O modules. IC Role / Device Role / Timing Role: Uncontrolled rectifier replacing fast-recovery diodes in flyback or forward converter outputs. Use Value: 172pF junction capacitance and <10ns recovery reduce EMI generation and improve light-load regulation stability versus silicon alternatives. |
| USB-C PD Adapter Output Stage | LED Driver for Commercial Lighting |
|
Use Scenario: 20V-output rectification in compact 65W USB-C power adapters with high-density layout. IC Role / Device Role / Timing Role: High-frequency output rectifier synchronized with GaN FET switching at 200–500kHz. Use Value: SOD-128 footprint and 0.028g mass support automated pick-and-place; low VF maintains efficiency above 90% across 0–100% load range. |
Use Scenario: Constant-current LED string rectification in outdoor streetlight drivers exposed to ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: AC-input bridge leg or DC-link freewheeling diode in buck-derived LED current regulators. Use Value: 150°C TJMAX and 80mA IR at 125°C ensure reliability in thermally constrained aluminum-core PCBs without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-3EYH04-M3/5BT | Same 40V VRRM, 3A IF, but TO-277 package (larger footprint, higher RθJA = 90°C/W) | Requires PCB redesign due to different outline and thermal pad; not suitable for space-constrained SOD-128 layouts | Select when higher surge margin (100A IFSM) outweighs board area penalty and thermal performance trade-off |
| ON Semiconductor SB340-E3/57T | 40V/3A Schottky in DO-214AA (SMB); VF = 0.55V max at 3A, no AEC-Q101 qualification | Lacks automotive qualification; higher VF increases conduction loss by ~17% at full load | Acceptable for cost-sensitive industrial adapters where AEC-Q101 is not mandated and thermal headroom exists |
Compared with VS-3EYH04-M3/5BT and SB340-E3/57T, the SS34FSH delivers superior thermal performance (RθJL = 16°C/W), automotive qualification, and smallest footprint-making it optimal for high-density, high-reliability 40V rectification where board space and qualification are critical.
Availability
SS34FSH is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial switching mode power supplies, and commercial LED lighting systems requiring stable component supply, AEC-Q101 compliance, and SOD-128 surface-mount compatibility.
Supply support for SS34FSH 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 power devices, protection components, and optoelectronics for industrial and automotive markets.
The SS34FSH belongs to TSC's FSH-series Schottky rectifier family, engineered specifically for high-efficiency, high-reliability secondary-side rectification in automotive and industrial power conversion where low VF, AEC-Q101 compliance, and SOD-128 manufacturability are mandatory.
FAQ
What is the maximum junction temperature rating for SS34FSH?
The SS34FSH has a maximum junction temperature (TJMAX) of 150°C, verified per absolute maximum ratings in the official datasheet. This rating enables reliable operation in under-hood automotive environments and enclosed industrial power supplies when mounted on a 5mm × 5mm copper pad. Derating begins above 75°C ambient, and the SS34FSH must not exceed 150°C at the die under any steady-state or transient condition.
Is SS34FSH qualified for automotive applications?
Yes, the SS34FSH is explicitly AEC-Q101 qualified, as confirmed in the "FEATURES" section of the Taiwan Semiconductor datasheet. This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and highly accelerated stress test (HAST), making the SS34FSH suitable for automotive powertrain, body control, and ADAS subsystems where reliability under thermal and mechanical stress is required.
What is the forward voltage of SS34FSH at 3.0A and 125°C?
The SS34FSH exhibits a forward voltage of 0.41 V (typical) and 0.53 V (maximum) at 3.0A and 125°C junction temperature, per the "ELECTRICAL SPECIFICATIONS" table. This low VF at elevated temperature ensures stable efficiency in thermally demanding applications such as LED drivers and automotive DC/DC converters operating continuously at high ambient temperatures.
Does SS34FSH have a specified junction-to-ambient thermal resistance?
Yes, the SS34FSH has a junction-to-ambient thermal resistance (RθJA) of 71°C/W, measured on a standard 5mm × 5mm copper pad PCB per JEDEC test conditions. This value is critical for thermal design calculations and confirms that the SS34FSH can dissipate up to 3A continuously at ambient temperatures up to 75°C without exceeding its 150°C TJMAX, assuming proper PCB copper area and airflow.
What packaging and reel quantity is available for SS34FSH?
The SS34FSH is supplied in SOD-128 package on tape-and-reel format with 14,000 units per reel, as stated in the "ORDERING INFORMATION" section of the Taiwan Semiconductor datasheet. The marking code "34FSH" appears on the device body, and the package complies with J-STD-002 for solderability and J-STD-020 Level 1 for moisture sensitivity-eliminating bake requirements prior to reflow.
SS34FSH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-128
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 590 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 40 V
- Capacitance @ Vr, F:
- 54pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-128
- Operating Temperature - Junction:
- -55°C ~ 150°C
SS34FSH FAQ
1.How can I place an order for SS34FSH through Aetrix?
Please submit a Request for Quotation (RFQ) for SS34FSH 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 SS34FSH reliable?
The price and inventory of SS34FSH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SS34FSH is usually 5 days.
3.What payment methods are accepted for SS34FSH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SS34FSH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SS34FSH?
SS34FSH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SS34FSH 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 SS34FSH?
For technical support, including SS34FSH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SS34FSH requirements.
6.How does Aetrix verify that SS34FSH is sourced from the original manufacturer or authorized distributors?
All SS34FSH 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 SS34FSH meets industry standards.
7.What is the process for return or replacement of SS34FSH?
All SS34FSH units undergo pre-shipment inspection (PSI). If there is an issue with SS34FSH, 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 SS34FSH part is unused and in its original packaging.
Return procedure for SS34FSH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SS34FSH Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
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…
